25 June 2011, Volume 42 Issue S2
    

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    研究与开发
  • ;Zhou Ming
    . 2011, 42(S2): 1-0.
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  • ;;;
    . 2011, 42(S2): 2-0.
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    LaNiO3 thin films were deposited on Si (100) substrate by pulsed laser deposition(PLD)with different oxygen pressures. X-ray diffraction (XRD) analysis show that the LaNiO3 thin films have highly (100)-oriented by controlling oxygen pressures. Oxygen pressures have a great influence on the crystallinity of the LaNiO3 thin films,and the film has the best crystallineity when the oxygen pressure is 7.5 Pa, the stoichiometric ratio of La to Ni element go down as the growing of oxygen pressures, the smallest resistivity of the LaNiO3 thin films is 2.03ⅹ10-4Ω?㎝,it shows a good conductivity of metallic perovskite oxide;SEM and TEM analysis show that crystal grain of the film is columnar morphology, revealed smooth dense surfaces and very homogeneous grain distribution. Compacted and clearly well-defined grain size can also be observed. RMS of LaNiO3 films is 1.73 nm ,which could be acceptable for most of the possible applications of LaNiO3,for example as an electrode in ferroelectric(FE) thin films.
  • Di-Lun YANG; ;
    . 2011, 42(S2): 3-0.
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    By the novel Gas Bubble Liquor Membrane (GBLM) process the precursor nanoparticle of Ni0.7Zn0.3Fe2O4 ferrite was prepared with the coprecipitation reaction of aqueous solution of Zn2+, Ni2+ and Fe3+ with OH- in a gas bubble liquor membrane carried out, use of the aqueous solution of sodium stearate as the coating agent. The precursor was characterized by means of elemental analysis, FT-IR, SEM and XRD. The experimental results had indicated that the mole ratio of Zn2+, Ni2+ and Fe3+ in the substrate solution was kept accurately to the mole ratio in the precursor. Ni0.7Zn0.3Fe2O4 ferrites were obtained after the precursor was sintered at 300℃,400℃,500℃,600℃,700℃ or 800℃ respectively. The ferrites were determined with XRD and VSM. On the basis of the experimental results the granule size, σs ,σr and jHc of the ferrite gained from the precursor sintered at 700℃ were found to be 26.92nm, 64.22eum/g,14.25 emu/g and 16KA/m respectively. A heat-resistant ferrite fluid was made with the dispersion of Ni0.7Zn0.3Fe2O4 ferrite into synthetic oil.
  • Jian-Qing DAI
    . 2011, 42(S2): 4-0.
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    Abstract: NiCuZn ferrite powder was prepared by pre-burn oxidation method (precursor which be prepared by chemical co-precipitation pre-burns at high temperature). The results show that the average grain size of NiCuZn ferrite powder prepared by pre-burn oxidation method was about 44nm. As the pre-firing temperature increases, D50 of the sample increased. When the pre-firing temperature was at 850 ℃, the average particle size was about 2mm and the proportional saturation magnetization was 62emu/g for the largest, the initial permeability and cut-off frequency were about 90,59MHz respectively and the deterioration was also low .
  • XIONG Zhen Dong
    . 2011, 42(S2): 5-0.
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    XRD and DSC detection methods were used to investigate the crystallization kinetics behavior and crystalline phase precipitation during crystallization process of Fe63Ni1Al5Ga2P9.65B4.6Si3C6.75Co5 amorphous ribbon by non-isothermal crystallization and isothermal anneal heat treatment. Research results indicated that the behavior of glass transition and crystallization had the typical kinetic characteristics. Eg,Ex,Ep1 and Ep2 of the alloy were respectively 750、340、432 and 689KJ/mol by the Kissinger equations calculation. And the Eg was much higher than Ex, which revealed that the alloy had good thermal stability. The crystallization process of alloy was that in amorphous the α-Fe would precipitated firstly and then Fe2P, Fe3P would precipitated, and α-Fe, Fe2P, Fe3P, Fe3C(Al,Si), Fe5PB2, SiC would precipitated finally. The crystallization types were primary and later eutectic reaction.
  • ; ;;
    . 2011, 42(S2): 6-0.
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    Nanostructured MgO hollow microspheres were prepared with the droplets of a Pickering emulsion as templates. SEM, XRD and BET methods were used for the characterization of the MgO microspheres. The formation mechanism of the MgO microspheres was proposed. The adsorptive ability of the MgO microspheres to Ni2+ was investigated. The results showed that MgO microspheres were of periclase structure and had a specific surface area of 28 m2/g and an average diameter of 63 μm. The surfaces of the MgO microspheres were made up of nanoflakes with an average thickness of 65 nm. MgO microspheres were formed via a hydration reaction of MgO at the oil/water interfaces. The MgO microspheres had a similar adsorptive ability to Ni2+ to that of MgO nanoparticles, while were more easily separated from the aqueous solution by simple filtration procedure.
  • Shan YUE
    . 2011, 42(S2): 7-0.
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    Ordered porous copper with elongated pores has been fabrication by a unidirectional solidification method under a pressurized gas mixture of hydrogen and argon. The measurements were performed with different porosity of ordered porous copper, the coefficients of thermal expansion (CTE) of the metal with the existence and distribution of pores and its effects factors were analyzed from both theoretical predictions and experimental. The results show that the CTE of ordered porous copper increase rapidly to a constant value after with the increase in temperature. When the temperature in 40- 130 ℃ and the majority of pores are clogged, the CTE of ordered porous copper increase slowly in porosity and large than pure copper. In case of the most of pores are penetrated, the larger relative value of porosity and pores diameter, the lower CTE of ordered porous copper. When the temperature be over 130 ℃,the CTE of lotus metals does not depend on the existence of the pores, the CTE of lotus metals is in agreement with that of the matrix metals.
  • . 2011, 42(S2): 8-0.
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    The composite ceramic oxide coatings were prepared on 2A12 alloy by Micro arc oxidation in 40g/L Na2SiO3 with 8g/L Na2WO4 electrolyte added ZrO2 particles. The morphology and the phase compositions of the film were analyzed by Scanning Election Microscopy (SEM) and X-Ray diffraction (XRD). The contents of element in the film were evaluated by Energy Disperse Spectroscopy (EDS). Wear resistant resistant of oxide films were detected by Friction Wear Test. The experimental results show that the coatings were consisted of α-Al2O3 and mullite phases in Na2SiO3 and Na2WO4 electrolyte. The coatings were wear resistant under 10N loading. The ZrO2-Al2O3 composite coatings, consisting of α-Al2O3、t-ZrO2 and m-ZrO2 did not emerge matrix under 30 N for 4200s.
  • ;Gang Zhang
    . 2011, 42(S2): 9-0.
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    The poly(arylene sulfide sulfone) / multi-walled carbon nanotubes (unacidified MWCNTs and acid-treated MWCNTs) composites were prepared by in situ mixing methods. It was found that the composites of PASS and the MWCNTs treated with acid had better compatibility than unacidified. At the same time the composites showed excellent thermal performance and good electrical properties (volume resistivity reduced from 1013.9Ω·mto 104.3Ω·m) with the increase of the content of MWCNTs.
  • . 2011, 42(S2): 10-0.
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    Lead zirconate titanate (PZT)-based nanocomposites embedded with both monoclinic and tetragonal phase ZrO2 nanoparticles were fabricated by the citrate precursor route. During sintering, the intragranular-type nanocomposites piezoelectric ceramics are formed. The phase, composition and microstructure was studied. The fracture mode changed from the coexistence of intergranular and intragranular to intragranular only, while increasing the amount of ZrO2 addition. The intragranular type nanocomposites piezoelectric ceramics are successfully formed by B-Site Citrate precursor route.
  • Chun-Lei SHEN;;;
    . 2011, 42(S2): 11-0.
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    B4C-Al composites were fabricated by high energy milling powder metallurgy technique. The effect of velocity and time of milling on particle-size distribution、B4C particles homogeneity and interfacial bonding of the mixed-powder was investigated. The results indicate that the two factors above are important to particles distribution and interfacial bonding. A specific velocity and a proper mixing time of milling make a uniform distribution of B4C particles and fine interfacial bonding. Milling 6h with low speed and milling 3h with mid speed make B4C particles accumulate in the gap of matrix particles and the interfacial bonding rate is low. Milling 6h with mid speed make a uniform distribution of B4C particles and fine interfacial bonding. Milling 12h with mid speed and milling 6h with high speed also make a uniform distribution and fine interfacial bonding, but generate some agglomeration.
  • Shu Zhang;Jun-Jie BIANChunhu Li;
    . 2011, 42(S2): 12-0.
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    Ceramic supported iron oxides catalysts were synthesized by precipitation (I) and sol-gel (II) methods using FeSO4 as a precursor. The effect of preparation methods and calcination temperature on the structure, morphology, and agglomeration of supported iron dioxide was studied. The catalyst prepared by method II showed higher SO2 removal efficiency. The samples were characterized by SEM-EDS, XPS, XRD and H2-TPR. EDS. SEM-EDS result showed that 13.28% (wt) of iron oxides was supported on ceramic surface of the sample prepared by method II, XPS patterns revealed that the valence of iron was +3. TPR experiments demonstrated that the reduction peaks at 380℃ and 600℃ were attributed to Fe2O3 to Fe3O4 and Fe3O4 to FeO respectively. Because of the excellent hydrophily of ceramic and high dispersion of Fe2O3 in ceramic surface, the ceramic supported iron oxides catalyst (prepared by method II) had high SO2 removal efficiency at low temperature, and it can be used in seawater flue gas desulfurization (FGD) process for coastal power plants, where high-sulfur coal was burned.
  • ;
    . 2011, 42(S2): 13-0.
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    The researches of the sealing process were carried out on some special stainless steels and sealing glass which used in high temperature and high pressure environments. The effects of the sealing process on its tightness and seal strength of the sealing glass and alloys were analyzed. The results show that the seal components endowed excellent sealing quality and compressive strength by means of the high-temperature and high-pressure resistance glass. Its insulation is more than 1000MΩ/500VDC at room temperature and can be not leak at the high pressure of 200MPa.
  • . 2011, 42(S2): 14-0.
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    Abstract: Sn2S3 thin films were prepared by vacuum vapor deposition (on glass substrates). The influences of different proportions of Sb on the structure, surface topography, chemical compositions and optical characterization of the thin films were investigated. The results show that the polycrystal thin films with 5% Sb doped can be obtained after the heat treatment for 30 mins at 380℃ (protected by N2). The size of surface grains of the films is homogeneous and the film surface is compact with a slight aggregation of grains. The internal stoichiometric ratio of the thin films is 1:1.49(Sn:S), but that ratio is 1:0.543 after doped Sb(5%). Sn, S and Sb elements in the film existed with states of Sn2+, Sn4+ , S2and Sb5+, respectively. The optical transmittance rate of undoped Sn2S3 thin films is about zero in the wavelength between 350nm to 500nm; along with the increasing of wavelength, transmittance rate increases as well. The band gap is 2.2eV and the absorption bound is 564nm. After doping Sb, optical transmittance rate reduces apparently and the band gap also reduces to 1.395eV, decreasing 0.805eV comparing to the undoped Sn2S3 thin films. The absorption bounds is 889nm, which moves to infrared region.
  • . 2011, 42(S2): 15-0.
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    The effect of barium content on the conductivity of samples prepared by conventional solid state reaction procedure was studied. The samples were characterised by XRD, SEM, density and ionic conductivity measurement. Powder X-ray diffraction data of Li6BaxLa3-xTa2O12.5-0.5x (x=0-2) indicate that single phase oxides with garnet-like structure exist over the compositional, while for x is larger, the presence of second phase in addition to the major garnet like phase is observed. The cubic lattice parameter increases with increasing barium content, the change is irregular when x>1. The impedance plots of Li6BaxLa3-xTa2O12.5-0.5x(x=0-2) samples obtained at the temperature between 293 and 523K indicate that ionic conductivity increases with increasing the amount of barium and reaches a maximum(8.77×10-6S/cm, 20℃) at x=1 and then decreases with further increase in x in Li6BaxLa3-xTa2O12.5-0.5x(x=0-2). The activation energy decreases with increasing barium content and reaches a minimum(0.41eV) at x=1 and then increases with further increase in x. Scanning electron microscope of sintered powder(x =1) shows that there is a non-uniform microstructure because of agglomeration. Relative density of sample(x=1) is 80.7%.
  • Yu-Jie YANG;Bi-Ru HU;Wen-Jian WU
    . 2011, 42(S2): 16-0.
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    According to the demand of confronting hyperspectral imaging reconnaissance, we analyzed the mechanism and simulation technique of vegetation reflectance spectra. Based on the analysis of influencing factors of chlorophyll stability and the principle of that chlorophyll’s photo-oxidation must have oxygen’s participation, we prepared a spinach pigments/poly(vinyl alcohol) film, which exhibited highly similar reflectance spectra with spinach and good stability more than three months. By the fact, we confirmed the possibility of using chlorophyll in camouflage material, and provided a novel method to achieve the “concolor and conspectra” of camouflage material and vegetation.
  • Bian-Fang ZHANGLi-Hu LIU
    . 2011, 42(S2): 17-0.
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    Zinc ferrite powders were prepared by chemical coprecipitation。The themal decomposition, phase composition, microstructure, magnetic properties and dielectric constant of Zinc ferrite were characterized by TG-DTA, XRD, SEM, VSM and PNA techniques. The results showed that, with the calcination temperature increased, particle size of Zinc ferrite powders increased and magnetism strengthened. Zinc ferrite massives of spinel structure had a negative temperature coefficient of resistivity, moreover, with the calcination temperature increased, dielectric constant decreased.
  • Zhang Shudi
    . 2011, 42(S2): 19-0.
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    Polyvinly-alcohol/ gelatin/ iron oxide black magnetic sensitive hydrogels has been fabricated using physical crosslinking method. The swelling characteristics and magnetic sensibility of the hydrogels were contrasted and analyzed, their microscopic appearance were analyzed using scanning electron microscope and infra-red spectrum, magnetic sensibility were tested using the vibration sample magnetometer. The results show that the magnetic sensibility can be increased from 0.4 MP to 0.7 MP. when the content of iron oxide black is 1.5 percent, the magnetic sensibility is better; the losing water ratio and the swelling performance are both increased with the increasing of the magnetic particals ; it is known that from the SEM photo and the IR picture, the hydrogels compatibility is better; the magnetic sensibility is better.
  • Qian SHENYilong Ma;
    . 2011, 42(S2): 20-0.
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    Bulk isotropic and anisotropic composite magnets were synthesized by blending a Nd-Fe-B powder with an Fe powder using vacuum induction sintering technique. Effects of Fe content, variable sintering temperature and press on the magnetic properties and microstructure of hot-pressed magnets were studied. The result showed that the magnetic properties of hot-pressed magnets could be enhanced by proper addition of Fe powder (3wt.%). The density could be enhanced by increasing sintering temperature or press. However, grains grew seriously and magnetic properties were deteriorated when temperature was higher than 700℃; the densification of magnets was more difficult when temperature was lower than 650℃. The best magnetic properties were obtained with 3wt.%Fe addition and the density reached 7.72g/cm3 at hot-pressing temperature 650℃ and 400MPa: Br=0.852T, Hcj=798kA/m, (BH)m=131.5kJ/m3. After hot-deformation, the magnetic energy product increased to 331kJ/m3.
  • 综述
  • tu zhi ge;chi bo ;;
    . 2011, 42(S2): 21-0.
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    Lithium iron phosphate with both high power and high energy density is a potential candidate for the cathode material of the lithium secondary batteries, which has attracted many researchers to focus on it. The micro-structure and composition of lithium iron phosphate could be revealed by the modern analytical techniques to build the relationship between the micro-state and the macro-performance of this material and finally achieve the goal of the optimization of it. For example, the composition, the molecular structure and the morphology about lithium iron phosphate can be achieved by X-Ray diffraction and the organization structure, the crystal structure, the composition and other information can be detected by electron microscopy analysis. Surface analysis is the method of qualitative, quantitative and valence variation analysis for the elemental composition in lithium iron phosphate. Thermal analysis can be used to measure the thermal stability and the components of lithium iron phosphate. Spectral analysis can be used in the research of the qualitative identification and the structural for the molecular groups of lithium iron phosphate. Electrochemical analysis can be applied to detect the electrochemical properties of lithium iron phosphate. These analytical techniques are the most important part of the modern analytical techniques. The article reviews these relative analytical techniques and the current results about lithium iron phosphate.
  • KANG Zhi Qiang
    . 2011, 42(S2): 22-0.
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    Recent developments of research on the microstructure simulation of monotectic alloys during solidification at home and abroad are summarized.The calculation methods and results in the simulation research are introduced emphatically. The advantages and limitations of various calculation methods of microstructure evolution modeling are discussed. At last, some problems in present studies are pointed out, and research tendency in the future is also proposed.
  • 研究与开发
  • chen yan kun
    . 2011, 42(S2): 23-0.
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    Abstract: The formation of cerium conversion coatings on AZ91D magnesium alloy and structure were investigated, SEM、EDS、Tafel、EIS measurements were adopted. Under 0.02M Ce(NO3)2 aquo-solution, with 5ml/L H2O2 added, at ambient temperature (24±3)℃, immersed 10min, the best protective coating were get, of it the structure was characterized to three layers: honeycomb crystallization layer as an underlayer in intimate contact with the substrate; sealing compact as the intermediate layer ; likely gel layer as the overlayer.
  • ;
    . 2011, 42(S2): 24-0.
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    The corrosion processes of Zn-Al coating in copper accelerated acetic acid salt spray test(CASS) was studied with electrochemical impedance spectroscopy(EIS), and equivalent circuits were proposed, which was based on the physicochemical process of the corrosion. The evolution features of the corresponding electrochemical parameters were analyzed. Scanning electron microscope and X-ray energy-dispersive spectroscopy were used to analyze the microstructure and compositions of Zn-Al coating after corrosion, which was used to explain the evolution features of the corresponding electrochemical parameters. The results revealed that corrosion process of Zn-Al coating changed from charge transfer control to diffusion control and finally got into matrix corrosion period in CASS.
  • ;
    . 2011, 42(S2): 25-0.
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    The integrity of grinding and spark machined surface on 10Ni3MnCuAl steel was researched. Micro hardness, 3-D topography and surface roughness of precipitation-hardening layer on 10Ni3MnCuAl were measured. Residual stress of precipitation-hardening layer on 10Ni3MnCuAl steel was separately measured by XRD. And the variation of residual stress of grinding and spark machined samples in different depth was obtained. The experiment results showed that preferable integrity of grinding surface on 10Ni3MnCuAl steel was obtained in comparison with spark machining, and the sensibility stress concentration was lower. For machining parts of complicated shape, spark machining inimitable superior than grinding. Basis was provided for increasing integrity of machined surface on 10Ni3MnCuAl steel.
  • Yuan Wang ;
    . 2011, 42(S2): 26-0.
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    Ba0.7Sr0.3TiO3 thin films were deposited on alumina ceramic substrates by RF magnetron sputtering method and BST parallel plate tunable capacitors were prepared by photolithographic process. The effect of deposition conditions on dielectric tunability and loss tangent of BST thin films was investigated. It was found that the BST thin film with ~52% tunability and ~0.8% loss tangent were deposited at 4 Pa ambient pressure with an O2/Ar ratio of 30:70, and substrate temperature of 800 ℃. Measurements indicated that the quality factor of BST capacitors decreased from 125 to 42 with test frequency increasing from 1 MHz to 100 MHz.
  • Zhang Hai Yu;Wang Xing Zhe
    . 2011, 42(S2): 27-0.
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    A modified magnetic dipole model is presented in this paper to analyze the magnetic field-induced shear modulus of the magnetorheological (MR) elastomer mixed by different size particles, where the random distribution of the size of ferromagnetic particles inside the elastomer is considered. The model not only can be degenerated to the traditional magnetic dipole model as the ferromagnetic particles being same size, but also is applied to predict the magnetic field-induced shear modulus of the MR elastomer with the distribution of the random-size particles. Additionally, the nonlinear relationship between the magnetic field-induced shear modulus and the volume fraction of ferromagnetic particles in the MR elastomer is predicted which is in good qualitative agreement with the experimental observation.
  • Ha Si Hua
    . 2011, 42(S2): 28-0.
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    Based on the the numerical calculation of ordinary differential equations, the Schr?dinger and Poisson equations are solved self-consistently to obtain the electron eigen-states by considering the built-in electric field, penetration effect, and boundary conditions of the quantum well structure. As an example, the eigen energy levels and transition energies of an electron in different GaN/AlxGa1-xN quantum wells were calculated. The results indicate that the energy of an electron in the quantum well is quantized,and the built-in electric field increases the separation between the energy levels of the electron. Different energy levels can be obtained and transition energies changed by adjusting the well width and Al component.
  • . 2011, 42(S2): 29-0.
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    Abstract: Because of the excellent specialties and wide uses in many fields, TiO2 has a promising future. Supercritical hydrolysis is a new method to produce micro-particles. TiO2 micro-particles were successfully obtained through this method. The resulting samples were characterized by X-ray diffraction ( XRD), scanning electron microscopy (SEM) and Particle-size Analyzer. The influences of process parameters, including pressure, temperature,total flux and ratio of branch flux, on particle size were investigated at the same time. The results indicated that the particle size increased with an increase in the pressure and temperature, while that decreased with an increase in the total flux. We also attempted to explain the reasons. Particles are obtained in the ranger of 32nm-274nm. Key words: TiO2 micro- particles, Supercritical hydrolysis, Process parameters, Particle size
  • ;;;
    . 2011, 42(S2): 30-0.
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    TiN/ Si3N4 multiphase electroconductive ceramics were prepared by pressureless sintering from slag with high titanium and Si3N4 which was synthesized by the carbothermal reduction nitridation method using iron ore tailings. Phase constitutes were analyzed by XRD. The effect of TiO2 content in initial raw materials on phase econsitutes, densification, mechanical properties and electrical conductivity were studied. The results show that the sintered samples consist of Si3N4 and TiN. TheTiN phase enhances with the increase of TiO2 content in initial materials. For the composite samples sintered at 1550℃ using raw materials containing 25% (mass fraction) TiO2, bulk density, hardness and flexure strength are 3.32g?cm-3, 8.97Gpa and 79Mpa, respectively. The minimum amount of TiO2 in initial raw materials is 20% for the formation of electroconductive network in the composites, of which the electric resistivity is 4.25×10-2Ω?cm.
  • . 2011, 42(S2): 31-0.
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    In order to make evenly suspended in the electrobath as to obtain uniform distribution of nano-particles composite platings, in this article the influence of different surfactants on nano-TiO2 dispersion were studied. Nano-TiO2/Ni composite coating was acquired by brush plating method, and the surface micstructure of Nano-TiO2/Ni coating was obsereved by SEM and XRD. The result shows that cationic surfactant has the best effect on dissipating nano-TiO2 in the solution, it doesn’t deposit more than 40 minutes, thus the agglomeration of nanoparticles is solved by CTAB to some degree; the hardness of Nano-TiO2/Ni coating with cationic surfactant CTAB is improved 50﹪compared with that without surfactant, besides the coating has a great combination properties and less porosity; cationic surfactant CTAB leads to fine and dense microstructure of the composite coating, where nanoparticles are distributed homogeneously in the nickel matrix and deposited along the boundaries of electrodeposited Ni grains, furthermore the coating is composed of nano-TiO2 and Ni. Thus, it is evident that codeposition mechanics of n-TiO2 and Ni should be motion, absorption and mechanics mechanism.
  • ;;;
    . 2011, 42(S2): 32-0.
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    Abstract: In this paper, wood plastic composite (WPC) was reinforced by adding 3mm short basalt fiber (BF). The relationship between the content of basalt fiber (BF) and either the tensile properties of basalt fiber-wood plastic composite (BF-WPC) or molten material fluidity was studied. Experimental results showed that the relevant performance of BF-WPC could be effectively improved by controlling the content of BF. Compared to pure WPC, the BF-WPC’s (12% BF content), tensile strength and elongation achieved the maximum value with an increase of 72% and 33%respectively. However, the melted fluidity properties of BF-WPC had decreased sharply when the BF content was elevated to 12%, and slowed down after the 12%.
  • . 2011, 42(S2): 33-0.
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    TiO2 sol was prepared by sol-gel technique using tetrabutyl titanate as precursor, PEG1000 as template, and acetyl acetone as stabilizer. The films were fabricated by dip-coating method on the glass slides. The crystalline structure, surface morphology, composition, transmittance, BET surface area and pore size distribution of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis spectrophotometer, and N2-adsoption and desorption. Photocatalytic degradation of methyl orange on the films under UV-light irradiation was investigated. The TiO2 film was in the anatase phase while Ti was in the Ti4+ state. With increasing amount of PEG1000, surface morphology of the films became rough, and pore size of the powders increased first and then decreased later. The absorption edge of the films in the UV region moved to short wavelength accompanied with fluctuation of transmittance, while film thickness maintained stable. PEG1000 had its optimum doping amount of 2 g when a lot of mesopores appeared in the film performing the largest surface area and optimum photocatalytic activity.
  • Xiu-Zhen WEIJia YANG;Guo-Liang Zhang
    . 2011, 42(S2): 34-0.
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    Hyperbranched polymers are attracting more and more attention in recent years due to the unique structure and properties compared to their linear analogues. The highly branched structure and a large number of terminal functional groups are two important features of hyperbranched polymers. Hyperbranched polymers have found wide use in catalysts, preparation of nanometer metal particles, coating, et al. In the past few years, the practicability of applying hyperbranched polymers in separation membrane has been studied with lots of interest. In this paper, the up-to-date application of hyperbranched polymers in ultrafiltration membrane modification, nanofiltration membrane, gas separation membrane, pervaporation membrane and ion-exchange membrane preparation were described in detail. Future development of hyperbranched polymers for industrial use was also discussed.
  • ;;;;
    . 2011, 42(S2): 35-0.
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    Made with three kinds of oil-soluble hydrazone Schiff base compounds in the copper surface preparation of self-assembled monolayer (SAMS), studied the film in 3.5% NaCl on copper corrosion inhibition. Founded that three kinds of corrosion inhibitor for copper in 3.5% NaCl solution have better inhibition effect by polarization curves and electrochemical impedance spectroscopy. Inhibition of which L2B best, L4B the second, after L3B. Under normal temperature, the efficiency of corrosion inhibitor is 91.75%、90.68% and 88.27% respectively. meanwhile, the effect of temperature on the inhibiter effect is not too.The results of test by AC impedance showed that three kinds of hydrazone compounds in the process of self-assembled film and the corrosion is not decomposed,.Also showed that they are a type of mixed inhibitor dominated by cathode inhibition.Finally,their inhibiting mechanism was discussed preliminarily by the DFT.
  • Bu-Yan LIU
    . 2011, 42(S2): 36-0.
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    Nanocrystalline α-MnO2 was synthesized with solid-phase reaction through heat treatment and acid treatment at room temperature by using KMnO4 and Mn(CH3COO)2?4H2O as raw materials. The sample was characterized by XRD and SEM。The electrochemical characteristics of the sample were characterized by CV and constant current charge-discharge tests。The specific capacitance of the Nano α-MnO2 was 222.7 F/g in 1.0 mol/L Na2SO4 electrolyte at the scan rate of 3 mV/ s ,the current density of 300 mA/g, in the range of-0.1~0.8V(vs.SCE) ,After 1000 times cycle, the capacity is maintain of 85%, a good circulation performance and capacitance stability。The Nano α-MnO2 was an excellent electrode material for supercapacitor。
  • ;
    . 2011, 42(S2): 37-0.
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    Influence of Dy-doping on preparation, structure and magnetic properties of the Sr-ferrites has been studied in this paper. It is found that the orientation magnetic field has a marked effect on the magnetic properties of obtained ferrite. Remanence Br, maximal magnetic energy product (BH)max and coercivity Hc as well as grain preferential-orientation degree of the ferrites increase with a increase of the orientation magnetic field. However, the effect of sintering temperature is more complicate. As the rising of sintering temperature, the remanence Br and (BH)max of ferrite improve, while the coercivity Hcj decreases. With the addition of 0.2%Dy2O3 to presintered SrFe12O19 powder (Trademark Y30), the ferrites prepared processed with wet-pressing at 700 kA?m-1 magnetic field, 450kgf?cm-2 pressure and 1 hour sintering under 1230℃ have a remanence Br of 398 mT, a coercivity Hcj of 254 kA?m-1, and a maximum magnetic energy product (BH)max of 29.1 kJ?m-3 with an increment of 12 mT, 31 kA?m-1 and 0.7 kJ?m-3 respectively compared without Dy2O3 addition samples.
  • ;LIU HUA YING ;;
    . 2011, 42(S2): 38-0.
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    Through using thermal decomposition method to prepare Ti/IrO2+MnO2 anodes, studying the effect of water cooling、 aircooling、 furnace cooling with nitrogen and furance cooling these four cooling ways on the electrocatalytic activity and stability of Ti/IrO2+MnO2 anodes. And the study showed that Ti/IrO2+MnO2 anodes which was obtained by water cooling have the highest electrocatalytic activity, at the same time its anodic voltammetric charge (q*) can reach to 140 mC·cm-2 , however the stability of that anodes were the worst; both the catalytic activity and stability of furnace cooling electrode and nitrogen cold electrode ware fairly bad; air cooling anode have a higher electrocatalytic activity, and its anodic voltammetric charge (q*) can reach to 118 mC·cm-2 , as well as its stability was the highest of all the four anodes. From the comprehensive analysis, air cooling way not only can certain the catalytic activity of the anode, also can ensure the anode has the best stability
  • chen yan kun
    . 2011, 42(S2): 39-0.
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    AZ91D magnesium alloy was selected as the basement. SEM、EDS、Tafel、EIS 、spot-rot and titrations of cerium-based conversion coatings solutions were adopted to investigate the role of H2O2 in the deposition of conversion coatings and influence on corrosion protection properties of coatings. In the case of coating deposition, H2O2 serves as a complex agent, an oxidant, a crystallization inhibitor. H2O2 added suitably amount of, such as Ce:H2O2 (mol ratio) is 1:3, can endow coatings with good corrosion protection properties by promoting the generation of amorphous material Ce(O2)(OH)2 containing a great number of nano-sized crystallites of CeO2.
  • Xing-Lin Guo;
    . 2011, 42(S2): 41-0.
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    The porous biodegradable polymer microspheres are biodegradable, non-toxic and harmless. In recent years, they are applied in drug-controlled release systems, tissue engineering etc. And they become the research focus. In this article, the preparation methods and application fields of porous biodegradable polymer microspheres were outlined, and their prospects are anticipated.
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    . 2011, 42(S2): 42-0.
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    With the improvement of the laser technology, better materials used as substance are in urged. Fabrication of the ones with larger scale and higher concentration of dopant ions became an important field. The paper reviewed the recent investigation of Nd:YAG transparent ceramics in the matter of the history, synthesis of the powders, molding, and the sintering. Some fundamental scientific problems have been put forwards
  • . 2011, 42(S2): 43-0.
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    In this paper, poly(acrylate acid-methacrylate-acrylamide) was synthesized with acrylic acid ,acrylamide and methacrylate acid as monomer, N,N’-methylene bisacrylamide as crosslinking agent ,potassium persulfate as initiator by means of aqueous solution polymerization. The factors such as monomer concentration,monomer ratios, neutralization degree and so on influencing on the properties of moisture absorption were investigated. The best reaction condition and formula were based on the orthogonal experiment design. The optimum moisture absorption amount of P(AA-AM-MA) reached 0.95g/g. The mathematical correlation on various factors and moisture absorption rate was obtained based on the multiple regression analysis . The Moisture Content Intuitive Analysis Table indicated the sequence of the factors influencing hygroscopicity was as follows:urea content>neutralization degree>monomer concentration>monomer ratio>crosslinker agent concentration>initiator concentration.
  • Xiao-Wen LIU
    . 2011, 42(S2): 44-0.
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    a series of poly(lactic acid) (PLA)/ TMC-328 blends were prepared by melt blending based on nucleating agent TMC-328 contents were 0%,0.1%,0.2%, 0.3% ,respectively. This work presented the effect of TMC-328 on poly(lactic acid) (PLA) crystalline structure and property.Various techniques including DSC,SEM and polarized light microscopy(POM) were employed to investigate crystalline structure property and thermal properties for the samples.Experimental results indicated that the influence of TMC-328 on crystallization properties of PLA embodied in the PLA cold crystallization,and the optimum TMC-328 addition was 0.1%,according to the cold crystallization temperature(Tcc) and enthalpy(ΔHcc) from 126.14 down to 111.40,from 11.34J/g to 23.49J/g,respectively.It was approximately 22 minutes until the PLA crystallization completely from melt at 100℃.The agglomeration of TMC-328 increasing with the contents becomes obviously by the SEM photographs.
  • ; ;;;;
    . 2011, 42(S2): 45-0.
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    Abstract: Using steel slag and charcoal as raw materials, the steel slag/charcoal nano-/micro-composites with magnetic-resistance mixed loss mode were fabricated by a high-performance milling process, and then the composition, phase structure, morphology, and electromagnetic (EM) characteristics of the products were characterized by XRD, EDS, SEM, and vector network analyzer, respectively. The results showed that EM characteristics of the products were strongly dependent on the content of the charcoal (WCharcoal). The real and imaginary parts of the permittivity of the steel slag/charcoal nano-/micro-composites significantly increased with the increasing WCharcoal. Among them, the steel slag/charcoal composites with WCharcoal =50 wt% exhibited the best EM-wave absorption performance, with a maximum reflectivity value of -33.4 dB, the effective bandwidth 15.2 GHz(≤-10 dB) and 8.6 GHz (≤-20 dB), respectively, which is a consequence of enhanced dielectric loss and a proper EM matching.
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    . 2011, 42(S2): 46-0.
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    The carbonyl iron/polystyrene composites were prepared by the hot pressing method. The structural characteristics, morphology and electromagnetic properties of the composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and HP8510 network analyzer. The results indicated that the complex permittivity values and complex permeability values of the carbonyl iron/polystyrene composite showed an increasing trend with the increase of the carbonyl iron. The composite with 75 wt% carbonyl iron content showed better electromagnetic wave absorbing property, with a minimum reflection loss of -15 dB at 14 GHz and a bandwidth of -10 dB over the extended frequency range of 4.1 GHz.
  • . 2011, 42(S2): 47-0.
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    (Na0.66K0.34)NbO3 ceramics were prepared by conventional oxide solid-solution technique and the effect of CuO on the piezoelectric, dielectric and ferroelectric properties were investigated. The experimental results showed that the doping of CuO facilitated the grain growth and lowered the sintering temperature. By proper doping of 0.5 mol% CuO, the sample density and mechanical quality factor Qm was improved to 4.26 g/cm3 and 400, respectively, the dielectric loss was depressed sharply from about 4.3% to 0.8%. The experimental results also showed that the doping of CuO has a “hard” effect on the properties of (Na0.66K0.34)NbO3 ceramics. The Curie temperature (TC), orthorhombic-tetragonal phase transition temperature (TT-O), piezoelectric coefficient d33 and electromechanical coupling coefficient kp decreased, whereas the coercive field Ec increased with increasing CuO content. The good property of d33=107 pC/N for the sample without CuO suggests that the composition of (Na0.66K0.34)NbO3 is another promising lead-free candidate for investigation besides (Na0.5K0.5)NbO3 system.
  • Jiang LIN ;
    . 2011, 42(S2): 48-0.
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    Nonequilibrium atmospheric pressure plasma jet is developed as a new setup for films’ deposition in recent years. Due to its advantages such as atmospheric pressure, low temperature, high deposition rate, simple setup and so on, it is noticed widely. In this letter, a nonequilibrium atmospheric pressure plasma jet supplied by impulsing power source is developed to deposit silicon dioxide ?lms. The nonequilibrium atmospheric pressure plasma jet was operated by feeding a mixed gas in which pure nitrogen gas is mixed by a small amount of oxygen gas. Tetraethoxysilane(TEOS) is used for precursor; N2 was used for carrier gas with flow rate varied from 20 sccm to 160 sccm. Ellipsometer, fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were used to character the deposited film. The results reveal that the deposited films on the silicon substrate are silicon dioxide films with containing OH groupe, and rough surface. With increasing the TEOS flow rate, the deposition rates increase linearly. On the other hand, both the content of the Si-OH groups and the number and size of the sphere in the films’ surface increase with the TEOS flow rate, which is thought to be due to the increasing of the deposition rate.
  • ;Zhou Ming
    . 2011, 42(S2): 49-0.
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    Abstract : The indium tin oxide (ITO) thin films were prepared on glass substrates by DC magnetron sputtering process at room temperature, Using an ITO target with a combination of 90%In2O3 and 10%SnO2in mass fraction. The crystal structure and surface shape of the film are analyzed by SEM, the light transmittance and resistance are measured by UV-2550 and SZT-2. The influences of sputtering pressure and sputtering power on the electrical and optical properties of as-deposited ITO thin films were investigated. The result manifest that the resistance of the ITO thin get decreases with increasing of sputtering power ,ITO thin have a good light transmittance in sputtering power of 110W.when the sputtering pressure at 1.0pa,is good for increasing light transmittance and decreasing resistivity.