30 March 2013, Volume 44 Issue 06
    

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    综述·进展
  • Survey of equivalent mechanical and thermal analysis of heterogeneous material
    REN Yi;YANG Hai-tian;WANG Chun-ting
    . 2013, 44(06): 761-765.
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    Abstract:The time-dependent solution of mechanical and heat conduction for heterogeneous material often appeared in various fields of engineering. These problems are thus of great importance for engineering and theory. A direct way is to consider the geometrical and mechanical property of component in the heterogeneous material, respectively, and then discretize the problem in space/time domain, but this caused a huge computational cost or would be impossible. Another way is to consider the heterogeneous material as macroscopical homogenous material and equivalent analysis, the computational cost will reduce sharply. This paper presented a numerical method for time-dependent equivalent analysis of heterogeneous material by concerning the viscoelastic jointed rock and linear transient heat conduction problem of heterogeneous material.
  • Progress in the research of iron-based superconducting wires & tapes
    QIAN Lei;WANG Lei
    . 2013, 44(06): 766-771.
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    Some of the basic characteristics, especially the weak-link effect, of the iron-based superconductors were reviewed at first. Then the fabrication process for iron-based superconducting wires & tapes, sheath materials, grain boundary structure and chemical doping were summarized, and some recent progress involving high critical current density were introduced briefly. Finally, a perspective and future development of iron-based superconducting wires & tapes were also given.
  • Advances in adsorption of polycyclic thiophenic compounds from diesel by activated carbon
    Yu Mo-xin;FAN Liang-wei;ZHANG Chen;HE Xiao-jun;ZHENG Ming-dong;LI Zhong
    . 2013, 44(06): 772-775.
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    Activated carbons show a good adsorption performance for refractory polycyclic thiophenic compounds which can not be removed by hydrodesulfurization and adsorption method using molecular sieves. The paper is reviewed on the adsorption desulfurization on activated carbons including the structure-activity relationship, surface modification and adsorption mechanism. The mesoporous carbons play an important role in the adsorption of polycyclic thiophenic compounds with big size; the oxygen-containing groups in the carbon surface can promote its adsorption capacity. The adsorption selectivity and capacity for polycyclic thiophenic compounds can be improved by loading metal ions or oxidative modification. To make activated carbons as adsorbents for desulfurization used in industry earlier, the research on the preparation of mesoporous carbons, surface modification and synergistic effect of pore with surface chemistry property should be promoted in future.
    • 研究·开发
  • MgFe2O4 nanoparticles preparation and its electromagnetic properties
    TANG Hong-zhi;XU BO;WANG Shu-lin;ZHANG Yong-gang
    . 2013, 44(06): 776-779.
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    Spinel MgFe2O4 particles was synthesized after ultrasonic cavitating mixture of Mg(OH)2/Fe(OH)3 for four hours. The mechanism of solid-phase reaction ,the material of composition structure and microstructure was characterized by TG-DTA ,XRD and TEM, and electromagnetic properties was studied by vibration sample magnetic field meter (VSM) and vector network analyzer. The results showed that: MgFe2O4 particles calcined at 700℃ was nanometer level of single crystal structure, having high purity and well crystallization ,and particle size was the range from 20 to 45 nm. MgFe2O4 of saturation magnetization strength Ms is 21.015 emu/g, residual magnetism Mr is 2.5798 emu/g, coercive force Hc is 90.171 G; MgFe2O4 is the dielectric loss materials in the range of 7～18 GHz frequency.
  • The Sound absorption properties of FeCrAl Fiber Mixed Felt
    AO Qing-bo;YANG Hui-ping;ZHU Ji-lei;WANG Jian-zhong;ZHI Hao;MA Jun
    . 2013, 44(06): 780-782.
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    The FeCrAl fiber with three kinds of wire diameters were scattered by the dispersing machine, and prepared into single layer mixed felt by the paved felt machine. The three kinds of FeCrAl fibers were uniformly distributed in the mixed felt of single layer. There is a different internal structure was found for this mixed felt compared with the homogeneous felt. In this work, the acoustic characteristics of the mixed felt prepared by three different FeCrAl fibers were studied, and investigated the differences between this kind of mixed felt and the other fiber porous materials with the same structure parameters. The results indicated that tow kinds of fibers porous materials with the same wire diameters and the different materials, had the similar sound absorption properties. The change rule of the sound absorption properties of the fiber porous materials made by mixed felt were the same to other fiber porous materials. No matter how to change the internal structure of the single layer materials，its sound absorption properties were worse than the sound absorption performance of the normal gradient structure.
  • Preparation and electrosorption of carbon aerogel electrodes doped with titania
    LIU Ling;LI Xing-chao;MENG Qing-han
    . 2013, 44(06): 783-787.
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    Carbon aerogels doped with anatase form of titanium oxide were synthesized by sol-gel polymerization of a mixture of resorcinol, formaldehyde and tetrabutyl orthotitanate, followed by gelation, supercritical drying and carbonization in N2 gas atmosphere. The effect of different solvents on synthesis was studied by TEM and XRD. The results show that carbon aerogels with homogeneously doped TiO2 can be prepared in ethanol instead of water in sol-gel polymerization process. Carbon aerogels doped with TiO2 were used as electrodes to treat NaCl solution through the electrosorption process. The effects of doped TiO2 contents, voltages and solution concentrations on the electrosorption capacity and the recyclable performance of Ti-doped carbon aerogel electrods were investigated. The incorporation of titania into carbon aerogels can considerably increase electrosorption capacity and decrease physical adsorption. The electrosorption capacity increases with increasing voltage and solution concentration. The electrosorption capacity of 20% Ti-doped carbon aerogel is 5 times as much as that of carbon aerogel, and the recyclable performance are stable , so the carbon aerogels doped with TiO2 are an ideal material for electrosorption application.
  • Theoretical study of wurtzite ZnO electronic structure by doping with Alkaline earth element
    LIN Lin;YANG You-chang;YANG Jie-cai
    . 2013, 44(06): 788-790.
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    The electronic structure of pure and an alkaline earth atom doped wurtzite ZnO has been investigated by using first-principles ultrasoft pseudopotential method.The calculation indicates that the band gap of ZnO narrowing with atomic number increasing, but still larger than the band gap undoped (except Ra), which shows the metallicity of alkaline earth stronger than the Zn’s and that causes the level of electrons density distribution of oxygen towards the alkaline earth to become larger than it was Zn before.
  • Synthesis of Core/Shell Structural CdS/ZnO Nanoparticles and their optical properties
    CAI Hong;DU Qing-bo;CAO Wen-gen
    . 2013, 44(06): 791-794.
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    CdS semiconductor nanoparticle was synthesized via thermal decomposition of organometallic precursors in coordinating solvents. TEM images indicated that the size of CdS was about 12nm. Coated semiconductor CdS/ZnO nanostructures were fabricated by coating the CdS core with a layer of ZnO using CTAB as surfactant. The results of PL suggested that CdS/ZnO was formed. Compared to CdS nanoparticles, the band-gap emission of CdS/ZnO was greatly improved as the temperature raising gradually, which means the shell of ZnO modified the surface of CdS core and reduced the surface defect.
  • Study on the Absorption Property of Collagen Fiber Toward Cr（VI）
    WANG Xue-chuan;ZHANG Fei-fei;QIANG Tao-tao;WANG Xiao-qin
    . 2013, 44(06): 795-799.
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    Collagen fiber was used as a absorbent to removal hexavalent chromium from water. Effect of pH, temperature, absorbent dosage and initial concentration of Cr(VI) on its removal rate were examined in the batch mode. The results indicated that the modified collagen fiber was very effective for removal Cr(VI) from water. The removal of Cr(VI) increased with the decrease of solution pH value, and the maximum removal rate was attained at pH 3.0. The increase of absorbent dosage would raise the removal efficiency, while it would simultaneously reduce the absorption capacity. Moreover, the removal of Cr(VI) was found to decrease with the increasing of initial concentration of Cr(VI). Whereas, the Cr(VI) uptake capacity increased with the rise of Cr(VI) initial concentration until reaching saturation. The absorption equilibrium time was 6h and the optimum absorption temperature was 40℃. Results showed that the isotherm adsorption followed the isothermal adsorption model of Freundlich. The adsorption kinetics followed the mechanism of the pseudo-second-order equation. Furthermore, Fourier transform infrared spectroscopy (FT-IR), and energy dispersive spectrometer (EDS) analysis were employed to characterize CF, and further to elucidate the mechanism involved in the absorption process which included the electrostatic absorption and ion exchange power.
  • Preparation, Characterization and Adsorption Properties of Cadmium(II) Ion Imprinted Silica Gel Sorbents
    ZHANG Dong-sheng;FAN Xue-lei;YAN Feng
    . 2013, 44(06): 800-804.
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    A Cd2+-imprinted silica gel sorbent was prepared by surface imprinted method with Cd2+ as the template, 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane as the functional monomer, silica gel as the support, and epichlorohydrin as the cross-linking agent. The adsorption properties and selective recognition ability of the imprinted sorbent were studied by equilibrium-adsorption method. The results showed that the maximum static adsorption capacity of the imprinted sorbent was 30.8 mg?g-1, the adsorption equilibrium could be reached in 20 min, there was no influence of pH values in the range of 4-8 on the adsorption capacity of the imprinted sorbent, and the imprinted sorbent could be used repeatedly and indicated high selectivity for Cd2+ even in the presence of the other metal ions.
  • Study on the synthesis and conductive performance of graphite oxide/multi-wall carbon nanotubes hybrid material
    GU Zhe-ming;LI Xiao-hui;HU Xin-xin;BAO Hua
    . 2013, 44(06): 805-808.
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    We synthesized graphite oxide(GO)/multi-wall carbon nanotubes(MWNTs) hybrid material with good conductive performance. The hydrogen bonding between GO layers in the hybrid material was subsided when the content of MWNTs was increased, and interlayer spacing of GO was enlarged proved by IR、Raman spectra and X-ray diffraction. The intersecting surface and surface images of hybrid material were observed by SEM, it showed that the original heaped GO layer-structure happened to exfoliate when MWNTs inserted, and MWNTs had a good dispersion in hybrid material. When the ration of GO and MWNTs charged 1:4 from 1:1, the conductivity increased by 5 orders of magnitude.
  • Bond properties at interface of steel fiber reinforced micro-expansion concrete filled steel tube
    DING Qing-jun;ZHO Xiao-jun;MOU Ting-min;FAN Bi-kun;YAN Ya-lin
    . 2013, 44(06): 809-813.
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    Abstract: The bond behaviors of steel fiber reinforced micro-expansion concrete filled steel tube (SECFST) were investigated based on push-out test of 30 specimens. Failure characteristics of interfacial bond between steel tube and concrete core during the test were described, and the influence factors of bond properties were analyzed and discussed. The results show that SECFST have much higher bond strength than conventional concrete filled steel fiber (CSFT). Steel ratio and diameter-thickness ratio of the specimens are sensitive parameters to the bond properties, and it also moderately affected by the length of the steel tube-concrete core interface and the content of steel fiber in concrete core when the steel ratio is lower than 22.0%. The addition of steel fiber can decrease the bond strength of micro-expansion concrete filled steel tube, so the suggested volume fraction is not greater than 0.75%.
  • Preparation and Characterization of Fullerene ethylenediamine lead salt
    LI Li;PENG Ru-fang;JIN Bo;ZHAO Feng-qi;XU Si-yu;FAN Li-sheng;LIU Qiang-qiang;CHU Shi-jin
    . 2013, 44(06): 814-817.
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    A new combustion catalyst, fullerene ethylenediamine lead was prepared via a two-step process involving initial ammoniation reaction and subsequent lead salt forming reaction of fullerene.The effects of material ratio, reaction temperature and reaction time on the lead content of fullerene ethylenediamine lead were investigated by single-factor method. The optimum reaction conditions of 49.4% lead content in fullerene ethylenediamine lead salt were: molar ratio of fullerene ethylenediamine derivative and lead nitrate 1:15, reaction temperature 35°C, and reaction time 2.0 h. Synchronously, the structure of product was characterized by FT-IR、1H NMR、XPS、AAS, etc.. The thermal stability of fullerene ethylenediamine lead was studied by DTA and TG, and results indicate that the thermal stability of fullerene ethylenediamine lead is good.
  • The properties of intermetallic compounds at Sn3.0Ag0.5Cu/Cu
    YANG Xue-xia;XIAO Ge-sheng;LI Zhi-gang;SHU Xue-feng
    . 2013, 44(06): 818-821.
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    The samples were prepared according to actual reflow soldering condition and service. The micro-structural and chemical analyses of the samples were measured by using scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis (EDX). With W. C. Oliver method and continuous stiffness measurement (CSM) technique, continuous values of hardness and elastic modulus varying with the indentation depth for IMC were measured, The Young’s modulus and hardness of IMC was 5.2±0.2GPa and 104.51±2.62GPa. The creep stress exponents were 15.129、61.463、70.27 for solder、Cu and IMC respectively.
  • Influence of substrate structure on photoelectricity of copper film prepared by magnetron sputtering
    MENG Ling-ling;WEI Qu-fu;HUANG Xin-min
    . 2013, 44(06): 822-825.
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    Nanoscale copper films were produced on the surfaces of PET woven, knitted and nonwoven fabrics by RF(radio frequency) magnetron sputtering at room temperature, respectively.The color camera was used to observe the surface morphology of the samples.The light transmission and electrical conductivity of samples were measured by ultraviolet-Visible spectrophotometer and four point resistance probes, was used to observe the pores of the substrates.The analysis revealed that the surface morphology and pores of the substrates had influences on their photoelectricity.With the porosity of the substrates increasing, the ultraviolet protection behaviour and conductivity of samples reduced.
  • Influence of heat treatment on the photoelectrochemical performance of Zn2+-doping TiO2
    GAO Jia-cheng;XIE Feng-yu;ZHANG Min
    . 2013, 44(06): 826-830.
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    Zn-doped TiO2 thin films on titanium substrates were prepared by sol-gel method with titanium tetrachloride as the precursor and ZnCl2 as a source of zinc. The heat-treatment temperature dependence of the photoelectrochemical performance in 0.2mol/L Na2SO4 of the Zn-doped TiO2 film was investigated by the techniques of Mott-Shotty relation, electrochemical impedance spectroscopy, and linear sweep voltammetry. The results from Mott-Shotty curves show that the obtained films all were N type semiconductor, and the film at 300℃ has the highest position of conduction band and the widest space charge layer. The EIS resistance of the 300℃ film decreases most from the state of illumination to the dark. The strongest light current occurs in Zn-doped TiO2 film at 300℃ from LSV curves.
  • Working Principle Analysis of Tension Sensor of Carbon Black/Silicon Rubber Based on GEM model
    MIAO Wei;HUANG Ying;LI Rui-qi;LIU Xiu-mei;CAI We-ting;GAO Feng
    . 2013, 44(06): 831-834.
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    The impact of resistivity and resistance coefficient of geometry on “positive tensile force coefficient of resistance” (PTCR effect) of stretch-sensitive conductive rubber based on carbon black/silicon rubber materials was studied by the general effective medium theory, and then revealed the resistance changing principle of stretch-sensitive conductive rubber. In the tensile range of 40%, when the ratio of conductive filler was in the center of seepage zone, the increase of resistivity was the main reason for PTCR effect. With the increase of the conductive filler, the increase of the geometric coefficient of resistance was the main reason for PTCR effect. The “positive tensile force coefficient of resistance” (PTCR effect) of stretch-sensitive conductive rubber was related to the tensile length when the ratio of conductive filler in a particular range. The increase of geometric coefficient of resistance dominated in PTCR effect when the tensile length was small, the increase of the resistivity dominated in PTVR effect when the pressure was large.
  • Preparation of Organic Vermiculite and Application for Adsorption of 2,4-dichlorophenol from aqueous solutions
    WANG Wan-mu;Wu Ping-xiao
    . 2013, 44(06): 835-839.
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    Organic vermiculites were obtained by modifying raw vermiculite with hexadecyltrimethylammonium bromide (HDTMA) at different concentrations, and characterized by X-ray diffraction (XRD) spectra and Fourier transform infrared (FTIR) spectra. Then these organic vermiculites were assessed for adsorption of 2,4-dichlorophenol (2,4-DCP) and The effects of adsorption, pH and temperature on adsorption were all discussed. Experimental results were fit with Langmuir and Freundlich equations and mechanism of adsorption was discussed. The experiment results showed that alkylammonium cations can enter into the interlayer of vermiculite successfully. Compared to raw vermiculite of 12.72mg/g, the adsorption capacity of organic vermiculites were increased significantly and equilibrium adsorption quality of OVMT-1.0 reached 90.12mg/g. There was a better adsorption effect under acidic conditions. The results showed that the isothermal data of 2,4-DCP adsorption on OVMT-1.0 fit well to Langmuir and Freundlich equations. The adsorption capacity of 2,4-DCP on organic vermiculite decreased with the increase in temperature. Thermodynamic analysis suggested that the adsorption behavior was a spontaneous physical adsorption process and low temperature was of benefit to adsorption. The desorption rates of materials were low.
  • Study on Electrical Conductivity Properties of Silica Black Composities
    MENG De-chuan;WANG NIng-hui;LI Guo-feng
    . 2013, 44(06): 840-842.
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    The positive and negative coefficient temperature effects properties of silica black composities are introduced. The conductivity dependency of sample content and temperature dependency of conductivity are analysised. The results showed that:the composite conductivity increases gradually with the increase of the content of silica black.The conductivity reaches the extrem point when the content of silica black is 55wt%,and then it dropped. The conductivity decreases with the increase of temperature and shows the NTC effect when the temperature bellow 140℃。IT shows PTC effect when the temperature exceed 140℃。
  • Study on a Fluorescent Eu-containing Hydrotalcite/PMMA Nanocomposite
    CHEN Hong;JIANG Li-hong;ZHANG Wen-gong;LING Qi-dan
    . 2013, 44(06): 843-846.
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    An exfoliated red light emission polymer/layered inorganic nanocomposite (Eu-HTLc/PMMA) was synthesized through intercalation in situ polymerization. The composition and structure of the resulted nanocomposite were characterized and determined by fluorescence spectrum, X-ray diffraction, TG-DSC, AFM, etc. The results indicate that the brucite-like layers of Eu-containing hydrotalcite-like compound (Eu-HTLc) were completely exfoliated in PMMA matrix, the nanocomposite can mainly emit characteristic fluorescence of europium ion under ultraviolet excitation at 365nm. The nanocomposite also has better thermal stability than that of the pure PMMA.
  • The research on Ostwald ripen process of GaAs (001) films by MBE growth
    WANG Ji-hong;LUO Zi-jiang;ZHOU Xun;GUO Xiang;ZHOU Qing;LIU Ke;DING Zhao
    . 2013, 44(06): 847-849.
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    GaAs films were prepared on GaAs (001) substrate by MBE, and the Ostwald ripening process of the GaAs surface were studied though STM in this paper. During the growth, RHEED intensity oscillations and RHEED patterns were used to measure and monitor the real-time growth rate and status. After growth and subsequent annealing, GaAs films were quenched down to room temperature and transferred into STM chamber under ultra high vacuum for scanning. STM images showed that GaAs surface should ripen gradually starting from the as-grown surface if one prolongs its annealing time. During the ripening process of GaAs films, all kinds of islands will coalesce and merge into terraces finally, at the same time the pits will dissolve in terraces. We explained the reasons for various morphology revolutions on GaAs surface during the ripening process. After ripening, the GaAs surface reached ordered flat morphology.
  • Research on the dynamic creep performance of the TLA modified asphalt
    YANG E;ZHANG Xiao-ning
    . 2013, 44(06): 850-853.
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    Through the dynamic creep test of the TLA modified asphalt with different contents , Based on the the BURGERS model viscoelastic theory fitting analysis, This paper focuses on the model parameter variation with temperature and content, and with different contents of the creep curvethe shape variation. The results show that the higher of the TLA modified asphalt creep curve;Any content TLA modified asphalt can be fifed by the BUEGERS model, as the temperature rises, all the parameter values were significantly smaller; the GV values rises by the temperature, the GV rate of increase was more significant when the dosage is greater than 30%; the TLA modified asphalt creep curve shape of the three stages is closely related to the parameter size.
    • 工艺 ·技术
  • Effects of pH values and temperature on the electrochemical corrosion behavior of galvanized steel in simulated rust layer solution
    LIU Shuan;SUN Hu-yuan;SUN Li-juan
    . 2013, 44(06): 858-861.
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    the effects of pH values and temperature on the electrochemical corrosion behavior of galvanized steel in simulated rust layer (SRL) solution were studied by using the polarization curves, electrochemical impedance spectroscopy and scanning electron microscopy (SEM). The results indicated that galvanized steel was in the passive state in high alkaline SRL solution, the corrosion resistance of galvanized steel increased with the increase of pH values of SRL solution. The corrosion rate of galvanized steel was almost invariant in temperature range from 0 to 40℃. However, when the temperature raised to 60℃, the corrosion rate of galvanized steel increased rapidly.
  • Research on crystallization of CdZnTe film by Al-induced crystallization
    PANG Song-hai;ZHOU Hai;ZENG Dong-mei
    . 2013, 44(06): 862-865.
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    Using Cd0.9Zn0.1Te crystal and aluminum (purity of 99.999%) as target, with magnetron sputtering method, we prepared CdZnTe film on the glass by aluminum induced crystallization. We studied the structure and the nucleation mechanism of CdZnTe film by AIC. Studies have shown that the structure of aluminum-induced CdZnTe film is zine blende structure with oriented growth of the (111) crystal surface. We found that aluminum covered on the surface of the CdZnTe film firstly reacted with the ZnTe phase, and then formed ZnAl2Te4 phase as a core which promoted the film recrystallization of the clusters of small grains. In addition, aluminum-induced greatly enhanced the advantages of oriented crystallization of (111) crystal surface, and the crystalline quality has been greatly improved.In this paper, we also studied the optical properties of the films.
  • Synthesis, optic and electrochemical properties of 2-[(8-hydroxyquinoline)-2-yl]-5-(2 -thienyl) [60] fullerene pyrrolidine
    LI Xiang-zi;WEI Xian-wen
    . 2013, 44(06): 866-869.
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    A new compound 2-[(8-hydroxyquinoline)-2-yl]-5-(2-thienyl) [60] fullerene pyrrolidine was synthesized via 1, 3-dipolar cycloaddition reaction. The product was characterized by UV-vis, FTIR, RAMAN, MALDI-TOF MS, 1H NMR and 13C NMR. Its optic and electrochemical properties have also been studied. The results show that comparing with C60, its wavelength of ultraviolet absorption and fluorescence emission all shows red-shift, and its half-peak potentials appear obvious negative shift. It is more propitious to be applied in the field of photoelectronic conversion.
  • Synthesis and properties of transparent superhydrophobic and oleophobic coatings
    LIU Chao-yang;CHENG Xuan
    . 2013, 44(06): 870-873.
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    The uniform coatings were obtained by spraying nanosilica particles and polymer suspensions into surfaces of different substrates based parts with complicated shapes. The effects of SiO2 amounts on properties of surface coatings were investigated. It was shown that the water contact angles measured on the surface of coatings were larger than 150°, while the oil contact angles were higher than 90°, implying the superhydrophobic and oleophobic surface coatings. In addition, the coatings showed excellent transparencies. The hardness and adhesion of the coatings reached the highest levels of 6H and 5B, respectively, under the international standards of ASTM D3363-05 and D3359-09. The hydrophobicity, oleophobicity, and transmittance of surface coatings were enhanced by the additions of appropriate amounts of nanosilica particles.
  • Preparation and characterization of TiO2 supported tubular kaolinite
    DENG Zhong-wen;ZHANG Yu-ying;LONG Hai;DU Qi-feng;ZHANG You-fang
    . 2013, 44(06): 874-877.
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    Tubular kaolinite as a support was obtained by the exfoliation and rolling of cetyltrimethylammonium chloride replacement reaction with kaolin/methanol intercalation compound.TiO2 doped tubular kaolinite catalysts were prepared by sol-gel method in aqueous solution of nitric acid. The structural and morphological of kaolinite and its intercalation compounds were investigated by XRD, FTIR and FE-SEM. Compared with pure TiO2, composite catalyst has obvious enhancement in the utilization ratio of light absorption, especially in the visible range. The photocatalyst efficiency of TiO2 doped tubular kaolinite has increased by 30% on the degradation of methyl orange in aqueous solution, after irradiation for 30min under 500 w mercury lamp.
  • Forecast Research on Mechanical Properties of Carbon/Carbon Composites Made by Axial rod method
    LIAO Ying-qiang;LIU Yong-qiong
    . 2013, 44(06): 878-882.
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    In order to give a perfect forecast method about mechanical properties of carbon/carbon composites made by axial rod method; firstly, representative volume element is given; secondly, subprogram of periodic boundary conditions is compiled using periodic boundary conditions as theory basis; lastly, forecast research on mechanical properties of carbon/carbon composites made by axial rod mechod is carried out using homogenization theory and bilinear cohesive model. As a result, in the base of homogenization theory, bilinear cohesive model and periodic boundary conditions, forecast on mechanical properties of carbon/carbon composites made by axial rod mechod can be carried out rapidly using representative volume element .
  • Application of the Uniform Design in the Optimizing Technology of the Titanium Dioxide Inorganic Coated
    DUAN Hai-ting;HOU Qing-lin;CHEN Jian-hua;HOU Yi-hui;LIU Yue-jin;LI Shi-nong;YANG Si
    . 2013, 44(06): 883-887.
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    This paper researched the new Technology of the rutile titanium dioxide ternary Inorganic coated by sol-gel method．The regression equation and the optimum conditions are founded by uniform design and the systemetical research of various factors on the properties of the rutile titanium dioxide ternary Inorganic Coated．Effect of The rutile titanium dioxide ternary Inorganic coated were characterized by Nano-ZS,Fourier infrared spectroscopic analysis (FT-IR)、scanning electron microscopy (SEM)、transmission electron microscopy（TEM）. The optimized formula of preparing the rutile titanium dioxide ternary inorganic coated is that the dispersant of 0.20%，the ZrO2 content of 0.6%，the SiO2 content of 3.0%，the Al2O3 content of 1.6%，the rotate speed of 340r/min.
  • The influence of the preferred orientation of Mo thin films on the sputtering time
    ZHANG Yan-xia;JI Ya-xin;OU Yu-feng;YAN Yong;LI Sha-sha;LIU Lian;ZHANG Yong;ZHAO Yong;YU Zhou
    . 2013, 44(06): 888-892.
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    In this paper, molybdenum (Mo) thin films have been deposited on soda-lime glass substrates using DC magnetron sputtering method and were characterized by XRD, SEM and four-probe instrument. The results show that the crystal structure, surface morphology and electrical properties of Mo thin films were affected by the deposition time. The films deposited at short time are preferentially oriented along（110）plane, and films deposited beyond 15 min show（211）preferred orientation. With the increase of deposition time, the crystallographic orientation of Mo thin films transforms from （110）plane to（211）plane. Surface morphology of the films changes form triangular particles to rectangles particles, resulting from the crystallographic orientation transformation. Accordingly, the electrical resistivity of films also change from 3.92×10-5Ω?cm to 4.27×10-5Ω?cm. The corresponding growth model of the Mo films change from Thorton’s Zone Model to texture to crystal zone 2 structure.
  • Preparation of MgB2 superconducting thin films by hybrid physics-chemistry vapour deposition
    Zhang Yu-zhou;YANG Fa-shun;WANG Song;YANG Jian;FU Xing-hua
    . 2013, 44(06): 893-896.
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    We have fabricated several superconducting MgB2 thin films by using the hybrid physical-chemical vapor deposition (HPCVD) on Al2O3 (0001) substrate by using B2H6 at different deposition temperature. Scanning electron microscopy, x-ray diffraction and four-point probe method were carried out to study the effect of the deposition temperature on the superconductivity, surface morphology and structure of MgB2 thin films. The results showed that the MgB2 thin films have a preferred crystallization, c-axis orientation and Superconducting properties as the temperature increasing.
  • Effect of Sintering Temperature on Microstructure and Mechanical Properties of TiNi Alloy
    LI-Jing;YANG Hai-lin;JIE Yun-feng;RUAN Jian-ming
    . 2013, 44(06): 897-901.
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    Porous Titanium–nickel (TiNi) shape memory alloy (SMA) with homogeneous pore distribution and good mechanical properties was fabricated by pure element powders sintering process. Effect of sintering temperature on microstructure and mechanical properties of TiNi alloy was studied by Xray diffraction (XRD), metallurgical microscope, scanning electron microscopy (SEM) analysis and electronic universal testing machine at 900℃, 950℃, 1000℃, 1050℃, 1100℃ or 1150℃. The results showed that sintering temperature is the determinants affecting the properties of porous TiNi alloy, then phase composition, pore characteristic and mechanical properties are improved by change of sintering temperature. With the increase of the temperature from 900℃ to 1150℃, secondary phase disappeared and phase composition is more homogeneous. The relative density values of porous TiNi increases from 59% to 62%. Tensile strength values increases from 72.43MPa to160.12MPa, and elastic modulus values increases from 1.08GPa to1.32GPa.
  • Electrochemical characterization and evaluation of electroless coating porosity
    YU Yang;ZOU Yong;LUAN Tao
    . 2013, 44(06): 902-905.
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    Ni-P coatings with different porosities were prepared by changing coating thicknesses. Image analysis software was introduced to the neural chemical porosity tests to make the pore-counting process more reliable. The relationship between coating porosity and electrochemical behavior was investigated. Electrochemical methods were used to evaluate the coating porosities. The results of polarization curve tests showed that the coatings with smaller porosities exhibited more positive corrosion potential and lower corrosion current density. Polarization curve measurements can detect the existence of fin-pores in the coating more efficiently than the traditional chemical method. The results of EIS tests indicated that the coating with pores exhibited double-time constants of their impedance spectra after immersion into the corrosive solution for enough time. The coating resistance obtained by fitting the spectra with appropriate equivalent circuits is corresponded to the time constant of high frequency region and can be used to characterize the coating porosity.
  • Pulse Electrodeposition of Nano Cr/SiC Composite Coatings from Trivalent Chromium Baths in Ultrasonic Field
    HE Xin-kuai;WU Lu-ye;HOU Bai-long;LI Chen
    . 2013, 44(06): 906-910.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The nano Cr/SiC composite coatings were prepared using pulse electrodeposition method from trivalent chromium baths containing compound carboxylate-urea system and nano SiC in ultrasonic field. The effects of the pulse electrodeposition and ultrasonic parameters on the SiC content and thickness of the composite coatings were investigated, and the electrochemical behaviors of the electrodeposition nano Cr/SiC coatings in ultrasonic field were measured by electrochemical methods. These results indicated that the SiC content and thickness of the Cr/SiC composite coatings could be significantly improved due to the increasing of the electrodeposition rate of matrix chromium by the method. The surface morphology, phase composition and chemical composition of the as-posited coating was checked by the scanning electron micrographs (SEM) , X-ray diffraction and energy dispersive spectrum (EDS) analysis, respectively. The result showed the Cr/SiC composite coatings with 13.5 μm thickness and 5.5 wt.% SiC content were obtained using the technique.
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