15 March 2012, Volume 43 Issue 05
    

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    研究与开发
  • Characterization of Thermoplastic Flow Behavior for Ti-6Al-2Zr-1Mo-1V Alloy by Arrhenius Model with Variable Parameters *
    Guo-Zheng Quan;Yan-Wei Zhang;Tao Chen
    . 2012, 43(05): 545-549.
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    Abstract: The true stress-strain curves of Ti-6Al-2Zr-1Mo-1V alloy were achieved by a series of isothermal compression tests under the deformation temperatures of 1073~1323K and the strain rates of 0.01~10s-1, which would be taken as the basic data for investigating the influence of processing parameters on the fIow stress and the microstructure as well as the properties of dynamic recrystallization(DRX) and dynamic recovery(DR). The Arrhenius constitutive relation which the strain not involved was collected to developed the constitutive equation.Through adopting multivariate regression and polynomial fitting, the law of deformed activation energy Q, materials constant n, α and structural factor A on the strain was obtained,and the model of flow stress with variable parameters was established. To evaluate model, the relative error between the experimental and predicted result is calculated, and the maximum inaccuracy of the frist one is 4.77 pencent, while the maximum average is 2.19%.
  • The preparation and properties of Amino Phosphonic Chelating Fiber
    Ming-Yu Li;Hong-Guo Zhao;Qing-Xuan Zeng
    . 2012, 43(05): 550-554.
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    Abstract：The amino phosphonic fiber was prepared by the amination and phosphorization reaction of the material fibre which was prepared by polypropylene fiber grafted with styrene and then chloromethylated. For the amination reation, the effect of temperature, reaction time were examined. Orthogonal test was used to look for the best reaction condition. The results indicate that the binding capacities of the fibrous sorbent for Cu (II) was 77.6 mg?g-1 and it could absolutely separate Cu (II) and Ni (II) from hybrid solution with same concentration. Elementary analysis, infrared spectrum, scanning electron microscopy and thermogravimetry was used to investigate the properties of the amino phosphonic fiber.
  • Research of Blended Aminosilane and Borate Ester Modified Microcrystal Muscovite
    Qing Liu;Zi-Wen Hu;Min-Wei Song
    . 2012, 43(05): 555-557.
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    Research of Blended Aminosilane and Borate Ester Modified Microcrystal Muscovite LIU Jing, WANG Ling, YE Qiao-ming, HU Zi-wen (College of Materials and Chemistry, Chengdu University Of Technology, Chengdu 610059,China) Abstract: In order to better using advantages of coupling agent of aminosilane and borate ester, blended them before using on modification of powder stuffing of microcrystal muscovite, optimized the technological conditions by Orthogonal experimental design, represented the effect of modification through viscosity, mechanical property and infrared spectroscopic analysis. According to the results: Coupling agent has clad tight on the surface of powder stuffing in chemistry way; The powder stuffing of microcrystal muscovite modified by blended coupling agent can increase dispersibility and filling volume of powder stuffing in Organic medium. It can also improve impact strength and tensile strength of modified powder/polyvinyl chloride polymer composite material. In conclusion, powder stuffing of microcrystal muscovite modified by blended coupling agent can better improve process rheological behaviour of powder stuffing/ Organic mixed system. Keywords: Microcrystal muscovite;Silicane KH-550;Borate ester LD-100P;Compound modification; Mineral stuffing
  • Effect of Feed ratios of Physical and Chemical Cross-linker on Temperature-sensitivity of Hydrogel
    Qing-Song Zhang;Yang Gao;Yi-Ting Chen
    . 2012, 43(05): 558-563.
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    Physical cross-linker inorganic nanoclay Lithium magnesium silicate hydrate (LMSH) and chemical cross-linker N,N’-Methylene-bis-acrylamide(MBA) with various weight ratios were used together to prepare poly(N-isopropylacrylamide) hydrogel. With decreasing weight ratio of MBA: LMSH from 9:1 to 1:9, the transmittance and swelling degrees of hydrogel increased. When weight ratios of MBA: LMSH are 9:1 and 1:9, the hydrogels show better pulsatile responsibility upon temperature, and storage modulus at 20℃ are higher than 2.6MPa. But the hydrogel with a weight ratio of MBA: LMSH at 1:9 shows best temperature-sensitivity. The results from DSC show that the volume phase transition temperature(VPTT) of hydrogels also kept at 33℃ or so, but VPTT scope become narrow with the addition of LMSH content.
  • Effect of Oxidative Degradation Degree on the Properties of Grafted Copolymer of Starch
    Dang-Ge Gao;Wen-Ling Wu;Jian-Zhong Ma
    . 2012, 43(05): 564-568.
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    Grafted copolymer of oxidized starch and vinyl monomers was prepared using corn starch as raw material and (NH4)2S2O8 as oxidant, and it was applied in the retanning of chrome-tanned goatskin leather. The results showed that grafted copolymer with higher percentage of graft(G), higher graft efficiency(GE) and higher monomer conversion(CM) could be obtained, when the dosage of oxidant was 7.5%, the temperature of degradation was 95℃and degradation time was 30min.The grafted copolymer had retanning and filling effects, it could capture free-formaldehyde. The structure of grafted copolymer was characterized by FT-IR, TGA and XRD. They showed that vinyl monomers had grafted into the base of degraded starch successfully.
  • Preparation and photocatalytic activity of BiNbO4 nanorods
    Jie Zhao;Bing-Hua Yao;Yi-Chen Feng
    . 2012, 43(05): 569-572.
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    BiNbO4 nanorods have been synthesized by means of a simple co-precipitation method. The as-prepared products were characterized by XRD, TEM, UV-vis spectrum and TG/DTA. The photocatalytic activities of the BiNbO4 nanorods were tested by the photocatalytic degradation of Rhodamine B. Results indicate that the orthorhombic-structure BiNbO4 nanorods were prepared. Nb2O5 and Bi (NO3)3.5H2O were used as raw materials. In the photocatalytic reactor, pH=3.05, Rhodamine B could be degradation by 2 g/L-1 BiNbO4 thoroughly, which shows good photocatalytic activity. The light source, the dosage of the photocatalysts and the pH value in the solution greatly influenced the degradation rate.
  • study of aluminum-induced crystallization of polycrystalline silicon thin films by vaccum evaporation
    Zhou Wang;Jian Cao;Chuan-Qi Fu
    . 2012, 43(05): 573-575.
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    Abstract: Amorphous silicon thin films were deposited on glass substrates by vacuum evaporation then transformed into polycrystalline silicon by AIC. Grain size of the thin film was0.5-5μm, crystalline volume fraction was 89% and grain distribution was uniform. The effect of substrate distance, substrate temperature and annealing conditions on surface morphology, grain size and crystalline volume fraction was studied in this paper. The results indicated that films prepared under a certain substrate distance were more smooth and thicker. Better crystallized films were obtained at a high temperature and an appropriate annealing temperature.
  • Preparation and Characterization of helical carbon fiber by heat treatment of organic helical fibers
    Ding-Chuan Wang;Xian Jian;Jun-Yan Zhu
    . 2012, 43(05): 576-578.
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    Abstract: This paper focused on the preparation of helical carbon fibers by heat treatment of organic helical fibers in argon atmosphere at the temperatures of 400~800℃. The morphology and composition of the helical carbon fibers were characterized by SEM, XRD, FT-IR and thermal analyses. The results show that the helical morphology of the fibers remains unchanged by heat treatment of organic helical fibers under such conditions, while the chemical composition has changed. Organic helical fibers gradually change into carbon fibers based on graphitie structure when the temperature of the heat treatment increases.
  • Photoluminescence Effects of SiO2 Films After C-ion Implantation
    Chun-bao Liu;Zhi-Guang Wang
    . 2012, 43(05): 579-581.
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    Amorphous SiO2 thin films of about 0.5-1 ?m in thickness were thermally grown on single crystalline silicon. These samples were implanted at room temperature (RT) with C ions of 60, 80, 100 or 120 keV to doses ranging from 1.0?1017 to 1.2?1018 ions/cm2. The variation of photoluminescence (PL) properties of these samples was investigated at RT using a fluorescent spectroscopy. The obtained results showed that C-ion implantation led to significant changes of the PL properties and the variation of the PL properties depend strongly on the energy and doses of the C-ion implantations. For examples, huge PL peaks located at about 2.63 eV, 2.99 eV and 3.39 eV can be seen in PL spectra of sample with 120 keV C ions implanted to 1.0?1017 ions/cm2. This may imply that some micro-structures like ?Si-Si? defects were induced in a-SiO2 films after C-ion implantations. It seems that special light emitters can be produced by using proper ion energy and implantation doses, which is a very useful way for synthesis of new type of SiO2-based light-emission materials.
  • Influence of different reinforcement on performance of SiC coating
    Yang Chen;Cheng-Guo Wang;Wei Zhao
    . 2012, 43(05): 582-586.
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    SiC coating was prepared by three technologies on graphite with the purpose of optimizing the phase structure and researching the performance of antioxidant coating. The weight loss of different samples oxidated at 1400℃ for 10h was tested. The surface and cross-section morphology images of the coating before and after oxidation were analyzed by scanning electron microscopy (SEM). Phase structures were analyzed by X-ray diffraction (XRD). The research indicates that the coating shows better oxidation resistance by introducing SiC whiskers and MoSi2 at the same time, with the weight loss below 1% after oxidation at 1400℃ for 10h. The SiC whiskers can effectively decrease the crack of the coating in the oxidation process, and avoid the excessive penetration of silicon to protect the matrix from being excessively corrosion. Adding MoSi2 and Mo, the coating shows much better oxidation resistance and self-healing ability.
  • Research on improve production technology for performance of Organic Solid-electrolyte Tantalum Capacitor
    Shuang Xia;Jian-Hua Xu;Ya-Jie Yang
    . 2012, 43(05): 587-589.
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    In this paper, optimal fabrication process of cathode film deposition for polymer cathode tantalum capacitor was investigated. The influence of surface active treatment of Ta2O5 film and the doping of polymer film on capacitor electrical performance, such as capacitance, anti-voltage endurance ability, and equivalent series resistance (ESR) were investigated in detail. The results showed that better matching between Ta2O5 film and PEDOT polymer layer occurred after an active treatment of Ta2O5 surface, which resulted in an improved extraction capacitance of tantalum capacitors. It was also found that an addition of isolated layer (BEST layer) between Ta2O5 film and PEDOT polymer layer can prevent the impurity ion from penetrating into Ta2O5 film effectively, and the obtained tantalum capacitor exhibited better anti-voltage endurance ability. Moreover, the results showed that a 3% of mass ratio of doping solution and a repairing voltage to Ta2O5 film-forming voltage about 70% can effectively reduce the ESR and leakage current of obtained polymer cathode tantalum capacitors.
  • Research on the Bioactivity of Ta-doped TiO2 Film
    Rui Zhai
    . 2012, 43(05): 590-594.
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    Ta-doped TiO2 films were deposited on surface nano-grained 316L stainless steel by RF reactive magnetron sputtering technology. The morphology, structure, hydrophilic ability and bioactivity of TiO2 films with different doping density of Ta deposited on surface nano-grained 316L stainless steel were researched. The results show that the certain doping density of Ta can refine the grains of TiO2 film;Ta-doped TiO2 films deposited on surface nano-grained 316L stainless steel have better hydrophilic ability and bioactivity; The surface free energy of TiO2 film with 36% Ta-doped increased 30.1dyn.cm-1;TiO2 film with 36% Ta-doped can promote the crystallization of hydroxylapatite on TiO2 films soaked in simulated body fluid.
  • Preparation and Performance of Cellulose Acetate Forward Osmosis Membrane
    Li-Li Li;Duo Wang
    . 2012, 43(05): 595-598.
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    Forward osmosis membrane was fabricated by phase inversion method, with Cellulose acetate (CA) as membrane material and polyester mesh as support. The effects of polymer content in polymer solution, humidity, and the temperature of coagulate bath and annealing on the membrane performance (the water flux and the rejection for NaCl ) were investigated.The results show that the above factors play an important role on the performance of the FO membrane. When the CA concentration is 10.4%, with annealing temperature 60℃, gel bath temperature 15℃ and humidity 90%, the water flux of the fabricated FO membrane was between 9.7 and 10.3L/m2h and the rejection for NaCl was more than 93%, using 0.1 mol/L NaCl as the feed solution and 4 mol/L glucose as the draw solution.
  • Study on the simultaneous adsorption of CTMAB-HTCC bentonite towards aniline and Cd2+
    Rui-Hua Huang;Bo Wang;Dong-Sheng Zheng
    . 2012, 43(05): 599-602.
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    CTMAB-HTCC bentonite was prepared using bentonite modified with cetyltrimethyl ammonium bromide and quaternized chitosan. This organo-bentonite was applied in the simultaneous adsorption of CTMAB-HTCC bentonite towards aniline and Cd2+ from aqueous solution. During the experiments, the effects of pH, absorbent dosage, adsorption time, the initial concentration, etc on adsorption were all discussed. The results show that CTMAB-HACC bentonite effectively removes aniline and Cd2+ from aqueous solution simultaneously. The main adsorption mechanisms for aniline and Cd2+ are partitioning effect and chelation action, respectively. The presence of Cd2+ has no influence on the adsorption of aniline, while the presence of aniline can improve the adsorption of Cd2+ onto CTMAB-HACC bentonite.
  • Microwave Reflective Properties of Blended Fabric with Stainless Steel Fiber and Polyester Fiber
    Zhi-yong Jai;
    . 2012, 43(05): 603-606.
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    The Microwave Reflectivity effectiveness of blended fabric with stainless steel fiber and polyester fiber was tested and studied in this paper. The result shows that the content of stainless steel fiber plays an important role in the microwave reflectivity effectiveness. Many factors which affect the Reflectivity properties were analyzed. This will help to develop and design this kind of functional fabric.
  • Vertically cobalt nanoplate arrays based on one-step electrochemical growth and their magnetic properties
    Li-Xia Xu;Shi-Chao Zhang;Wen-Bo Liu
    . 2012, 43(05): 607-610.
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    Abstract: Cobalt nanoplates array standing vertically on the copper substrate have been prepared by using ammonium citrate dibasic as complexing agent via one-step electrodeposition method without any template. The morphology, crystal structure, and composition of cobalt nanoplates were characterized by SEM, XRD, EDX and. In addition, effects of complexing agents, addition of ammonium citrate dibasic and crystal growth time on morphology of the products were investigated. Owing to the interesting 3D nanostructures, remarkable magnetic anisotropy is found on the cobalt nanoplates. The easy axis of magnetization is parallel to the substrate plane and a distinct enhanced ferromagnetism was exhibited while perpendicular to the copper substrate.
  • Light-induced Reversible Changes of the Surface Energyof Side-chain Liquid Crystalline Polymer Film
    Yuan-Yuan LIi;
    . 2012, 43(05): 611-613.
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    Abstract： Light-induced orientation and disorientation of an azobenzene containing side-chain liquid crystalline polymer Poly (5 - [4 - (4’- cyano-azobenzene) phenoxy] pentyl methacrylate) were conducted on a solution-cast film. When exposed under a vertical Linearly Polarized Light (LPL) at 473 nm, in-plane orientations of the mesogens were induced and were confirmed by the POM observations under conoscopic and orthoscopic illuminations. The contact angles of a drop of water on the different orientated films were measured of 71.8° and 86.4° on the non orientated and orientated film, respectively. The disorientated film was obtained by irradiated the orientated film upon exposed with a 365 nm UV-light. The contact angle of a drop of water on the disoriented film is 72.3°. The surface energy of thin film was further calculated according to the measured contact angles, which reversibly varied between 40.1mJ/m2 and 30.8mJ/m2.
  • Effect of thixotropy on tribological properties of magnetorheological fluid
    Zhi-De Hu;Hua Yan;Xue-Mei Wang
    . 2012, 43(05): 614-617.
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    The influence of the types and contents of thixotropies on tribological properties of methyl silicon oil-based magnetorheological(MR) fluids were investigated on a four-ball tribological tester. The effect of thixotropy on friction coefficient and wear scar diameter was discussed. And the morphologies of the wear steel surfaces lubricated with MR fluids were observed by a scanning electron microscope. It was found that the wear properties of SiO2 –based MR fluids were better than that based on kaolin. The friction coefficient of MR fluid increased with the increase of SiO2 contents. The lowest wear scar diameter could be obtained when the weight percentage of SiO2 was 1%. The wear mechanism of methyl silicon oil-based MR fluids was three body abrasions, the thixotropies did not affect the wear patterns, but they could improve wear performance of the MR fluid.
  • The study on separation and purification of apigenin using collagen fiber adsorbent
    Qi-Xuan Zhang;Wen-Hua Zhang;Xue-Pin Liao
    . 2012, 43(05): 618-621.
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    Collagen fiber, cross-linked by glutaraldehyde, was used as an adsorbent for the chromatographic separation and purification of apigenin from the mixture of flavonoids of apigenin, quercetin and myricetin. It was found that the collagen fiber adsorbent shows difference on adsorption ability to apigenin, quercetin and myricetin. The adsorption capacity of apigenin is relatively lowest. Apigenin could be well separated from the mixture by stepwise elution using 100%-70% aqueous ethanol solutions, and its purity was 98.03% and the recovery extent was 100%. While the apigenin and quercetin could be separated from the mixture system by stepwise elution using 40%-60% aqueous ethanol solutions, and their purity was 99.16% and 99.47%, and the recovery extent was 100% and 91.22%, respectively. It was also found that increasing the column heignt is helpful to improve the purity of apigenin. In addition, the separation capability of collagen fiber adsorbent was not obviously reduced after 5 times of repeated applications, exhibiting good reusability. Therefore, the collagen fiber adsorbent can be used for the effective separation and purification of apigenin from the mixture of flavonoids.
  • Friction and wear properties of carbon/epoxy resin composite materials derived from artificial sponges
    Di ZHANG
    . 2012, 43(05): 622-625.
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    Artificial sponges were used as templates, by infiltrating phenolic resin and epoxy resin, polymer matrix composites with sponge-like network were made. Microstructures and friction wear properties were studied on the composites. The wear rates of the composites are shown to be lower than that of the epoxy resin. The composites also exhibit a lower coefficient of friction compared with epoxy resin, and the coefficients of friction of the composites changed in a more narrow range than that of the epoxy resin. These results demonstrate a more stable friction state for this type of composite.
  • Preparation and Properties of MnZn Ferrite Precursor Powders by Chemical Co-Precipitation
    Jing-Bing Xia;Jian-Qing Dai;Guo-Fu Li
    . 2012, 43(05): 626-629.
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    According to the latest thermodynamic data, the thermodynamic analysis of different Me ions (Me=Fe2+、Mn2+、Zn2+) on the system of Me-NaOH-H2O had been carried out. Then, MnZn ferrite precursor powder was prepared by using co-precipitation. Then the precursor was studied by XRD and SEM, and the temperature of calcination is analyzed by TG-DSC. The vibrating sample magnetometer (VSM) was used to investigate the magnetic properties. It shows that the Me ions can co-precipitate in Me-NaOH-H2O system at pH value of 10.0~10.7. On this basis, the MnZn ferrite precursor powders with spinel structure were obtained directly, which can solve the difficult issue in washing process. The magnetic investigation indicates that the specific saturation magnetization σs, the retentive magnetism σr, and coercive force Hc of the precursor power are 64.09 A?m???2?kg-1, 3.08 A?m???2?kg-1 and 0.51 A?m-1 respectively.
  • Effect of Cu/Sn ratio on the Physical properties of Cu2SnSe3 thin films
    Wei Zhang;Shun-Li Chen;Yuan Wang
    . 2012, 43(05): 630-634.
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    Cu-Sn preeursors deposited using RF magnetron co-sputtered technique onto glass substrates. Then the Cu2SnSe3 thin films with Cu/Sn ratio in the range 1.87-2.22 were obtained by selenizing the Cu-Sn preeursors in the atraosphere of Se vapor. The influence of the variation of Cu/Sn molar ratio from1.87 to 2.22 on the particle morphology, crystal structure and optical properties of Cu2SnSe3 samples was studied. Powder X-ray diffraction(XRD) patterns reveal that Cu2SnSe3 films deposited with Cu/Sn ratio in the range 1.87-2.22 are found to cubic crystal structure with a (111) preferred orientation. Band gap of the films is found to increase in Cu-poor, but unchanged in Cu-rich. Electrical resistivity of the films is found to lie in the range 1.67-4.62m -cm depending on Cu/Sn ratio.
  • Hydrothermal Synthesis Of One Dimensional GdV1-xPxO4:Tm Nanomaterials And Their Luminescent Properties
    Ni Li;Wei—Gang Huang
    . 2012, 43(05): 635-637.
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    One dimensional GdV1-xPxO4:Tm blue luminescent nanomaterials with larger length-diameter ratio were successfully synthesized by hydrothermal method with Ethylenediamine tetraacetate（EDTA） as template. The phase structure, morphologies and luminescence properties of GdV1-xPxO4:Tm were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy(PL). The results show that the products are all one dimensional. As the molar ratio of doping P(x) increasing,the nanorods become more slender and their length-diameter ratio gets larger.Without calcination, the products emit bright 478nm blue fluorescence when excited by 278 nm ultraviolet radiation and the phosphor has the optimal property when x=0.4.
  • Preparation of Modified Silica Membranes by KH-570 and Separation on CH4/CO2
    Wen-Xiu Li;Bing Zhang;Li-Feng Chen
    . 2012, 43(05): 638-641.
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    Hydrophobic silica gas separation membranes were prepared by acid catalysed co-hydrolysis and condensation reaction of tetraethylorthosilicate (TEOS) and γ-methacryloxypropyltrimethoxysilane (KH-570) in ethanol, characterized by IR, DTG , SEM, contact angle measuring instrument, and studied by CH4 / CO2 gas permeation and separation. The results indicated that the contact angle was 94.2°of modified membrane and the unmodified membrane was 28.6°. The hydrophobicity of modified membrane enhanced by test with Infrared spectrum. (0.8KH-570) Silica membrane was remarkable integrated and hydrothermally stable until 400℃. As the pressure was 30KPa , the CH4 / CO2 separation factor increased within 5 dip-coating times and it decreased afterwards. The separation factor was 2.13 at five dip-coating times, which was larger than the ideal separation factor (1.66) by Knudsen diffusion and the separation performance was the best. For silica membrane at five dip-coating times, methane permeation displayed increase nonlinear with the relative pressure rising. But the CH4 / CO2 separation factor hardly had any change.
  • Microstructure and Properties of PSA-g-MWNT Reinforced PVA/PSA Blend Membrane
    Fei-Peng Du;Jing-Jing Wang;En-Zhou Ye
    . 2012, 43(05): 642-644.
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    Poly (sodium 4-styrenesulfonate-co-acrylic acid) grafted carbon nanotubes (PSA-g-MWNT) reinforced polyvinyl alcohol (PVA)/PSA blend membrane was prepared via solution casting and chemical crosslinking. This paper focuses on the influences of modified MWNT on the microstructure, mechanical properties, electrical conductivity, ion-exchange capacity and water uptake of the blend membrane. The results show that the polymer matrix membrane exhibits optimum comprehensive properties while the weight ratio of PVA and PSA is 2:1. PSA grafted onto the surface of MWNT improves the compatibility between MWNT and PVA/PSA matrix, which makes MWNT toughen and reinforce PVA/PSA blend membrane simultaneously. With increasing PSA-g-MWNT content, the electrical conductivity of blend membrane increases significantly and the IEC exhibits a rising trend.
  • Fabrication and Characterization of Superhydrophobic Films on Steel Substrate
    Sheng-Song Ge;Juan Li;Xian Shao
    . 2012, 43(05): 645-649.
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    Superhydrophobic films were prepared on steel substrate using hydrothermal method combined with modification of fluorinated silane. The hydrophbility of hydrophobic films is related to the micro-nano fine structures of the steel substrate. The results showed that octahedron-like, flower-like micro-nano hierarchical structures had grown on steel surface, which were fabricated by hydrothermal reactions in an ethylenediamine solution at 140℃ for 4h as well as at 160℃ for 5h. After modified by fluorinated silane, the treated surface exhibited superhydrobicity with water contact angles of 156.49°and 165.31°, respectively. The result of X-ray diffraction pattern indicated that the main component of the micro-nano structure was Fe3O4. The formation of Fe3O4 provides micro-nano fine structures that is necessary to prepare hydrophobic surface, and provides conditions which tight films were formed by reacted with fluorinated silane. Electrochemical tests showed that the anti-corrosion property of steel was improved effectively by the superhydrophobic films.
  • Electroplating n-ZrO2/Ni composite coatings on AZ91D magnesium alloy and corrosion resistance
    Yan Liu;Guo-Long Lu
    . 2012, 43(05): 650-652.
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    n- ZrO2 /Ni composite coatings were prepared by electrodeposition on AZ91D magnesium alloy surfaces which was plated by Ni-P. The surface morphology, section morphology and corrosion resistance of the composite coatings were compared and analyzed. The results showed that the n- ZrO2 /Ni composite coatings were more compact and smooth and its grains were smaller than pure Ni coatings. The n- ZrO2 /Ni composite coatings had an evident passivation region and showed excellent corrosion resistance.
  • Effect of Surface Crosslinking on Absorption Properties of SuperAbsorbent Polymers
    Liang-Pei Zhang;Wei-Ying Zhang;Xiao Li
    . 2012, 43(05): 653-656.
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    Isocyanates, aldehydes and metal salts were applied as surface crosslinking agent for superabsorbent polymers prepared by solution polymerization of acrylic acid. The results showed that the superabsorbent polymers treated by formaldehyde possessed good properties, including high absorption speed, easy dispersion in aqueous solution, dry surface of the gel after absorption, pretty absorbency under pressure, and simple surface treating process. When 5g superabsorbent polymers was treated with 0.1g formaldehyde for 12 hours at room temperature, the SAPs got the optimum performance.
  • Electrochemical Performances of Si/Graphite/Carbon Composites as Anode Materials for Lithium-ion Batteries
    Peng QI; Ding Zhu;Yun-Gun Chen
    . 2012, 43(05): 657-659.
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    The Si/Graphite/Carbon composites were prepared through wet milling technique followed by pyrolysis method in this work. The phase structures, electrochemical performances and kinetics of the as-prepared composites were analyzed respectively. The effect of different components ratio on cycling performance was investigated specially. The results showed that the composites consisted of 20 wt.% Si and 30 wt.% graphite exhibited the best overall performances, in which the first reversible capacity was up to 865 mAh g-1 with coulomb efficiency of 69%, and the capacity retention after 30 cycles was 88%.
  • Synthesis and Electrochemical Characterizations of Mg-doped LiFePO4/C by Carbothermal Reduction
    Tu-Tao Song;Su-Xia Wu;Xue-Fang Zheng
    . 2012, 43(05): 660-664.
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    Composites Li1-xMgxFePO4/C (x=0.00,0.01,0.02,0.03,0.04,0.05,0.1) were synthesized by carbothermal reduction method. The samples were characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM), and their electrochemical performances were investigated by analyses of cyclic voltammetry(CV), electrochemical impedance spectra(EIS) and constant current charge-discharge experiment. The results indicate that the low concentration Mg dopant does not affect the structure of LiFePO4 but considerable improves its electrochemical performances. The Li0.98Mg0.02FePO4/C materials showed better electrochemical performances than LiFePO4. At 0.1C discharging rate, it is capable of delivering reversible specific capacity of 165.2mAh?g-1, with fairly stable cycleability. In addition, FT-IR spectroscopic studies for these materials were carried out and the vibrational bands were assigned.
  • Synthesis and luminescence properties of GdAlO3:Eu3+
    Xin-Zhong Li;Zhao-Gang Nie;Yu-Ping Tai
    . 2012, 43(05): 665-668.
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    The GdAlO3:Eu3+ phosphor was synthesized by high temperature solid state reaction in air and in reduction atmosphere. The influences of color centers on the red fluorescence intensity, decay time, excitation spectra and position of O2--Eu3+charge transfer band (CTB) are studied. After annealing, the intensity of GdAlO3:Eu3+ is enhanced greatly, and the position of O2--Eu3+CTB was recovered. Based the effects of sintered temperature and atmosphere on color centers, a two step synthesis route is proposed to effectively eliminate color centers and obtain high fluorescence intensity.
  • Preparation of Hollow Silica Microspheres Using P(St-EA-MAA) as Template
    . 2012, 43(05): 669-672.
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    P(St-EA-MAA) microspheres with different size were synthesized by seed emulsion polymerization of styrene (St), ethyl acrylate ester (EA) with methacrylic acid (MAA). The P(St-EA-MAA)/SiO2 composite microspheres were prepared by using γ-aminopropyl trimethoxysilane (APS) and tetraethyl orthosilicate (TEOS) as co-structure-directing agent and silicon sources in the presence of the P(St-EA-MAA) microspheres as template, hollow silica microspheres were obtained by removing the P(St-EA-MAA) templates based on calcination. TG analysis shows that the proper temperature for template removal is 600℃. High resolution transmission electron microscopy (HRTEM) results show that silica microspheres are monodispersed with hollow structure, and the diameter of hollow silica microspheres can be adjusted by the size of the P(St-EA-MAA) microspheres. N2 adsorption-desorption isotherms show that the internal surface of hollow silica have rich micropores, and the BET specific surface area, average pore diameter and volume of pores is 117.87 m2/g, 1.98nm and 0.21cm3/g, respectively. The introduction of CTAB can change the thickness and structure of the silica shell, and the BET specific surface area, average pore diameter and volume of pores could be increased to 219.79 m2/g, 3.89nm and 0.25cm3/g.
  • Study on an Cr-Co-Ni-Mn austenitic stainless steel for cavitation erosion
    Qiang Liu;Bo Li;Xi-Zhang Chen
    . 2012, 43(05): 673-676.
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    An Cr-Co-Ni-Mn austenitic stainless steel was self-produced. The properties of its cavitation erosion in comparison with 304 stainless steel was studied. Microstructure of Cr-Co-Ni-Mn austenitic stainless steel was observed by TEM after cavitation erosion. The strength of this material was measured, the structural stability after aging was analyzied. The results reveal that Cr-Co-Ni-Mn austenitic stainless steel has higher strength, and longer incubation time than 304 austenitic stainless steel during cavitation erosion. The austenitic microstructure of this material is more stable. The strainε-martensite were produced during cavitation erosion, and the structures transformation absorbs shock energy. These exhibt improved cavitation erosion resistance, it can be used in the cavitation field.
  • Deposition Parameters of RF Sputtered High-Quality ZnO films
    Huo-Quan Li;Xiang-Hua Zeng;Jiu-Rong Han
    . 2012, 43(05): 677-680.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Undoped ZnO films were deposited on(100)silicon substrate by radio frequency magnetron sputtering at room temperature. The properties of the films were examed by X-ray diffraction(XRD) and scanning electron microscope(SEM).The effects of deposition parameters on the growth rate of ZnO films have been investigated.The dependence of crystalline of the films on the growth rate and O2/Ar flow rate during the deposition is analysed as well. The results show that the growth rate of the deposited films is mainly determined by RF power and the reactive gas pressure,the crystallinity of ZnO films is mainly determined by the growth rate of the films and O2/Ar flow rate during the deposition.The best deposition parameters of RF sputtered high-quality ZnO films are as follows:the distance between the substrate and the target is 40mm,zhe sputtering power is 250W,zhe flow rate ratio of Ar:O2 is 5:20,the reactive gases pressure is 2 Pa.Films with high transparency of 90%,higy c-axis orientation,continucous and dense morphology have been achieved at the best deposition parameters.
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