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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Influence of Electrophoretic Deposition Voltage on the Phase, Microstructure and Property of a Nano-SiC Coating

    Wang BoHuang Jian-FengLiu MiaoCao Li-Yun...
    489-491页
    查看更多>>摘要：In order to improve the oxidation resistance of carbon/carbon (C/C) composites, a nano-SiC (SiC_n) coating for SiC pre-coated C/C was prepared by a hydrothermal electrophoretic deposition process. The phase compositions, surface and cross-section microstructures of the SiC_n coatings deposited at different voltages were investigated. XRD and SEM analyses show that SiC_n outer layer without penetrative holes and cracks can be achieved at the deposition voltage range from 120 V to 210 V. The thickness and density of the SiC_n coatings improve with the increase of deposition voltage. The multi-layer coatings deposited at 210 V can effectively protect C/C composites from oxidation in air at 1773 K for 202 h with a weight loss of 0.79%.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Deposition Kinetics of the Cristobalite Aluminum Phosphate Coating on SiC Coated Carbon/Carbon Composites Prepared by Hydrothermal Electrophoretic Technique

    Yang Wen-DongHuang Jian-FengCao Li-YunZeng Xie-Rong...
    492-495页
    查看更多>>摘要：Cristobalite aluminum phosphate (C-AlPO_4) coatings were prepared by hydrothermal electrophoretic process on SiC coated C/C composites at different temperatures. The as-prepared C-AlPO_4 coatings was characterized by SEM analyses. The influence of hydrothermal deposition temperature on the microstructures of the as-prepared coatings and the deposition kinetics mechanism were investigated. Results show that dense and homogeneous C-AlPO_4 coatings on SiC coated C/C composites can be achieved at 373K and 220V deposition voltage; Kinetics investigations show that the deposition process of the C-AlPO_4 coatings on SiC coated C/C composite is controlled by the diffusion rate of the charged C-AlPO_4 particles to the cathode; the deposition rate increases with the increase of hydrothermal temperature. The diffusion equation and the kinetic expression of coating process follow the Fick's second law and Ahrennius relationship. The deposition activation energy of the C-AlPO_4 coatings fabricated by the hydrothermal electrophoretic process is calculated to be 21.88kJ/mol.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Fabrication of Superhydrophobic Surfaces of Titanium Dioxide and Nickel Through Electrochemical Deposition on Stainless Steel Substrate

    Yawei HuShan LiuSiya HuangWei Pan...
    496-498页
    查看更多>>摘要：Binary microstructures at both micro- and nano-scale are constructed by the electrochemical depositing Ni and TiO_2 on the stainless steel surface. Superhydrophobicity is achieved with a water contact angle greater than 150° after modifying the textured surface with fluoroalkylsilane (FAS-17, CF_3(CF_2)_7CH_2CH_2Si(OCH_3)_3). The morphology of the Ni-TiO_2 compound coating is studied by scanning electron microscopy.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Characterization of Silicon Carbide Grown on RB-SiC by Chemical Vapor Deposition

    Meng FantaoDu ShanyiTian GuishanZhang Yumin...
    499-501页
    查看更多>>摘要：Silicon carbide is one of the best materials for satellite mirror and chemical vapor deposition (CVD) is an effective method of preparing SiC whiskers and films. In this paper, SiC whiskers or films were deposited on substrates of RB-SiC in an upright chemical vapor deposition furnace of Φ150mm × 450 mm with methyltrichloride silicane (MTS) as precursor gas and H_2 as carrier gas under dilute gases of different W_2/Ar ratio and different deposition temperature between 1050℃ and 1150℃. The morphology and composition of the CVD-SiC grown on RB-SiC substrate were determined by scanning electron microscope (SEM) and X-ray diffraction (XRD) respectively. As a result, whisker-like, worm-like or ball-like SiC can be respectively obtained dependent on different deposition conditions such as H_2/Ar ratio and deposition temperature, and the composition of the productions are determined as β-SiC by XRD. Furthermore, the deposition mechanisms of different morphologies of SiC are introduced.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Preparation of Hydroxyapatite/Chitosan Biological Coatings on Carbon/Carbon Composites

    Li Ying-HuaCao Li-YunHuang Jian-FengZeng Xie-Rong...
    502-505页
    查看更多>>摘要：Hydroxyapatite/Chitosan (HAp/CS) bio-coatings were prepared on the surface of carbon/ carbon (C/C) composites by hydrothermal electrophoretic deposition, using sonochemical process resulted HAp nanoparticles, isopropyl alcohol and chitosan as raw materials. The influences of hydro-thermal conditions and deposition voltage on the microstructures and morphologies of the as-prepared coatings were investigated. It was shown that homogenous and dense HAp/CS coatings on C/C composites are obtained by hydrothermal electrophoretic deposition. With the increase of deposition voltage, density and homogeneity of the as-prepared HAp/CS composite coatings are well improved. Due to the growth of HAp nanoparticles in the hydrothermal condition, the subsequent heat treatment of the HAp/CS coatings is not needed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Influence of Annealing Temperatures on the Properties of Dual-Layer W-TiO_2 Thin Films

    Chia-Cheng HuangFang-Hsing WangCheng-Fu YangHong-Hsin Huang...
    506-509页
    查看更多>>摘要：W-TiO_2 (W, tungsten) dual-layer thin films are deposited by RF magnetron sputtering onto glass substrates and annealed at 150℃～400℃ for 4hrs. The crystal structure, morphology, and trans- mittance of annealed W-TiO_2 dual-layer thin films are investigated by X-ray diffraction, FESEM, and UV-Vis spectrometer, respectively. The annealing temperatures have large effect on the properties of W-TiO_2 dual-layer thin films. The band gap energy values of W-TiO_2 dual-layer thin films are evaluated from (αhv)~(1/2) versus energy plots. The energy gap for un-annealed W-TiO_2 dual-layer thin film is 3.16 eV. As the annealing temperature increases from 150℃ to 400℃, the energy gap decreases from 3.16 eV to 3.10 eV.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Characteristic of Palladium Coated Tubular Alumina Composite Membrane for Hydrogen Separation

    Mettaya KitiwanDuangduen Atong
    510-513页
    查看更多>>摘要：The palladium membrane has been developed for high temperature separation of hydrogen from other syngas molecules. In this study, tubular α-alumina substrate was used as a support for increase mechanical strength for thin palladium membrane. Prior depositing of palladium film, a dip-coating of palladium nuclei was performed to cover the substrate. Afterward, surface of activated support was modified with a thin intermediate layer for improving adhesion between support and Pd membrane. Electroless plating of dense palladium membrane was achieved from the plating bath containing EDTA stabilized palladium complex and hydrazine. The microstructural characteristics of palladium membranes were analyzed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Study of Different Sintering Routes on Properties of Ni-Al_2O_3 Hydrogen Separation Membrane

    Supawan VichaphundDuangduen Atong
    514-517页
    查看更多>>摘要：This work aimed to investigate the effect of different sintering routes on properties of Ni-Al_2O_3 membrane. Alumina powder was mixed with 10 wt% nickel powder by dried ball-milling. Then, the mixture powder was uniaxially pressed to a bar shape and sintered via different sintering conditions. First route, the M-Al_2O_3 specimen was sintered at 1300℃ for 2 h under air and then reduced at 900℃ for 2 h under H_2 atmosphere. Second route, the specimen was sintered at 1300℃ for 2 h under argon. After sintering process, the physical and mechanical properties of membrane obtained from two routes were compared and discussed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Preparation and Characterization of Different Composition Mg-Cu Tapes

    Jun LiGuo-Qiang LuoQiang ShenLian-Meng Zhang...
    518-521页
    查看更多>>摘要：Tape casting was used for the preparation of Mg-Cu systems density graded materials. A series of tapes with uniform compositions ranging from 100wt% Cu to 100wt% Mg were fabricated with sufficient strength to be handled during the post-processing stage. The effect of the tape casting process parameters on the properties of the tape were studied, such as the composition of the Mg-Cu and the solid loading. The rheology of the slurry of different Mg-Cu composition for tape casting was characterized by viscosity. The tapes characterized by microstructure, thickness and bulk density were outlined. The results demonstrated that the different Mg-Cu composition slurry with well-dispersed, high stability, certain solid loading from 45～70 wt% were obtained. The viscosity of the slurry and the density of the green tapes were increased with the increasing of the content of Mg. The thickness of tapes of compositions ranging from 100wt% Cu to 100wt% Mg with certain strength could be achieved 68-110μm and the density of the tapes was 0.74-2.42g/cm~3. For 100wt% Cu tapes, when the solid loading was 68wt%, the high density tape was produced. The tapes with different thickness, density and different Mg-Cu compositions were obtained.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Preparation of Electroless Ni-Mo Coated TiC Powder

    Peng WuYong ZhengQuan YuanYu Haizhou...
    522-525页
    查看更多>>摘要：Ni-Mo coated TiC powders were prepared by electroless plating technique assisted by ultrasonic wave with hydrazine as reducing agent. The surface microstructure of the Ni-Mo coated TiC powders was characterized with scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffractometry (XRD). The results showed that the as-plated powders, which were of nearly spheric shape, were the composite of TiC and Ni-Mo alloy. The Ni and Mo elements were uniformly distributed around the TiC powders with some plating leakage. In addition, the Ni-Mo plated thin layers on the surface of TiC powders were amorphous or microcrystalline in a supersaturated state. Diffraction peaks corresponding to Ni and Mo weren't found, and the Ti (NO_3)_4 and an unknown phase were formed as the load decreased from 15 g/L to 5 g/L.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd