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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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    Preparation of Zinc Oxide Whisker on Carbon Fibers

    Hu ZhangLing WangJian-Feng TongXiao-Su Yi...
    790-792页
    查看更多>>摘要：A process is adopted to grow whiskers on carbon fibers. The whisker growth is carried out in a two-step process. Plasma spraying, electroplating and magnetron sputtering are used to pretreat the surface of carbon fibers and then ZnO whiskers are grown by hydro thermal method. By comparing three different methods of surface pretreatment, it is concluded that magnetron sputtering is most available and has no damage to the carbon fibers. Combining preparation method of the ZnO whiskers, a new process is developed to surface modified of carbon fibers which is expected apply to carbon fiber composites.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Comparative Analysis of Adding Hydrogen Peroxide or Ethanol in Preparation of Zirconia Nano-Powder by Coprecipitation Methods

    Wang KaijunHu JinWang HuaLiu Jian Liang...
    793-795页
    查看更多>>摘要：Zirconia precursor was prepared by adding hydrogen peroxide or ethanol in co-precipitation process from raw materials of ZrOC_(12)·8U_2O and ammonia, the zirconia powders were subsequently obtained by calcination of the precursor at 600℃ and ball milling. Through the analyzed by TG-DTA, XRD, SEM, the results show that by adding hydrogen peroxide or ethanol in co-precipitation process can reduce the produce of agglomerate. Ethanol and hydrogen peroxide addition on zirconia by co-precipitation for different reaction results were compared and analyzed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Microwave Absorption Properties of Nano-iron Epoxy Resin-based Composite Material

    Xiaoyang GongJinghan YouZhen ZhangLeilei Yang...
    796-798页
    查看更多>>摘要：A novel nano-iron participate reinforced polymer-based composite material against electromagnetic pollution was prepared for household appliances. The attenuation, permittivity and various absorbing aspects of the composite materials were investigated. Results indicated that the composite materials exhibit promising effects of microwave absorption. The attenuation was affected by volume fraction of nano-iron powders. A single microwave absorption medium won't be appreciable, and a combination of different microwave absorption materials is suggested.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis of Fe-core/Au-shell Nanoparticles Under Ambient Pressure

    Shi-Mian ChaoTeen-Hang MeenWen-Ray ChenKuen-Hsien Wu...
    799-802页
    查看更多>>摘要：Pure metal iron nanoparticles are unstable in the air. By a coating iron on nanoparticle surface with gold, these air-stable nanoparticles are protected from the oxidation and retain most of the favorable magnetic properties. However, it is difficult to prepare Fe-core/Au-shell (Fe@Au) nanoparticles under ambient pressure because iron nanoparticles are very easily to be oxidized in the air. In this study, we synthesized Fe@Au nanoparticles by modified reverse micelle method under ambient pressure and investigated them by X-ray diffraction, transmission electron microscopy (TEM), ultraviolet-visible absorption spectra, and magnetic susceptibility measurements. X-ray diffraction analysis shows that the pattern of iron is hidden under the pattern of gold. TEM image reveals that the core-shell structure is obviously observed and the average size of Fe@Au nanoparticles is about 12 nm, with about 8 nm diameter core and 2 nm shell. The absorption band of the Fe@Au nanoparticles shifts to a longer wavelength and broadens relative to that of the pure gold. The magnetic susceptibility of Fe@Au nanoparticles is measured with a SQUID magnetometer and found to be superparamagnetic with a blocking temperature Tb～25 K.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    First-Principles Study on the Three-Dimensional Structure of Graphane

    Weiwei JuHui WangTongwei LiZhenya Fu...
    803-804页
    查看更多>>摘要：Four kinds of three-dimensional structure of graphane are investigated using first-principles method. It is found that the energy of four different structures has little difference, so the conclusion can be drawn that the four structures are likely to exist synchronously in experiments.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Luminescent Properties of Eu~(3+)-doped HfO_2 Powders Prepared by Combustion

    Jing MengDanyu JiangQiang Li
    805-807页
    查看更多>>摘要：Scintillators are ideal candidates used in detectors for X-ray ,γ-ray and high energy ray , and have been widely applied in nuclear medicine , high energy physics ,geologic survey , security inspection and material flaw detection. The high density of HfO_2 is an attractive compound for host lattice activated by rare earth for applications as scintillating materials. This paper reported the synthesis of Eu~(3+) doped HfO_2 nanopowders by chemical self-combustion method at low temperature. Analytical grade Eu(NO_3)_3 and high pure HfOCl_2 were used as raw materials. The requisite amount of urea and glycine as the mixed fuel were added to the mixed solution. A little EDTA was used as a complexant. The mixed solution was dried at 200℃, and fired at 450℃. The powders synthesized by self-combustion were then calcined at 800℃ to profit the crystal growth and improve the luminescent properties. XRD, TEM were employed to analyze the phase composition and the characteristics of as-obtained powders. The TEM images display typical nano-structured morphology of Eu~(3+) doped HfO_2. Analysis of XRD indicates that Eu~(3+) doped HfO_2 nanopowders are cubic phase. The excitation and emission spectra were analyzed by the fluorescence photometer. There are two peaks in emission spectra .One is at 595nm, and another is at 614nm. The luminescent properties also reveal the structure of cubic phase.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Finite Element Modeling of Temperature Distribution in Spark Plasma Sintering

    Cao WangZhe ZhaoLaifei Cheng
    808-813页
    查看更多>>摘要：A finite element model (FEM) is developed to simulate the temperature distribution in the sample/die/punch assembly during the spark plasma sintering (SPS) process. A thermal-electrical coupled model with temperature dependent thermal and electrical properties is implemented. The simulation studies were conducted using COMSOL and a range of heating-rates and die sizes were considered. Also, both temporary and equilibrium condition during heating process were evaluated in order to express the real temperature development in the sintering. During the spark plasma sintering process, the temperature difference between the sample center and the die surface depend on the heating-rate and die size. The simulation results also revealed that the temperature gradient during the heating process is much bigger than that in the dwelling period. It is necessary to consider the temporary state during the spark plasma sintering process in order to guarantee a well-controlled microstructure, especially in non-conductive ceramic materials.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Novel Technique of Flyash Utilization: Preparation of Silica from Flyash by Alkali Leaching

    Anran GuoJiachen LiuYibing SunWenjun Lian...
    814-815页
    查看更多>>摘要：A new technique of flyash utilization was presented and high-purity silica was prepared by alkali leaching. The flyash was added into sodium hydroxide solution, and then the suspension was heated to 115℃ for 30 min. After filtrated, the filtrate was collected and carbon dioxide was imported into the solution. Finally, the silica would precipitate from the solution. The silica was characterized by scanning electron microscopy, X-ray diffraction and X-ray fluorescence spectrometer. The high-purity silica prepared from flyash was qualified for the rubber reinforcing agent used in shoemaking.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Morphology Control of Si-based Nanostructures by Catalyst-Assisted Pyrolysis of Preceramic Precursors

    Na ZhuZhijian PengChengbiao WangZhiqiang Fu...
    816-819页
    查看更多>>摘要：This paper describes a method of catalyst-assisted pyrolysis of preceramic precursors for the synthesis of Si-based nanostructures. Through tuning the processing conditions, clustered SiO_x amorphous nanowires, bundled single-crystalline Si_3N_4 nanowires, Y-shape and network-like branched single-crystalline Si_3N_4 nanostructures, aligned single-crystalline Si_3N_4 nanowires, and so on, have been synthesized. The results reveal that it is a simple and easy-controlling method, and has potential for mass production of nanomateirals of controlled morphology.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Analysis of Profitability in Chinese listed Ceramic Companies

    Hua Rong-HuiLiwei Zhou
    820-822页
    查看更多>>摘要：There are seven ceramic companies listed in Shanghai and Shenzhen Stock Exchanges. Because they belong to traditional industry sector, the profitability of most companies is weak. Listed companies experienced equity reform from 2005. In the paper, we analyze the impact of the reform and the impact of global financial crisis on those companies.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd