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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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    Simulation Research on Elastic Constant and Natural Frequency of NCD Coated AFM Probes

    Yan JiangXiangfeng LiDunwen ZuoJiajing Yuan...
    p.491-494页
    查看更多>>摘要：In this work, the elastic constant and natural frequency of NCD and non-NCD coated AFM probes were simulated using ANSYS. The results indicated that after depositing 1～2μm thick NCD films on the silicon probes, the elastic constant and natural frequency were both increased, yet within the prescribed limit: when the cantilevers had the same total thicknesses (3μm, 3.5μm and 4μm), the elastic constant and the natural frequency of the NCD coated probes were increased by 96%～107% and 28%～30% respectively, compared with the silicon probes.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    An Adaptive Random-period Interpolator for Stepping Motor Systems

    Jun HeYoupeng YouHao ChenHuaming Wang...
    p.495-498页
    查看更多>>摘要：In motion control systems driven by stepping motors, reference word interpolation is usually used with a constant period, which inevitably results in vibration caused by quantization errors and interpolation spare. An interpolator with adaptive random-period is proposed: with the adaptive random-period interpolator, the high-frequency energy excitation from stepping motor driving signals can be greatly dispersed and the desired trajectory and feed profile can be realized through the mutual restriction between the velocity and the displacement. Simulation results show that the adaptive random-period interpolator can effectively improve the velocity excitation, resonant excitation and motion accuracy.
      原文链接:
    • NETL
    • NSTL

    Study on Deposition of NCD on AFM Probe

    Mingmin HuangDunwen ZuoWenzhuang LuFeng Xu...
    p.499-502页
    查看更多>>摘要：The performance of Atomic Force Microscope (AFM) is greatly determined by the quality of its probe. Nowadays, probes of diamond tips have become more and more popular than silicon ones, and have been widely used in industries. In this paper, research about the fabricating of nanocrystalline diamond (NCD) coated AFM probe has been done using Hot-Filament Chemical Vapour Deposition (HFCVD) technique. The results showed that NCD films have been grown on the probe. Problems about the growth of NCD on the tips have been discussed. The optimum parameters have also been proposed. This research can provide reference for the further experiments on the fabrication of NCD coated tips.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Aircraft Assembly Simulation Path Planning Based on Engineering Semantics

    Yingguang LiChengzhi SongWenJuan SongLei Wang...
    p.503-506页
    查看更多>>摘要：A technique of assembly simulation path planning based on engineering semantics is proposed. This method classifies the assembly paths and then describes them as templates based on engineering semantics. A fast assembly simulation path planning is realized by reusing the templates of the assembly path, which improves the efficiency of aircraft assembly simulation path planning.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Research of YAG Laser Cutting Soda-lime Glass Sheets with Controlled Fracture

    N. CaiL.J. YangY. WangZ.G. Tian...
    p.507-510页
    查看更多>>摘要：This paper indicates the experiments of YAG laser cutting soda-lime glass with controlled fracture. The qualities of glass obtained by laser cutting and mechanical cutting are compared. The impact of laser power, scanning speed and spot size on the cutting quality is studied and the optimum laser parameters are given. Finally the experiments of laser cutting two-layer glasses, glass tube and laser cutting in curve paths are carried out. The results show that good cutting quality of glass can be acquired by YAG laser cutting.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Gas-liquid Combined Multiple Cut for WEDM

    Tong WangYumei LuFeng QiuXiaocun Xu...
    p.511-514页
    查看更多>>摘要：This study investigates the dry WEDM in multiple cut. To improve surface quality with high-speed WEDM (HS-WEDM), a new procedure as Gas-liquid Combined Multiple Cut (roughing is processed in dielectric liquid, and semi-finishing is in liquid or gas, while the finishing is in gas) is presented. Effects of pulse duration, peak current, offset, worktable feed and wire length on roughness and removal rate for dry semi-finishing were studied were studied with L_(16)(4~5) design, and significant order inflluncing roughness and removal rate were found. Experiment results show that multiple cut with dry WEDM in semi-finishing and finishing can improve surface roughness significantly.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on the Fabrication and Cutting Performance of HFCVD Diamond Coated Silicon Nitride Inserts

    Guodong YangBin ShenFanghong SunZhiming Zhang...
    p.515-518页
    查看更多>>摘要：Microcrystalline diamond (MCD) and fine-grained diamond (FGD) films are deposited on silicon nitride (Si_3N_4) inserts using the hot filament chemical vapor deposition (HFCVD) method. Scanning electron microscope (SEM), X -ray diffraction (XRD) and Raman spectrum are employed to characterize these as-deposited diamond films. Cutting performance of as-fabricated CVD diamond coated Si_3N_4 inserts is examined in dry turning glass fiber reinforced plastics (GFRP) material, comparing with the uncoated Si_3N_4 inserts. The results indicate that the tool failure is mainly attributed to its severe flank wear, which is caused by continuous friction and impact brought by many hard SiO_2 particles distributed in the GFPR work piece. The lifetime of Si_3N_4 inserts can be prolonged by depositing MCD or FGD films on them and the FGD coated insert shows better wear resistance than the MCD coated one.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Simulation of the Temperature Distribution on Interior Hole Surfaces of Drawing Dies in HFCVD Reaction

    Hua ZhengFanghong Sun
    p.519-522页
    查看更多>>摘要：The temperature distribution on interior hole surfaces of drawing dies in HFCVD reaction was analyzed by combining the FEM simulation and related measurements. The analysis showed a parabolic tendency of elevating substrate temperatures and a moderating tendency of corresponding temperature gradients while enlarging hot-filament radius. The optimization of the hot-filament radius for a sized drawing die to achieve a comfortable substrate temperature distribution for depositing superior diamond films was conducted and safely supported by related experiments. SEM was used to observe the morphology of diamond films. The simulation is of practical significance for improving the deposition of diamond films in HFCVD reaction.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Microstructure and Mechanical Properties of Multi-scale Titanium Diboride Matrix Nanocomposite Ceramic Tool Materials

    Hanlian LiuChuanzhen HuangShourong XiaoHui Wang...
    p.523-526页
    查看更多>>摘要：Under the liquid-phase hot-pressing technique, the multi-scale titanium diboride matrix nanocomposite ceramic tool materials were fabricated by adding both micro-scale and nano-scale TiN particles into TiB_2 with Ni and Mo as sintering aids. The effect of content of nano-scale TiN and sintering temperature on the microstructure and mechanical properties was studied. The result showed that flexural strength and fracture toughness of the composites increased first, and then decreased with an increase of the content of nano-scale TiN, while the Vickers hardness decreased with an increase of the content of nano-scale TiN. The optimal mechanical properties were flexural strength 742 MPa, fracture toughness 6.5 MPa·m~(1/2) and Vickers hardness 17GPa respectively. The intergranular and transgranular fracture mode were observed in the composites. The metal phase can cause ductility toughening and crack bridging, while crack deflection and transgranular fracture mode could be brought by micro-scale TiN and nano-scale TiN respectively.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Simulation of the Effect of Initial Grain Size of Matrix on Microstructure Evolution in Nano-composite Ceramic Tool Material

    H.M. ChengC.Z. HuangH.L. LiuB. Zou...
    p.527-530页
    查看更多>>摘要：A new Monte Carlo Potts' model for the sintering process of two-phase nano-composite ceramic materials with various grain size of initial matrix is set up. The grain growth process is successfully investigated assuming the green body is completely dense. The effect of the initial matrix grain size on microstructure evolution is observed and discussed quantitatively.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd