Microstructure Characterization of Long W Core SiC Fiber

Microstructure of SiC fiber manufactured by chemical vapor deposition （CVD） onto tungsten （W） wire core was investigated by analytical electron microscopy （AEM）. The results reveal that the fiber consists of W core, SiC sheath and C-coating. SiC sheath could be subdivided into two parts according to whether containing C rich stripe, or not. An emphasis was put on W/SiC interfacial reaction products and the transition zone between sub-layers in SiC sheath. The W/SiC interface consists of three layers of reaction production, namely, W2C, W5Si3 and WC. And there are amounts of facet faults existing in （100） face of WC crystalline and two classes of stack faults in WC have been revealed. The formation essence of different sublayers in SiC sheath was also discussed.

Kinetics Investigation of Sintering of Nanometer Size Metal Clusters:A Molecular Dynamics Study

纳米尺寸金牌簇的 sintering 过程被在嵌入的原子论的方法的框架使用分子的动力学模拟调查。几种分子的动力学模拟技术被用来观察并且描述 sintering 过程的进化。为单个簇的精力分发被检验，二簇的 sintering 过程的快照被记录。sintering 的进化被与每簇的时间阴谋集体中心变化也描述。变化运动并且势能在 sintering 的过程期间被监视并且测量了从精力观点分析 sintering 的主导的机制。