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首页> 外文会议>Symposium on Nanophase and Nanocomposite Materials III held November 29-December 2, 1999, Boston, Massachusetts, U.S.A. >Formation of Nanocrystalline SiC Powder from Chlorine-Containing Polycarbosilane Precursors
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Formation of Nanocrystalline SiC Powder from Chlorine-Containing Polycarbosilane Precursors

机译：由含氯聚碳硅烷前体形成纳米晶SiC粉

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摘要

Nanocrystalline beta -SiC particulates with a grain size range of 5-20 nm were prepared by heating a pre-pyrolyzed, chlorine-containing polysilane/polycarbosilane (PS/PCS) to 1600 deg C. The transformation from the pre-pyrolyzed PS/PCS to nanocrystalline SiC was investigated by differential thermal analysis (DTA), thermogravimetric analysis (TGA), X-ray diffraction (XRD), mass-spectrometry and infrared spectroscopy. The results indicated that the nanocrystalline beta -SiC was formed by the crystallization of the PS/PCS random network, and crosslinking of Si-Si, Si-Cl, and Si-CH_2-Si bonds. The TEM observation showed that SiC particulates consist of equiaxed, randomly oriented, ultrafine grains.
机译：通过将预热解的含氯聚氯硅烷/聚碳硅烷（PS / PCS）加热到1600℃，制备出晶粒尺寸范围为5-20 nm的纳米晶β-SiC颗粒。从预热解的PS / PCS转变通过差热分析（​​DTA），热重分析（TGA），X射线衍射（XRD），质谱和红外光谱研究了纳米晶SiC的制备方法。结果表明，通过PS / PCS无规网络的结晶以及Si-Si，Si-Cl和Si-CH_2-Si键的交联形成了纳米晶β-SiC。 TEM观察表明，SiC颗粒由等轴，随机取向的超细晶粒组成。

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