Synthesis of sinterable SiC powders by carbothermic reduction of gel-derived precursors; and pyrolysis of polycarbosilane
Synthesis of sinterable SiC powders by carbothermic reduction of gel-derived precursors; and pyrolysis of polycarbosilane
复制标题
通过凝胶衍生前体的碳热还原合成可烧结 SiC 粉末；
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
L. A. Harris
中科院分区：
文献类型：
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作者：
G. C. Wei;C. Kennedy;L. A. Harris
碳化硅粉末的合成方法为：1) 源自胶体二氧化硅或甲基三甲氧基硅烷的碳掺杂硅胶的碳热还原，以及 2) 聚合 SiC 前体的热解。粉末特性，包括可烧结性，取决于前体的类型和成分。将掺杂有硼和碳的胶体二氧化硅-蔗糖和沥青SiC粉末在2100℃的氩气中烧结至理论密度的95%至96%。这些烧结 SiC 体的微观结构由细长晶粒（最大 50 m）和等轴晶粒（约 10 m）的混合物组成，在晶界或晶粒内部具有残余孔隙（最大 8 m）。 12 篇参考文献、7 张图、2 个表格。
Silicon carbide powders were synthesized by 1) carbothermic reduction of carbon-doped silica gel derived from colloidal silica or methyltrimethoxysilane and 2) pyrolysis of polymeric SiC precursors. Powder characteristics, including sinterability, depended on the type and composition of the precursor. The colloidal silica-sucrose and -pitch SiC powders doped with boron and carbon were sintered to 95% to 96% of theoretical density at 2100C in argon. The microstructures of these sintered SiC bodies consisted of mixtures of elongated grains (up to 50 m) and equiaxed grains (approx. = 10 m) with residual pores (up to 8 m) at grain boundaries or inside grains. 12 references, 7 figures, 2 tables.