摘要
对预热ＳＨＳ法合成ＳｉＣ粉末所需的最低预热温度及产物粒度与反应物原始粒度的关系等进行了研究．发现合成的ＳｉＣ粉末的粒度与Ｓｉ粉粒度无关，在此基础上对ＳｉＣ的形成机制进行了探讨．在通氮气情况下，预热ＳＨＳ－ＳｉＣ反应中有一个β－Ｓｉ３Ｎ４的生成过程。
SiC SHS process is a weak exothermic reaction. In this paper, the minimum preheating temperature required in SiC synthesis reaction, the relations between reactant particle size and obtained particle size are studied. The result is that the particle size of SiC is controlled by the size of C and unaffected by the size of Si. Based on this result, the model of SiC formation is established. In nitrogen atmosphere, there is a process of β-Si3N4 synthesis in the preheating of SHS-SiC reaction, but the synthesized β-Si3N4 is decomposed very soon at high combustion temperature.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1998年第2期237-242,共6页
Journal of The Chinese Ceramic Society
关键词
预热
自蔓延高温合成
碳化硅
粉末
preheating, self-propagating high-temperature synthesis, carborundum
