摘要
研究了以ＳｉＣ晶须为增强剂和以聚碳硅烷为先驱体热解制备ＳｉＣｗ／ＳｉＣ陶瓷基复合材料的成型工艺及其热物理性能。同时对ＳｉＣｗ／ＳｉＣ复合材料高温氧化机理进行探索。制得的ＳｉＣｗ／ＳｉＣ复合材料的密度为２．１９／ｃｍ￣３，弯曲强度为２５０ＭＰａ。
The fabrication of SiC whisker-reinforced SiC(SiCw/SiC)by Chemical transformation frompolycarbosilane has been studied.Technical conditions such as raw matcrial ratio,forming pressure,infiltrating palycarbosilane solution in xylene following heat treatment are in vestigated.In air,theoxidation- resistance and thermal shock- resistance properties of SiCw/ SiC are not as well as SiCp/ SiC.Because the size of β-SiCw is small,the oxidation-resistance of β-SiCw is poor.There are a lot of open poresin the SiCw/SiC and in the oxidateing conditions,the product from the oxidation of β-SiCw can not stopO2 from spreading into the composites.Therefore,the strength of the composites decreases.
出处
《高技术通讯》
CAS
CSCD
1994年第6期29-33,共5页
Chinese High Technology Letters
基金
863计划资助项目
关键词
晶须
聚碳硅烷
陶瓷
复合材料
Whisker,Polycarbosilane,Ceramic, Composites materials
