Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第7期    总第64期    2004年7月

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文章编号:1004-0609(2004)07-1133-06
以聚硅氧烷为先驱体制备Al-SiCp/Si-O-C
陶瓷复合材料
马青松, 陈朝辉, 郑文伟, 胡海峰

( 国防科技大学 新型陶瓷纤维及其复合材料国防科技重点实验室, 长沙 410073)

摘 要: 以聚硅氧烷为先驱体, SiC为惰性填料, Al为活性填料, 考察了活性填料Al在聚硅氧烷转化制备Si-O-C复合材料中的应用。 研究发现: 600℃时,活性填料Al能与聚硅氧烷裂解产生的含碳小分子气体反应生成Al4C3, 800℃时能与N2反应生成AlN; 这2个反应同时伴有体积膨胀, 能有效弥补聚硅氧烷裂解时的线收缩。 活性填料Al的引入能起到增强作用; 含20%Al(体积分数)的SiC/Si-O-C复合材料的弯曲强度是不含Al的1.36倍; 活性填料Al的引入能显著改善SiC/Si-O-C复合材料的耐高温和抗氧化性能, 但不能提高其抗热震性能。 

 

关键字: 活性填料; 铝; Si-O-C陶瓷;先驱体裂解

Fabrication and characterization of Al-filled-polysiloxane 
derived silicon oxycarbide composites
MA Qing-song, CHEN Zhao-hui, 
ZHENG Wen-wei, HU Hai-feng

Key Laboratory of Advanced Ceramic Fibers and Composites,College of Aerospace and Materials Engineering,National University of Defense Technology, Changsha 410073, China

Abstract: Polysiloxane loaded with SiC as inert filler and Al as active filler, was pyrolyzed in N2 to fabricate Si-O-C composites, and the processing and properties of the filled Si-O-C composites were investigated. Al fillers can react with hydrocarbon generated during polysiloxane pyrolysis at 600℃ and N2 at 800℃ to create Al4C3 and AlN, respectively. The volume expansions resulting from the two reactions are in favor of the reduction in linear shrinkage and the improvement in flexural strength of SiC/Si-O-C composites. The flexural strength of Al-containing SiC/Si-O-C composites is 1.36 times of that of SiC/Si-O-C composites without Al at an Al filler content of 20%. The addition of Al fillers can remarkably improve the high temperature resistance and the oxidation resistance of SiC/Si-O-C composites, but not the thermal shock resistance.

 

Key words: active filler; aluminum; silicon oxycarbide ceramics; preceramic polymer pyrolysis

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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