国防科技大学学报

引用本文:	李银奎,龙永福,李石保,等.用B₄C陶瓷先驱体涂复碳纤维研究.[J].国防科技大学学报,2000,22(2):33-36.[点击复制]
	LI Yinkui,LONG Yongfu,LI shibao,et al.The Study of the Carbon Fiber Coated by Boron Carbide Ceramic Precursors[J].Journal of National University of Defense Technology,2000,22(2):33-36[点击复制]

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用B₄C陶瓷先驱体涂复碳纤维研究

李银奎, 龙永福, 李石保, 张长瑞

(国防科技大学航天与材料工程学院湖南长沙 410073)

摘要:

用溴苯和BF₃乙醚为起始原料,合成出聚对亚苯基硼(PPB),高温裂解后得到含B₄C 54.4%、B₂O₂ 13.6%、自由碳32%的陶瓷。用溶液浸涂碳纤维(CF)并高温裂解后得到B₄C涂层CF,与未涂层CF相比,B₄C涂层CF抗热氧化性提高200℃。1800℃热压时B₄C涂层CF较未涂层CF制得的CF/SiC复合材料的бь值提高10.5%,KIC值提高19.4%,1850℃热压时相应的бь值提高31.6%,KIC提高5.8%。

关键词: 碳纤维碳化硼复合材料

DOI：

投稿日期：1999-08-05

基金项目:

The Study of the Carbon Fiber Coated by Boron Carbide Ceramic Precursors

LI Yinkui, LONG Yongfu, LI shibao, ZHANG changrui

(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073 China)

Abstract:

Using PhBr and BF₃: OEt₂ as the raw materials, the poly(p-phenylene borane) (PPB) is synthesized, After PPB is pyrolyzed in high temperature, the product containing 54.4% B₄C. 32% free canbon and 13.6% B₂O₃ is obtained. If the carbon fiber(Cf) is dipped in the solution of PPB and pyrolyzed in high temperature, the Cf coated by B₄C (B₄C-Cf) is obtained, Comparing with raw Cf in same treat conditions, the tempereture of thermal oxidation resistance of B₄C-Cf has increased by 200℃. The δ₆ of Cf/SiC matrix composites made by using B₄C-Cf 1800℃ is improved 10.5% and the KIC is improved 19.4%. At 1850℃, the δ_ь is improved 31.6% and the KIC is improved 5.8%.

Keywords: Carbon fibre boron carbide matrix composites