| 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 |
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(国防科技大学 航天与材料工程学院 湖南 长沙 410073)
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| 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: |
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| The Study of the Carbon Fiber Coated by Boron Carbide Ceramic Precursors |
| LI Yinkui, LONG Yongfu, LI shibao, ZHANG changrui |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073 China)
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| 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 δь is improved 31.6% and the KIC is improved 5.8%. |
| Keywords: Carbon fibre boron carbide matrix composites |
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