| 裂解工艺对先驱体转化制备Cf/SiC材料结构与性能的影响 |
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| 引用本文： | 简科,陈朝辉,马青松,郑文伟.裂解工艺对先驱体转化制备Cf/SiC材料结构与性能的影响[J].复合材料学报,2004,21(5):57-61. |
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| 作者姓名： | 简科 陈朝辉 马青松 郑文伟 |
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| 作者单位： | 国防科技大学 航天与材料工程学院 新型陶瓷纤维及其复合材料国防科技重点实验室, 长沙 410073 |
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| 摘 要： | 以聚碳硅烷(PCS)/二乙烯基苯(DVB)为先驱体,经8个周期的反复真空浸渍-交联-裂解处理制备出三维编织碳纤维增强碳化硅(3D-B Cf/SiC)复合材料,考察了裂解工艺对材料结构与性能的影响。结果表明:提高裂解升温速率可以提高材料密度,形成较理想的界面结合,从而提高材料的力学性能。裂解温度对材料性能也有较大的影响,Cf/SiC复合材料在第6个周期采用1600℃ 裂解可以弱化纤维与基体之间的界面,提高材料致密度,材料的力学性能也得到较大改善。裂解升温速率为15℃/min,第6个周期采用1600℃裂解制备的Cf/SiC材料性能较好,弯曲强度达到556.7 MPa。
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| 关 键 词： | Cf/SiC材料 裂解温度 裂解速率 弯曲强度 界面 致密度 |
| 文章编号： | 1000-3851(2004)05-0057-05 |
| 收稿时间： | 2003-08-05 |
| 修稿时间： | 2003-11-30 |
EFFECT OF PYROLYSIS PROCESSES ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Cf/SiC COMPOSITES FABRICATED BY PRECURSOR PYROLYSIS |
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| JIAN Ke,CHEN Zhaohui,MA Qingsong,ZHENG Wenwei.EFFECT OF PYROLYSIS PROCESSES ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Cf/SiC COMPOSITES FABRICATED BY PRECURSOR PYROLYSIS[J].Acta Materiae Compositae Sinica,2004,21(5):57-61. |
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| Authors: | JIAN Ke CHEN Zhaohui MA Qingsong ZHENG Wenwei |
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| Affiliation: | Key Laboratory of Novel Ceramic Fibers &|Composites, National University of Defense Technology,Changsha 410073, China |
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| Abstract: | Three-dimensionally braided carbon fiber reinforced SiC(3D-B Cf/SiC) composites were fabricated through 8 cycles of vacuum infiltration of polycarbosilane(PCS)/divinylbenzene(DVB) and subsequent pyrolysis under an inert atmosphere. The effects of pyrolysis processes on the microstructure and mechanical properties of Cf/SiC composites were investigated. The results show that increasing heating rates can increase the density and result in better interfacial bonding leading to better properties of Cf/SiC composites. At the same time, one cycle of 1600℃ heat treatment could also increase the density and mechanical properties of Cf/SiC composites. It was found that the flexural strength of the Cf/SiC composites after pyrolysis by 15℃/min and one cycle of 1600°C heat treatment reached 556.7 MPa. |
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| Keywords: | C_f/SiC composites pyrolysis temperatures heating rates flexural strength interface density |
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