| 引用本文: | 周长城,张长瑞,胡海峰,等.准陶瓷Cf/SiC复合材料的制备.[J].国防科技大学学报,2008,30(2):41-45.[点击复制] |
| ZHOU Changcheng,ZHANG Changrui,HU Haifeng,et al.Preparation of Quasi Ceramic Cf/SiC Composites[J].Journal of National University of Defense Technology,2008,30(2):41-45[点击复制] |
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| 准陶瓷Cf/SiC复合材料的制备 |
| 周长城, 张长瑞, 胡海峰, 张玉娣, 王志毅 |
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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: |
| 采用热重-差热(TG-DTA)、红外(IR)等分析测试手段，研究了聚碳硅烷(PCS)的裂解及化学转化过程，从理论上验证了先驱体聚碳硅烷(PCS)600℃裂解产物的准陶瓷特性。先驱体聚碳硅烷在600℃呈现一种半有机、半无机状态，其产物具有准陶瓷的特征，在大约750℃出现无机化转变高峰，固称其为准陶瓷。以碳布、准三维编织体、三维编织体为增强体，采用先驱体浸渍裂解(PIP)工艺在600℃制备了碳纤维增强碳化硅(Cf/SiC)准陶瓷基复合材料。结果表明，以三维编织体增强的准陶瓷Cf/SiC复合材料获得了较理想的结构、性能，所制备3D-Cf/SiC复合材料密度仅有1.27g/cm3，弯曲强度达到193.69MPa，室温拉伸强度为197.69MPa，600℃拉伸强度为167.33MPa。复合材料断口形貌分析表明，在低温600℃制备的准陶瓷Cf/SiC复合材料呈现明显的韧性断裂特征。 |
| 关键词: PCS Cf/SiC 复合材料 先驱体浸渍裂解 准陶瓷 |
| DOI： |
| 投稿日期：2007-10-25 |
| 基金项目:国家部委基金资助项目 |
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| Preparation of Quasi Ceramic Cf/SiC Composites |
| ZHOU Changcheng, ZHANG Changrui, HU Haifeng, ZHANG Yudi, WANG Zhiyi |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The conversion process of the polycarbosilane (PCS) into silicon carbide (SiC) was investigated by TG-DTA, infra-red spectrum analysis (IR) and X-ray diffraction (XRD) etc, which indicated the quasi ceramic characteristics of pyrolyzates treated at 600℃. The carbon fiber reinforced silicon carbide (Cf/SiC) composites were hereby prepared at 600℃ through precursor infiltration and pyrolysis (PIP), and polycarbosilane (PCS) acted as precursor, carbon fiber as enhanced fiber. The results show that bending strength of 3D-Cf/SiC composites are 193.69MPa, room tensile strength 197.69MPa, high temperature(600℃) tensile strength 167.33MPa. Noticeably, the density of 3D-Cf/SiC composites is just only 1.27g/cm3. Furthermore, the fracture surface and microstructure were analyzed and discussed too. |
| Keywords: polycarbosilane Cf/SiC composites precursor infiltration and pyrolysis quasi ceramic |
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