| 多孔C泡沫预制体液相渗硅制备C/SiC复合材料研究 |
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| 引用本文： | 刘荣军,曹英斌,张长瑞,刘伟.多孔C泡沫预制体液相渗硅制备C/SiC复合材料研究[J].稀有金属材料与工程,2011(Z1):485-487. |
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| 作者姓名： | 刘荣军 曹英斌 张长瑞 刘伟 |
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| 作者单位： | 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; |
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| 摘 要： | 以多孔C泡沫为预制体,利用液相渗Si工艺制备了C/SiC复合材料。采用酚醛树脂浸渍-裂解工艺对C泡沫预制体的孔隙率进行调整,考察浸渍-裂解周期对C泡沫预制体孔隙率的影响,研究了C泡沫预制体孔隙率对C/SiC复合材料密度、力学性能、组成和结构的影响。结果表明:预制体孔隙率为72%时制备的C/SiC复合材料性能较好,其密度为2.58g/cm3、弹性模量为81.39GPa,抗弯曲强度为83.88MPa;随着预制体孔隙率的降低,复合材料的密度、弹性模量和抗弯曲强度不断降低,预制体孔隙率的降低影响液相Si充分扩散与C反应,造成复合材料内部存在大量闭孔,这是导致C/SiC复合材料性能下降的主要原因。
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| 关 键 词： | C泡沫 液相硅浸渗 C/SiC 孔隙率 |
Research on the Fabrication of C/SiC Composites by Liquid Silicon Infiltration Process Using Carbon Foam Preform |
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| Liu Rongjun,Cao Yingbin,Zhang Changrui,Liu Wei.Research on the Fabrication of C/SiC Composites by Liquid Silicon Infiltration Process Using Carbon Foam Preform[J].Rare Metal Materials and Engineering,2011(Z1):485-487. |
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| Authors: | Liu Rongjun Cao Yingbin Zhang Changrui Liu Wei |
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| Affiliation: | Liu Rongjun,Cao Yingbin,Zhang Changrui,Liu Wei (State Key Laboratory of Advanced Ceramic Fibers & Composites,National University of Defense Technology,Changsha 410073,China) |
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| Abstract: | C/SiC composites were fabricated by liquid silicon infiltration (LSI) method using Carbon foam preform. Firstly, the porosity of carbon foam was changed by pith infiltration-pyrolysis processes and the influence of the infiltration-pyrolysis cycles on the porosity of carbon foam was investigated. Secondly, the influence of the porosity of carbon foams on the density and mechanical properties of C/SiC were discussed. It is found that C/SiC composite derived from carbon foam with 72% porosity has the best ela... |
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| Keywords: | carbon foam liquid silicon infiltration C/SiC porosity |
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