熔融渗硅对不同类型C/C复合材料微观结构及性能的影响  

Influence of Silicon Infiltration Process on the Microstructure and Properties of Different C/C Composites

作　　者：杨金华 朗旭东 贺宜红 束小文 焦健 YANG Jinhua;LANG Xudong;HE Yihong;SHU Xiaowen;JIAO Jian(National Defense Key Laboratory of Advanced Composites,AECC Beijing Institute of Aeronautical Materials,Beijing 100095;AECC Hunan Aviation Power Plant Research Institute,Zhuzhou 412002;Army Aviation Representative Office in Beijing,Affiliated with the Equipment Department of People's Liberation Army Ground Force,Beijing 100101)

机构地区：[1]中国航发北京航空材料研究院先进复合材料国防科技重点实验室,北京100095 [2]中国航发湖南动力机械研究所,株洲412002 [3]陆军装备部航空军事代表局驻北京地区航空军事代表室,北京100101

出　　处：《宇航材料工艺》2021年第3期54-59,共6页Aerospace Materials & Technology

摘　　要：选用了三种不同结构的C/C多孔体进行液硅熔渗,采用扫描电镜、X-射线衍射、微纳CT、压汞等方法表征了熔渗前后材料的微观形貌、物相组成及孔隙结构。结果表明,熔渗后材料显气孔率均小于2%,实现了较好的致密化,C/C多孔体熔渗过程中可以采用高残碳树脂裂解形成的树脂碳或化学气相沉积形成的裂解碳进行保护,熔渗后其弯曲强度分别提高到1.5倍与2.5倍,而纤维未被保护的C/C多孔体熔渗后弯曲强度降低41%。Three kinds of C/C composites with different pore structures were infiltrated by silicon.SEM,XRD,micro-CT and mercury intrusion porosimetry methods were adopted to characterize the microstructure,phases and pore-structure changes before and after the infiltration.The apparent porosity of all infiltrated samples was below 2%,indicating high densification degree of them.During the infiltration process,the carbon fibers in the C/C composites can be protected by resin carbon which formed by the pyrolysis of high-char-yied resin or PyC fabricated by chemical vapor depostion method,and the bending strength increases by 1.5 and 2.5 times,respectively.While the carbon fibers in the composites are not protected by the matrix,the bending strength of the samples decreases by 41%.

关 键 词：C/C复合材料 C/C-SIC复合材料 陶瓷基复合材料 熔融渗硅 

分 类 号：TB332[一般工业技术—材料科学与工程]