多孔体制备工艺对C/C-SiC复合材料弯曲性能的影响  

Effect of manufacturing techniques of performs on properties and fracture modes of C/C-SiC composites

作　　者：王林山[1] 熊翔[1] 肖鹏[1] 闫志巧[1] 李江鸿[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2003年第5期1196-1201,共6页The Chinese Journal of Nonferrous Metals

基　　金：教育部科学技术研究重点项目 (0 2 14 8)

摘　　要：以针刺整体炭毡为坯体 ,采用CVD和树脂浸渍 /炭化混合法增密制备了 4种C/C多孔体 ,然后熔硅浸渗C/C多孔体制备了C/C SiC复合材料 ;研究了不同炭涂层、高温热处理对C/C SiC复合材料弯曲强度和断裂方式的影响。结果表明 :热解炭涂层可减少制备过程中炭纤维的损伤 ,具有适中的界面结合强度 ,使复合材料的弯曲强度达到 16 1.5MPa ,表现出良好的“假塑性” ;适当选择高温热处理工艺可制备弯曲性能较高 ,具有一定“假塑性”的C/C SiC复合材料。Through molten silicon infiltration the C/C-SiC composites were made of the different porous C/C preforms which were prepared by the mixing of CVD and resin impregnation /carbonization with the integrity felt as preforms. The effects of different carbon coatings and high temperature treatment on the flexural strength and fracture modes of C/C-SiC composites were studied. The results show that C/C-SiC composites with pyrolytic carbon coating have higher flexural strengths (the maximum strength is 161.5 MPa), and the flexural stress-displacement curve shows better 'pseudo-plastic', compared with the composites with resin carbon coating. The higher flexural strengths and better 'pseudo-plastic' of the composites with resin carbon coatings can be achieved by appropriate high temperature treatment.

关 键 词：C/C-SIC复合材料 弯曲性能 高温热处理 熔硅浸渗 弯曲强度 断裂 多孔体 

分 类 号：TB332[一般工业技术—材料科学与工程]