The Effect Of Fiber Surface Treatment by Boric Acid on the Structure and Chemical Property of Carbon/Carbon Composites
The surface treatment of boric acid on carbon fibers was performed by dipping the carbon preform in boric acid and then treated at 2500℃.After the surface treatment,the carbon preform was densified by chemical vapor infiltration to get the modified composite.The influence of the surface treatment on the structure and chemical property of carbon/carbon composites was investigated.The results show that the surface treatment by boric acid has a catalytic- graphitization effect on the fibers that increases the graphitization degree of them and changes the surface state of carbon fibers during high temperature treatment.The modified carbon fibers with rough surface induce the deposition of a layer of pyrocarbon with high texture around the fiber surface and an moderate interface between the carbon fiber and pyrocarbon during chemical vapor infiltration.Due to the improved interface between carbon fibers and pyrocarbon,the mechanical properties of modified carbon/carbon composite are enhanced.The bending curve has obvious pseudo-ductility phenomenon though the flexural strength is slightly increased.The compressive strength is significantly improved.
Surface Treatment Carbon/carbon Composites Interface,Flexural Properties
Chen Jie Lu Zi Long Xiong Xiang Xiao Peng
Stare Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China
国际会议
The tenth China-Japan joint conference on Composite Materials (第10届中日复合材料学术会议(CJJCC-10))
成都
英文
472-477
2012-09-08（万方平台首次上网日期，不代表论文的发表时间）