摘要
利用催化化学气相沉积法制备炭/炭复合材料,研究了反应温度、前驱体气体含量、催化剂含量和时间对所制备的炭/炭复合材料密度的影响,采用扫描电镜观察分析了基体碳的形貌。结果表明,利用催化剂镍可制取密度达1.594g/cm3的炭/炭复合材料,并有晶须状基体碳生成。在各种工艺参数中,对炭/炭复合材料的密度影响最大的是温度和前驱体气体,其次为催化剂含量,最后是时间。
The conventional process of chemical-vapor infiltration (CVI) of ca rbon that has been employed in the fabrication of carbon/carbon (C/C) composites to densify porous carbon-fiber substrates is costly and time-consuming. A pos sible alternative to conventional CVI processing is to incorporate a material wi thin the carbon-fiber substrate that could increase the carbon deposition rate. In the present study, carbon/carbon composite was fabricated by catalytic chemi cal vapor infiltration (CCVI) with nickel as catalyst. Ni was introduced into th e substrates by wet impregnation. The effects of parameters of CCVI, including r eaction temperature, precursor gas content, catalyst content and time on the den sity of carbon/carbon composite were analyzed, and the surface morphology of the substrate carbon was studied by SEM.The results show that two kinds of carbon a re formed, i.e. carbon whisker and carbon block, and after CCVI treatment the de nsity of C/C can reach 1.594 g/cm3. The ultimate density of C/C dependes on temp erature to a great degree. The optimum process conditions are obtained, which in clude temperature, the volume percent of precursor gas and the Ni loading.
出处
《炭素技术》
CAS
CSCD
2004年第3期17-21,共5页
Carbon Techniques
基金
国家自然科学基金(50372050)
杰出青年基金资助项目(50225210)
关键词
炭/炭复合材料
催化化学气相沉积
镍
碳晶须
Carbon/carbon composite
catalytic chemical vapor infiltration
nicke l
carbon filaments
