摘要
为了阐明用于制备炭/炭复合材料的热梯度化学气相沉积工艺原理,分析了沉积过程中随着热解沉积区域的移动,发热体的电阻值以及加在发热体两端功率的变化规律,并利用偏光显微镜观察了材料的粗糙层、光滑层热解炭微观组织结构.结果表明:随着沉积过程的进行,TCVI中加在电极两端的功率呈非线性升高,而电阻值呈非线性降低;利用TCVI工艺在320 h内制备了Φ240 mm×Φ80mm×33mm的盘形件,且炭/炭复合材料的密度均匀性好,密度均大于1.70 g/cm3.
In order to illuminate the principle of thermal gradient chemical vapor infiltration （TCVI） technology for preparation of carbon/carbon composites, the change of resistance and power as a function of deposition regimes was measured and discussed in this paper. The results show that resistance values decrease non-linearly as a function of deposition regimes, and power values increase non-linearly as a function of deposition regimes. A high-textured carbon/carbon composites of th 240 minx th 80 min x 33 min was obtained in 320 hours. The fine bulk density（1.70 g/cm3） was measured. The microstructure of pyrocarbon, including the rough laminar, the smooth laminar pyrocarbon, have been observed and analyzed by polarized-light microscopy.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2005年第5期449-451,共3页
Materials Science and Technology
基金
国家自然科学基金资助项目(50l72039)
关键词
炭/炭复合材料
热梯度化学气相沉积
热解炭
微观组织
carbon/carbon composites
thermal gradient chemical vapor infiltration
pyrocarbon
microstructure
