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中南大学学报(自然科学版)

Journal of Central South University

第36卷    第4期    总第164期    2005年8月

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文章编号:1672-7207(2005)04-0555-05
纤维体积分数对炭/炭复合材料摩擦磨损性能的影响
左劲旅,张红波,李江鸿,熊 翔

(中南大学粉末冶金国家重点实验室,湖南长沙,410083)

摘 要: 通过化学气相沉积法将纤维体积分数分别为23%,30%和40%的3种炭纤维针刺毡预制件增密至1.50 g·cm-3,再浸渍树脂进一步增密至1.80 g·cm-3,进行热处理后制成炭/炭复合材料,观察3种试样的金相显微结构,测试3种试样在不同刹车压力下的摩擦磨损性能;采用扫描电子显微镜对其磨损表面进行观察。研究结果表明:对于热解炭为非典型粗糙层结构的炭/炭复合材料,纤维体积分数增大,其摩擦曲线相对较平稳,磨损量较大;当纤维体积分数超过30%后,磨损量显著增加;在相同的刹车压力下,纤维体积分数对摩擦因数无显著影响。刹车压力低时试样的摩擦因数比刹车压力高时的摩擦因数大;作为摩擦炭/炭复合材料,纤维体积分数为30%左右较适宜。

 

关键字: 纤维体积分数;炭/炭复合材料;热解炭;摩擦;磨损

Effect of fiber volume fraction on friction and wear properties of C/C composites
ZUO Jin-lü, ZHANG Hong-bo, LI Jiang-hong, XIONG Xiang

State Key Laboratory of Powder Metallurgy, Central South University,
 Changsha 410083, China

Abstract:C/C composites were prepared by needled felt with 23%, 30% and 40% fibre volume fraction through redensifying to density of 1.80 g·cm-3by resin impregnation after redensifying to density of 1.50 g·cm-3by chemical vapour deposit method. The friction and wear properties of C/C composites after high treatment were studied and the effect of braking pressure was also analyzed .And the microstructures and the morphologies of the worn surfaces were observed through optical microscopy and scanning electron microscopy, respectively. The results show that for the C/C composites in which pyrolytic carbon is not representative rough laminar, the wear loss and stability of C/C composites increase with increasing the fibre volume fraction; when the fibre volume fraction exceeds 30%, the increase of wear loss is very distinct; fibre volume fraction does not have obvious influence on the friction coefficient under the same braking pressure; the friction coefficients under lower braking pressure have higher values; as the C/C composites for friction,the suitable fibre volume fraction is about 30%.

 

Key words: fiber volume fraction; C/C composites; pyrolitic carbon; friction; wear

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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