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中南大学学报(自然科学版)

Journal of Central South University

第32卷    第5期    总第141期    2001年10月

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文章编号:1005-9792(2001)05-0494-04
液相法制备炭/炭复合材料的显微结构
熊 翔,黄伯云

(中南大学粉末冶金国家重点实验室,湖南长沙 410083)

摘 要: 采用光学显微镜和扫描电子显微镜对用液相法制备的3种单向纤维增强炭/炭复合材料的显微结构进行了观察和分析.这3种炭/炭复合材料分别采用纯沥青作基体和沥青加焦炭粉、树脂加焦炭粉作预浸初基体制得.在热压成形初坯体内,收缩的微裂纹沿纤维轴向与外界相通,可被再浸渍填充,而孔洞则大多与外界隔绝,不能被再浸渍填充.实验结果表明:焦炭填充料的添加改变了复合材料的显微结构,可调整炭/炭复合材料的纤维体积分数,减少气孔的形成,有利于再浸渍致密化;它还扰乱基体层状结构组织,导致其围绕焦炭粉颗粒呈紊乱状态.

 

关键字: 炭/炭复合材料;液相法;焦炭填充料;显微结构

Microstructures of unidirectional fibre-reinforced C/C
composites fabricated by the liquid method
XIONG Xiang,HUANG Bai-yun

State Key Laboratory for PowderMetallurgy, Central South University, Changsha 410083, China

Abstract:Three kinds of unidirectional fibre-reinforced C/C compositeswere fabricated bythe liquidmethod using pitch,pitch plus coke and resin plus coke during the prepregnation. Theirmicrostructureswere studiedwith optical metallography and SEM. In primary green composites, shrinkage cracks are formedmostly alongthe fibre axial and connected to the outside. They can be easily reimpregnated. However, pores are usually isolated from the outside and can not be reimpregnated. The coke fillers can modify the microstructures and give rise to improved homogeneity of the composite structures. The use of filler particles could facilitate the control of fibre volume fraction and reduce the pores formed duringmoulding. So, the samples with coke fillers can be reimpregnated to get higher densities. On the other hand, coke particles interfere with the layer microstructure of the carbon base.

 

Key words: C/C composites; impregnation; coke fillers; microstructures

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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