定向脉冲气流TG-CVI法致密C/C复合材料工艺及性能

兰州理工大学学报 ›› 2020, Vol. 46 ›› Issue (1): 20-23.

定向脉冲气流TG-CVI法致密C/C复合材料工艺及性能

季根顺¹, 赵浩¹, 贾建刚¹, 张胜¹, 李周¹, 郝相忠²

1.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050;
2.甘肃郝氏炭纤维有限公司技术中心, 甘肃兰州 730010

收稿日期:2019-03-11 出版日期:2020-02-28 发布日期:2020-06-23
作者简介:季根顺(1963-),男,甘肃天水人,教授.
基金资助:
甘肃省科技重大专项(1602GKDD012)

Technological process and performance of C/C composites densified with directional pulse airflow TG-CVI method

JI Gen-shun¹, ZHAO Hao¹, JIA Jian-gang¹, ZHANG Sheng¹LI Zhou¹, HAO Xiang-zhong²

1. State Key Laboratory of Advanced processing and Recycling of Nonferrous Metal, Lanzhou Univ. of Tech. , Lanzhou 730050, China;
2. Technology Center, Gansu Haoshi Carbon Fiber Co. Ltd, Lanzhou 730010, China

Received:2019-03-11 Online:2020-02-28 Published:2020-06-23

摘要/Abstract

摘要： 以液化气为碳源前驱体,氮气为稀释气体,采用定向脉冲气流TG-CVI法,对初始密度为0.14 g·cm^－3的普通碳毡进行致密化处理.研究在不同试验条件下C/C复合材料的致密化过程和密度分布,借助偏光显微镜观察其微观组织,扫描电子显微镜观察其断口形貌,采用三点弯曲法测定C/C复合材料的抗弯强度.结果表明:在热端温度为1 080 ℃、脉冲压力为－3~0 kPa的条件下,经70 h致密化,C/C复合材料的表观密度可达1.836 g·cm^－3,且密度分布均匀;组织为粗糙层(RL)和光滑层(SL)的混合型组织;试样断口形貌呈渐变的锯齿状分布,纤维以拔出为主,表现为假塑性断裂特征,抗弯强度为83.91 MPa.

关键词: C/C复合材料, 定向脉冲气流TG-CVI, 组织结构, 抗弯强度

Abstract: Taking the liquefied gas as carbon source precursor and the nitrogen as dilution gas, the general carbon felt with initial density of 0.14 g·cm^－3 was densified by means of directional pulse airflow TG-CVI method. The densification process and density distribution of the C/C composites were studied under different experimental conditions. The microstructure, fracture morphology and flexural strength of the C/C composites were investigated by using polarized light microscopy, scanning electron microscopy and three-point bending method. The result showed that under condition of hot side temperature of 1 080 ℃ and pulse pressure of -3~0 kPa, the appearance density of the C/C composites after densified for 70 h would be 1.836 g·cm^－3 with uniform density distribution. The microstructure would be a mixed structure of rough laminae(RL) with smooth laminae(SL).The fracture morphology of the samples would exhibit a progressive serrated distribution and the fibers would mainly be of pullout, showing a pseudoplastic fracture feature. In addition, the flexural strength would be 83.91 MPa.

Key words: C/C composite, directional pulse airflow TG-CVI, microstructure, flexural strength

中图分类号:

TB332

季根顺, 赵浩, 贾建刚, 张胜, 李周, 郝相忠. 定向脉冲气流TG-CVI法致密C/C复合材料工艺及性能[J]. 兰州理工大学学报, 2020, 46(1): 20-23.

JI Gen-shun, ZHAO Hao, JIA Jian-gang, ZHANG ShengLI Zhou, HAO Xiang-zhong. Technological process and performance of C/C composites densified with directional pulse airflow TG-CVI method[J]. Journal of Lanzhou University of Technology, 2020, 46(1): 20-23.

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