甲烷CVI工艺致密不同尺寸炭/炭复合材料实验与数值模拟研究  

Experimental and numerical simulation studies on C/C composite with different dimensions via chemical vapour infiltration of methane

作　　者：汤哲鹏 贾林涛[2] 谢宇辉 李同起[3] 王梦千 李爱军[2] Tang Zhe-peng;Jia Lin-tao;Xie Yu-hui;Li Tong-qi;Wang Meng-qian;Li Ai-jun(Eighth Research Institute of Nuclear Industry,Shanghai 201800,China;Shanghai University,Shanghai 200072,China;National Key Laboratory of Advanced Functional Composite Materials,Aerospace Research Institute of Materials and Processing Technology,Beijing 100076,China)

机构地区：[1]核工业第八研究所,上海201800 [2]上海大学,上海200072 [3]航天材料及工艺研究所先进功能复合材料技术重点实验室,北京100076

出　　处：《炭素技术》2021年第3期4-7,46,共5页Carbon Techniques

基　　金：国家自然科学基金(21676163);先进功能复合材料技术重点实验室基金(614290601011811)。

摘　　要：在温度为1348 K,压强15 kPa和停留时间1.0 s下,以甲烷为前驱体对两种不同厚度(16 mm和26 mm)2D炭纤维布预制体进行CVI热解炭致密。经120 h致密化后,将制备得到的炭/炭复合材料进行均匀切分,并测量样品的密度分布。实验结果表明,对于不同厚度的预制体,致密化后在气体流动的外侧密度都偏高,且样品密度都随着距气流外侧的距离增加而逐渐降低。通过耦合热解炭沉积反应机理和氢气抑制模型,模拟甲烷在两种不同厚度预制体的CVI致密化过程。计算获得的致密化后样品密度分布的模拟结果与实验结果较为接近,从而表明了该模拟方案的合理性与实用价值。In this study,two 2D cloth performs with different thickness(16 mm and 26 mm)were densified by chemical vapour infiltration(CVI)of methane at a temperature of 1348 K,a pressure of 15 kPa,and a residence of 1.0 s.After 120 h densification,the obtained C/C composites were cut into pieces to measure the density distribution of the composites.From the experimental results of different thickness preforms,the density of the sample near the gas flow channel is higher than that of the inside of it,and the sample density decreases gradually with the distance from the gas flow channel.Along the direction of gas flow,the sample density is gradually reduced,and the density of the inside part of the sample decreases more rapidly along the direction of gas flow.By coupling the mechanism of pyrolytic carbon deposition and hydrogen inhibition model,the CVI densification processes by methane in the two different thickness preforms were simulated.The simulated results show that the sample density distribution after 120 h densification is well matched with the experimental results,which further validates the proposed models.

关 键 词：炭/炭复合材料 化学气相渗透 致密化 

分 类 号：TB332[一般工业技术—材料科学与工程]