沥青浸渍炭化C/C复合材料密度及孔隙分布
昊书锋1.2
周绍建1.2黄剑1.2
嵇阿琳1,2
(1西安航天复合材料研究所，西安710025）
张智1,2
（2高性能炭纤维制造及应用国家地方联合工程研究中心，西安710089）
文摘以径棒法编织成型预制体，采用沥青浸渍炭化工艺制备了C/C复合材料（1.50g/cm"），采用CT 检测了试件的密度分布特征，并采用光学显微镜和压汞法分析了试件的孔隙分布特征。结果表明，在沥青浸渍炭化的工艺条件下，试件外端密度最高，由外端到中心沿径向密度减；以坏体中心为参照点，同一圆周方向窑度均匀分布；坏体开孔率沿径向由外端到中心递增；坏体大孔和中孔孔容积比率沿径向从外端到中心递增，而微孔孔容积比率则从外端到中心递减。
关键词C/C复合材料，压汞法，密度，孔隙
中图分类号：TB3
D0I:10.3969/j.issn.10072330.2014.06.010
Distribution of DensityandPores of C/C Composite Prepared by
Pitch Impregnation and Carbonization
ZHOU Shaojian.2
HUANGJian'2
WUShufeng"2
JI Alin,2
(1Xi'an Aerospace Composite Materials Research Institute, Xi'an 710025)
ZHANG Zhi,2
(2National and Local Union Engineering Research Center of High Performance Carbon Fiber
Manufacture and Application, Xi'an 710089)
AbstractBy taking preform weaven with radial carbon rods as reinforcement phase, C/C composite was pre pared by impregnation and carbonization process using coal tar pitch as matrix precursor, and its bulk density is 1. 50 g/cm'. The distribution of density was tested by CT, and the distribution of pores were analyzed by means of optical microscope and mercury intrusion method. The results showed that the density of outer fringe of body is the highest, and the density decreased from outboard to center along radial of the body under the technological conditions of pitch impregnation and carbonization. The density distributed evenly along the direction of identical circle taking body cen-ter as reference point. The porosity of the body increased from outboard to center along radial of the body. The pore volume ratio ofmacropores and mesopores increased from outboard to center along radial of the body,on the contrary the pore volume ratio of micropores decreased from outboard to center along radial of the body .
Key wordsC/C composite,Mercury intrusion method,Density, Pore
0引言
C/C复合材料的孔隙结构对其性能影响很大，分为开口及闭口气孔。致密过程实际上是渗透进人坏体孔洞或孔隙的气相或液相有机化合物自身炭化进行孔洞空腔的填充过程。煤沥青是液相致密法制备 C/C复合材料常用的浸渍剂，沥青浸渍炭化法对孔隙的填充很有效!1-3}。对于沥青液相致密，常压炭化很
收稿日期：2014-0701
难将坏体致密到较高的密度，因此常采用常压和高压炭化相结合的致密工艺，通过常压炭化，将坏体致密到一定密度，再通过高压炭化致密到最终密度。
本文采用径棒法编织成型预制体，采用沥青浸渍、常压炭化工艺制备了低密度C/C复合材料，分析
了其密度和孔隙分布特征。 1实验
基金项目：国防基础科研项目（C0320110006）
作者简介：周绍建，1971年出生，高级工程师，主要从事C/C复合材料工艺研究。Email：hsea2005@163.com
42 万方数据
宇航材料工艺
http://www. yhelgy. com
2014年第6期