CVI处理对浸渍裂解法制备C/C-SiC复合材料弯曲性能的影响  

Effect of chemical vapor infiltration on the flexural properties of C/C-SiC composites prepared by the precursor infiltration pyrolysis method

作　　者：贾林涛 王梦千 郭小凤 朱界 李爱军 彭雨晴 JIA Lin-tao;WANG Meng-qian;GUO Xiao-feng;ZHU Jie;LI Ai-jun;PENG Yu-qing(Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院材料研究所,上海200444

出　　处：《新型炭材料（中英文）》2023年第6期1127-1134,共8页New Carbon Materials

基　　金：国家自然科学基金项目(21676163,51602189);航空科学基金(2016ZFS6001,2017ZFS6001);上海市自然科学基金(18ZR1417700).

摘　　要：以2D叠层炭布为增强体,以掺加硅粉、炭粉和碳化硅粉3种无机粉体的糠酮树脂为前驱体,经浸渍、热压固化、炭化裂解和高温热处理过程制备出炭/炭-碳化硅(C/C-SiC)复合材料。采用多功能密度测试仪、扫描电子显微镜(SEM)、X射线衍射仪(XRD)和力学万能试验机,研究了硅粉、炭粉和碳化硅粉的掺加量以及后续化学气相渗透(CVI)处理对C/C-SiC复合材料致密度、微观结构及抗弯强度的影响。结果表明:硅粉、炭粉和碳化硅粉掺加后所形成的碳化硅颗粒对复合材料起到颗粒弥散增强的作用。具体而言,粉体掺加量越多,C/C-SiC复合材料越致密,抗弯强度越大;在三点弯曲载荷作用下,C/C-SiC复合材料呈假塑性断裂模式,并且出现层间开裂现象。对C/C-SiC复合材料进行10 h CVI处理后发现,形成的热解炭可以作为炭纤维与树脂炭基体之间的界面,弥补了树脂炭的微孔,相比于未进行CVI处理的C/C-SiC复合材料,密度最大提高了4.98%,抗弯强度最大提高了38.86%。Carbon/carbon-silicon carbide(C/C-SiC)composites were prepared by impregnation,hot-pressing with curing,carbon-ization at 800 oC and high-temperature heat treatment(800-1600 oC)using a 2D laminated carbon cloth as the reinforcing filler,and furfurone resin mixed with silicon,carbon from furfurone resin and SiC powders as the matrix.The effects of the addition of the three powders as well as subsequent chemical vapor infiltration(CVI)by methane on the density,microstructure and bend strength of the composites were investigated by scanning electron microscopy,density measurements,X-ray diffraction and mechanical testing.Both the SiC powders formed by the reaction at 1600 oC between the added Si and C particles and the added SiC powder,play a role in the reinforcement of the materials.In three-point bending,the composites had a pseudoplastic fracture mode and showed interlam-inar cracking.After 10 h CVI with methane,pyrolytic carbon was formed at the interface between some of the carbon fibers and the resin carbon matrix,which produced maximum increases in the density and flexural strength of the composites of 4.98%and 38.86%,respectively.

关 键 词：糠酮树脂 C/C-SIC复合材料 无机粉体 化学气相渗透 抗弯强度 

分 类 号：TQ174[化学工程—陶瓷工业]