1800℃热处理对PIP法C/SiC复合材料结构和性能的影响  

Effect of 1800℃ Annealing on Microstructures and Properties of C/SiC Composites Fabricated by Precursor Infiltration and Pyrolysis

作　　者：马彦[1] 陈朝辉[2] 

机构地区：[1]中国人民解放军总后勤部建筑工程研究所,西安710032 [2]国防科技大学航天与材料工程学院,长沙410073

出　　处：《材料工程》2015年第4期98-101,共4页Journal of Materials Engineering

基　　金：国家自然科学基金重点资助项目(90916002)

摘　　要：采用扫描电镜(SEM)和透射电镜(TEM),研究氩气中1800℃热处理对先驱体浸渍-裂解(PIP)工艺制备三维编织C/SiC复合材料结构和性能的影响。结果表明:在1800℃热处理过程中,C/SiC复合材料的界面处发生了碳热还原反应和硅扩散,导致基体和纤维之间产生化学结合,纤维受到损伤;1800℃热处理后,PIP法C/SiC复合材料出现8%的失重率,力学性能急剧下降80%以上,断裂行为由韧性转变为脆性断裂。Using SEM and TEM,the effect of 1800℃ annealing on microstructures and properties of3 Dbraided C/SiC composites was investigated under Ar,fabricated by PIP process.The results show that during 1800℃ annealing,the carbothermic reductions and Si diffusing happen at the interfaces of C/SiC composites,resulting in the chemical bonding between fibers and matrix,and fibers are damaged.After 1800℃ annealing,the C/SiC composites fabricated by PIP process indicate 8% mass loss rate,the mechanical properties sharply decrease over 80%,and the fracture behavior changes from toughness fracture to brittle fracture.

关 键 词：C/SIC复合材料 力学性能 微观结构 热处理 

分 类 号：TB332[一般工业技术—材料科学与工程]