SiC引入方式对反应熔渗原位纳米SiC/MoSi_2复合材料组织性能的影响  

Effects of introduction methods of SiC on structure and property of in-situ nano SiC/MoSi_2 composites prepared by reactive melt infiltration

作　　者：张小立[1] 蒋志强[2] 李世显[3] 范积伟[1] 

机构地区：[1]中原工学院材料与化工学院,郑州450007 [2]郑州航空工业管理学院机电工程学院,郑州450015 [3]郑州铁路职业技术学院机电工程系,郑州450052

出　　处：《复合材料学报》2016年第6期1281-1286,共6页Acta Materiae Compositae Sinica

基　　金：河南教育厅自然科学研究计划(2011B430028);河南省科技攻关项目(162102210253)

摘　　要：探讨了SiC引入方式对反应熔渗原位20wt%纳米SiC/MoSi_2复合材料TEM组织及力学性能的影响。结果表明:完全原位反应熔渗硅可获得基体相和增强相均为纳米尺度的SiC/MoSi_2复合材料,其组织中存在大量晶内层错等缺陷,可能会使纳米SiC/MoSi_2复合材料力学性能的提高不十分显著;而部分原位反应熔渗法中,SiC初始粉末的引入可缓解剧烈物相反应,所得纳米SiC/MoSi_2复合材料晶内缺陷消失,断口出现大量撕裂棱,复合材料力学性能大幅提高。The effects of introduction methods of SiC on TEM structure and mechanical properties of 20wt% nano SiC/MoSi2 composites prepared by reactive melt infiltration were studied.The results show that,the nanometer scale of matrix phase and reinforced phase of SiC/MoSi2 composites can be obtained in the process of complete in-situ reactive infiltration silicon,but maybe due to the large number of fault defects inner crystals of the structure,the mechanical properties of the nano SiC/MoSi2 composites improve not too much;when preparing the composites in partial in-situ reactive melt infiltration method to relieve the severe phase reaction,the defects inner crystal in nano SiC/MoSi2 composites disappear,and there are a large number of tear ridges in the fracture,also,the mechanical properties of composites increase obviously due to the introduction of SiC initial powder.

关 键 词：原位 纳米SiC/MoSi_2复合材料 透射组织 力学性能 反应熔渗 

分 类 号：TB332[一般工业技术—材料科学与工程]