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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 effect of SiC introduction mode on the microstructure and mechanical properties of 20wt% nano-SiC / MoSi_2 composite was investigated. The results show that SiC / MoSi2 composites with matrix phase and reinforcing phase are all nanosized SiC particles can be obtained by infiltrating silicon completely by in situ reaction. There are many defects such as intralayer faults in the microstructure, which may make the mechanical properties of nano-SiC / MoSi2 composite mechanics The performance improvement is not very significant. In some in-situ reactive infiltration process, the introduction of SiC initial powder can ease the severe phase reaction, the defects in the resulting nano-SiC / MoSi2 composite disappear, a large number of tearing edge fracture, composite Mechanical properties increased significantly.