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以Mo、Si、C原始粉末为原料,进行机械球磨混合制备混合粉,然后进行原位反应热压烧结制备SiC/MoSi2复合材料。利用X射线衍射仪、扫描电镜对试样进行物相和显微组织观察,并对原位反应机制进行了探讨。结果表明,在选定的球磨条件下,Mo、Si、C混合粉没有发生机械合金化;Mo-Si-C三元系混合粉在原位反应条件下可消除Mo5Si3C等中间相,得到的颗粒细小、相分布均匀以及相组成为SiC与MoSi2的SiC-40vol%/MoSi2复合材料。
The raw powders of Mo, Si, C were mixed by mechanical ball milling to prepare mixed powder, and then in-situ reaction hot-pressed sintering to prepare SiC / MoSi2 composite material. The phase and microstructure of the samples were observed by X-ray diffraction and scanning electron microscopy, and the in-situ reaction mechanism was also discussed. The results show that under the selected ball milling condition, no mechanical alloying of Mo, Si and C powders occurs. Mo-Si-C ternary mixed powder can eliminate the intermediate phase such as Mo5Si3C under in-situ reaction conditions. The obtained particles Small, phase distribution and phase composition of SiC and MoSi2 SiC-40vol% / MoSi2 composite material.