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采用1700°C、20MPa热压工艺,制备WC-6MoxC-0.47Cr3C2-0.28VC无金属粘结相硬质合金。采用X射线衍射技术分析合金的物相成分,采用扫描电镜与能谱仪对合金的微观组织结构特征进行分析。结果表明,在高温、高压固相烧结过程中,发生了WC中的W原子向MoxC中的大量固溶以及MoxC中的Mo原子向WC中的反向固溶,导致含Mo的WC基固溶体与含W的Mo2C基固溶体的形成。W、Mo原子之间的溶解-析出行为不存在明显的各向异性,没有导致合金晶粒的显著长大。并讨论了合金的固相烧结致密化机制。
Using 1700 ° C, 20MPa hot pressing process, preparation of WC-6MoxC-0.47Cr3C2-0.28VC no metal binder phase cemented carbide. The phase composition of the alloy was analyzed by X-ray diffraction. The microstructure of the alloy was analyzed by SEM and EDS. The results show that during the high-temperature and high-pressure solid-state sintering, a large amount of solid solution of W atoms in WC to MoxC and reverse solution of Mo atoms in MoxC to WC occur, resulting in the formation of Mo- Formation of W-containing Mo2C-based solid solution. There is no significant anisotropy of dissolution and precipitation behavior between the W and Mo atoms, which does not lead to significant grain growth. The mechanism of densification of solid phase sintering was also discussed.