原料配比对放电等离子烧结钼碳化物的影响

Effects of raw material ratio on the properties of molybdenum carbide prepared by spark plasma sintering method

摘要: 以Mo粉和C粉为原料，采用放电等离子烧结技术成功制备钼的碳化物烧结体，通过X-射线衍射仪（X-ray diffraction，XRD）、扫描电子显微镜（scanning electron microscopy，SEM）及显微硬度仪等测试分析手段，研究了原料配比对产物的物相组成、微观形貌、显微硬度和气孔率的影响。结果表明：当原料中Mo粉和C粉的摩尔比为2:1时，可制备出致密程度较高的Mo₂C烧结体；当Mo粉和C粉的摩尔比为2:1.5时，能够促使Mo₂C向MoC转变；增加原料中的C粉，会降低烧结体的显微硬度和气孔率。

Abstract: Using Mo powder and C powder as the raw materials, the molybdenum carbide was successfully prepared by spark plasma sintering (SPS) in this paper. The effects of raw material ratio (the mole ratio of Mo/C) on phase composition, morphology, microhardness, and porosity of sintering bodies were analyzed and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and microhardness tester. The results show that, Mo₂C with high density can be gained at Mo/C = 2:1 by mole; however, when the mole ratio of Mo/C is 2:1.5, the transformation from Mo₂C to MoC can be promoted. The microhardness and porosity of sintering bodies may be degraded by the further increase in C powder content.