Ti-Nb-Cr-C掺杂钼合金的组织形貌与热力学分析  

Microstructure and Thermodynamic Analysis of Ti-Nb-Cr-C Doped Molybdenum Alloy

作　　者：张盘龙[1] 倪锋[1] 赵晶晶[1] 徐流杰[1] 魏世忠[1,2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南科技大学河南省耐磨材料工程技术研究中心,河南洛阳471003

出　　处：《稀有金属与硬质合金》2013年第5期19-24,共6页Rare Metals and Cemented Carbides

摘　　要：采用粉末冶金法制备了Ti-Nb-Cr-C掺杂钼合金,对其组织形貌、粒度和成分进行分析,并对球磨过程氧化物生成及烧结过程碳化物生成的热力学进行讨论。结果表明,第二相颗粒主要分布于钼晶粒的晶界上,当Nb含量较多时也可分布于晶粒内部,其主要成分是Nb、Ti和C,根据热力学分析可能是Nb和Ti的复合碳化物。第二相颗粒的存在可细化钼合金晶粒,当Nb加入量为3%时晶粒细化最明显。Cr元素主要以固溶态存在于钼合金中。The Ti-Nb-Cr-C doped molybdenum alloy was prepared by powder metallurgy, and its microstructure, particle size and composition were analyzed. Thermodynamics was discussed of oxide generation during ball milling and carbide formation during sintering. The results show that the second phase particles are mainly distributed on the grain boundary, and also distributed inside the grain when Nb content is eno- ugh. The second phase mainly contains Nb,Ti and C,possibly being composite carbides of Nb and Ti based on the thermodynamics analysis. The second phase particles can refine the grains of molybdenum alloy, and the effect of grain refinement is strongest with Nb content of 3 %. Cr exists in molybdenum alloy mainly in the form of solid solution.

关 键 词：钼合金 Ti—Nb—Cr—C掺杂 碳化物 第二相颗粒 组织形貌 热力学 

分 类 号：TG146.412[一般工业技术—材料科学与工程]