(1. 湘潭大学 机械工程学院 焊接机器人及应用技术湖南省重点实验室，湘潭 411105；
2. 湘潭大学 复杂轨迹加工工艺及装备教育部工程研究中心，湘潭 411105；
3. 中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 以钨铁和炭黑为反应源，采用真空烧结法反应制备不同n(C)/n(W)的WC-Fe耐磨材料。采用XRD、SEM、EDS、宏观硬度与磨粒磨损等测试技术，对比研究n(C)/n(W)对WC-Fe耐磨材料组织与性能的影响。结果表明：正常WC+γ两相组织对应的n(C)/n(W)范围为1.1~1.3，n(C)/n(W)低于1.1时，出现η相；而n(C)/n(W)高于1.3时，出现C相。随着n(C)/n(W)在0.9~1.7之间增加，硬质WC的含量与平均晶粒尺寸先显著增加后缓慢变化，材料的密度、线收缩率与硬度逐渐下降，磨损质量损失不断增加。
关键字: 钨铁；真空烧结；原位合成；WC-Fe耐磨材料
（1. Key Laboratory of Welding Robot and Application Technology of Hunan Province, School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China;
2. Engineering Research Center of Complex Tracks Processing Technology and Equipment, Ministry of Education, Xiangtan University, Xiangtan 411105, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The in-situ synthesized WC-Fe wear resistant materials with different molar ratios of C to W were prepared by vacuum sintering using ferrotungsten and carbon black as reaction source. The effects of molar ratios of C and W on microstructure and properties were studied by XRD, SEM, EDS, macro-hardness tester and abrasive wear testing technology. The results show that when the molar ratios of C to W of the materials varies from 1.1 to 1.3, the materials have a normal two-phase structure. The molar ratios of C to W of the materials is lower than 1.1, the η phase appears, as when molar ratios of C to W is higher than 1.3, the C phase appears. The content and the average grain size of hard WC observably increase and then change slowly with molar ratios of C and W increase. The density, linear shrinkage and hardness of the material gradually decrease with molar ratios of C and W increase. And the wear mass loss constantly increases with increasing molar ratios of C to W.
Key words: ferrotungsten; vacuum sintering; in-situ synthesis; WC-Fe wear resistant material
