(1. 陕西理工大学 材料科学与工程学院，汉中 723000；
2. 陕西理工大学 矿渣综合利用环保技术国家地方联合工程实验室，汉中 723000)
摘 要: 采用放电等离子热压烧结工艺制备了不同W掺杂量的(Mo,W)2NiB2基金属陶瓷，对金属陶瓷的物相组成、微观组织结构和耐腐蚀性进行了表征与分析。结果表明：制备的(Mo,W)2NiB2基金属陶瓷主要由(Mo,W)2NiB2陶瓷相和Ni基黏结相组成。当W掺杂量(摩尔分数)为0.15%时，(Mo,W)2NiB2基金属陶瓷表现出最佳的耐腐蚀性能，具有最大的自腐蚀电位和最小的自腐蚀电流密度，分别为-0.889 V( vs SCE)和53.31 μA/cm2，腐蚀表面所形成的具有保护作用的钝化膜电阻最大，为34.99 kΩ/cm2。
关键字: (Mo,W)2NiB2基金属陶瓷；微观组织；耐腐蚀性能
（1. School of Material Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China;
2. National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology, Shaanxi University of Technology, Hanzhong 723000, China）
Abstract:(Mo,W)2NiB2 based cermets with different W doping contents were prepared by spark plasma sintering technology. The phase composition, microstructure and corrosion resistance of cermets were characterized and analyzed. The results show that (Mo,W)2NiB2 based cermets are mainly composed of (Mo,W)2NiB2 ceramic phase and Ni based bonding phase. When the W doping content(mole fraction) is 0.15%, (Mo,W)2NiB2 based cermet exhibits excellent corrosion resistance. The self corrosion potential reaches the maximum and the self-current density reaches the minimum, which are -0.889 V(vs SCE) and 53.31 μA/cm2, respectively, and the passive film formed by corrosion surface has a maximum electric resistance of 34.99 kΩ/cm2.
Key words: (Mo,W)2NiB2 based cermets; microstructure; corrosion resistance
