(1. 陜西理工大學 材料科學與工程學院，漢中 723000；
2. 陜西理工大學 礦渣綜合利用環(huán)保技術(shù)國家地方聯(lián)合工程實驗室，漢中 723000)
摘 要: 采用放電等離子熱壓燒結(jié)工藝制備了不同W摻雜量的(Mo,W)2NiB2基金屬陶瓷，對金屬陶瓷的物相組成、微觀組織結(jié)構(gòu)和耐腐蝕性進行了表征與分析。結(jié)果表明：制備的(Mo,W)2NiB2基金屬陶瓷主要由(Mo,W)2NiB2陶瓷相和Ni基黏結(jié)相組成。當W摻雜量(摩爾分數(shù))為0.15%時，(Mo,W)2NiB2基金屬陶瓷表現(xiàn)出最佳的耐腐蝕性能，具有最大的自腐蝕電位和最小的自腐蝕電流密度，分別為-0.889 V( vs SCE)和53.31 μA/cm2，腐蝕表面所形成的具有保護作用的鈍化膜電阻最大，為34.99 kΩ/cm2。
關鍵字: (Mo,W)2NiB2基金屬陶瓷；微觀組織；耐腐蝕性能
（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
