Co对Ni-Ti-Cr-C系熔覆层性能的改进  

Improvement of Erosion Resistance and Wear Resistance of Tungsten Inertia Gas Compound Welded Ni-Ti-Cr-C Cladding Coating by Doping Cobalt

作　　者：马一民[1] 缪谦[1] 刘开[1] 

机构地区：[1]中国电力科学研究院,北京100192

出　　处：《材料保护》2012年第7期52-54,75-76,共3页Materials Protection

摘　　要：在金属陶瓷熔覆层中用V,W系粉末作为凝结相可改善熔覆层的结构和抗裂、抗蚀、耐磨性能,但凝结效果不是很好。为此,向Ni-Ti-Cr-C粉末中添加Co粉制成焊条,利用氩弧堆焊制备了Co-Ni-Ti-Cr-C系熔覆层,对比研究了Ni-Ti-Cr-C和Co-Ni-Ti-Cr-C系熔覆层的相组成、组织结构、成分分布和断面显微硬度分布;并比较了2种熔覆层在不同温度温度和攻角条件下的抗冲蚀性能。结果表明:添加Co粉作为凝结相,有效抑制了熔覆层中气孔、裂纹等缺陷的形成;熔覆层的抗冲蚀性能和耐磨性有所提高。Co powder was introduced into Ni-Ti-Cr-C compound welding powder to prepare Co-Ni-Ti-Cr-C welding rods. Co-Ni-Ti-Cr-C cladding coating was then prepared by tungsten inertia gas compound welding. The phase composition, microstructure, component distribution and microhardness distribution along the cross-sections of the fractured surfaces of Ni-Ti-Cr-C and Co-Ni-Ti-Cr-C compound welding surfaces were comparatively investigated, and their erosion resistance under different temperatures and angles of attack was also compared. Results show that Co powder as the coagulant is able to effectively suppress the formation of crack and gas holes in as-obtained compound welding coatings and to improve the erosion resistance and wear resistance of the cladding coating to some extent.

关 键 词：Ni—Ti—Cr-C系熔覆层 Co-Ni-Ti—Cr-C系熔覆层 氩弧堆焊 抗冲蚀性能 耐磨性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]