FNiWC15喷熔层的显微组织和耐磨性研究

A Study on Microstructure and Wear-Resistance of FNiWC15 Spray-Welding Coating

表面改性是摩擦学研究中的一个重要领域，而喷熔法则是表面工程中得到广泛应用的表面改性技术，为了揭示喷熔层具有优异耐磨性能的原因，通过扫描电子显微镜观察和Ｘ射线能谱分析，以及无润滑滑动摩擦试验，研究了含１５％（ｗｔ）ＷＣ耐磨相的ＦＮｉＷＣ１５镍基自熔合金粉末喷熔层的显微组织、显微硬度、合金元素分布及其耐磨性，结果表明，ＦＮｉＷＣ１５喷熔层的组织结构是在树枝状镍基固溶体基体上，弥散分布着微细的ＷＣ颗粒，含硅量高和含铬、钨、镍量都低的白色多边形化合物颗粒，以及含铬量高和含硅量低的无定形灰色化合物颗粒；这种喷熔层的耐磨性能是５２１００钢的２６倍。研究结果在推动表面改性技术的发展和扩大喷熔工艺在工程实际中的应用方面都具有指导和启迪作用。

Surface modification is one of important research fields of tribology,and spray-welding is a widely used surface modification technique in surface engineering.In order to revealthe reasons of excellent wear-resistance of the Ni-base FNiWC15 spray-welding coating , this paperinvestigated its microstructure,microhardness, distribution of alloy elements and wear- resistancethrough SEM observation,X-ray energy dispersive spectroscopy analysis and sliding wear test in drycondition . The results showed that its microstructure consists of dendrite matrix of Ni-base solidsolution+dispersive fine WC particles+polygonal compound particles with high Si and low Cr,W,Ni contents +compound particles with high Cr and low Si contents. The wear-resistance ofFNiWC15 spray-welding coating was 26 times that of 52100 steel.This research is of an importantmcaning for promoting the development of surface modification techniques and enlarging theapplication of spray- welding technique in industries.