烧结碳化钨增强激光熔敷涂层耐磨性研究

Wear Resistantof Laser Cladding Coating Reinforced by Sintered Tungsten Carbide

选择烧结碳化钨为增强材料,通过激光熔敷的方法制备烧结碳化钨增强镍基合金;研究碳化钨与镍基合金的结合方式,考察碳化钨增强合金在磨料磨损条件下的磨损性能,并探讨其磨损机制。结果表明:烧结碳化钨的加入显著提高镍基激光熔覆合金的耐磨性,且在烧结碳化钨颗粒表面还获得一层具有良好的耐磨性能和耐蚀性能的组织。原因是碳化钨颗粒与镍基合金在激光加热过程中结合到一起,同时Ni、Cr等基体元素扩散进入碳化钨-钴系统中,形成的新WC黏结相,从而获得一种耐磨、耐蚀性很好的组织。

By selecting the sintered tungsten carbide（S-WC） as the reinforced material,the sintered tungsten carbidereinforced laser cladding alloy was prepared by laser cladding method.The behavior of S-WC bonded with nickel base al-loys was studied,the wear resistant of sintered tungsten carbide reinforced laser cladding coating under abrasive wear wasinvestigated,and the abrasive wear mechanism was explored.The results show that with S-WC particles added,the wear re-sistant of nickel base alloys is greatly improved,and a layer of substance which has excellent anti-wear and anti-corrosiveproperties is formed on the S-WC particles surface.The reasons is that when S-WC bonded with nickel base alloys by laserheating,the matrix elements（such as Ni,Cr etc.） are diffused into WC-Co system,and a new kind of binder phase isformed in cemented carbides,which shows an excellent anti-wear and anti-corrosive properties.