镍基WC金属陶瓷激光熔覆涂层的熔化烧损规律

HEAT DAMAGE OF LASER CLAD Ni-BASED WC COATING

采用CO2激光器在A3钢上进行镍基碳化钨金属陶瓷的激光熔覆试验，研究了不同复合粉末成分及激光熔覆工艺条件下熔覆层中碳化钨的熔化烧损规律.试验结果表明，熔覆层中碳化钨的烧损主要是反应扩散式烧损，其烧损程度由其与粘结金属间的化学反应程度控制，与复合粉中碳化钨种类、粒度、含量，粘结金属中碳含量以及激光熔覆工艺关系密切.

A 2 kW CO2 laser has been used to deposit Ni based WC alloy onto steel A3 substrate. The effects of ceramic-metal ingredient and laser processing conditions on the heat damage of coatings are studied. Results show that the heat damage level of WC particles in ceramic-metal composite coatings is mainly determinated by the chemical reaction between WC and binder. Further research shows that the mass fractions of carbon in binder, the kind,size and content of WC particles and the laser processing condition all directly affect the heat damage level of composite coatings.