激光熔覆Ni/WC复合涂层的组织和性能

Microstructure and Properties of Ni/WC Composite Coating Prepared by Laser Cladding

采用激光熔覆方法在A3钢基体上制备Ni/WC复合涂层 ,研究了不同激光功率下复合涂层中WC颗粒的形貌与分布及其对涂层耐磨性能的影响。结果表明 ,在Ni/WC复合涂层中 ,合理的激光功率使WC颗粒部分熔化 ,并在颗粒周围重新凝固并析出针状碳化物 ,这既有利于提高涂层的硬度又能使未熔化的WC颗粒与涂层基体合金牢固结合。

Ni/WC composite coatings were prepared on A3 steel by laser cladding. The morphology and distribution of WC particles under the different laser power and their influences on the wear resistance properties were studied. The results showed that under the appropriate laser power WC particles partially dissolved, with the epitaxially grown needle like carbide around them. Undissolved WC particles are combined strongly with the coating matrix, which has improved wear resistance when compared with the Ni based alloy coating.