摘要
研究了 3种不同功率 (1 8kW、2 2kW、2 6kW)对激光熔覆WCP/Ni基金属陶瓷涂层的组织与磨损性能的影响 .选择合适的激光功率 (2 2kW) ,可以获得WCP 均匀分布并与基体合金结合良好的WCP/Ni涂层 .激光熔覆过程中WC颗粒与基体合金界面间发生了扩散反应溶解 ,导致未熔WC颗粒周围形成了块状的富W碳化物 ,功率较高时更加明显 .激光熔覆WCP/Ni基涂层由未熔WC颗粒 ,块状或枝晶状的富W碳化物 ,杆状的富Cr碳化物以及其间的γ枝晶固溶体及其共晶组织所组成 .不同激光功率下的WCP/Ni涂层的显微硬度与耐磨性均远高于Ni6 0涂层 ,其中 2 2kW功率的WCP/Ni基涂层的显微硬度最高 ,耐磨性最好 .
Effect of different laser powers on microstructures and wear properties of laser cladding WC P/Ni metal ceramics coating was studied in this paper.The WC P/Ni alloy coating with the even-distributed WC ceramics phases and the better bond with the substrate alloy was obtained by choosing 2.2 kW power.Diffusion reaction solution happened between the WC particles and the substrate alloy during laser cladding,giving rise to the formation of block rich-tungsten carbide on the edges of the WC particles,especially in higher power.The WC P/Ni alloy coating consisted of the undissolved WC particles,the block or dendritic rich-tungsten carbide,the bar-like rich-chromium carbide.and dendrite solid solution and eutectic structure among them.Microhardness and wear resistance of the WC P/Ni coating in different powers were much higher or better than Ni60 alloy coating,and were best in 2.2 kW power.
出处
《中国腐蚀与防护学报》
CAS
CSCD
2004年第3期183-187,共5页
Journal of Chinese Society For Corrosion and Protection
基金
中韩政府间国际合作项目 ( 2 0 0 2 0 0 9)
安徽省教育厅自然科学研究项目 ( 2 0 0 3kj0 5 8)
关键词
激光功率
金属陶瓷涂层
组织
磨损
laser power,metal ceramics coating,microstructure,wear
