激光熔覆超音速火焰喷涂陶瓷复合涂层的结构和性能

对YAG激光器产生的矩形激光束及在熔覆超音速火焰喷涂陶瓷复合涂层过程中激光功率对涂层组织和性能的影响进行了研究.采用扫描电镜分析了激光熔覆后的涂层组织结构,比较了采用不同激光输出功率2、3、4kW所得熔覆层的显微硬度和耐磨性能.结果表明:激光熔覆层与基体为冶金结合,熔覆层的硬度较喷涂层的硬度有所提高,并随着激光功率的提高而增加.激光熔覆层的磨损失重远低于喷涂层.

Improvement of High Velocity Oxy-fuel Sprayed Carbide Composite Coatings by Laser Irradiation Treatment

High velocity oxy-fuel sprayed WC-12Co and NiCrBSi composite coatings were irradiated by kaleidoscope installed YAG laser. The laser power and the scanning velocity employed from 2kW to 4kW and 10mm/s, respectively. Scanning electron microscope was used to examine the composite coatings. In order to optimum technology parameter, the laser power effect on hardness and wear resistance of the carbide composite coatings were investigated. The resuits show that there is metallurgical combination interface between composite coatings and substrate. The highest microhardness and density of composite coatings are also enhanced when the laser output power increases. The wear-out rate of irradiated spray coating is lower than that of the HVOF spray coating.