铝合金表面激光熔覆钛基粉末涂层的性能与组织

Properties and microstructure of titanium-based powder coatings on aluminum alloys by laser cladding

采用激光熔覆技术,在铝合金表面制备钛基涂层,对激光熔覆层微观组织、摩擦磨损性能及显微硬度进行测试。结果表明:激光熔覆区主要为树枝晶,过渡区主要为胞状晶,热影响区以等轴晶为主。熔覆层样品表面平均硬度较铝合金基体(120HV)提高了2倍,硬度值为326.3HV。熔覆层的耐磨性能提高显著,表面主要为微小犁沟,磨损损失质量约为铝合金基体的53%。

Ti powder coating was prepared on the surface of Aluminium Alloy using laser cladding technology,the microstructure,the micro-hardness and friction and wear resistance properties of the laser cladding layer were tested. The results show that the microstructure of coating zone is dentrite, afterbirth-like crystal at transition zone,equiaxed grain at heat affect zone. The average hardness of the coating is 326.3 HV,which is about 2 times higher than that of the substrate(120 HV). The wear resistance properties are significantly improved,and the mass loss is about 53 % of that the aluminum alloy,and coating surface is shallow plowing grooves.