WC量对发动机用Ti600表面激光熔覆Ni60A涂层性能的影响  

Influence of WC Mass Fraction on Tribological Properties of Ti600 Alloy Modified with Laser Cladded WC-Doped Ni60A Coating

作　　者：和柯 姚鹏飞 屈哲[2] 杜少杰 梁志礼 HE Ke;YAO Pengfei;QU Zhe;DU Shaojie;LIANG Zhili(College of Automotive Engineering,Yellow River Communications University,Jiaozuo 454950,China;College of Mechanical and Electrical Engineering,Henan Agricultural University,Zhengzhou 450000,China)

机构地区：[1]黄河交通学院汽车工程学院,焦作454950 [2]河南农业大学机电工程学院,郑州450000

出　　处：《真空科学与技术学报》2021年第2期163-167,共5页Chinese Journal of Vacuum Science and Technology

基　　金：河南省高等学校重点科研项目(18B410002)。

摘　　要：在Ni60A粉末内加入10%、20%与30%不同质量分数WC颗粒,利用激光熔覆方法在发动机用Ti600基底表面形成Ni60A/WC涂层,通过实验测试手段分析WC量对涂层组织及性能的影响。研究结果表明:形成了具有同样成分的Ni60A涂层,析出了等轴晶、长条形、环状组织。在Ni60A涂层内加入20%的WC之后,获得了更致密的Ni60A涂层,表现为明显的网篮型组织形态,此时形成了许多细小的TiC晶粒,并且TiB比例大幅提高。加入WC情况下,形成的Ni60A涂层硬度明显增加。加入30%Ni60A/WC后,获得了最大硬度的Ni60A涂层,与基底相比提高了近2倍。由此表明,Ni60A涂层相对于基底组织发生了硬度的大幅提高。加入WC后,摩擦系数减小到0.6以内,磨损量减小到1.0 mg以内,表明Ni60A/WC可以发挥良好减摩效果。在试样表面形成了许多鱼鳞外形的碎屑,加入Ni60A/WC后可以使Ni60A涂层获得更强的耐磨能力。The surfaces of Ti600 alloy,an aviation engine blade material,were modified with laser cladded Ni60 A/WC coating.The influence of the WC mass fraction on the microstructures and tribological behavior of the WC-added Ni60 A coatings was investigated with X-ray diffraction,scanning electron microscopy and mechanical probes.The results show that the WC-addition makes the difference.For example,as the WC mass fraction increased from 10% to 30%(wt),the compactness,density and wear-resistance of the Ni60 A/WC coatings,comprising equiaxed and dendric texture surrounded by an increasing density of TiC nano-grains,increased to varying degrees,and the friction coefficient significantly decreased to below 0.6.Added at WC 30%,the hardness of the coatings had a decreasing hardness depth profile,with the Max surface-hardness 2 times higher than that of Ti600 alloy.Abrasive wear was found to explain the wear mechanism.

关 键 词：TI600钛合金 激光熔覆 Ni60A/WC 微观组织 摩擦性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]