摘要
采用激光熔覆沉积法在汽车活塞销轴常用的40Cr钢表面制备了Ni–TiN涂层,利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、显微硬度计、抗剪强度试验机、摩擦磨损试验机等设备研究了激光功率(1.0、1.5和2.0 kW)对Ni–TiN涂层表面形貌、物相组成、显微硬度、抗剪强度及耐磨性的影响。结果表明:当激光功率为1.5 kW时,Ni–TiN涂层组织结构均匀、致密,颗粒细化程度最高,因此其显微硬度和抗剪强度最高,分别约为843.2 HV和802.8 MPa,在摩擦磨损试验中的摩擦因数最小(平均值为0.44)。
Ni-TiN coating was prepared by laser cladding on the surface of 40Cr steel which is commonly used to make automotive piston pins. The effect of laser power on the surface morphology, phase composition, microhardness, shear strength, and wear resistance of Ni-TiN coating was studied using scanning electron microscope (SEM), X-ray diffractometer (XRD), microhardness tester, shear strength testing machine, and friction and wear testing machine. The results showed that the Ni-TiN coating cladded at a laser power of 1.5 kW had uniform and compact microstructure with the smallest particle size, and hence it had the highest microhardness (843.2 HV) and shear strength (802.8 MPa), as well as the lowest friction factor (0.44).
作者
王斌
徐律
张晓明
WANG Bin;XU LYU;ZHANG Xiaoming(Wuxi Vocational Institute of Commerce,Wuxi 214153,China;Chery Automobile Co.,Ltd.,Wuhu 241000,China)
出处
《电镀与涂饰》
CAS
北大核心
2023年第22期8-14,共7页
Electroplating & Finishing
基金
江苏省高等学校基础科学(自然科学)研究面上项目(22KJD460008)。
关键词
镍
氮化钛
复合涂层
激光熔覆
功率
抗剪强度
微观形貌
摩擦因数
nickel
titanium nitride
composite coating
laser cladding
power
shear strength
micromorphology
friction factor
