摘要
采用激光熔覆同步送粉法在304不锈钢上制备出自润滑耐磨涂层,熔覆粉末配比为纯Co, Co-2%Ti_(3)SiC_(2)(质量分数,下同)和Co-8%Ti_(3)SiC_(2)。借助扫描电子显微镜(SEM),能谱分析仪(EDS)和X射线衍射仪(XRD)对熔覆涂层进行表征,系统地研究304不锈钢与涂层在室温和600℃下的摩擦学性能与磨损机理。结果表明:激光熔覆Co-Ti_(3)SiC_(2)涂层的平均显微硬度高于基体(240.3HV_(0.5)),N1,N2和N3涂层的硬度分别为285.7HV_(0.5),356.3HV_(0.5)和463.8HV_(0.5),涂层主要由连续基体γ-Co固溶体,硬质相Fe2C,Cr7C3和TiC,润滑相Ti_(3)SiC_(2)组成。在室温下,基体和N1,N2,N3涂层的摩擦因数分别为_(0.5)6,0.62,0.68和0.42,N1,N2,N3三种涂层的磨损率分别为9.15×10^(-5),7.81×10^(-5),4.66×10^(-5) mm^(3)/(N·m),均明显低于基体(66.42×10^(-5) mm^(3)/(N·m));在高温下,基体和N1,N2,N3涂层的摩擦因数为0.66,_(0.5)4,_(0.5)2和0.46,N1,N2,N3三种涂层磨损率分别为37.79×10^(-5),35.6×10^(-5),18.83×10^(-5) mm^(3)/(N·m),均低于基体(41.3×10^(-5) mm^(3)/(N·m))。在室温和600℃下,涂层具有高于304不锈钢基体的显微硬度,且Co-8%Ti_(3)SiC_(2)涂层呈现出最好的自润滑耐磨性能。
The self lubricating wear-resistant coatings were prepared on the surface of 304 stainless steel successfully using laser cladding synchronous powder feeding method, the ratio of cladding powder was pure Co, Co-2%Ti_(3)SiC_(2)(mass fraction, the same below) and Co-8%Ti_(3)SiC_(2). The microstructure of the cladding coating was characterized by scanning electron microscope(SEM), energy spectrum analyzer(EDS) and X-ray diffractometer(XRD). The tribological performance and related mechanisms of 304 substrate and coatings at RT/600 ℃ were systematically investigated. The results show that the average microhardness of the N1, N2 and N3 coatings are 285.7 HV_(0.5), 356.3 HV_(0.5) and 463.8 HV_(0.5), which are all much higher than that of the matrix(240.3 HV_(0.5)). Co-Ti_(3)SiC_(2) composite coatings are composed of continuous matrix γ-Co solid solution, hard phase(Fe2C, Cr7C3 and TiC) and lubricating phase Ti_(3)SiC_(2). At room temperature, the friction coefficients of the matrix and the N1, N2 and N3 coatings are _(0.5)6, 0.62, 0.68 and 0.42, the wear rates of the N1,N2,N3 coatings are 9.15×10^(-5), 7.81×10^(-5), 4.66×10^(-5) mm^(3)/(N·m), which are lower than that of the matrix(66.42×10^(-5) mm^(3)/(N·m));at high temperature, the friction coefficients of the matrix and the N1, N2 and N3 coatings are 0.66, _(0.5)4, _(0.5)2 and 0.46, the wear rates of the N1,N2,N3 coatings are 37.79×10^(-5), 35.6×10^(-5), 18.83×10^(-5) mm^(3)/(N·m), which are lower than that of the matrix(41.3×10^(-5) mm^(3)/(N·m)).At room temperature and 600 ℃, compared with the 304 stainless substrate, the coatings have the obvious higher microhardness, and the Co-8%Ti_(3)SiC_(2) coating exhibits the best self-lubricating wear resistance.
作者
王港
刘秀波
刘一帆
祝杨
欧阳春生
孟元
罗迎社
WANG Gang;LIU Xiu-bo;LIU Yi-fan;ZHU Yang;OUYANG Chun-sheng;MENG Yuan;LUO Ying-she(Hunan Province Key Laboratory of Materials Surface/Interface Science&Technology,Central South University of Forestry&Technology,Changsha 410004,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Hunan Institute of Traffic Engineering,Hengyang 421000,Hunan,China;Hunan Province Key Laboratory of Engineering Rheology,Central South University of Forestry&Technology,Changsha 410004,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2021年第11期105-115,共11页
Journal of Materials Engineering
基金
国家自然科学基金(52075559)
中国科学院兰州化学物理研究所固体润滑国家重点实验室开放基金(LSL-1802)
辽宁省航发材料摩擦学重点实验室开放基金(LKLAMTF202101)。
