학술논문
激光熔覆Co-2%Ti3SiC2复合涂层在不同温度及载荷下的摩擦学性能 / Tribological properties of laser cladding Co-2%Ti3SiC2 composite coating at different temperatures and loads
Document Type
Academic Journal
Author
孟祥军; 欧阳春生; 刘秀波; 罗迎社; 许继星; 王威; 肖敏; 卢迎; 李梓祥; MENG Xiang-jun; OUYANG Chun-sheng; LIU Xiu-bo; LUO Ying-she; XU Ji-xing; WANG Wei; XIAO Min; LU Ying; LI Zi-xiang
Source
材料热处理学报 / Transactions of Materials and Heat Treatment. 45(2):156-163
Subject
Language
Chinese
ISSN
1009-6264
Abstract
为了提高 304 不锈钢的耐磨减摩性能,采用激光熔覆技术在其表面制备了 Co-2%Ti3SiC2 复合涂层.通过扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)对Co-2%Ti3SiC2 复合涂层的微观结构进行表征,并分析了 304 不锈钢基体与Co-2%Ti3SiC2 复合涂层在等温摩擦实验(25 和 600℃)中不同载荷(2、5 和 8 N)下的摩擦学性能和磨损机理.结果表明:Co-2%Ti3SiC2 复合涂层主要由γ-Co固溶体,硬质相Fe2C、Cr7C3 和TiC及润滑相Ti3SiC2 组成.Co-2%Ti3SiC2 复合涂层的平均显微硬度为 358.61 HV0.5,约是304 不锈钢基体(239.32 HV0.5)的1.5 倍.在等温摩擦实验中,Co-2%Ti3SiC2 复合涂层的磨损率均随着载荷的增加而减少,而摩擦系数在室温下随载荷的增加先增大后减小,在高温(600℃)下随载荷的增加而减小.在不同温度及载荷下,Co-2%Ti3SiC2 复合涂层的磨损机理略有不同.
In order to improve the resistance and anti-friction performance of 304 stainless steel,a Co-2%Ti3SiC2 composite coating was prepared on its surface by laser cladding technology.Microstructure of the Co-2%Ti3SiC2 composite coating was characterized by means of scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)analysis and X-ray diffraction(XRD),and the tribological properties and wear mechanism of the 304 stainless steel matrix and Co-2%Ti3SiC2 composite coating under different loads(2,5 and 8 N)in isothermal friction experiments(25℃ and 600℃)were analyzed.The results show that the Co-2%Ti3SiC2 composite coating is mainly composed of γ-Co solid solution,hard phases Fe2C,Cr7C3 and TiC,and lubricating phase Ti3SiC2.The average microhardness of the Co-2%Ti3SiC2 composite coating is 358.61 HV0.5,which is approximately 1.5 times that of the 304 stainless steel substrate(239.32 HV0.5).In the isothermal friction experiments,the wear rate of the Co-2%Ti3SiC2 composite coating decreases with the increase of load,while the friction coefficient first increases and then decreases with the increase of load at room temperature,and decreases with the increase of load at high temperature(600℃).The wear mechanism of the Co-2%Ti3SiC2 composite coating varies slightly under different temperatures and loads.
In order to improve the resistance and anti-friction performance of 304 stainless steel,a Co-2%Ti3SiC2 composite coating was prepared on its surface by laser cladding technology.Microstructure of the Co-2%Ti3SiC2 composite coating was characterized by means of scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)analysis and X-ray diffraction(XRD),and the tribological properties and wear mechanism of the 304 stainless steel matrix and Co-2%Ti3SiC2 composite coating under different loads(2,5 and 8 N)in isothermal friction experiments(25℃ and 600℃)were analyzed.The results show that the Co-2%Ti3SiC2 composite coating is mainly composed of γ-Co solid solution,hard phases Fe2C,Cr7C3 and TiC,and lubricating phase Ti3SiC2.The average microhardness of the Co-2%Ti3SiC2 composite coating is 358.61 HV0.5,which is approximately 1.5 times that of the 304 stainless steel substrate(239.32 HV0.5).In the isothermal friction experiments,the wear rate of the Co-2%Ti3SiC2 composite coating decreases with the increase of load,while the friction coefficient first increases and then decreases with the increase of load at room temperature,and decreases with the increase of load at high temperature(600℃).The wear mechanism of the Co-2%Ti3SiC2 composite coating varies slightly under different temperatures and loads.