首页|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

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

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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.
Tribological properties of laser cladding Co-2%Ti3SiC2 composite coating at 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.

304 stainless steelCo-2%Ti3SiC2 composite coatinglaser claddingtribological property

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

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江苏城乡建设职业学院公用事业学院,江苏 常州 213147

湖南交通工程学院交通运输工程学院,湖南 衡阳 421000

中南林业科技大学,材料表界面科学与技术湖南省重点实验室,湖南 长沙 410004

304不锈钢 Co-2%Ti3SiC2复合涂层 激光熔覆 摩擦学性能

江苏高校青蓝工程资助&&苏城建院科研团队2022年湖南省教育厅科学研究一般项目2022年国家级大学生创新训练项目

苏教师函[2022]51号苏高职培函[2022]12号2022QYSJ01222C0936202213924002

2024

10.13289/j.issn.1009-6264.2023-0390

材料热处理学报
中国机械工程学会

材料热处理学报

CSTPCD北大核心
影响因子：0.958
ISSN：1009-6264
年,卷(期)：2024.45(2)
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