超高速激光熔覆M2+MnS涂层高温摩擦磨损性能研究

Research on high-temperature friction and wear performance of ultra-high-speed laser cladded M2+MnS coating

通过对比在干摩擦条件下超高速激光熔覆M2+MnS耐磨自润滑涂层与H13基体的高温摩擦磨损性能,深入探讨了温度和载荷对涂层摩擦磨损性能的影响以及磨损机理。采用SEM、EDS、维氏硬度计、摩擦磨损试验机和白光干涉仪等多种仪器对自润滑涂层试样进行了全面的试验表征。结果表明,室温下,涂层平均摩擦因数基本保持稳定;在一定载荷下,随温度升高,涂层平均摩擦因数呈现下降趋势;与基体相比,相同条件下涂层的平均摩擦因数始终较低。M2+MnS涂层的磨损体积随载荷增大近似呈线性增加,且随测试温度的升高先增大后减小。在300℃时,磨损体积达到最大值,而在600℃时最小;涂层在相同条件下磨损体积始终小于基体,室温下为基体的61.96%,而在600℃时为基体的9.48%。研究还揭示了M2+MnS涂层的磨损机理与温度密切相关。温度较低时,主要表现为磨粒磨损,而温度升高时则主要由氧化磨损和磨粒磨损共同作用。

The effect of temperature and load on the friction and wear performance of the coating,as well as the wear mechanism were explored deeply by comparing the high-temperature friction and wear performance of ultra-high-speed laser cladded M2+MnS wear-resistant self-lubricating coating and H13 substrate under dry friction conditions.Various instruments such as SEM,EDS,Vickers hardness tester,friction and wear testing machine,and white light interferometer were employed for comprehensive test characterization of the self-lubricating coating samples.The results show that at room temperature,the average friction factor of the coating remains stable.Under a certain load,the average friction factor of the coating exhibits decreasing trend with the increase of temperature.Compared with the matrix,the average friction factor of the coating is consistently lower under the same conditions.The wear volume of the M2+MnS coating increases approximately linearly with the increase of load and increases firstly and then decreases with the increase of test temperature.At 300℃,the wear volume reaches the maximum value,while at 600℃,it is the minimum.The wear volume of coating is consistently smaller than that of the matrix under the same conditions,accounting for 61.96%of the wear volume of matrix at room temperature and 9.48%at 600℃.The research also reveals that the wear mechanism of the M2+MnS coating is closely related to temperature.At lower temperatures,it primarily involves abrasive wear,while at higher temperatures,oxidative wear and abrasive wear act together.