孟祥军,屠小斌,许宏良,王勉,刘秀波,刘海青

• 1:江苏城乡建设职业学院公用事业学院
• 2: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
• 3:同济大学航空航天与力学学院

摘要(Abstract)：

为提高304不锈钢表面的摩擦学性能,采用激光熔覆技术,选取不同激光功率,在304不锈钢表面原位衍生了Cr_7C_3-Fe_2C/MS_2镍基高温耐磨自润滑复合涂层,利用X射线衍射仪(XRD)、扫描电镜(SEM)和显微硬度计等分析测试了复合涂层的物相组成、显微组织和显微硬度,使用HT-1000型高温摩擦磨损试验机测试了涂层在600℃高温下的摩擦磨损性能。结果表明:激光功率对涂层物相组成影响不大,涂层物相组成为Cr_(0.19)Fe_(0.7)Ni_(0.11)固溶体、Cr_7C_3/Fe_2C、Ti_2SC/CrS和少量WS_2相;激光功率为1.8 kW时,涂层组织晶粒细小均匀,涂层平均显微硬度302.0 HV0.5,比不锈钢基体提高了约17.4%,涂层平均摩擦系数为0.35,磨损性能相比基体提高了约1倍;随着激光功率的提高,导致稀释率增加,涂层组织缺陷明显,涂层硬度低于基体。在高温600℃环境下,功率1.8 kW时制备的涂层磨损机理主要为润滑转移膜的形成与剥离、黏着磨损、氧化磨损,表现出优异的高温耐磨自润滑性能。

关键词(KeyWords)： 激光功率;自润滑涂层;微观组织;磨损性能

Abstract:

Keywords:

基金项目(Foundation): 长沙市科技计划项目(kq1901134)

作者(Author): 孟祥军,屠小斌,许宏良,王勉,刘秀波,刘海青

DOI: 10.13289/j.issn.1009-6264.2020-0114

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