谭林,闫峘宇,杨柳,吴文正,叶宏

• 1:重庆理工大学材料科学与工程学院
• 2:华为技术有限公司

摘要(Abstract)：

以不同Ti、Si、石墨粉末含量的Ni45A粉末为原料，采用激光熔覆技术原位合成TiC、Ti_3SiC_2相，在H13钢表面成功制备出TiC-Ti_3SiC_2/Ni基复合涂层。利用X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)和显微硬度计等研究了TiC-Ti_3SiC_2/Ni基复合涂层的物相、显微组织和硬度，并采用磨损试验机分析了复合涂层在室温(RT)、300℃和600℃下的摩擦学性能和磨损机理。结果表明：复合涂层主要由γ-Ni固溶体、Cr_7C_3、TiC、Ti_5Si_3和润滑相Ti_3SiC_2组成，其中TiC呈块状和花瓣状，Ti_3SiC_2和Ti_5Si_3呈颗粒状，Cr_7C_3为胞状；20%Ti-Si-C/Ni复合涂层的显微硬度最高，为824.47 HV0.2,约为Ni基涂层(501.36 HV0.2)的1.6倍；在不同温度下，TiC-Ti_3SiC_2/Ni基复合涂层的磨损率都明显低于Ni基涂层，其中20%Ti-Si-C/Ni复合涂层具有最优的耐磨性；随着磨损温度的升高，20%Ti-Si-C/Ni基复合涂层的磨损机理由轻微的磨粒磨损向磨粒磨损和氧化磨损转变。

关键词(KeyWords)： 激光熔覆;Ni基涂层;原位合成;TiC;Ti_3SiC_2;微观组织;摩擦磨损性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 谭林,闫峘宇,杨柳,吴文正,叶宏

DOI: 10.13289/j.issn.1009-6264.2024-0335

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