逯平平,李新梅,梁存光,侯素娟,李凯杰

• 1:新疆大学机械工程学院

摘要(Abstract)：

为了提高等离子喷涂WC-12Co涂层的性能,分别对其进行了500、650、800和950℃保温60 min的真空热处理。利用威布尔统计方法对涂层的显微硬度进行分析,利用X射线衍射仪(XRD)、扫描电镜(SEM)和能谱仪(EDS)对热处理前后WC-12Co涂层组织结构进行表征,采用自制的干砂型常温冲刷磨损试验机对WC-12Co涂层热处理前后的抗冲蚀磨损性能进行探讨。结果表明:热处理温度为950℃时,涂层中出现大量Co_6W_6C相,在距离涂层表面0～100μm左右的区域内,涂层较为疏松,涂层显微硬度较低且变化较大,在距离涂层表面100～300μm的区域内涂层硬度趋于稳定且较高,同时,涂层的冲蚀磨损量最好,为0.1124 mg/mm~2,较喷涂态WC-12Co涂层的冲蚀磨损量减少41.88%。当热处理温度为800℃时,weibull模量和特征显微硬度最大,分别为11.8426 HV和1411.3 HV,涂层显微硬度的分散性低、可靠性高,涂层质量相对较为稳定。随着真空热处理温度升高,涂层的主要组成相由WC、W_2C转变为Co_3W_3C和Co_6W_6C。真空热处理后,涂层中各元素都发生了不同程度的扩散,其中Al元素扩散程度最大。

关键词(KeyWords)： 等离子喷涂;热处理;WC-12Co涂层;显微硬度;weibull分析

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51561029,51865055)

作者(Author): 逯平平,李新梅,梁存光,侯素娟,李凯杰

DOI: 10.13289/j.issn.1009-6264.2018-0514

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