引用本文:从善海， 王黎明， 罗昊， 胡梅.La2O3对EXD602-WC烧结涂层组织与性能的影响[J].中国表面工程,2014,27(1):45~50
CONG Shanhai, WANG Liming, LUO Hao, HU Mei.Effect of La2O3 on Microstructure and Properties of EXD602-WC Sintering Coating[J].China Surface Engineering,2014,27(1):45~50
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La2O3对EXD602-WC烧结涂层组织与性能的影响
从善海， 王黎明， 罗昊， 胡梅
武汉科技大学 钢铁冶金及资源利用省部共建教育部重点实验室, 武汉 430081
摘要:
采用热压烧结技术在45钢基片表面制备50EXD60250WC复合涂层，利用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)进行组织观察、成分以及物相分析，研究了La2O3对涂层组织、表面磨损形貌和耐磨性能的影响。结果表明：涂层中主要含有WC、CuSn相和富Fe相，未添加La2O3的涂层组织中存在较多缺陷，表面磨损严重。随着La2O3的加入，涂层组织和耐磨性能得到不同程度的改善。La2O3质量分数为1.0%时，涂层孔隙率最低仅为0.84%，硬度为54.8 HRC，相对耐磨系数9.76。表面磨损形貌平整且无剥落坑，划痕较浅，涂层与母材结合紧密，表现出最佳的耐磨性能。
关键词:  La2O3  热压烧结  耐磨涂层  气孔率  显微组织
DOI：10.3969/j.issn.1007-9289.2014.01.007
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基金项目:
Effect of La2O3 on Microstructure and Properties of EXD602-WC Sintering Coating
CONG Shanhai, WANG Liming, LUO Hao, HU Mei
Key Laboratory of Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science & Technology, Wuhan 430081
Abstract:
50EXD60250WC coating were prepared on the surface of 45 steel by hotpressing sintering technique. The organization and performance of the coating was studied by using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and Xray diffraction (XRD). The effects of La2O3 on the microstructure, worn surface morphologies and wearresistant properties of the coating were investigated. The results show that WC, CuSn phase and rich Fe phase exist mainly in the coating. There are lots of flaw in the coating before adding La2O3, and the surface of the coating is worn badly. The microstructure and performance of the coating are improved to varying degrees with increasing La2O3. When La2O3 is 1.0%, the lowest porosity of the coating is only 0.84%, the hardness of coating is 54.8 HRC, and the relative wearresistant coefficient is 9.76．Wear surface morphology of the coating is flat and no peeling pits, scratch depth is low, coating is tightly combined with the surface of the base material, and the ability of wearresistance is the best.
Key words:  La2O3  hotpressing sintering  wearresistant coating  porosity  microstructure
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