引用本文:李爱农，魏成靓，刘娇姣，周文乐，王华君，况诗婷.激光熔覆铁基Cr3C2/MoS2覆层的组织和摩擦磨损性能[J].中国表面工程,2015,28(5):77~85
LI Ainong, WEI Chengliang, LIU Jiaojiao, ZHOU Wenle, WANG Huajun, KUANG Shiting.Microstructure, Friction and Wear Properties of Laser Cladding Fe-based Cr3C2/MoS2 Coatings[J].China Surface Engineering,2015,28(5):77~85
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激光熔覆铁基Cr3C2/MoS2覆层的组织和摩擦磨损性能
李爱农，魏成靓，刘娇姣，周文乐，王华君，况诗婷1,2
1. 武汉理工大学 材料科学与工程学院;2. 广东顺德亿港科技有限公司
摘要:
采用激光熔覆方法，在45钢表面制备出铁基Cr3C2/MoS2耐磨减摩覆层，通过OM、SEM、EDS、XRD、摩擦磨损试验及XPS对覆层组织、摩擦磨损性能及磨球表面氧化进行了分析。研究表明，熔覆过程中Cr3C2分解主要生成了Cr23C6硬质相；MoS2部分分解形成了CrS微粒，与保留的MoS2一起对覆层材料起到润滑作用。与铁基合金覆层相比，加入Cr3C2/MoS2颗粒后，覆层的摩擦磨损性能显著改善；加入12Cr3C2/6MoS2后，覆层的摩擦因数降低到0.21，仅为铁基覆层的56%，相对耐磨性为其2倍；与Cr12MoV钢相比，铁基12Cr3C2/6MoS2覆层的摩擦因数仅为其51%，相对耐磨性为其2.4倍。研究表明，覆层表面磨损形式主要是粘着磨损及磨粒磨损，加入Cr3C2/MoS2颗粒相后覆层的磨损程度减轻。XPS分析表明，其磨球表面形成了Cr、Fe的氧化物，对降低磨耗及摩擦阻力有积极作用。
关键词:  激光熔覆  耐磨相  减摩相  铁基合金
DOI：10.11933/j.issn.1007-9289.2015.05.012
分类号:
基金项目:
Microstructure, Friction and Wear Properties of Laser Cladding Fe-based Cr3C2/MoS2 Coatings
LI Ainong, WEI Chengliang, LIU Jiaojiao, ZHOU Wenle, WANG Huajun, KUANG Shiting1,2
1. School of Materials Science and Engineering, Wuhan University of Technology;2.Guangdong Shunde Eakong Technology Corporation Limited
Abstract:
The wearresisting and antifriction coatings with different proportions of Cr3C2/MoS2 added in Febased alloy were prepared on 45 steel by laser cladding. Microstructures of the coatings were characterized by optical microscopy (OM), SEM, EDS and XRD. The friction and wear properties of the coatings were investigated by HT1000 wear tester. The oxidation of grinding ball samples were studied by Xray photoelectron spectroscopy (XPS). Results show that Cr3C2 is decomposed and is solidified as Cr23C6 as hard phase during the process of laser cladding. MoS2 is decomposed partially and turned into CrS in coatings, together with the retained MoS2 exhibiting the lubricating effect. Compared with Febased alloy coating, the friction and wear properties are significantly improved with the increase of Cr3C2/MoS2, the friction coefficient of Febased 12Cr3C2/6MoS2 coating decreases to 0.21, being 51% of the pure Febased alloy coating, and its relative wear resistance is 2 times of Febased alloy. Compared with the Cr12MoV steel, the friction coefficient and relative wear resistance of Febased 12Cr3C2/6MoS2 laser coating are 51% and 2.4 times of Cr12MoV steel respectively. Results show that abrasive wear of the specimens surfaces are the major wear forms, while Febased coatings added with Cr3C2/MoS2 have smaller attrition rate. XPS analysis of grinding ball samples shows that chromium oxide and iron oxide are formed on the surfaces of samples, which has a positive effect on the reduction of wear and friction resistances.
Key words:  laser cladding  wear resistant phase  antifriction phase  Febased alloy
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