渗透钎焊法制备的WC复合涂层的磨损性能  

Wear Resistance of Tungsten Carbide Composite Cladding Coating on Carbon Steel Substrate

作　　者：晏建武[1,2] 彭阿芳[1,2] 刘国亮[1,2] 曹清华[1,2] 张丽玲[1,2] 

机构地区：[1]江西省精密驱动与控制重点实验室,江西南昌330099 [2]南昌工程学院微纳驱动与控制研究所,江西南昌330099

出　　处：《材料保护》2015年第6期21-23,7,共3页Materials Protection

基　　金：国家自然科学基金项目(51161019);江西省教育厅科技项目(GJJ12638);江西省科技厅科技支撑计划项目(20133BBE50011);江西省科技厅对外合作项目(20141BDH80025)资助

摘　　要：WC复合涂层是一种有效减少工件磨损的保护涂层,目前国内外对渗透钎焊制备的WC复合涂层磨损机理的研究较少。利用渗透钎焊技术在Q235钢表面制备了镍铬合金-碳化钨复合涂层;观察了涂层经过砂轮摩擦后的磨损表面形貌,分析了WC含量对涂层耐磨性能的影响规律以及涂层磨损的微观机制。结果表明:影响涂层耐磨性的因素主要是涂层中的WC含量,涂层的耐磨性随着WC相含量的升高而提高;WC-Co用量为50%制得的涂层的磨损机理是砂轮硬质颗粒对涂层的磨粒磨损,而WC-Co用量10%制得的涂层,砂轮硬质颗粒对涂层的切割除造成少量的WC颗粒脱落外,主要是使大量粘结相镍铬合金韧性撕裂脱落,耐磨性很差,表面形貌为平面状撕裂断面,所以磨损断裂主要是以塑性变形为主。Tungsten carbide- NiCr alloy(denoted as WC-NiCr) composite cladding coating was fabricated on the surface of Q235 steel by infiltration brazing technology in a vacuum furnace.The worn surface morphology of the composite cladding coating after abrasion by emery wheel was observed with a scanning electron microscope.The effect of WC content on the wear resistance of the coating was analyzed,and the wear mechanism of the coating was discussed.Results showed that WC had significant effect on the wear resistance of the cladding coating,and the wear resistance of the cladding coating tended to rise with increasing WC content.In the meantime,the composite coating prepared at a WC- Co content of 50%(mass fraction;the same hereafter) was dominated by abrasive wear.The cladding coating prepared at a WC-Co content of 10%underwent peeling off of a small amount of WC particles as well as ductile tearing of a large number of nickel-chromium alloy binding phase,showing poor wear resistance;and it was dominated by plastic deformation.

关 键 词：渗透钎焊 WC复合涂层 形貌 耐磨性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]