类表面织构化镍基复合涂层的摩擦磨损性能

发布时间：2018-11-27 20:08

【摘要】：在低碳钢表面添加质量分数为20%的WC和6%的石墨颗粒,采用真空熔覆方法制备出具有类织构切面形貌的镍基合金(Ni0)复合涂层,研究了复合涂层的显微组织形貌及形成机理、相组成以及干摩擦条件下的摩擦磨损性能,并与镍基合金(Ni0)、碳化钨增强镍基合金(Ni0+20%WC)、石墨改性镍基合金(Ni0+6%石墨)三种涂层进行了比较。结果表明,WC呈不连续的三维网状分布在镍基合金基体中,镍基合金主要由基体相γ-Ni,铬化物硬质相CrB、Cr7C3、Cr23C6和共晶相Ni3B、Ni3Si构成;WC和石墨的单独加入都能提高复合涂层的摩擦磨损性能,类织构组织复合熔覆层的摩擦磨损性能优于相同组成的硬质颗粒单独弥散分布的复合熔覆层;在WC和镍基合金基体组成的类织构形貌结构和石墨润滑相的共同影响下,复合涂层比单一镍基合金涂层的耐磨性提高大约9.6倍。
[Abstract]:By adding 20% WC and 6% graphite particles on the surface of low carbon steel, Ni-based alloy (Ni0) composite coating with texture like surface morphology was prepared by vacuum cladding. The microstructure and formation mechanism, phase composition and friction and wear properties of the composite coatings under dry friction were studied. The composite coatings were prepared with nickel base alloy (Ni0) and tungsten carbide reinforced nickel base alloy (Ni0 20%WC). Three kinds of graphite modified nickel base alloy (Ni0 6% graphite) coatings were compared. The results show that the WC is distributed in a discontinuous three-dimensional network in the Ni-base alloy matrix. The Ni-base alloy is mainly composed of the hard phase CrB,Cr7C3,Cr23C6 and the eutectic phase Ni3B,Ni3Si of the 纬-Ni, chromate in the matrix phase. The friction and wear properties of composite coatings can be improved by adding WC and graphite alone, and the friction and wear properties of texture-like composite cladding coatings are better than those of the same hard particles distributed separately. The wear resistance of the composite coating is about 9.6times higher than that of the single Ni-base alloy coating under the influence of the texture morphology and graphite lubricating phase of WC and Ni-base alloy substrate.
【作者单位】：兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室;甘肃蓝科高新石化装备股份有限公司;武汉材料保护研究所;西北大学化学与材料科学学院;
【基金】：国家自然科学基金51205178 甘肃省自然科学基金1208RJZA189资助项目~~
【分类号】：TG174.4

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