李宾,刘锡尧,张君安,刘波,卢志伟.表面微坑复合MoS2镍基涂层及摩擦磨损性能研究[J].表面技术,2022,51(11):215-225.
LI Bin,LIU Xi-yao,ZHANG Ju-nan,LIU Bo,LU Zhi-wei.Surface Dimples Composite MoS2 Nickel-based Coating and Its Friction and Wear Properties[J].Surface Technology,2022,51(11):215-225
表面微坑复合MoS2镍基涂层及摩擦磨损性能研究
Surface Dimples Composite MoS2 Nickel-based Coating and Its Friction and Wear Properties
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.11.019
中文关键词:  复合涂层  微坑  摩擦因数  减摩  磨损  润滑
英文关键词:composite coating  micro-pits  friction coefficient  friction reduction  wear  lubrication
基金项目:国家自然科学基金(51705390);陕西省自然科学基础研究计划资助项目(2021JQ-652、2020JM-720);河南科技大学高端轴承摩擦学技术与应用国家地方联合工程试验室开放基金(202003);陕西省教育厅科研计划项目(20JK0672);西安市未央区科技计划项目(202110)
作者单位
李宾 西安工业大学,西安 710021 
刘锡尧 西安工业大学,西安 710021;河南科技大学,河南 洛阳 471000 
张君安 西安工业大学,西安 710021 
刘波 西安工业大学,西安 710021 
卢志伟 西安工业大学,西安 710021 
AuthorInstitution
LI Bin Xi'an Technological University, Xi'an 710021, China 
LIU Xi-yao Xi'an Technological University, Xi'an 710021, China;Henan University of Science and Technology, Henan Luoyang 471000, China 
ZHANG Ju-nan Xi'an Technological University, Xi'an 710021, China 
LIU Bo Xi'an Technological University, Xi'an 710021, China 
LU Zhi-wei Xi'an Technological University, Xi'an 710021, China 
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中文摘要:
      目的 为解决硬质涂层抗磨与减摩性能难以兼顾的难题,提出并制备出具有优异减摩耐磨性能的表面微坑复合MoS2镍基涂层结构,为抗磨减摩性能统一的涂层设计提供重要依据。方法 以42CrMo轴承钢为基体,采用两种加工方法(在42CrMo轴承钢表面采用激光熔覆制备镍基涂层,在涂层表面电火花加工微坑织构)制备表面微坑复合MoS2镍基涂层,通过球-盘摩擦磨损试验(GCr15对磨球)分别测试3种载荷(2、4、6 N)下42CrMo轴承钢、42CrMo轴承钢表面镍基涂层和表面微坑复合MoS2镍基复合涂层试样的摩擦学性能,并通过先进测试技术(XRD、SEM)分析复合涂层的组织结构及磨痕微观形貌。结果 在不同载荷工况下,镍基涂层的磨损率远小于42CrMo轴承钢,表面微坑复合MoS2镍基涂层的摩擦因数和磨损率均小于镍基涂层和42CrMo轴承钢,在4 N载荷工况下,镍基-MoS2复合涂层具有最低摩擦因数,达到0.36,磨损率为7.41×10‒7 mm3/(N.m),比镍基涂层试样(26.621 0‒7 mm3/(N.m))降低了72.09%。结论 表面微坑复合MoS2镍基涂层结构中涂层与环氧树脂粘结MoS2固体润滑剂可独立高效发挥自身耐磨、减摩特性,并在不同载荷下发挥协同作用,两种方法复合处理能得到具有良好减摩耐磨性能的表面。
英文摘要:
      In order to solve the problem that the anti-wear and friction reduction properties of hard coatings are difficult to balance, this study proposes and prepares the surface micro-pits composite MoS2 nickel-based coating structure with excellent anti-wear and anti-friction properties, which provides an important basis for the coating design with unified anti-wear and anti-friction properties. Taking 42CrMo bearing steel as substrate, nickel-based coating was prepared by laser melting on the surface of 42CrMo bearing steel, and micro-pits composite MoS2 nickel-based coating was prepared by EDM on the surface of nickel-based coating. The tribological properties of 42CrMo bearing steel, 42CrMo bearing steel surface nickel-based coating and surface micro-pits composite MoS2 nickel-based coating under three loads (2 N, 4 N, 6 N) were tested by ball-on-disc friction and wear test (GCr15 ball). The microstructure and wear scar morphology of the composite coating were analyzed by advanced test techniques (XRD and SEM). The surface of the prepared nickel-based coating has no pores, cracks and other defects. The coating is metallurgically bonded with the substrate, which provides high bearing capacity and good wear resistance for the substrate under external load. A series of complex compounds such as FeNi3, (Cr,Fe)7C3, CrB, and BFe2 were generated in the coating using γ-Ni (Fe) solid melt as the matrix phase. Under the dispersion strengthening of (Cr,Fe)7C3, CrB and other hard phases, the hardness of the coating reached 545HV0.2, 3.5 times that of the matrix. The surface micro-pits of the surface micro-pits composite MoS2 nickel-based coating are well formed, and there are no large cracks at the edge of the micro-pits. The solid lubricant is completely filled at the bottom of the micro-pits, and the filling effect is good. Under different load conditions, the wear rate of nickel-based coating is much lower than that of 42CrMo bearing steel. The friction coefficient and wear rate of surface micro-pits composite MoS2 nickel-based coating are lower than those of nickel- based coating and 42CrMo bearing steel. The friction coefficient decreases first and then increases with the increase of load. Oxidation wear and abrasive wear occur in the sliding process of substrate and coating. Under 4 N load condition, the surface micro-pits composite MoS2 nickel-based coating has the lowest friction coefficient of 0.36, which is 40.9% lower than that of the substrate sample and 21.7% lower than that of the coating sample. The wear rate is 7.41´10‒7 mm3/(N.m). Compared with the Ni-based coating sample (26.62´10‒7 mm3/(N.m)), it decreased by 72.09%. In the process of friction and wear, the solid lubricant in the micro-pits was extruded and dragged onto the surface under the action of stress, transferred and spread along the sliding direction, and formed a stable and continuous lubricating film on the friction surface, so as to obtain a stable friction coefficient and lower wear rate. The coating and solid lubricant in the surface micro-pits composite MoS2 nickel-based coating structure can independently and efficiently play their own wear resistance and friction reduction characteristics, and play a synergistic effect under different loads. The surface with good friction reduction and wear resistance can be obtained by the composite treatment of the two methods.
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