热处理对热浸镀镍基涂层磨料磨损的影响

Effect of Heat Treatment on Abrasive Wear of Hot Dipping Ni-based Coating

对热浸镀镍基合金涂层进行热处理,将热处理前后的涂层样品进行SiC磨料磨损试验,采用XRD和EDS分析了涂层热处理前后的物相组成和成分含量,用SEM观察了涂层磨损后的表面形貌,测定了质量损失。根据试验结果,探讨了涂层的磨料磨损机理,分析了热处理对涂层抗磨料磨损性能的影响。研究表明:涂层热处理前后,均由涂层基体-γ(Fe,Ni)相和析出物富铬相组成,基体相的磨料磨损机理由微小剪切和犁削向疲劳断裂转变,析出物相的磨损机理则均为脆性断裂;热处理能提高基体相的塑性,从而显著提高了涂层抗SiC磨料磨损的性能。

SiC abrasive wear test was carried out into the Ni-based alloy coatings before and after heat treatment.The phases and the component contents of the coatings were analyzed by XRD and EDS,respectively.The surface morphology of the coatings after abrasive wear was observed by SEM.And then the mass loss of the Ni-based coatings was determined by electronic balance.Based on the results,the mechanism of abrasive wear of the coatings was discussed,and effect of heat treatment on abrasive wear of the coatings was analyzed.The research shows that,before and after heat treatment,the phases of the coatings are both composed of γ-（Fe,Ni） phase as the matrix and Cr-rich phase as the precipitates.The mechanism of abrasive wear of the matrix transfers from the slight cutting and ploughing to the fatigue fracture,while the precipitates are fell off as the brittle fracture under the action of the hard SiC particles.Heat treatment can improve the plasticity of the matrix of the coatings,and thus improve the wear resistance of the coatings.