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采用超音速火焰喷涂(HVOF)工艺在35钢基体上制备了WC-10Ni涂层和WC-12Co涂层,研究了镍、钴这两种粘结剂对WC涂层的显微硬度、摩擦系数和抗磨粒磨损性能的影响,采用扫描电子显微镜观察涂层磨损前后的表面形貌,探讨了WC涂层的磨粒磨损机理。结果表明,以HVOF方法制备的2种WC涂层均有较高的显微硬度,WC-10Ni涂层和WC-12Co涂层与SiC砂纸摩擦副之间的干摩擦系数相差不大。2种涂层在低载荷下均有较好的抗磨粒磨损性能,但在较高载荷下WC-12Co涂层的抗磨性明显优于WC-10Ni涂层。2种涂层的磨粒磨损形式主要为均匀磨耗磨损,磨损机理以微切削和微剥落为主。WC-12Co涂层的磨损表面损伤较轻微,综合性能优于WC-10Ni涂层。
WC-10Ni and WC-12Co coatings were prepared on 35 steel substrates by HVOF process. The effects of Ni and Co on the microhardness, friction coefficient And the wear resistance of the wear-resistant particles. The surface morphology of the coatings before and after wear was observed by scanning electron microscopy, and the abrasive wear mechanism of the WC coating was discussed. The results show that both WC coatings prepared by HVOF have higher microhardness, and the dry friction coefficient between WC-10Ni coating and WC-12Co coating and SiC sandpaper friction pair is similar. The wear resistance of the two coatings is better under low load, but the wear resistance of WC-12Co coating is obviously better than WC-10Ni coating under higher load. The abrasive wear patterns of the two kinds of coatings are mainly uniform abrasion and wear, and the wear mechanism is mainly micro-cutting and micro-spalling. WC-12Co coating wear surface damage is minor, the overall performance is better than the WC-10Ni coating.