热喷涂Fe基非晶合金涂层的微观结构与摩擦磨损行为

分别采用超音速火焰喷涂工艺和爆炸喷涂工艺,在Q235不锈钢基体上制备Fe基非晶合金涂层,对比研究这2种非晶合金涂层在室温下的干摩擦磨损特性,并探讨摩擦磨损机理.结果表明,与超音速火焰喷涂工艺制备的Fe基非晶合金涂层相比,采用爆炸喷涂工艺制备的涂层更致密,孔隙率为2.1％,显微硬度更高,平均硬度高达1 095.6 HV,且耐磨性更好;并且涂层摩擦因数增至稳定值的时间较短,具有更稳定的摩擦磨损行为.超音速火焰喷涂涂层的磨损形式主要以疲劳磨损为主,而爆炸喷涂涂层的磨损形式为粘着磨损和磨粒磨损的综合作用,并以粘着磨损为主.

Microstructure and friction behavior of iron-based amorphous alloy coating prepared by thermal spraying

Iron-based amorphous alloy coatings were deposited on Q235 stainless steel substrates by high velocity oxy-fuel(HVOF) thermal spraying and detonation gun thermal spraying.The dry friction and wear characteristics of the amorphous alloy coatings at room temperature were studied,the friction and wear mechanism was also discussed.Experiment results show that the iron-based amorphous alloy coatings prepared by detonation gun spraying process present more compact structure with lower porosity of 2.1%,higher micro-hardness with the average hardness of 1 095.6 HV and more excellent wear resistance than that of the iron-based amorphous alloy coatings prepared by HVOF.The iron-based amorphous alloy coating prepared by detonation gun spraying process takes shorter time to achieve stable friction coefficient,and it has a more stable friction and wear behavior.The wear mechanism of the iron-based amorphous alloy coatings deposited by HVOF is mostly fatigue wear.However,the wear mechanism of detonation gun thermal sprayed coatings is the combination of adhesive wear and abrasive wear,and the main wear mechanism is adhesive wear.