Abstract：Three kinds of steel back (45# steel) with different surface coatings were used to prepare Cu-based powder metallurgy brake materials. The effects of surface coatings on the anti carburizing and thermal fatigue resistance of the steel back and the bonding properties between the steel back and friction materials were studied. The results show that Ni coating on the surface can not prevent the carburization of the graphite backing plate to the steel back during pressure sintering, while the surface plating of Cu or Cu + Ni can effectively prevent the carburization of the steel back. Under the condition of thermal fatigue, the strength and hardness of the steel back coated with Ni are improved by carburizing, and the bonding strength with friction material is good, but it is easy to warp and crack. The back plates coated with Cu and Cu + Ni are not easy to warp, deform and crack. The bonding strength between Cu plated back plate and friction materials is poor. The bonding strength between the steel back coated with Cu + Ni and the friction material is good.
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2020, Vol. 25 
