铜基粉末冶金刹车材料支撑背板表面镀层对防渗碳性能的影响

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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.

Key words： powder metallurgy brake material steel back surface coating carburizing

Received: 16 October 2020 Published: 18 January 2021

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TG142.1

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	Articles by authors
	CAO Wenming
	YAO Pingping
	ZHOU Haibin
	ZHAO Lin
	XU Liang
	XIAO Yelong

Cite this article:

CAO Wenming,YAO Pingping,ZHOU Haibin, et al. Effect of coating on steel back of Cu-based powder metallurgy brake materials on carburizing resistance[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(6): 538-544.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I6/538

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