SiCp/A356材料MAO膜与合成材料摩擦副的摩擦稳定性研究

doi:10.11896/cldb.21030164

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Abstract The coating stability and friction characteristics of friction pair consisting of SiCp/A356 micro-arc oxidation(MAO) coating and synthetic mate-rial under braking temperature and wet and dry friction conditions were studied, providing technical support and theoretical basis for solving the problem of scratches on the surface of SiCp/A356 material brake discs and improving braking reliability of the SiCp/A356 material brake discs and synthetic brake pads under wet conditions. In this paper, the influence of coating thickness on the stability of the MAO coating was studied through thermal shock test, while friction stability and friction mechanism of friction pair consisting of SiCp/A356 MAO coating and synthetic material were studied through disc-ring friction tests under dry and wet working conditions, respectively. With the increase of MAO coating thickness, the thermal shock performance of the MAO coating became worse, and the increase of thermal shock temperature reduced the life of the MAO coating. The MAO coating with 40 μm thickness had a good thermal shock performance under normal braking service temperature. The MAO coating improved the friction stability between SiCp/A356 material and synthetic material under dry conditions, and the friction mechanism in the friction pair was essentially the friction behavior between third body layer and synthetic material, accompanied by the adhesive wear of third body layer and slight abrasive wear. In wet conditions, MAO coating significantly improved the friction coefficient (>0.3) and maintain the friction stability between SiCp/A356 material and synthetic material, and two-body abrasive wear behavior occurred; the synthetic material was severely worn while MAO coating effectively protected the SiCp/A356 material. MAO coating used in friction pair consisting of SiCp/A356 material and synthetic material has a good coating stability and it can improve the material friction performance under wet conditions.

Key words： SiCp/A356 material micro-arc oxidation (MAO) coating thermal shock friction stability wear mechanism

Published: 10 May 2022 Online: 2022-05-09

CLC number:	TB331
	TG174.4

Fund:Fundamental Research Funds for the Central Universities (2020JBZ113).

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	YANG Zhiyong
	ZANG Jiajun
	HAN Chao
	LI Weijing
	LI Zhiqiang

Cite this article:

YANG Zhiyong,ZANG Jiajun,HAN Chao, et al. Study on Friction Stability of Friction Pair Consisting of SiCp/A356 MAO Coating and Synthetic Material[J]. Materials Reports, 2022, 36(9): 21030164-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21030164 OR http://www.mater-rep.com/EN/Y2022/V36/I9/21030164

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