B<sub>4</sub>C改性Cu基刹车片配对C/C-SiC的摩擦学行为及机理

doi:10.19976/j.cnki.43-1448/TF.2023026

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Abstract Copper based brake pads have the problems of matrix softening and friction film breaking during high-speed cycle braking. Cu-based brake pads with boron carbide (B₄C) mass fraction of 0-6% were prepared using powder metallurgy (PM) method, and C/C-SiC brake discs were selected as dual components to study the effect of B₂O₃ friction film formed during the braking process on friction and wear performance, and to analyze the wear mechanism. The results show that the density of copper based friction materials can be reduced by modifying with B₄C. When the mass fraction of B₄C is 4% and 6%, the material density significantly decrease and the strength increase, and the most excellent thermal degradation resistance and the lowest wear rate are obtained, respectively. During the braking process, B₂O₃ formed by B₄C oxidation has a layered crystal structure similar to MoS₂ and graphite, which is easy to shear at the sliding interface, thereby improving the mean friction stability coefficient and reducing wear rate. B₂O₃ formed on the surface of B₄C combines well with the Cu matrix. When the mass fraction of B₄C exceeds 4%, the wear mechanism of Cu-based brake pads shifts from delamination wear to oxidation wear.

Key words： B₄C B₂O₃ Cu-based brake pads C/C-SiC wear mechanism

Received: 24 March 2023 Published: 06 July 2023

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	LUO Yong
	LI Zhuan
	WU Jiaqi

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LUO Yong,LI Zhuan,WU Jiaqi. Tribological performance and mechanism of B₄C modified Cu-based brake pads mated with C/C-SiC[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(3): 262-275.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023026 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I3/262

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