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| Effects of SiO2 and ZrO2 on friction and wear properties of copper-based friction materials mated with C/C-SiC composites |
| LI Chenxin, LIU Rutie, LIN Xueyang, CHEN Jie, XIONG Xiang, LIAO Ning |
| State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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Abstract SiO2 and ZrO2 were added to powder metallurgy Cu-based friction materials respectively. The effects of SiO2 and ZrO2 on the friction and wear properties of powder metallurgy Cu-based friction materials mated with C/C-SiC composites were studied, and the internal relationship between their influence mechanisms was analyzed. The results show that the Cu-based friction materials containing SiO2 or ZrO2 can achieve high average friction coefficient (0.375 8 and 0.342 4 respectively) at high braking speeds when they is mated with C/C-SiC composites. The wear of the friction materials are very low, which is 1.44 μm/time and 0.95 μm/time respectively, and the C/C-SiC composites has almost no wear. During the braking process, SiO2 is easy to fall off and form abrasive particles, causing abrasive wear on the two friction surfaces. However, ZrO2 remains intact in the matrix, which mainly ploughs the friction surface of C/C-SiC composites in the form of hard micro bumps. SiO2 is easily embedded in the friction film of C/C-SiC composites after breaking and falling off at high braking speed, which is conducive to the accumulation of wear debris mainly composed of Cu and Cu compounds around it, and promotes the formation of friction transfer film on the friction surface of C/C-SiC composites to improve the friction and wear properties of the materials.
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Received: 15 November 2022
Published: 23 March 2023
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2023, Vol. 28 
