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采用粉末冶金方法制备铜基摩擦材料,研究Al_2O_3的添加量对材料的摩擦磨损性能的影响。结果表明:Al_2O_3对材料摩擦磨损性能的影响与摩擦速度密切相关;随着Al_2O_3含量增加,材料的摩擦因数提高,密度降低,硬度增加,磨损量先减小后增大,Al_2O_3质量分数为9%时,复合材料的摩擦因数较高且稳定,磨损量最小。不含Al2O3的材料摩擦表面出现大量凹坑,磨损严重,随着Al_2O_3含量提高,凹坑数量减少,弥散分布的Al_2O_3粒子能强化基体表面强度,从而导致材料磨损量降低。
The copper-based friction material was prepared by powder metallurgy method, and the effect of Al 2 O 3 addition on the friction and wear properties of the material was studied. The results show that the effect of Al_2O_3 on the friction and wear properties is closely related to the friction speed. With the increase of Al_2O_3 content, the friction coefficient increases, the density decreases, the hardness increases, the wear volume first decreases and then increases, the mass fraction of Al_2O_3 is 9% , The friction coefficient of the composite material is high and stable, the least amount of wear. There is a large number of dimples on the frictional surface of Al2O3-free material, which leads to serious wear. As the content of Al_2O_3 increases, the number of dimples decreases. The dispersed Al_2O_3 particles can strengthen the surface strength of the matrix, resulting in the reduction of wear.