Al_2O_3含量对铜基粉末冶金摩擦材料摩擦磨损性能的影响

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。

Effect of Al2O3 content on friction and wear properties of copper-based powder metallurgy friction materials

The effect of Al2O3 content on friction and wear properties of copper matrix composite prepared by pow-der metallurgy method was investigated. The results demonstrate that the effects of Al2O3 on the friction and wear performance of the materials are closely related to the friction speed. With increasing of Al2O3 content,hardness and friction coefficient of Cu-based friction materials increase,density decreases and the wear extent decreases firstly and then increases subsequently. When Al2O3 content is 9%(mass percent),friction coefficient of the materi-al is high and stable,wear rate is the lowest. The friction surface displays a rough morphology with a number of wide scars when the material does not contain Al2O3. The scars decrease and even disappear with increase of Al2O3 content. The dispersed Al2O3 particles can strengthen the surface hardness of the material,causing the wear rate de-creasing.