SiO_2对铜基摩擦材料摩擦磨损性能的影响

Friction properties of Cu-SiO_2 sintered friction materials

为了提高铜基摩擦材料在高速干摩擦条件下的耐磨性能和具有稳定的摩擦系数,通过粉末冶金方法,制备了铜-SiO2摩擦材料.在摩擦速度为1.6～47.1 m/s条件下,研究了SiO2含量、粒度及摩擦方式对材料摩擦磨损性能的影响.研究表明:材料的摩擦系数和磨损率随着SiO2含量的增加而略有增大;SiO2颗粒尺寸的变化,对摩擦系数影响不显著;摩擦方式对材料的摩擦磨损性能的影响明显.SiO2含量增加有利于提高摩擦系数归因于增加了摩擦面高硬度质点的数量.干摩擦条件下影响材料摩擦磨损性能的一个重要因素是摩擦方式.在高速摩擦条件下,形成的第三体组织致密而连续,这种致密而连续的第三体有利于降低磨损量,并明显降低由于摩擦速度不同而导致的摩擦系数的波动程度.

To improve the wear resistance while maintaining a stable friction coefficient of Cu-based friction materials under high-speed dry friction conditions, Cu - SiO2 friction materials were prepared through the powder metallurgy method. The effects of content and granularity of SiO2, and the mode of friction on friction and wear properties of the materials were studied at friction speeds of 1.6 -47.1 m/s. The research demonstrates that ： the friction coefficient and the wear rate increase slightly with the increase of SiO2 content; the change of SiO2particle size has no significant impact on the friction coefficient; the friction mode has considerable influence on friction and wear properties. The increase of friction coefficient with the increasing SiO2eontent is ascribed to the increased number of high-hardness particles on the friction surfaces. A key factor affecting friction and wear properties of the materials under dry friction conditions is the friction mode. The dense and continuous morphology of the third bodies formed at high friction speed helps to lower the wear rate, and apparently decreases the fluctuation of the friction coefficient caused by the friction speed variation.