EFFECT OF FRICTION MODES ON FRICTION PROPERTIES OF CU-SIO₂ COMPOSITES 

Fei GAO¹

gaofei@djtu.edu.cn

Rong FU¹

Baoyun SONG¹

Yves BERTHIER²

yves-berthier@insa-lyon.fr

¹ Department of Material Science and Engineering, Dalian Jiaotong University, Dalian, China

 ² Laboratoire de Mécanique des Contacts et des Solides, Institut National des Sciences Appliquées de Lyon, France

Abstract. The effects of content and granularity of SiO₂ on friction and wear performance of copper matrix composites depend on friction conditions. Cu-SiO₂ composites are prepared through powder metallurgy for this study. The effects of SiO₂ content, SiO₂ granularity and different friction modes on the friction performance of the materials were searched at friction speeds of 1.6 ~ 47.1 m/s. The results show that the friction coefficient and wear rate increase with increasing SiO₂ content, the SiO₂ granularity has negligible effect, and the friction mode affects the friction and wear considerably as a result of its influence on the configuration of the third bodies. The third bodies formed in high speed friction are continuous and compact, leading to reduced wear rate and decreased fluctuation in the friction coefficient with the change in friction speed.
 

Keywords: copper matrix frictional materials, wear, third body, granularity, SiO₂