Effect of copper powder third body on tribological property of copper-based friction materials

摘要

Tribological property of copper-based friction materials with exogenous copper powder third body was investigated. Friction tests were conducted under the friction speeds (100-1500 rpm) and pressures (0.25 MPa, 0.38 MPa and 0.51 MPa) by a pin-on-disc tribometer. The results indicate that the friction coefficient can be average increased by 0.03 by the presence of exogenous copper powder on the friction surface compared with the non-exogenous copper-based friction materials. There are two main reasons: exogenous copper powder third body increases the actual contact area; exogenous copper powder particles are compacted forming dense third body. But, for non-exogenous copper-based friction materials, less particles and the piece shape nature third bodies are compacted, which consume less friction force leading to lower friction coefficient. (C) 2015 Elsevier Ltd. All rights reserved.