Effect of copper fiber on performance of automotive friction materials

Abstract

Based on a mature formula of resin based friction material, the influence of copper fiber content (mass fraction) on the physical properties, mechanical properties, friction and wear properties and brake noise of friction material was studied. The results show that the density, hardness and internal shear strength of the friction material are increased with the increase of the content of copper fiber, the porosity and compression amount are decreased gradually, and the pH value has no obvious difference with the change of the content of copper fiber. Through the bench test of SAE J2521 and SAE J2522, it is found that the addition of copper fiber has little effect on the nominal friction coefficient of the friction material. Adding proper amount of copper fiber is beneficial to improve the contact state between the friction material and the surface of the dual part, stabilize the friction coefficient, and improve the anti-fading performance of the friction material; with the increase of the content of copper fiber, the wear rate of the friction material is first decreased and then slightly increased, and when the mass fraction of copper fiber is 9%, the wear rate is the lowest; adding proper amount of copper fiber is beneficial to suppress the generation of noise, when the mass fraction of copper fiber is 7%, the noise performance is the best.

Keywords

• copper fiber
• friction material
• mechanical property
• tribological property
• brake noise