Friction, wear and airborne particle emission from Cu-free brake materials. (January 2020)

• Record Type: Journal Article
• Authors: Lyu, Yezhe; Leonardi, Mara; Wahlström, Jens; Gialanella, Stefano; Olofsson, Ulf
• Is Part Of: Tribology international. Volume 141(2020)
• Publication Date: 2020-01
• Subjects: Cu-free brake pad -- Friction material -- Particles -- Wear; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2019.105959
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Cu is required to be abated in brake pads due to its toxicity. There are on the market several Cu-free brake pads. These Cu-free brake pads are only evaluated regarding their friction and wear performance, whereas, their airborne particle emissions are not considered. A pin-on-disc tribometer is used to evaluate the friction, wear and airborne particle emission from two Cu-free commercial brake pads used in the Europe. Moreover, a commercial brake pad containing Cu is evaluated as a reference. The results indicate that Cu-free brake pads yield comparable coefficient of friction as the Cu-contained brake pad. All three brake materials result in similar wear to the mating brake rotor. Cu-free brake pads generate more airborne particles than Cu-contained brake pad. Highlights: Cu-free brake pads are tested regarding friction, wear and airborne particle emission. Cu-free brake pads can build up compact friction layers. Cu-free brake pads have comparable friction and wear as Cu-contained brake pads. Cu-free brake pads emit more airborne particles than Cu-contained brake pads. Size distribution of the emitted airborne particles is analyzed.