Abstract
Formulating or designing friction materials is a very complex endeavor because of the difficulty of characterizing all the effects and interactions of each of the various constituents of a given friction product. Within this work the effect of three differently modified phenolic resins on the mechanical properties and the friction performance of the finished brake blocks was studied. The selected modifications altered the B-transformation time, which refers to the time needed for a resin to cure and it is an important parameter regarding productivity and homogeneous resin dispersion throughout the finished product. The characterization work entailed the physical and mechanical analysis of the blocks (hardness, density and compression tests). A full-scale inertia dynamometer was used for the friction performance analysis. Materials based on resins with medium and short B-transformation times showed similar results. Only the material using the resin with longest B-transformation time showed significant differences in average friction level, speed fade and instantaneous friction evolution. Furthermore, this material revealed metallic inclusions on the surface, commonly known as metal pick-up. All variables considered to be constant, the metal pick-up might be linked to this particular resin modification, although no significant differences were found in the plateau microstructure studied by SEM.
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