Abstract

Brake pad is a complex, multicomponent system consisting of reinforcing agents, abrasives, lubricants, binders, fillers and in some cases elemental metals. Numerous mechanical properties of this system are required and are related to the distribution of components in its volume. Friction layer is in contact with cast iron disc and distribution of single components there is crucial for the braking process. Due to high pressure and temperature achieved, various changes of chemistry and morphology during braking process occur. In this study commercially available automotive brake pads and newly developed brake pads modified with kaoline were investigated using light optical digital microscopy and scanning electron microscopy with EDS which enabled to create maps of elemental distribution. New unused brake pads and pads after AK master braking procedure were investigated. Combination of two microscopic techniques provided detailed information about the structure and its changes in such a complex system as brake pad is. This information will help to understand the process of friction layer formation and wear particles emissions.

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