Influence of novolac phenolic resins and butadiene rubbers on airborne wear particles emission from train brake friction materials against steel brake discs with roughness of Ra2.5

Three train brake materials based on straight or resorcinol-modified novolac phenolic resin and nitrile or styrene-butadiene rubber were tested during pin-on-disc tribological tests. Each material was tested and retested at 9 different friction regimes with various contact pressure values (0.33, 0.66 and 1 MPa) and various sliding velocity values (0.6,...