Abstract
KEYWORDS – Friction Pair, Wear Mechanisms, Organic and Sinter Brake Pad, Wear Debris
ABSTRACT
In line with the development of brake discs for application in high speed trains, the question of optimizing this wear system from the material point of view arose. Therefore the detailed characterization of the wear behavior of the brake disc and pad is required under realistic operational conditions.
In a test facility, which simulates the braking by applying defined load spectra, similar to the realistic ones of high speed trains, a certain number of tests have been carried out. As friction pair, a massive steel disc with a diameter of 460 mm and 20 mm thickness was tested against commercial organic and sinter brake pads.
Firstly the brake disc material, as well as the pads, were characterized concerning chemical composition, hardness and microstructure, including appearing phases. To identify the acting wear mechanisms during the test, the resulting wear debris were analyzed after different stages (number of stops), by means of SEM and EDX to gain more information about possible wear driven reactions between disc and pads at elevated temperature as well. Moreover wear debris were classified by density.
The test rig is located at Faiveley Transport in Witten, the investigation of the materials was carried out at the Chair of Materials Technology, Ruhr-Universität Bochum, Germany in the course of a cooperation project with Faiveley and CMT RUB.