CMC material for train brake systems

Abstract

A continuous carbon fibre/silicon nitride matrix composite material has been produced by an inexpensive method. According to this method, the space between 2D carbon fibre preforms is filled with a S₃ N₄ powder by a pressure infiltration method. High particle packing densities are achieved within the fibre preforms in this way. The compact body is heat treated to form a porous framework without shrinkage, and is then strengthened with an inorganic matrix synthesised from a liquid pre-ceramic polymer. The densification degree, microstructure, and thermal and mechanical properties of the composite material are characterised. The C/Si₃ N₄ composite material pyrolysed at 1300°C is considered to be a very promising material for low temperature applications such as brake discs for rapid train systems.