CMC material for train brake systems

A continuous carbon fibre/silicon nitride matrix composite material has bee n produced by an inexpensive method. According to this method, the space be tween 2D carbon fibre preforms is filled with a S3N4 powder by a pressure i nfiltration method. High particle packing densities are achieved within the fibre preforms in this way. The compact body is heat treated to form a por ous framework without shrinkage, and is then strengthened with an inorganic matrix synthesised from a liquid pre-ceramic polymer. This densification d egree, microstructure, and thermal and mechanical properties of the composi te material are characterized. The C/Si3N4 composite material pyrolysed at 1300 degreesC is considered to be a very promising material for low tempera ture applications such as brake discs for rapid train systems. BCT/441.