Friction Performance and Thermal Analysis of Carded and Needlepunched Kevlar Felt-Reinforced/Polyimide Matrix Composite Friction Materials

The objective of this paper is to announce the results of testing and analysis, including friction characteristics and thermal properties, of a friction material from a novel manufacturing process. A Kevlar felt-reinforced polyimide matrix composite (“Braketex^®”), including results with fiber modifications hybridized with glass or carbon nanofibers, is investigated. Dry brake friction testing on a dynamometer simulating various aircraft landing brake energy levels using disc samples having 4.625″ O.D. × 3.625″ I.D. (11.7475cm × 9.2075cm friction area is equal to 41.74 cm²) single friction material surfaces against cast iron and other reactor surfaces was conducted.

Thermal conductivity of Braketex was low and reactor plates absorbed most energy, showing insignificant wear below 50% of the energy level simulating a Boeing 747 normal landing. Friction stability was exhibited through approximately 80% of the landing energy. Friction transitions occurring beyond that level and continuing far beyond were observed and reported. The composites effective friction performance through energy levels simulating Rejected Takeoff and final taxiing.