FRICTION COMPOSITE MATERIAL AND METHOD OF ITS MANUFACTURE Russian patent published in 1999 - IPC

FIELD: friction monodisks of aircraft brakes. SUBSTANCE: carbon-carbon composite material has carcass consisting of discrete carbon fibres of more than two standard sizes of length; carbon matrix consists of glass-reinforced carbon, pyrocarbon obtained from gas phase by means of temperature gradient and carbon obtained by heat treatment of coal-tar pitch at the following ratio of components (percent by volume): carbon fibers, 25 to 45; glass-reinforced carbon, 4 to 6; pyrocarbon, 32 to 55 and carbon from pitch coke, remainder. Method of obtaining composite material includes pressure molding of mixture of discrete carbon fibres of more than two standard sizes in length and carbon-containing agents followed by carbonization and graphitization; provision is made for preliminary pressure molding of mixture of discrete carbon fibers and thermosetting resin at pressure of 7 to 14 MPa and temperature of 150 C; mixture thus obtained is hardened, carbonized and saturated with pyrocarbon from gas phase by method of temperature gradient of 1.58 to 1.72 g/cu.cm, after which it is graphitized and finally saturated with carbon from pitch coke by liquid phase method in cycle including saturation by melt of pitch under pressure, carbonization and graphitization. EFFECT: enhanced efficiency of braking due to increased dynamic friction coefficient at retained physico-mechanical, thermophysical, friction wear characteristics and wear resistance of material. 3 cl