Compared with metal materials,the carbon carbon composite material has outstanding features.
1、Quality light
The density of carbon carbon composite material is only 1/4 of the steel,after using the carbon carbon composite material,it can can greatly reduce the quality of the aircraft. For example,it can reduce 816.5kg of Boeing 747-400,and can reduce 998kg of A340.
2、Energy load
Energy load is the index of absorbing the kinetic energy of the brake device,it’s usually indicated by the heat load ratio of the friction surface,the unit is J/cm2.As the heat capacity of C/C composite braking material is much higher than the powder metallurgy metal base material,so the energy load of carbon carbon composite material is 3 times higher than the powder metallurgy metal base material.
3、High temperature resistance, no deformation and no bonding phenomenon.
Because of the high strength under the high temperature,high thermal conductivity and low coefficient of thermal expansion,so the seismic performance is much better than the metal base braking material,and in the course of using, the deformation will not occur.
4、Good friction and wear,long service life.
Some researchs show that:during the brake processing,the friction coefficient of the carbon carbon composite material is stable,the curve of moment and the time is smooth,under the different conditions of speed, specific pressure and energy load,the property of friction is very stable;if ander the same conditions,it will show a good repeat performance,although under a high energy load,the moment will reduce little.
The carbon carbon composite material will have a good self-lubricating property after appropriate graphite processing,the friction rate will be 1/5 of the metal base material,so the service life will be longer,the surface of the friction will be smooth and bright. In addition,the C/C composite material can be used in overload condition.
