Low-speed airplane novel brake facing formula based on polyimide

Abstract

The invention discloses a low-speed airplane novel brake facing formula based on polyimide. The low-speed airplane novel brake facing formula is composed of, by weight, 20 parts to 25 parts of copolymer PMR polyimide prepolymer powder, 5 parts to 8 parts of nitrile rubber powder, 6 parts to 9 parts of short carbon fiber, 2 parts to 3 parts of aramid pulp, 15 parts to 20 parts of silicon dioxide powder, 20 parts to 25 parts of barium sulfate powder, 5 parts to 7 parts of aluminum trioxide powder, 3 parts to 5 parts of copper powder, 5 parts to 7 parts of iron powder, 3 parts to 5 parts of sepiolite, 3 parts to 5 parts of vermiculite, 2 parts to 3 parts of graphite powder and 5 parts to 7 parts of molybdenum disulfide. A brake facing is high in internal combination strength, high in bonding strength, stable in friction coefficient, low in wear rate and good in heat resistance, the heat fading phenomenon is weakened, no oxidation prevention processing is needed, wet friction performance is stable, the torque transmission capacity of the brake facing under the high working temperature and the wet environment is improved, and manufacturing cost is reduced effectively compared with a carbon-carbon composite brake pad.

Description

technical field [0001] The invention relates to a novel friction plate for a low-speed aircraft brake disc, belonging to the technical field of mechanical brake control. Background technique [0002] At present, there are mainly two types of brake pads for aircraft: carbon / carbon materials and powder metallurgy materials. Carbon / carbon brake materials have the disadvantages of easy oxidation, easy moisture absorption, low wet friction coefficient, small static friction coefficient, large volume, and high production cost. Powder metallurgy brake materials have the disadvantages of easy bonding at high temperature, heavy weight, short service life, obvious thermal decay, significant drop in high temperature strength, and poor thermal shock resistance. Therefore, it is necessary to develop a new type of brake friction lining formula that avoids the above defects and has excellent comprehensive performance for friction materials for small low-speed aircraft brake discs. Conte...

AI Technical Summary

Problems solved by technology

Carbon / carbon brake materials have the disadvantages of easy oxidation, easy moisture absorption, low wet friction coefficient, small static friction coefficient, large volume, and high production cost.

Powder metallurgy brake materials have disadvantages such as easy bonding at high temperature, heavy weight, short service life, obvious thermal decay, significant drop in high temperature strength, and poor thermal shock resistance.