Abradable coating in a gas turbine engine

Details Abradable coating in a gas turbine engine Abradable coating in a gas turbine engine

1993-11-09

1995-12-05

Look, Edward K.

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

Between blade edge and static part

4151744, 415200, 4284735, 523219, F01D 1112, B32B 2706, B32B 2720, B32B 2728

Patent

active

054723159

ABSTRACT:
An abradable coating is provided for use on a composite substrate which has a coefficient of thermal expansion substantially similar to that of the substrate and which is formed with a matrix resin of the same type of resin used to form the substrate. In particular, with a composite substrate formed from carbon or graphite fibers impregnated with a polyimide resin, an abradable coating formed from carbon or glass microballoons in a polyimide resin matrix has been found to avoid delamination as a result of thermal cycling between -65.degree. F. and 500.degree. F. Accordingly, that abradable coating is particularly suitable for use with composite compressor shrouds in gas turbine engines and aircraft auxiliary power units.

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