Abradable coating with safety fuse

摘要

An abradable coating (60;70) for interaction with tips of airfoils (such as vanes (26) or blades (28) of a compressor of a gas turbine engine) includes a metal bond coat (62;72), a ceramic layer (64;74), and an abradable layer (66;76). The ceramic layer on the metal bond coat provides insulation and acts as a fuse that is adapted to spall off upon high rub interaction. The abradable layer on the ceramic layer contacts the tips of the airfoils during operation of the compressor. The abradable layer is sufficiently abradable to roundup the coating by contact with the airfoil tips.