METHODS OF MANUFACTURING A SHROUD ABRADABLE COATING

摘要

Methods (200,300,400,500) of manufacturing turbine shrouds (10) with an abradable coating (14) that balance the apparently contradictory requirements of high flowpath solidity, low blade tip wear, and good durability in service. The methods include obtaining a shroud substrate (12). The methods may include obtaining a coating system on the shroud substrate. The methods include forming an abradable coating (14) on a surface of the coating system so as to form a substantially smooth flowpath surface. Forming the abradable coating includes forming a relatively dense scaffold (16) and relatively porous filler regions (18) in-between the relatively dense abradable scaffold. The methods may also include machining the abradable so as to achieve a substantially smooth flowpath surface comprising a relatively porous abradable phase surrounded by a relatively dense, high-durability corrale phase.