| 摘要 |
PROBLEM TO BE SOLVED: To provide turbine shrouds having abradable coatings that balance contradictory requirements of high flowpath solidity, low blade tip wear, and high durability in service.SOLUTION: Methods include obtaining a coating system on a shroud substrate, and forming an abradable coating 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 and relatively porous filler regions between the relatively dense abradable scaffold. The methods also include machining the abradable coating so as to achieve a substantially smooth flowpath surface comprising a relatively porous abradable phase surrounded by a relatively dense, high-durability corralling phase. |
