| 摘要 |
PROBLEM TO BE SOLVED: To provide turbine shroud abradable coatings that balance contradictory requirements of high flowpath solidity, low blade tip wear, and high durability in service.SOLUTION: Shrouds 10 include a shroud substrate 12, a coating system, and an abradable coating 14. The coating system overlies at least a portion of an outer surface of the shroud substrate. The coating system includes a bond coat, a thermal barrier coating (TBC), and/or an environmental barrier coating (EBC). The abradable coating overlies at least a portion of the barrier coating. The abradable coating defines a substantially smooth continuous flowpath surface. The abradable coating includes a hybrid microstructure including a relatively dense, high-durability phase corralling relatively porous abradable phases. Second regions are more abradable by turbine blades 100 than first regions. |
