High purity ceramic abradable coatings

Details High purity ceramic abradable coatings High purity ceramic abradable coatings

2011-06-07

2011-06-07

McNeil, Jennifer C (Department: 1784)

Stock material or miscellaneous articles

Composite

Of metal

C428S469000, C428S632000, C428S633000, C428S640000, C428S323000, C428S701000, C428S698000, C427S453000, C427S446000, C416S24100B, C416S24100B

Reexamination Certificate

active

07955707

ABSTRACT:
The invention is directed to a material and method for obtaining a ceramic abradable system for high temperature applications. High purity partially stabilized zirconia and/or hafnia base material has higher sintering resistance compared to conventional 6-9 weight percent yttria stabilized zirconia systems. The benefits of these systems are higher service lifetime and low thermal conductivity to achieve high operating temperatures. System includes a superalloy substrate, oxidation resistant bond coat and a thick ceramic abradable top coat. Total coating thickness is about 0.5-5 mm. In some applications an intermediate layer of high purity partially stabilized zirconia or a partially stabilized YSZ/MCrAlY cermet is applied over the oxidation resistant bond coat. In other applications an abradable system is applied on top of a grid. Additional benefits should be reduced blade wear at high operating conditions.

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