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US 5,397,649 AGranted
Intermediate coating layer for high temperature rubbing seals for rotary regenerators
AssigneeAlliedSignal Inc.
InventorsJames L. Schienle, Thomas E. Strangman
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Abstract
A metallic regenerator seal is provided having multi-layer coating comprising a NiCrAlY bond layer, a yttria stabilized zirconia (YSZ) intermediate layer, and a ceramic high temperature solid lubricant surface layer comprising zinc oxide, calcium fluoride, and tin oxide. Because of the YSZ intermediate layer, the coating is thermodynamically stable and resists swelling at high temperatures.
Claims7
A sealing member having a low coefficient of friction and good resistance to oxidation at high temperatures when rubbing against a ceramic material comprising:
- a superalloy substrate;
- a bonding layer of MCrAlY, where M is selected from the group consisting of Ni, Co, NiCo, and Fe;
- a ceramic layer of stabilized zirconia, or stabilized hafnia;
- and
- a ceramic solid lubricant layer, said lubricant layer having some calcium fluoride.
2 more elements
Dependencies are inferred from the claim text.