Strain-tolerant ceramic coated seal
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. An array of discontinuous grooves is laser machined into the outer surface of the solid lubricant surface layer making the coating strain tolerant.
Claims17
A sealing member having a low coefficient of friction and good resistance to oxidation at high temperatures when sealing against a ceramic material comprising:
- a superalloy substrate;
- a first ceramic layer over said substrate;
- an outer layer, over said first layer, of a ceramic solid lubricant having at least one constituent with a melting point less than the melting point of stabilized zirconia, said outer layer having an outer surface for sealingly engaging said ceramic material, and having a segmented morphology configured to render said outer layer more tolerant to strain.
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 first ceramic layer;
- a second layer of a ceramic solid lubricant, said second layer having an outer surface with an array of discontinuous grooves, said array consisting of a repeating two row pattern comprising a first row in which adjacent grooves are orthogonal to each other and a second row in which adjacent grooves are parallel.
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 first ceramic layer;
- a second layer composed in its entirety or in combination of calcium fluoride, zinc oxide, tin oxide, and nickel oxide, said second layer having an outer surface with a segmented morphology.
Dependencies are inferred from the claim text.