Hybrid ceramic material composed of insulating and structural ceramic layers
AssigneeSiemens Westinghouse Power Corporation
InventorsJay A. Morrison, Michael A. Burke, Gary B. Merrill, Jay E. Lane
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Abstract
A hybrid ceramic structure (10), for use in high temperature environments such as in gas turbines, is made from an insulating layer (12) of porous ceramic that is thermally stable at temperatures up to 1700° C. bonded to a high mechanical strength structural layer (8) of denser ceramic that is thermally stable at temperatures up to 1200° C., where optional high temperature resistant adhesive (9) can bond the layers together, where optional cooling ducts (11) can be present in the structural layer and where hot gas (14) can contact the insulating layer (12) and cold gas (15) can contact the structural layer (8).
Claims31
A hybrid structure for use in high temperature applications, comprising:
- a ceramic insulating layer having a thickness of ≧1 mm, and a thermal conductivity Kth<4 W/mK, and having a conductivity/thickness ratio less than 2000 W/m2K, wherein the ceramic insulating layer is thermally stable and non-sinterable at temperatures of at least 1200° C.;
- and
- a structural ceramic layer wherein the structural ceramic layer has higher mechanical strength and lower temperature capability than the ceramic insulating layer, and wherein the ceramic insulating layer and structural ceramic layer are bonded together.
An apparatus for use in high temperature applications, the apparatus comprising:
- a structural layer of ceramic matrix composite material;
- and
- a ceramic insulating layer disposed over a surface of the structural layer, the ceramic insulating layer comprising a conductivity/thickness ratio less than 2000 W/m2K.
Dependencies are inferred from the claim text.