Metal-ceramic turbine shroud and method of making the same
AssigneeGeneral Electric Company
InventorsAlbert P. Sterman, Charles H. Gay, Jr., Frederick W. Tegarden, Dean T. Lenahan, Martin C. Hemsworth
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Abstract
A turbine shroud includes a ceramic sealing layer secured to a metal substrate. In one form, the metal substrate includes a plurality of pegs extending therefrom. Intermediate bonding layers are disposed on the peg-metal substrate structure. A ceramic sealing layer of zirconium oxide with about 20 weight percentage magnesium oxide is disposed, e.g., plasma sprayed, on the intermediate bonding layers. The ceramic sealing layer includes an ordered pattern of very fine cracks therein which reduce the thermal stress in the ceramic sealing layer. A method of constructing a turbine shroud structure is also disclosed.
Claims14
A turbine shroud structure of the type having a metal substrate and a ceramic sealing layer secured thereto, wherein the improvement comprises:
- mechanical matrix bonding means disposed between said metal substrate and said ceramic sealing layer and bonding said ceramic sealing layer to said metal substrate with said ceramic sealing layer including an ordered pattern of very fine cracks which reduce the thermal stress in said ceramic sealing layer.
A method of constructing a turbine shroud structure, comprising the steps of:
- (a) providing a metal substrate;
- (b) providing said metal substrate with mechanical matrix bonding means having a predetermined spatial configuration, and then
- (c) applying a ceramic sealing layer to said mechanical matrix bonding means and causing said ceramic sealing layer to develop an ordered pattern of very fine cracks therein which reduce the thermal stress in said ceramic sealing layer.
Dependencies are inferred from the claim text.