Environmental barrier coating and methods of preparation
AssigneeGeneral Electric Company
InventorsAtanu SAHA, Nicholas Edward ANTOLINO, Don Mark LIPKIN
Life of this patent
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Abstract
Methods of forming an environmental barrier coating are disclosed. A method includes disposing a powder-based coating on a substrate, heat-treating the powder-based coating at a temperature greater than 800° C. and less than 1200° C. to form a porous coating that includes surface-connected pores, infiltrating at least some of the surface-connected pores of the porous coating with an infiltrant material to form an infiltrated coating, and sintering the infiltrated coating at a temperature greater than 1200° C. and less than 1500° C. to form the environmental barrier coating on the substrate.
Claims21
A method of forming an environmental barrier coating, comprising:
- disposing a powder-based coating on a substrate;
- heat-treating the powder-based coating at a temperature greater than 800° C. and less than 1200° C. to form a porous coating comprising surface-connected pores;
- infiltrating at least some of the surface-connected pores of the porous coating with an infiltrant material to form an infiltrated coating;
- and
- sintering the infiltrated coating at a temperature greater than 1200° C. and less than 1500° C. to form the environmental barrier coating on the substrate.
A method of forming an environmental barrier coating, comprising disposing a powder-based coating on a substrate by contacting the article with a first slurry;
- heat-treating the powder-based coating at a temperature greater than 1050° C. and less than 1200° C. to form a porous coating comprising surface-connected pores;
- infiltrating at least some of the surface-connected pores of the porous coating with a second slurry to form an infiltrated coating;
- and
- sintering the infiltrated coating at a temperature greater than 1200° C. and less than 1400° C. to form the environmental barrier coating on the substrate, wherein
- a thickness of the environmental barrier coating is greater than 100 microns;
- and
- the environmental barrier coating is substantially hermetic.
Dependencies are inferred from the claim text.