A method of applying a thermal barrier coating to a superalloy article and a thermal barrier coating

A ceramic thermal barrier coating layer (28) for a superalloy article (20) is caused to adhere to the superalloy article (20) by applying platinum to the superalloy article (20) and heat treating at a temperature of 1100 DEG C to 1200 DEG C for one hour. This causes aluminium to diffuse from the sup...

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Hauptverfasser:	DAVID STAFFORD RICKERBY, STANLEY RUSSEL BELL, RODNEY GEORGE WING
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINE PLANTS IN GENERAL HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ENGINES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION WEAPONS
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Beschreibung
Zusammenfassung:	A ceramic thermal barrier coating layer (28) for a superalloy article (20) is caused to adhere to the superalloy article (20) by applying platinum to the superalloy article (20) and heat treating at a temperature of 1100 DEG C to 1200 DEG C for one hour. This causes aluminium to diffuse from the superalloy article (20) into the platinum to form a platinum enriched outer layer (24) which generally comprises a platinum enriched gamma phase (36) and a platinum enriched gamma prime phase (38). An alumina layer (26) is formed between the platinum enriched outer layer (24) and a ceramic coating (28). The platinum enriched gamma phase (36) and the platinum enriched gamma prime phase (38) in the outer layer (24) reduces the migration of transition metal elements to the ceramic coating (28) to enable a very pure alumina layer (26) to be formed.