METHOD FOR MANUFACTURING ENVIRONMENTAL BARRIER COATING USING SINTERING AID

PROBLEM TO BE SOLVED: To provide an environmental barrier coating for protecting CMC (Ceramic Matrix Composite) from a high temperature steam environment present in a gas turbine engine. SOLUTION: This method for manufacturing the environmental barrier coating comprises: a step of manufacturing tran...

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Hauptverfasser:	BOUTWELL BRETT A, KIRBY GLEN HAROLD
Format:	Patent
Sprache:	eng
Schlagworte:	AIR INTAKES FOR JET-PROPULSION PLANTS ARTIFICIAL STONE BLASTING CEMENTS CERAMICS 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 COMBUSTION APPARATUS COMBUSTION ENGINES COMBUSTION PROCESSES COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS DIFFUSION TREATMENT OF METALLIC MATERIAL ENGINE PLANTS IN GENERAL GAS-TURBINE PLANTS GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGHVELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING LIME, MAGNESIA MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES REFRACTORIES SLAG STEAM ENGINES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF NATURAL STONE WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an environmental barrier coating for protecting CMC (Ceramic Matrix Composite) from a high temperature steam environment present in a gas turbine engine. SOLUTION: This method for manufacturing the environmental barrier coating comprises: a step of manufacturing transition layer slurry by mixing a principal transition material comprising at least water, mullite, BSAS (barium strontium aluminosilicate) or mullite/BSAS mixture; a step of applying the transition layer slurry on a ceramic part 10; a step of mixing at least water and a principal external material comprising BSAS with each other to form external layer slurry; a step of applying the external layer slurry on a part coated with the transition layer slurry; and a step of manufacturing the environmental barrier coating having at least a transition layer 16 and the external layer 18. At least one of the transition layer slurry or the external layer slurry contains slurry sintering aid, the transition layer has porosity having a volume 0 to about 30 vol.% of the transition layer, and the external layer has the porosity having volume 0 to about 15 vol.% of the external layer. COPYRIGHT: (C)2011,JPO&INPIT