Water based environmental barrier coatings for high temperature ceramic components

a technology of ceramic components and environmental barriers, applied in water-setting substances, blade accessories, machines/engines, etc., can solve the problems of unsatisfactory effects, inability to stabilize silicon oxide in high-temperature steam, and increased durability of high-temperature engine components
US20110027559A1Inactive Publication Date: 2011-02-03GENERAL ELECTRIC CO
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
GENERAL ELECTRIC CO
Publication Date
2011-02-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

Environmental barrier coatings for high temperature ceramic components including: a bond coat layer; an optional silica layer; and at least one transition layer including: from about 85% to about 100% by volume of the transition layer of a primary transition material selected from a rare earth disilicate, or a doped rare earth disilicate; and from 0% to about 15% by volume of the transition layer of a secondary material selected from Fe2O3, iron silicates, rare earth iron oxides, Al2O3, mullite, rare earth aluminates, rare earth aluminosilicates, TiO2, rare earth titanates, Ga2O3, rare earth gallates, NiO, nickel silicates, rare earth nickel oxides, Lnb metals, Lnb2O3, Lnb2Si2O7, Lnb2SiO5, borosilicate glass, alkaline earth silicates, alkaline earth rare earth oxides, alkaline earth rare earth silicates, and mixtures thereof; where the transition layer is applied to the component as a slurry including at least water, the primary transition material and at least one slurry sintering aid, and where a reaction between the slurry sintering aid and the primary transition material results in the transition layer having a porosity of from 0% to about 15% by volume of the transition layer.
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Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This Application claims priority to U.S. Provisional Application Ser. No. 61 / 230,262, filed Jul. 31, 2009, which is herein incorporated by reference in its entirety.TECHNICAL FIELD

[0002] Embodiments described herein generally relate to water based environmental barrier coatings for high temperature ceramic components. More particularly, embodiments herein generally describe water based environmental barrier coatings comprising sintering aids for use on high temperature ceramic components.BACKGROUND OF THE INVENTION

[0003] Higher operating temperatures for gas turbine engines are continuously being sought in order to improve their efficiency. However, as operating temperatures increase, the high temperature durability of the components of the engine must correspondingly increase. Significant advances in high temperature capabilities have been achieved through the formulation of iron, nickel, and cobalt-based superalloys. While superalloys hav...

Claims

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