WATER BASED ENVIRONMENTAL BARRIER COATING FOR HIGH TEMPERATURE CERAMIC COMPONENT

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PROBLEM TO BE SOLVED : To provide environmental barrier coatings for protecting CMCs from the high temperature steam environments present in gas turbine engines. SOLUTION : The environmental barrier coatings 12 for high temperature ceramic components 10 comprises a bond coat layer 14, an optional silica layer 15, and at least one transition layer 16 including from about 85% to about 99% by volume of the transition layer of a primary transition material comprising a rare earth disilicate, or a doped rare earth disilicate, and from 1% to about 15% by volume of the transition layer of a secondary material selected from the group consisting of Fe2O3, iron silicates, rare earth iron oxides, Al2O3, mullite, a material comprising a doping composition as defined previously, and mixtures thereof, wherein the transition layer is applied to the component as a slurry comprising at least water, the primary transition material and a sintering aid, and wherein a reaction between the 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. COPYRIGHT : (C)2011, JPO&INPIT