| 简介 |
Environmental barrier coatings for high temperature ceramic components, the barrier coatings including a bond coat layer including silicon; an optional silica layer; 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 mullite, BSAS, or a mullite/BSAS mixture; and from 0% to about 15% by volume of the transition layer of a secondary material selected from rare earth oxide, rare earth disilicate, rare earth monosilicate, rare earth elements, rare earth containing aluminosilicate glass, rare earth and alkaline earth containing aluminosilicate glass, rare earth aluminates, phosphorous pentoxide, phosphorous containing aluminosilicate glass, phosphorous and alkaline earth containing aluminosilicate glass, aluminum orthophosphate, aluminum oxide, and combinations thereof; and an outer layer including : from about 85% to about 100% by volume of the outer layer of a primary outer material comprising BSAS; and from 0% to about 15% by volume of the outer layer of the secondary material wherein a reaction between a sintering aid in the coating and at least one of the primary transition material or the primary outer material results in the transition layer comprising a porosity of from 0% to about 30% by volume of the transition layer, and the outer layer comprising a porosity of from 0% to about 15% by volume of the outer layer. |
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