Patent ID: 9624583
Date: 2017-04-18
CPC Classifications: C04B,C23C,F01D,F05D,Y10T

Claim:
1. A method comprising: depositing a first coating over at least a portion of a substrate, wherein the substrate comprises at least one of a superalloy, a ceramic, or a ceramic matrix composite, wherein the substrate defines a surface imperfection, and wherein a surface of the first coating opposite the substrate substantially reproduces the surface imperfection; depositing from a slurry a second coating over at least a portion of the surface of the first coating, wherein, upon deposition of the second coating, a surface of the second coating opposite the first coating does not substantially reproduce the surface imperfection, and wherein the second coating comprises mullite and at least one of a rare earth silicate, a rare earth oxide, boron oxide, an alkali metal oxide, an alkali earth metal oxide, barium strontium aluminosilicate, barium aluminosilicate, strontium aluminosilicate, calcium aluminosilicate, magnesium aluminosilicate, or lithium aluminosilicate; and reacting the mullite with the at least one of the rare earth silicate, the rare earth oxide, boron oxide, the alkali metal oxide, the alkali earth metal oxide, barium strontium aluminosilicate, barium aluminosilicate, strontium aluminosilicate, calcium aluminosilicate, magnesium aluminosilicate, or lithium aluminosilicate to form at least one of a rare earth aluminosilicate glass phase, an alkali aluminosilicate glass phase, an alkali earth aluminosilicate glass phase, or a borosilicate glass phase.