METHOD FOR MAKING SOLVENT BASED ENVIRONMENTAL BARRIER COATINGS USING SINTERING AIDS

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Methods for making an environmental barrier coating using a sintering aid including combining at least an organic solvent, and a primary transition material such as a rare earth disilicate, or a doped rare earth disilicate to produce a transition layer slurry; applying the transition layer slurry to the component; drying the component having the applied transition layer slurry; infiltrating a sol-gel solution containing an aqueous solution of a water soluble salt sintering aid, or an organic solvent solution of a solvent soluble salt sintering aid into the applied slurry; and sintering the component to produce the environmental barrier coating having at least the bond coat layer, and a transition layer wherein during sintering, a reaction between the primary transition material and the sintering aid results in the transition layer having a porosity of from 0% to about 15% by volume of the transition layer.