DIRECTED VAPOR DEPOSITION OF ENVIRONMENTAL BARRIER COATINGS

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In some examples, a method may include directing an electron beam at a coating source to create a vapor plume, wherein the coating source comprises alumina and at least one rare earth oxide. The method also may include transporting the vapor plume using a gas stream provided adjacent to the coating source to within an internal cavity defined by a surface of a substrate of a gas turbine engine blade, vane, blade track, or combustor liner, and wherein the substrate comprises at least one of a silicon-containing ceramic or a ceramic matrix composite. Additionally, the method may include depositing the alumina and the at least one rare earth oxide from the vapor plume over the surface of the internal cavity to form a calcia-magnesia-alumina-silicate (CMAS)-resistant environmental barrier coating (EBC) comprising the alumina and the at least one rare earth oxide.