Abstract: A coating method is disclosed including forming a first layer on a substrate and forming a second layer on the first layer. Forming the first layer includes applying virgin powder particles containing at least one rare-earth doped ceramic oxide onto the substrate. Forming the second layer includes applying recycled powder particles containing the at least one rare-earth doped ceramic oxide and at least one extraneous material onto the first layer. Another coating method is disclosed including mixing the virgin powder particles with the recycled powder particles to form a mixture of powder particles, and applying the mixture of powder particles onto the substrate. A coated article is disclosed including a substrate and a coating on the substrate, the coating including virgin powder particles of at least one rare-earth doped ceramic oxide and recycled powder particles including the at least one rare-earth doped ceramic oxide and at least one extraneous material.

Abstract: Methods and systems for in situ cleaning of internal cooling circuits of a turbine engine with detergent that provide cleaning a turbine engine that includes circumferentially arranged internal impingement cooling circuits that each include a baffle plate configured to air cool a respective surface or component of the turbine engine. Detergent is introduced through the outer wall and proximate to a back side of a baffle plate such that the detergent passes through at least aperture in the baffle plate and acts at least upon the surface or component that the baffle plate is configured to cool. The detergent may also act on the front side of the baffle plate that is proximate to the surface or component.

Abstract: A cleaning solution for a turbine engine includes water within a range between about 68.65 percent and about 99.63 percent by volume of the cleaning solution; a first organic acidic component within a range between about 0.1 percent and about 15 percent by volume of the cleaning solution; wherein the organic acid comprises citric acid; a second organic acidic component within a range between about 0.1 percent and about 15 percent by volume of the cleaning solution; wherein the organic acid comprises glycolic acid; isoropylamine sulphonate within a range between about 0.07 percent and 0.14 percent by volume of the cleaning solution; alcohol ethoxylate within a range between about 0.035 percent and 0.07 percent by volume of the cleaning solution; triethanol amine within a range between about 0.035 percent and 0.07 percent by volume of the cleaning solution; sodium lauriminodipropionate within a range between about 0.03 percent and 1.0 percent by volume of the cleaning solution.

Abstract: A cleaning solution for a turbine engine includes a reagent composition including water within a range between about 25 percent and about 70 percent by volume of the reagent composition, an acidic component within a range between about 0.1 percent and about 50 percent by volume of the reagent composition, and an amine component within a range between about 1 percent and 40 percent by volume of the reagent composition. The reagent composition is diluted with water by a factor of up to about 40 to form the cleaning solution. The cleaning solution has a pH value in the range between 2.5 and 7.0. The cleaning solution is directed towards a component of the turbine engine having a layer of foreign material thereon, to at least partially remove the foreign material from the component. The layer of foreign material is formed at least partially from at least one of thermal reaction products of the foreign material and interstitial cement.

Abstract: A cleaning solution for a turbine engine is provided. The cleaning solution includes a reagent composition including water within a range between about 25 percent and about 70 percent by volume of the reagent composition, an acidic component within a range between about 0.1 percent and about 50 percent by volume of the reagent composition, and an amine component within a range between about 1 percent and 40 percent by volume of the reagent composition. The reagent composition is diluted with water by a factor of up to about 40 to form the cleaning solution. The cleaning solution has a pH value in the range between 2.5 and 7.0. The cleaning solution is used to clean a component of the turbine engine.