Patent ID: 7842335
Filing Date: 2010-11-30
Classification: C09D,C23C,F01D,F05D,F23R,Y02T

Abstract:
1. A method for locally repairing a damaged thermal barrier coating on a component surface, the method comprising the steps of: providing a ceramic coating composition comprising ceramic powders provided in two predetermined particle size ranges of less than 1 micron but greater than 30 nanometers and between about 45 microns to about 75 microns, respectively, at least one nano-sized ceramic material having a particle size of no greater than 30 nanometers, and a binder, the binder being chosen from the group consisting of ceramic precursor binders that thermally decompose to form a refractory material, an accelerant, and a solvent, the composition mixed to uniformly distribute the ceramic powders, nano-sized ceramic material, the binder, the accelerant, and the solvent; applying the ceramic coating composition on a surface area of the component exposed by the localized damage; mechanically smoothing the composition to form an uncured coating, the uncured coating composition characterized by the ability to flow when subjected to a mechanical stress and the ability to remain in place when the mechanical stress is removed; and evaporating the solvent and curing the coating composition for a period sufficient to yield a dried coating that covers the surface area of the component, the dried coating comprising the ceramic powders and nano-sized ceramic material in a polymeric matrix.