Abstract: A method of measuring creep strain in a gas turbine engine component, where at least a portion of the component has a material disposed thereon, and where the material has a plurality of markings providing a visually distinct pattern. The method may include capturing an image of at least a portion of the markings after an operational period of the gas turbine engine, and determining creep strain information of the component. The creep strain information may be determined by correlating the image captured after the operational period to an image captured before the operational period.

Abstract: A method of measuring creep strain in a gas turbine engine component, where at least a portion of the component has a material disposed thereon, and where the material has a plurality of markings providing a visually distinct pattern. The method may include capturing an image of at least a portion of the markings after an operational period of the gas turbine engine, and determining creep strain information of the component. The creep strain information may be determined by correlating the image captured after the operational period to an image captured before the operational period.

Abstract: In order to minimize a clearance between a turbine and its housing, and thus, improve the efficiency of a turbine engine, an abradable coating can be applied to an inner surface of the turbine housing. However, there are no known abradable coatings that can be applied to a housing that is subjected to temperatures between 950–1500° F. for extended periods of time. The apparatus of the present disclosure includes a housing including a 950–1500° F. section in which at least one rotating blade row is positioned. The rotating blades and the 950–1500° F. section each includes a surface being comprised of a relatively non-abradable material. The surface of the housing comprised of the relatively non-abradable material is covered by a 950–1500° F. relatively abradable coating that includes a metallic matrix and at least one of a thermoplastic and dry lubricant. The metallic matrix is 55–85% of the coating by volume.