A method of fabricating an abradable coating of varying density, and such an abradable coating of varying density. According to the invention, the method comprises the following steps: providing a substrate (32) having a first portion with its surface situated at a first level (A), and a second portion with its surface situated at a second level (B) different from the first level; depositing a precursor material on the first and second portions of the substrate (32); compressing the precursor material between the substrate and a bearing surface; and sintering the precursor material as compressed in this way in order to obtain an abradable coating (36) having a first portion (36a) on the first portion of the substrate, and possessing a first density, and a second portion (36b) on the second portion of the substrate, and possessing a second density distinct from the first.

Abradable coating having variable densities

An example high-performance system includes an example high-performance component including a substrate and a multilayer abradable track adjacent to the substrate. The abradable track includes a plurality of alternating layers along a thickness of the abradable track. The plurality of alternating layers includes at least one relatively porous abradable layer and at least one relatively dense layer. A porosity of the relatively dense layer is lower than that of the at least one relatively porous abradable layer. The example high-performance system may include a rotating component configured to contact and abrade the multilayer abradable track. An example technique for forming the multilayer abradable track includes thermal spraying a first precursor composition toward the substrate to form a relatively porous abradable layer of a layer pair of a plurality of layer pairs of the multilayer abradable track, and a second precursor composition to form a relatively dense layer of the pair.

Multilayer abradable coatings for high-performance systems

An article includes a substrate comprising a precipitate-strengthened alloy and a coating disposed over the substrate. The alloy comprises a) a population of gamma-prime precipitates, the population having a multimodal size distribution with at least one mode corresponding to a size of less than about 100 nanometers; or b) a population of gamma-double-prime precipitates having a median size less than about 300 nanometers. The coating comprises at least two elements, and further comprises a plurality of prior particles. At least a portion of the coating is substantially free of rapid solidification artifacts. Methods for fabricating the article and for processing powder useful for fabricating the article are also provided.

Coated articles and method for making

In some examples, a system includes a blade including a blade tip and a blade track or blade shroud segment including a substrate and an abradable coating layer on the substrate. The substrate defines a leading edge and a trailing edge. The abradable coating layer includes a first tapered portion that substantially continuously tapers from a center portion of the substrate toward the leading edge of the substrate, a second tapered portion that substantially continuously tapers from the center portion of the substrate toward the trailing edge of the substrate, and a blade rub portion that extends between the first tapered portion and the second tapered portion. The abradable coating extends from the leading edge to the trailing edge, and the blade tip is configured to contact at least a portion of the blade rub portion upon rotation of the blade.

Tapered abradable coatings

Methods for preparing an environmental barrier coating and the resulting coating are provided. The methods and products include the incorporation of a continuous ceramic inner layer and a segmented ceramic outer layer on a CMC component. The segmented ceramic outer layer may be formed by thermal spray techniques. The coating is more stable at higher temperatures and provides for a longer lifetime of the coated component.

Segmented environmental barrier coating systems and methods of forming the same

A variable density coating system (81) on a component (100) is provided. In one embodiment, the variable density coating system (81) comprises: an external coating (104) on the component (100), where the external coating (104) has a first density area (90) and a second density area (92) with the first density area (90) being more dense than the second density area (92). A gas turbine engine (10) is also provided that includes a CMC component (100) with the variable density coating system (81) thereon.

Variable coating porosity to influence shroud and rotor durability

PROBLEM TO BE SOLVED: To provide materials and methods for reducing EBC wear on a CMC blade tip caused by a rub event during operation of a turbine.SOLUTION: A variable density coating system on a component is provided. In one embodiment, the variable density coating system comprises: an external coating on the component, where the external coating has a first density area and a second density area with the first density area being denser than the second density area. A gas turbine engine is also provided that includes a CMC component with the variable density coating system thereon.SELECTED DRAWING: Figure 1

David Baldiga Jonathan

Papers

Variable coating porosity to influence shroud and rotor durability

Porosity variable coating influencing shroud and rotor durability