General Electric Company

Huffman Corporation

William Randall Thompson

Lawrence Bernard Kool

David Carr

Richard DiDomizio

Mitchell O Miller

Anatoli Kogan

Brian Stephen Noel

William R Pearson

Stephen Francis Rutkowski

Paul Steven Svec

Michael Francis Gigliotti, Jr

Kenneth Burrell Potter

Michael Francis X Gigliotti, Jr

Kiyokazu Watanabe

Minoru Ishida

Kazuharu Hattori

Jr Michael Francis X Gigliotti

A method and apparatus for forming raised ridges on the surface of a turbine component having an abradable coating formed on an outer surface thereof which includes a mask having a predetermined pattern of openings therein adjacent the abradable coating on a surface of the turbine component; and a high pressure water jet that has movement relative to the mask so that the high pressure water jet passes along the extent of the openings in the mask and passes through the openings in the mask to remove portions of the abradable coating on the turbine component located beneath the openings in the mask.

Method for selectively removing portions of an abradable coating using a water jet

A slurry coating composition is described, which is very useful for enriching the surface region of a metal-based substrate with aluminum. The composition includes colloidal silica and particles of an aluminum-based powder, and is substantially free of hexavalent chromium. The slurry may include colloidal silica and an alloy of aluminum and silicon. Alternatively, the slurry includes colloidal silica, aluminum or aluminum-silicon, and an organic stabilizer such as glycerol. The slurry exhibits good thermal and chemical stability for extended periods of time, making it very useful for industrial applications. Related methods and articles are also described.

Aluminizing slurry compositions free of hexavalent chromium, and related methods and articles

A method and apparatus for removing a coating having an irregular surface configuration that includes mapping the irregular surface configuration, and using the mapping determination in controlling the operation of an abrasive water jet to provide increased material removal rates at the higher points in the irregular surface and decreased material removal rates at the lower points, and thereby even out the surface configuration of the coating. The method and apparatus also includes using a detection device for detecting the presence or absence of an element that is unique to a layer of a coating, and using the detection determination in controlling the operation of the abrasive water jet to stop material removal of the coating when the detection device determines there is an absence of the unique element.

Method and apparatus for removing coatings from a substrate using multiple sequential steps

An organic coating composition is described, which can be used to enrich the surface region of a metal-based substrate with aluminum. The composition comprises an aluminum-based powder and at least one organic resin, e.g., alkyds, epoxies, or silicone materials. At least some of the aluminum-based powder is in the form of substantially spherical powder particles. The coating composition is substantially free of hexavalent chromium. It can be applied to the substrate by a variety of techniques, such as spraying. It is then heat-treated, to cause diffusion of aluminum into the surface region of the substrate, e.g., a turbine engine component. The composition exhibits good thermal and chemical stability for extended periods of time. Related articles are also described.

Organic coating compositions for aluminizing metal substrates, and related methods and articles

A method for removing a chromide coating from the surface of a substrate is described. The coating is treated with a composition which includes an acid having the formula HAF, where 'A' can be Si, Ge, Ti, Zr, Al, or Ga; and x is 1&#x2013;6. An exemplary acid is hexafluorosilicic acid. The composition may also include a second acid, such as phosphoric acid or nitric acid. In some instances, a third acid is employed, such as hydrochloric acid. A related repair method for replacing a worn or damaged chromide coating is described. The coating is often applied to portions of turbine engine components made from superalloy materials.

Process for removing chromide coatings from metal substrates, and related compositions

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Greenville, SC, United States of America

William Randall Thompson