James O Wheeler

US Patent:

20050003172, Jan 6, 2005

Filed:

Jul 22, 2004

Appl. No.:

10/895886

Inventors:

James Wheeler - Greenville SC, US
Farshad Ghasripoor - Scotia NY, US
Chek Beng Ng - Albany NY, US
Raymond Chupp - Glenville NY, US
Donald Baldwin - Galway NY, US
Tara McGovern - Simpsonville SC, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B05D003/02
B32B003/00

US Classification:

428210000, 427446000, 427372200, 428195100, 428632000

Abstract:

A method of applying a profiled abradable coating onto a substrate in which an abradable ceramic coating composition is applied to a metal substrate using one or more coating application techniques to produce a defined ceramic pattern without requiring a separate web or grid to be brazed onto the substrate. The invention is particularly designed to withstand the higher operating temperatures encountered with the stage 1 section of 7FA+e gas turbines to allow for increased coating life without significant deterioration in structural or functional integrity. Typically, the grid pattern coating begins approximately 0.431″ after the leading edge of the shroud, and ends approximately 1.60″ before the trailing edge of the shroud. In the case of diamond-shaped patterns, the grid pattern will be about 0.28″ long and 0.28″ wide, with an overall thickness of about 0.46.″ The coatings thus provide the required levels of abradability and leakage performance and may be applied as a chevron or diamond pattern with the shape oriented such that the diagonals run perpendicular and parallel to the sides of the shroud.