US 6,982,126 B2 | ||
Thermal barrier coating | ||
Ramgopal Darolia, West Chester, Ohio (US); Irene Spitsberg, Loveland, Ohio (US); Brett Allen Rohrer Boutwell, Liberty Township, Ohio (US); Mark Daniel Gorman, West Chester, Ohio (US); Curtis Alan Johnson, Niskayuna, N.Y. (US); and Venkat Subramaniam Venkataramani, Clifton Park, N.Y. (US) | ||
Assigned to General Electric Company, Schenectady, N.Y. (US) | ||
Filed on Nov. 26, 2003, as Appl. No. 10/707,197. | ||
Prior Publication US 2005/0112412 A1, May 26, 2005 | ||
Int. Cl. B32B 9/00 (2006.01); F03B 3/12 (2006.01) |
U.S. Cl. 428—701 | 26 Claims |
1. A thermal barrier coating on a surface of a component, the thermal barrier coating having an interior region formed of a ceramic material so as to have a lower thermal conductivity than zirconia partially stabilized by about seven weight percent yttria, and an outer surface region on and contacting the interior region and formed of a ceramic material, the thermal barrier coating having a columnar microstructure whereby the interior region and the outer surface region comprise columnar grains of their ceramic materials, the grains of the interior region and the outer surface region being oriented substantially normal to the surface of the component, at least a portion of the columnar microstructure comprising feathery grains, the grains of the outer surface region being denser, more columnar, and more closely spaced than the grains of the interior region, the outer surface region being more erosion and impact resistant than the interior region at least in part as a result of the grains thereof being more closely spaced than the grains of the interior region. |