U.S. 8,574,721 B2
United Technologies Corporation has been granted a patent for multilayer coating comprised of a bond coat layer; a first barrier layer applied on the bond coat layer, wherein the first barrier layer has a compositional gradient comprised of (a) a majority of a first rare earth stabilized zirconia material proximate the bond coat layer to (b) a majority of a second rare earth stabilized zirconia material away from the bond coat layer, wherein the first and second rare earth stabilized zirconia materials are different; a second barrier layer applied on the first barrier layer, wherein the second barrier layer has a compositional gradient comprised of (a) a majority of the second rare earth stabilized zirconia material and zero weight percent of a third rare earth stabilized zirconia material proximate the first barrier layer to (b) zero weight percent of the second rare earth stabilized zirconia material and 100 weight percent of the third rare earth stabilized zirconia material away from the first barrier layer.