Patent ID: 6306517
Filing Date: 2001-10-23
Classification: C23C

Abstract:
A thermal barrier coating that is adapted to be deposited on a substrate surface, the thermal barrier coating comprising:a plurality of ceramic layers, the plurality of ceramic layers being disposed adjacent to one another, each ceramic layer of the thermal barrier coating having a thickness and a microstructure, the microstructure comprising a plurality of ceramic particles bonded to each other, the ceramic particles forming directionally solidified continous columnar grains being oriented generally parallel with each other and perpendicular to the surface, the continous columnar grains extending through the thickness of each ceramic layer, at least some of the ceramic layers that comprise the directionallt solidified continous columnar grains extend from one ceramic layer into an adjacent ceramic layer and the at least some of the ceramic layers being coherent with directionally solidified continous columnar grains within the adjacent ceramic layer, and forming a coherent columnar microstructure in the thermal barrier coating during deposition;wherein the deposition surface temperature is in the range from about .2 to about 0.5 of the absolute melting temperature of the ceramic material used to form the thermal barrier coating.