Patent ID: 6387539
Filing Date: 2002-05-14
Classification: C04B,C23C,Y02T,Y10T

Abstract:
A device operating over a range of temperatures and having a deposited thermal barrier coating on at least a portion of its surface, the device comprising:a substrate with a base coat; a first ceramic thermal barrier layer; and a second ceramic thermal barrier layer comprising a An+2âˆ’xBm+2+xO7âˆ’y chemical formula, where A is selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and mixtures thereof, where B is selected from the group consisting of Zr, Hf, Ti and mixtures thereof, where n and m are the valence of A and B respectively, and where for âˆ’0.5&lE;x&lE;0.5, y=7-[(2-x)&it;n+(2+x)&it;m]2,â€ƒand excluding the following combinations for x=0, y=0: A=La and B=Zr, A=La and B=Hf, A=Gd and B=Hf, and A=Yb and B=Ti.