| 摘要 |
A device (10) comprising a substrate (22) having a deposited ceramic thermal barrier coating layer (20) characterized by a microstructure having gaps (28) where the thermal barrier coating (20) consists essentially of a pyrochlore crystal structure having a chemical formula consisting essentially of A<n+>2-xB<m+>2+xO7-y, where A is selected from the group of elements selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and mixtures thereof; where B is selected from the group of elements selected from Zr, Hf, Ti and mixtures thereof; n and m are the valence of A and B respectively, and for -0.5 </= x </= 0.5, y = formula (I), and 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. The preferred pyrochlore crystal structure is Sm2Zr2O7, which is stable over the range of operating temperatures of the device (10) up to at least above 1400 DEG C, and where the thermal barrier coating (30) can be deposited over a separate bottom fluorite thermal barrier coating. |
