| abstract |
The present invention provides coating systems for forming on the surface of a substrate, as well as the resulting coated parts and methods of forming the coatings. The coating system may comprise a layer of a compound having the formula: A 1-b B b Z 1-d D d MO 6 , where: A is Al, Ga, In, Sc, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Fe, Cr, Co, Mn, Bi or mixtures thereof; b is 0 to about 0.5; Z is Hf, Ti or mixtures thereof; D is Zr, Ce, Ge, Si, or a mixture thereof; d is 0 to about 0.5; and M is Ta, Nb, or a mixture thereof. |