Oxide layer compositions for turbine engine components

A method for coating a superalloy substrate of a turbine engine component, comprising:

• forming a bond coat over the superalloy substrate;
• depositing an oxide layer over the bond coat using at least one of chemical vapor deposition (CVD), physical vapor deposition (PVD), atomic layer deposition (ALD), or combinations thereof, wherein the oxide layer comprises:
• aluminum oxide;
• and
• a metal dopant;
• and
• forming a thermal barrier coating over the oxide layer.

A turbine engine component, comprising:

• a superalloy substrate including at least one of a nickel-based superalloy, a cobalt-based superalloy, an iron-based superalloy, or a combination thereof;
• a bond coat contacting the superalloy substrate, the bond coat including at least one metal having the formula MCrAl(X), wherein M is selected from the group consisting of Ni and Co, and wherein X is selected from the group consisting of Hf, W, Zr, Y, and La;
• an oxide layer contacting the bond coat, wherein the oxide layer comprises:
• aluminum oxide, wherein the oxide layer includes about 95 wt % or greater of the aluminum oxide, based on total weight of the oxide layer;
• and
• a metal dopant, wherein the metal dopant is selected from the group consisting of Hf, Y, La, Ce, Cr, Nd, Dy, Yb, Sr, Ba, Lu, Ho, Gd, Er, Ti, Nb, Sm, Tb, and Tm;
• and
• a thermal barrier coating contacting the oxide layer.