Patent ID: 11958786
Assignee: UNITED STATES GOVERNMENT ADMINISTRATOR OF NASA
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  F | IPC C

Claim 0:
1. An apparatus, comprising:
a substrate, wherein the substrate is made of a material selected from the group consisting of a nickel-based superalloy, a ceramic oxide, a silicon-based material, and a silicon carbide composite;
a bond coat layer disposed on the substrate; and
a coating layer disposed on the bond coat layer, wherein the coating layer comprises:
a base oxide of hafnia, zirconia, or a combination thereof; and
a plurality of rare earth dopants, wherein the rare earth dopants comprise from 5 to 20 mol % of the coating layer, wherein the plurality of rare earth dopants comprise:
a primary stabilizer dopant;
a first cluster dopant oxide having a larger ionic size than the primary stabilizer dopant;
a second cluster dopant oxide having a smaller ionic size than the primary stabilizer dopant; and

a calcium oxide dopant, wherein the calcium oxide dopant comprises from 1 mol % to 10 mol % of the coating layer.