Patent ID: 11952317
Assignee: ROLLS-ROYCE CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  F | IPC C  F

Claim 10:
11. An article comprising:
a substrate of a gas turbine engine component; and
a barrier coating on the substrate, the barrier coating comprising:
a matrix comprising a rare-earth disilicate, the matrix extending from an inner interface facing the substrate to an outer surface opposite the inner interface, the matrix further comprising:
a first layer adjacent the inner interface comprising about 10% by volume ytterbium monosilicate and about 90% by volume ytterbium disilicate, and wherein the first layer further comprises a porosity of 1.81%; and
a second layer adjacent the outer surface comprising about 50% by volume ytterbium monosilicate and about 50% by volume ytterbium disilicate, and wherein the first layer further comprises a porosity of 3.97%; and
wherein the barrier coating defines a coating thickness along a direction from the outer surface to the inner interface, wherein the second layer defines a first thickness along the direction, wherein the first layer defines a second thickness along the direction, and wherein a ratio of the first thickness to the coating thickness is greater than 0.1, and wherein a ratio of the second thickness to the coating thickness is greater than 0.1.