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US 9,689,069 B2Granted
Coating system including diffusion barrier layer including iridium and oxide layer
AssigneeROLLS-ROYCE plc
InventorsSungbo Shim, Ann Bolcavage, Randolph C. Helmink
Life of this patent
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Abstract
In some examples, an article may include a superalloy substrate and a coating on the superalloy substrate. In accordance with this example, the coating includes a diffusion barrier layer on the substrate and a wear resistant oxide layer over the diffusion barrier layer. The diffusion barrier layer may include iridium and the wear resistant oxide layer may include at least one of silica, zirconia, or chromia.
Claims17
An article comprising:
- a gas turbine engine disk comprising:
- a superalloy substrate that defines at least one fir tree recess;
- and
- a coating on the superalloy substrate, wherein the coating is on a surface of the at least one fir tree recess and not on a surface of the gas turbine engine disk other than the surface of the at least one fir tree recess, and wherein the coating comprises:
- a diffusion barrier layer on the superalloy substrate, wherein the diffusion barrier layer comprises iridium, and
- a wear resistant oxide layer over the diffusion barrier layer, wherein the wear resistant oxide layer comprises silica.
3 more elements
A method comprising:
- selectively depositing a diffusion barrier layer on surfaces of at least one fir tree recess of a gas turbine engine disk comprising a superalloy substrate, wherein the diffusion barrier layer comprises Ir, and wherein the diffusion barrier layer is not deposited on surfaces of the gas turbine disk other than the surfaces of the at least one fir tree recess;
- and
- depositing a wear resistant oxide layer over the diffusion barrier layer, wherein the wear resistant oxide layer comprises silica.
Dependencies are inferred from the claim text.