Layered coating for erosion protection
AssigneeUnited Technologies Corporation
InventorsAaron T. Nardi, Jun Shi, Blair A. Smith
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Abstract
A coating for protecting a surface against erosion when contacted by particles having a range of particle sizes or by high velocity fluid impingement includes a first coating on the surface forming a high bulk or composite hardness coating; and a hard ceramic coating on the first coating having a hardness higher than the hardness of the first coating and the erosion particles.
Claims22
A coating for protecting a surface against erosion when contacted by particles having a range of particle sizes or by repetitive high velocity fluid impingement, comprising:
- a first coating sufficiently high in bulk composite hardness to resist deformation from particles or fluid impact pressure;
- and
- a second continuously hard coating on the first coating having a hardness higher than the first coating and the hardness of the particles.
A method for protecting a surface against erosion when contacted by particles having a range of particle sizes or by repetitive high velocity fluid impingement, comprising:
- applying a first sufficiently high in bulk or composite hardness to resist deformation from particles or fluid impact pressure;
- and
- applying a second continuously hard coating on the first coating having a hardness higher than the first coating and the hardness of the particles.
A component of an aircraft propulsion system, the component comprising:
- a substrate,
- a protective coating on the surface of the substrate, the protective coating comprising:
- a cermet coating on the substrate forming a high bulk or composite hardness coating, wherein the cermet is selected from the group consisting of tungsten-carbide-cobalt, tungsten-carbide-cobalt-chrome, chrome-carbide-nickel-chrome, and diamond-nickel;
- and
- a hard ceramic coating on the cermet coating having a higher and more continuous hardness than the cermet and a higher hardness than the erosive particles, wherein the ceramic coating is selected from the group consisting of titanium nitride, diamond, chrome nitride, diamond-like-carbon, cubic boron nitride, boron carbide, titanium carbide, or a combination of these.
Dependencies are inferred from the claim text.