Dilution control in hardfacing severe service components
AssigneeKennametal Inc.
InventorsMatthew Yao, Rachel Collier, Danie DeWet
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Abstract
Forming a wear- and corrosion-resistant coating on an industrial component such as a chemical processing or nuclear power valve component by applying a cobalt-based dilution buffer layer to an iron-based substrate by slurry coating, and then applying by welding a cobalt-based build-up layer over the cobalt-based dilution buffer layer. An industrial component having a dilution buffer layer and a welding build-up layer thereover.
Claims25
A method for forming a wear- and corrosion-resistant coating on an industrial component comprising:
- a) applying a cobalt-based dilution buffer layer having a thickness between about 0.005 and about 0.03 inch directly onto an iron-based substrate by slurry coating of a cobalt-based alloy powder followed by sintering to fuse the powder together and to the substrate, wherein the cobalt-based dilution buffer layer is a cobalt-based alloy;
- b) applying by welding a cobalt-based build-up layer over the cobalt-based dilution buffer layer to integrate the build-up layer and the dilution buffer layer into an integral cobalt-based wear- and corrosion-resistant layer, wherein the cobalt-based build-up layer is a cobalt-based alloy and is an outer surface layer;
- and
- c) cooling the component to room temperature.
A method for forming a wear- and corrosion-resistant coating on an industrial valve component comprising:
- a) applying a cobalt-based dilution buffer layer having a thickness between about 0.005 and about 0.03 inch directly onto to an iron-based valve component body substrate selected from the group consisting of a valve body, a ball of a ball-and-ring valve assembly, a seat of a ball-and-ring valve assembly, a gate valve component body, a V-ball valve component body, a wedge valve component body, wedge valve guides, and a valve seat body, said applying comprising slurry coating of a cobalt-based alloy powder followed by sintering to fuse the powder together and to the substrate, wherein the cobalt-based dilution buffer layer is a cobalt-based alloy;
- b) applying by welding a cobalt-based build-up layer over the cobalt-based dilution buffer layer to integrate the build-up layer and the dilution buffer layer into an integral cobalt-based wear- and corrosion-resistant layer, wherein the cobalt-based build-up layer is a cobalt-based alloy and is an outer surface layer;
- and
- c) cooling the component to room temperature.
Dependencies are inferred from the claim text.