Laser Treatment of Piston Seal Rings
AssigneeRtx Corporation
InventorsHamidreza Mohseni, David U. Furrer, Henry H. Thayer
Life of this patent
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Abstract
A seal ring has a substrate having: an inner diameter surface; an outer diameter surface; a first zone representing a by-weight majority of the substrate and having Co as a largest by-weight constituent element and at least 18.0 weight percent Cr; and a second zone, radially outward of the first zone, and having Cr2O3 and Cr2CoO4.
Claims30
A seal ring comprising a substrate (20) having:
- an inner diameter surface (28);
- an outer diameter surface (30);
- a first zone (200) representing a by-weight majority of the substrate and having Co as a largest by-weight constituent element and at least 18.0 weight percent Cr;
- and
- a second zone (202), radially outward of the first zone, and having Cr2O3 and Cr2CoO4.
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A method for coating a seal ring, the method comprising:
- laser cleaning a cobalt-based ring substrate;
- and
- laser treating an outer diameter surface of the cleaned substrate to form an oxide-containing layer (202).
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A method for manufacturing a seal ring (20), the method comprising:
- cleaning a substrate;
- and
- laser-treating an outer diameter surface of the to form an oxide-containing layer (202) comprising Cr2O3 and Cr2CoO4.
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Dependencies are inferred from the claim text.