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US 6,274,257 B1Granted
Forming members for shaping a reactive metal and methods for their fabrication
AssigneeIonBond Inc.
InventorsRobert R. Aharonov, Sridhar Chellapilla, Raymond P. Fontana, Bernard J. Janoss
Life of this patent
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Abstract
Coatings of doped chromium nitride protect forming members such as dies from the corrosive effects of molten aluminum and other reactive metals.
Claims26
A forming member for shaping a reactive metal, said forming member comprising:
- a substrate having a forming surface defined thereupon;
- and
- a protective coating disposed on at least a portion of said forming surface, said protective coating comprising a doped chromium nitride.
A method for forming a reactive metal, said method comprising:
- providing a forming member, said forming member comprising a substrate having a forming surface defined thereupon, and a protective coating of a doped chromium nitride disposed upon at least a portion of said forming surface;
- and
- maintaining a reactive metal in contact with said forming surface for a period of time sufficient to form said reactive metal.
A protective coating which is resistant to molten, reactive metals, said coating consisting essentially of:
- a matrix of CrN;
- and
- a dopant dispersed in said matrix, said dopant selected from the group consisting of:
- transition metals, oxygen, and combinations thereof.
1 more element
A method for forming a protective coating on a forming member used for shaping a reactive metal, said method comprising:
- depositing a coating of doped chromium nitride onto at least a portion of said forming member by a physical vapor deposition process.
Dependencies are inferred from the claim text.