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US 6,746,510 B2Granted
Processing of nanocrystalline metallic powders and coatings using the polyol process
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsLynn K. Kurihara, Ralph W. Bruce, Arne W. Fliflet, David Lewis
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Abstract
Nanostructured metallic powders and coatings are processed by suspending a metal precursor in a glycol solution containing the constituent metal salts and using a millimeter wave beam as the heating source. The mixture is then heated to reduce the metal precursor to a metal precipitate. The precipitated metal may then be isolated.
Claims15
A method of forming a nanocrystalline metallic powder, comprising the steps of:
- mixing a metal salt in a glycol solvent to form a reaction mixture;
- applying a millimeter-wave beam to said reaction mixture;
- refluxing said reaction mixture so that said glycol solvent reduces said metal salt to a metal, over a time selected to produce particles of said metal having a mean diameter size of about 100 nm or less.
A method of forming a nanocrystalline metallic powder, comprising the steps of:
- mixing a metal salt in an alcoholic solvent to form a reaction mixture, wherein the metal salt concentration is about 0.1 M;
- applying a millimeter-wave beam to said reaction mixture, wherein said millimeter-wave beam has a power of about 330 W;
- refluxing said reaction mixture so that said alcoholic solvent reduces said metal salt to a metal;
- and
- wherein said refluxing occurs for 15 minutes to produce particles of said metal having a mean diameter size of about 80 nm or less.
2 more elements
Dependencies are inferred from the claim text.