Method and apparatus for atomization and spraying of molten metals

• US 4,919,335 A
• Filed: 07/19/1988
• Issued: 04/24/1990
• Est. Priority Date: 07/19/1988
• Status: Expired due to Fees

• Current Assignee: Martin Marietta Energy Systems, Inc. (Martin Marietta Corporation)
• Original Assignee: United States Department of Energy (Government of the United States of America)
• Inventors: Sikka, Vinod K., Alexeff, Igor, Hobson, David O.
• Primary Examiner(s): Kashnikow, Andres
• Assistant Examiner(s): Weldon, Kevin P.
• Application Number:
  US07/221,393
• Time in Patent Office: 644 Days
• Field of Search: 264/16, 425/3, 425/6, 75/0.5 C, 239/135, 239/137, 239/3, 239/690, 239/708, 239/543, 239/545
• US Class Current: 239/3
• CPC Class Codes: B05B 5/00 Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
• CPC Class Codes: C23C 4/123 Spraying molten metal

Abstract

A method and device for dispersing molten metal into fine particulate spray, the method comprises applying an electric current through the molten metal and simultaneously applying a magnetic field to the molten metal in a plane perpendicular to the electric current, whereby the molten metal is caused to form into droplets at an angle perpendicular to both the electric current and the magnetic field. The device comprises a structure for providing a molten metal, appropriately arranged electrodes for applying an electric current through the molten metal, and a magnet for providing a magnetic field in a plane perpendicular to the electric current.

Claims

1. A method for producing a directed spray of fine particulate molten metal comprising:

providing spaced apart electrodes defining an open-ended zone therebetween for receiving molten metal feed;

providing a flow of molten metal feed into said zone in contact with said electrodes, thereby creating a flow path for electric current between said electrodes;

providing a magnetic field through said zone in a direction perpendicular to said flow path for electric current through said zone; and

passing an electric current through said electrodes and said molten metal in said zone to create magnethydrodynamic forces which accelerate said molten metal within said zone in a direction perpendicular to said flow path and said magnetic field thereby causing said molten metal feed to exit said zone and disperse into fine particulate droplets;

the directions of said magnetic field and electric current being selected to provide the desired direction of acceleration of said molten metal feed.

2. The method as set forth in claim 1 wherein the nozzle includes two, spaced apart, feed tubes for carrying molten metal feed therethrough to said zone and the electric current is passed through said tubes.

3. The method as set forth in claim 2 wherein the two feed tubes have open ends arranged to face each other with said open ended zone being defined by a spacing therebetween and said molten metal feed flows from said feed tubes into said spacing wherein the respective flows contact each other.

4. The method of claim 1 wherein the molten metal feed is provided by advancing solid metal wires into said zone while maintaining an electric arc between said wires to change the solid wires to a molten state.

5. An apparatus for producing a directed spray of fine particulate molten metal comprising;

spaced apart electrode defining an open-ended zone therebetween for receiving molten metal feed;

means for providing a flow of molten metal feed into said zone

means including said electrodes, for passing an electric current through said molten metal in said zone;

and means for providing a magnetic field through said zone in a direction perpendicular to the flow of electric current through said zone to create magnethydrodynamic forces which accelerate said molten metal feed within said zone in a direction perpendicular to the flow of electric current and said magnetic field, thereby causing said molten metal feed to exit said zone and disperse into fine particulate droplets, the directions of said magnetic field and electric current being selected to provide the desired direction of acceleration of said molten metal feed.

6. The apparatus of claim 5 wherein said nozzle includes two, spaced apart feed tubes for carrying molten metal feed therethrough to said zone, and wherein electric current is passed through said tubes.

7. The apparatus of claim 5 wherein the means for providing a flow of molten metal into said zone includes solid metal wires and means for advancing said solid metal wires into said zone while maintaining an electric arc between said wires to change the solid wires to a molten state.