Fabrication of tile reinforced composite armor casting

• US 6,116,328 A
• Filed: 07/29/1999
• Issued: 09/12/2000
• Est. Priority Date: 07/29/1999
• Status: Expired due to Term

• Current Assignee: United States Secretary of the Navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Bulmash, Gerald, Kerr, James M., Ferrando, William A., Divecha, Amarnath P., Karmarkar, Subhash D., Bruchey, William J.
• Primary Examiner(s): Pyon, Harold
• Assistant Examiner(s): Lin, I.-H.
• Application Number:
  US09/362,883
• Time in Patent Office: 411 Days
• Field of Search: 164/100, 164/112, 164/114, 164/97, 164/98, 164/75, 164/111
• US Class Current: 164/100
• CPC Class Codes: B22D 13/00 Centrifugal casting; Casting by using centrifugal force
• CPC Class Codes: B22D 19/02 for making reinforced articles B22D19/14 takes precedence

Abstract

Alumina tiles within aluminum framing jigs are fixedly positioned by lock ns within an internally coated mold for centrifugal casting within a block of an aluminum alloy material. Such jigs and the tiles framed therein are coated with silver before casting to prevent aluminum oxidation by heating of the aluminum material to a molten state for deposit into the mold. Bonding of the tiles and framing of the jigs with the aluminum material being cast is also enhanced by such silver coating.

Claims

1. A method of fabricating a composite product made from metallic material reinforced by tiles embodied therein, involving the steps of:

positioning the tiles within a mold within which centrifugal casting of said metallic material about the tiles is performed to produce said product, the improvement residing in additional steps of;

assembling each of the tiles within metallic framing grooves prior to said positioning thereof within the mold; and

heating the metallic material to a molten state for deposit into the mold after said positioning therein of the tiles assembled within the metallic framing which is bonded to the metallic material by said casting thereof wherein said centrifugal casting is performed by rotation of the mold at 450 RPM with the metallic material in the molten state at a temperature of 1350-1400°

F.

2. The method as defined in claim 1, further including the step of:

coating the tiles and the metallic framing within the mold to prevent oxidation of the framing by transfer of heat thereto from the deposited material in the molten state and enhance bonding thereof to the tiles and the framing respectively.

3. The method as defined in claim 2, wherein said step of coating involves formation of a layer of silver on the tiles and the framing within the mold.

4. The method as defined in claim 3, further including the step of;

coating the mold with a release agent to enhance removal of the reinforced metallic material from the mold after said casting therein.

5. The method as defined in claim 4, wherein said release agent is aluminum oxide.

6. The method as defined in claim 1, further including the step of, coating the mold with a release agent to enhance removal of the reinforced metallic material from the mold after said casting therein.

7. The method as defined in claim 6, wherein said release agent is aluminum oxide.