Accession Number : ADD018030

Title :   Pressure Cast Alumina Tile Reinforced Aluminum Alloy Armor and Process for Producing the Same.

Descriptive Note : Patent, Filed 28 Sep 94, patented 23 Apr 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Divecha, Amarnath P ; Karmarkar, Subhash D ; Hoover, Scott M ; Kerr, James M ; Ferrando, William A

Report Date : 23 Apr 1996

Pagination or Media Count : 5

Abstract : A process for forming pressure cast alumina tile reinforced aluminum alloy armor in which a silver coated aluminum disc is first inserted into a mold assembly, the mold assembly includes a base plate, a hollow steel die with a removable steel liner located on the base plate, a plug disposed on the base plate within the die cavity, and a punch movably disposed within the die cavity, the aluminum disc being inserted within the die cavity over the plug. Next, an alumina tile preform is prepared by cutting a plurality of alumina tiles and weaving the tiles together with a stiff steel wire. The alumina tile preform is inserted over the silver coated aluminum disc in the cavity of mold assembly. The steel die, the plug and the disc are heated. The punch is also heated separately. A melt of molten aluminum is prepared and poured into the die cavity completely covering the alumina tile preform. The heated punch is immediately driven into the cavity to apply pressure to the molten aluminum. When the mold assembly cools, the punch is retracted, the base plate is removed, and the composite billet of pressure cast alumina tile reinforced aluminum alloy armor is removed from the mold.

Descriptors :   *ARMOR, *ALUMINUM ALLOYS, *ALUMINUM OXIDES, *TILES, *PATENTS, COMPOSITE MATERIALS, WIRE, STIFFNESS, FABRICATION, MELTS, CAVITIES, STEEL, DIES, BILLETS(MATERIALS), COATINGS, DISKS, ASSEMBLY, SILVER, WEAVING, MOLDS(FORMS)

Subject Categories : Armor
      Inorganic Chemistry
      Properties of Metals and Alloys
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE