USA As Represented by Secretary of the Navy

Scott M Hoover

William A Ferrando

Subhash D Karmarkar

Amarnath P Divecha

James M Kerr

David J Goldstein

William A May

Amarnath P Diyecha

A predetermined quantity of a metal-matrix composite material is injected to a heating crucible along an angular infeed direction toward a location therein at which a vortex is formed by the blade of an agitator through which the material is stirred while being superheated above the melting temperature to a pouring temperature under which the melted material is transferred to a casting mold after surface skimming thereof to form a product having improved wear resistance properties.

Fabrication of metal-matrix compositions

A process for forming pressure cast alumina tile reinforced aluminum alloy rmor 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.

Pressure cast alumina tile reinforced aluminum alloy armor and process

The article is produced by prepositioning nonwoven reinforcement made of a etallic mesh to which ceramic tiles are wired inside of a centrifugal casting mold. Molten matrix metal is then introduced into the mold while being rotated about an axis parallel to the inflow path of the molten metal until it completely encapsulates the reinforcement.

Method of centrifugally casting reinforced composite articles

A reinforcement made of a composite material is positioned inside of a ceifugal casting mold. Molten matrix metal is then introduced into the mold while being rotated about its longitudinal axis until the molten metal completely encapsulates the reinforcement.

Centrifugal casting of reinforced articles

A thin layer of silver metal is formed between a molybdenum surface and a eel surface. The silver metal layer is diffusion bonded to the molybdenum surface and diffusion bonded to the steel surface, thus bonding the molybdenum and steel surfaces together.

Method of bonding molybdenum to steel

A composite reinforced gun barrel with a composite of a titanium, nickel, FeCrAlY alloy matrix reinforced with round filaments or rectangular ribbons made of molybdenum or tungsten. The composite layer may be bonded directly onto the barrel or it may be bonded to a steel jacket which can then be heat shrunk onto an existing gun barrel.

Composite reinforced gun barrels

Process for the production of ingots of castable discontinuous metal matrix omposites by encapsulating particulate refractory material of the B.sub.4 C or SiC in a matrix metal of Li or al to form a solid master alloy, and introducing the master alloy into molten Mg or an alloy thereof, mixing and then cooling to solidify the resultant mixture and form an ingot with the refractory material substantially dispersed in the ingot.

Techniques for preparation of ingot metallurgical discontinuous

A non-magnetic, wear resistant composite of from 10 to 45 volume percent of titanium carbide or tungsten carbide particles bonded in a matrix of a nickel-titanium alloy wherein nickel comprises from 53 to 62 weight percent of the alloy with the remainder being essentially titanium.

Method of bonding metal carbides in non-magnetic alloy matrix

A method of producing homogeneous nickel-titanium base shape change memory lloys which includes the following steps in order:

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Burtonsville, MD, United States of America

Scott M Hoover