Fabrication methods for metal matrix composites

Details Fabrication methods for metal matrix composites Fabrication methods for metal matrix composites

1996-07-01

1998-02-24

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 28, 419 29, 419 41, 419 54, 419 55, 164 47, 164 661, 164DIG6, 164DIG7, 29DIG31, B22F 312, C22C 105, C22C 103, C22C 2100

Patent

active

057220336

ABSTRACT:
A method of extruding a boron carbide-aluminum alloy metal matrix composite includes heating the ingots of the composite to temperatures of about 570.degree. C., holding the ingots at about 570.degree. C. to soften the ingots, placing the ingots in a heated extrusion chamber, and extruding the softened ingots at pressures about 15% to 20% higher than typical pressures used to extrude aluminum alloys. A method of casting a boron carbide-aluminum alloy metal matrix composite includes heating ingots of the composite to about 700.degree. C. to melt the ingots, gently stirring the melt, removing dross from the melt, vigorously stirring the melt with an impeller without creating a vortex, degassing the melt with an argon diffuser wand, and continuously removing froth formed during degassing until the rate of froth formation is reduced and the melt gently bubbles.

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"Powder Techniques in Processing of Metal Matrix Composites" by H.J. Rack in Metal Matrix Composites: Processing and Interfaces edited by R. K. Everett and R.J. Arsenault, Academic Press, 1991, pp. 83-101.

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