Metal matrix composites of aluminum, magnesium and titanium usin

Details Metal matrix composites of aluminum, magnesium and titanium usin Metal matrix composites of aluminum, magnesium and titanium usin

1995-05-06

1996-11-12

Simmons, David A.

Metal treatment

Stock

Aluminum base

148420, 148421, 420402, 420417, 420528, 428546, C22C 2100

Patent

active

055736076

ABSTRACT:
A metal matrix composite of aluminum, magnesium or titanium, and their alloys, containing particles of a silicon boride composition. A preferred form of the boride is silicon hexaboride. A small amount of carbon can be present in the silicon boride composition as Si--B--C. The particles can be pre-blended with particles of the metal prior to melting, or can be added after the melting of the metal. Because of the similar specific gravity of silicon boron compounds and aluminum, very little stirring is required to achieve a homogeneous mixture in the melt. This substantially reduces formation of oxide and hydrogen inclusions. Improved machinability is achieved through utilization of rounded particles. The composite has improved strength, stiffness and reduced thermal coefficient of expansion, thus making the composite composition more useful in industry.

REFERENCES:
patent: 5196059 (1993-03-01), Niebylski

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