Process for preparation of composite materials containing nonmetallic particles in a metallic matrix, and composite materials made thereby
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United States of America Patent
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Nov 22, 1988
Issued Date -
N/A
app pub date -
May 1, 1986
filing date -
Jun 6, 1983
priority date (Note) -
Expired
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Abstract
A method and apparatus for preparing cast composite materials of nonmetallic particles in a metallic matrix, wherein particles are mixed into a molten metallic alloy to wet the molten metal to the particles, and the particles and metal are sheared past each other to promote wetting of the particles by the metal. The mixing occurs while minimizing the introduction of gas into the mixture, and while minimizing the retention of gas at the particle-liquid interface. Mixing is done at a maximum temperature whereat the particles do not substantially chemically degrade in the molten metal during the time required for processing, and casting is done at a temperature sufficiently high that there is no solid metal present in the melt. Mixing is preferably accomplished with a dispersing impeller, or a dispersing impeller used with a sweeping impeller.
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