Metal matrix composites

Details Metal matrix composites Metal matrix composites

B - Operations, Transporting

22

D

148/24, 75/1.3

B22D 19/14 (2006.01) C22C 1/10 (2006.01) C22C 32/00 (2006.01) C22C 47/08 (2006.01) C22C 49/14 (2006.01)

Patent

CA 1321905

- 31 - ABSTRACT A ceramic-reinforced aluminum matrix composite is formed by contacting a molten aluminum-magnesium alloy with a permeable mass of ceramic material in the presence of a gas comprising from about 10 to 100% nitrogen, by volume. balance non-oxidizing gas, e.g., hydrogen or argon. Under these conditions, the molten alloy spontaneously infiltrates the ceramic mass under normal atmospheric pressures. A solid body of the alloy can be placed adjacent a permeable bedding of ceramic material, and brought to the molten state, preferably to at least about 700°C, in order to form the aluminum matrix composite by infiltration. In addition to magnesium, auxiliary alloying elements may be employed with aluminum. The resulting composite products may contain a discontinuous aluminum nitride phase in the aluminum matrix and/or an aluminum nitride external surface layer.

566790

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