Aluminum-base metal matrix composite

Details Aluminum-base metal matrix composite Aluminum-base metal matrix composite

C - Chemistry, Metallurgy

22

C

C22C 21/00 (2006.01) C22C 1/10 (2006.01) C22C 32/00 (2006.01) C22C 49/14 (2006.01)

Patent

CA 2094369

The invention provides an aluminum-base composite material. The aluminum-base material contains a uniform distribution of carbide particles and lubricating phase particles such as carbon or graphite. The carbide particles increase hardness for improved wear resistance. The lubricating phase particles provide improved wear resistance and especially improve unlubricated wear resistance under increased loads. Finally, a dispersoid of nickel aluminide intermetallic phase may also be used to provide additional hardness and wear resistance. The composite is formed by introducing carbide particles and lubricating phase such as graphite into a molten aluminum alloy to neutralize buoyancy and to form an aluminum-base mixture. Mixing the aluminum-base mixture to uniformly distribute carbide and carbon particles throughout the molten aluminum. Carbide and carbon particles counteract each other to remain uniformly distributed throughout the aluminum-base alloy despite prolonged holding or cooling times.

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