C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 1/10 (2006.01) B22D 1/00 (2006.01) C22C 21/00 (2006.01) C22C 32/00 (2006.01)
Patent
CA 2084755
A metal matrix composite material containing discontinuous particles in a metallic matrix is prepared by forming a mix- ture of the molten alloy and the particles in a closed reactor, removing oxygen from the interior of the reactor, statically pressuriz- ing the interior of the reactor with nitrogen gas, mixing the mixture of the molten alloy and particles in the presence of the static nitrogen gas to wet the molten matrix to the particles, and evacuating the interior of the reactor in a stepwise manner. The nitrog- en gas aids in wetting the metallic alloy to the particles by forming aluminum nitride at the particle-molten matrix interface, so that a lower contact angle of the alloy to the particle results. Oxygen that may be present in the sealed reactor is gettered by the aluminum, and the nitrogen is removed by stepwise evacuation, thereby minimizing the introduction of gas into, and retention of gas within, the melt.
Jin Iljoon
Lloyd David James
Mcleod Alan David
Morris Phil L.
Alcan International Limited
Kirby Eades Gale Baker
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