C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 1/06 (2006.01) B22F 9/20 (2006.01) C22B 5/04 (2006.01) H01F 1/057 (2006.01) H01F 1/059 (2006.01)
Patent
CA 2081032
Abstract of the Disclosure A method for producing single-phase intermetallic phases, which melt incongruently within a temperature range of 900° to 2,000°K, with a homogeneity range of ? 10 atom% at room temperature by co-reduction is described. The exothermic reaction of the calciothermal reduction is adjusted by altering the oxide content of the reaction mixture, the composition of which corresponds to the desired single-phase alloy, in such a way that the temperature condition Tm > TR ? 0.9 Tm (in °K) is fulfilled, Tm being the melting temperature of the intermetallic phase and TR the reaction temperature. The components of the reaction mixture, with the exception of calcium, have an average particle size of ? 75 µm. The reaction product at the end of the exothermic reaction is tempered at a temperature which is at least 0.7 times the melting temperature Tm of the desired, single-phase alloy, measured in °K, but is less than the meltingtemperature Tm, during a period sufficient for the diffusion of the components.
Edeling Martin
Eggert Horst
Steinhorst Michael
Lcm Less Common Metals Ltd.
Marks & Clerk
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