| 摘要 |
A method for producing single-phase intermetallic phases, which melt incongruently within a temperature range of 900 DEG to 2,000 DEG 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 DEG 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 mu m. 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 DEG K., but is less than the melting temperature Tm, during a period sufficient for the diffusion of the components.
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