<報文>溶融還元によるニオブ-チタン合金の直接製造

概要

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Carbon-reduction smelting of a mixture of Nb_2O_5 and TiO_2 at nearly 2800K under 0.1 MPa has been examined to investigate the feasibility of direct preparation of Nb-Ti alloys (Ti=45-50 mass%). A laboratory-scale plasma reactor and a 10%H_2-Ar plasma arc as heating source were used. The sum of oxygen and carbon contents in the alloy products obtained after 60min of reduction for the charge with 0.98 to 1.02 of C/O mole ratio was reduced to less than 2 mass%, but it was difficult to get lower than that value. The loss of Ti by evaporation of Ti-oxycarbide (Ti-O-C) was found to be significant during reduction but Nb-loss was scarcely observed. Therefore, the composition of Ti in the products decreased to nearly 40 mass%. These results indicate that deoxidation and decarburization from the Nb-Ti-O-C melt proceeded by evaporation of Ti-oxycarbide besides CO-degassing. The products were composed of two phases which were an Nb-Ti alloy phase containing a small amount of oxygen and carbon and a Ti-C-O precipitate phase containing Nb. Superconducting transition temperatures of these products were 9 to 10K.niobium-titanium alloydirect productioncarbon-reduction smeltingplasma metallurgysuperconductordeoxidationdecarburization
東北大学の論文
1991-03-29