<報文>マグネシウム及びリチウム熱還元法によるニッケルーミッシュメタル合金の直接製造に関する研究

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Aiming at the development of a less energy-consumptive process for producing hydrogen storage materials, an experimental study was carried out on the direct production of Ni-Rm (Rm : mixture of La, Ce, Pr, Nd) alloys from the mischmetal oxide by the reduction-diffusion (R-D) method. In the R-D process, a mischmetal oxide was reduced by metallic magnesium or lithium at temperatures of 1273,1323 and 1373 K in the presence of nickel particles (size : -100,+200 mesh) and the reduced mischmetal elements directly formed Ni-Rm alloys. An optical microscopic observation and an EPMA analysis of the reacted nickel particles after the magnesiothermic reduction revealed that some Ni-Rm-Mg ternary alloy phases and Ni_2Mg were formed from outside to inside the particles, and that the Ni_2Mg layer was always sandwiched between a Ni-Rm-Mg ternary alloy layer and the unreacted nickel core. These observations suggest that a reaction of the diffused mischmetal elements with Ni_2Mg to form the Ni-Rm-Mg ternary alloy occurred. Volume fractions of the unreacted nickel core were found to decrease with the reaction time, and the core disappeared in 120,60 and 45 minutes at 1273,1323 and 1373 K, respectively. A Ni-Rm binary alloy with an atomic ratio, Rm/Ni, of less than 1/5 was obtained by the lithiothermic reduction, which was formed in a bulk phase (liquid lithium) by a reaction of nickel dissolved in the bulk with the mischmetal elements.reduction diffusion methoddirect alloy productionnickel-mischmetal alloyhydrogen storage materialmagnesiothermic reductionlithiothermic reductionmischmetal oxide
1993-03-30

<報文>マグネシウム及びリチウム熱還元法によるニッケルーミッシュメタル合金の直接製造に関する研究

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