Wasserstoffabsorbierndes Legierungspulver und Verfahren zur Herstellung desselben sowie alkalische Speicherbatterie

摘要

Provided is an alloy powder having a narrow particle size distribution centering about a desired particle diameter and containing small amounts of finer and coarser particles, whereby the variation in characteristics resulting from differences in alloy particle size is eliminated and, moreover, the problems arising from cracking and particle size reduction induced in the alloy by the absorption and release of hydrogen are solved. More specifically, provided is an AB5 type hydrogen absorbing alloy powder obtained by quenching a melt of a hydrogen absorbing alloy rapidly and subjecting the resulting hydrogen absorbing alloy to fracturing by absorbing hydrogen, wherein the particle size distribution of the hydrogen absorbing alloy powder is such that, when the frequencies of detection of various particle diameters are cumulatively added from smaller-diameter to larger-diameter particles, and the particle diameters corresponding to 10%, 50% and 90% of all particles are represented by D10, D50 and D90, respectively, the values of D10, D50 and D90 fall within the respective ranges defined by 4 mu m