Preparation of Fine Powder of DyFe₂ Alloy by Hydriding

Abstract

The hydriding property of DyFe₂ alloy was examined with respect to the pressure-composition-temperature (P-C-T) relation and the pulverization behavior. The isotherm measured at 300 K suggests the formations of DyFe₂H₃ and/or DyFe₂H₄. The dissociation pressures of this hydride lie at 0.03 kg/cm² at 300 K. Block samples of DyFe₂ were found to be pulverized even after one hydriding-dehydriding reaction. The particle size of the DyFe₂ powder can be controlled by changing the number of the cyclic hydriding-dehydriding reaciton.