Sm2Fe17系化合物のAr中でのMG及びNH3中でのMA効果

概要

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Mechanical grinding(MG) in Ar and mechanical alloying(MA) in NH3 have been applied to prepare Sm2Fe17Nx permanent magnet, where the three diffrent kinds of alloy powders, i.e., Sm2Fe17, Sm2Fe17C and Sm2Fe17C2 were used as the starting materials. Though Sm2Fe17 and Sm2Fe17C specimens obtained by MG or MA were recognized to consist of α-Fe and Sm-Fe amorphous phase, Sm2Fe17C2 specimen obtained by MG or MA process was confirmed to consist of only Sm-Fe amorphous phase. The fine grain particles under a single domain size( ?? 260nm) were obtained both by MG and MA, where the powder obtained by MA in NH3 was finer than that obtained by MG in Ar. Nitrogen content of the powder obtained by MA in NH3, increased as MA time passed. On the contrary, hydrogen content once increased at the first stage of MA, and after that decreased with the increase of MA time.