Sm2Fe17 ALLOY WITH Ta ADDITION AND THE PREPARATION PROCEDURE

摘要

The process is provided for producing the Sm2Fe17 alloy with Ta addition, without expensive high temperature-long term annealing. As-cast alloy is suitable as the basic material for the preparation of permanent magnets based on nitrides of intermetallic compounds of rare earth and transition metals. The process is described for the as-cast alloy preparation with two phases present, Sm2Fe17 suitable for the nitrogenation to the hard magnetic Sm2Fe17N3-x phase and paramagnetic TaFe2 hexagonal phase. The phase modification is attained with the addition of a third alloying element. Ta substitutes Fe in the Sm2Fe17 nominal composition. The amount of iron or other ferromagnetic phases is lower than 0.5 wt.%. The invention relates to the preparation of the cast alloy with a minimum amount of free iron and/or other soft magnetic phases, which is suitable for further nitrogenation without high temperature long term annealing. The as-cast alloy is suitable for the preparation of the Sm2Fe17-xTaxN3-y compound.