| 简介 |
PROBLEM TO BE SOLVED : To solve such a problem that a conventional magnet material has an insufficient mean grain-size of crystal grains, a low magnetic flux density (Br), and an insufficient maximum magnetic energy product (BH) max. SOLUTION : The objective magnet material is characterized by including a R (Y or rare earth elements, for example) -T (Fe or Co) -M (one or more among Nb, Zr, Ti, Cr, Ta, V, W, Mn, Ni, Mo, and Hf) -A (N or B) base, and an added Cu element for introducing a Cu-rich phase of 0.2-10 vol.% into the base, and by having the mean grain size of 150 nm or less. Hereby, a magnet material of ultra fine crystals capable of realizing high magnetic characteristics, can be provided. The method for manufacturing the material includes hydrogenation and decomposition reaction treatment which keeps pulverized particles at 450-850 deg.C for 1-8 hours in hydrogen gas inert gas (except for nitrogen gas), after a pulverization step, and dehydrogenation and recombination reaction treatment which keeps them at 600 deg.C-950 deg.C for 0.1-2 hours in vacuum. |
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