Fabrication of Zn/Sm2Fe17N3 Sintered Magnets by High-Pressure Current Sintering

概要

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Anisotropic Zn/Sm2Fe17N3 sintered magnets were successfully fabricated by a high-pressure current sintering as a low-thermal-load sintering technique. Zn/Sm2Fe17N3 powder mixtures, prepared by ball milling and annealing at 450°C, exhibited the high coercivity (Hcj) equivalent to the raw magnet powder. The bulk magnets sintered from the annealed mixtures maintained the high Hcj. Subsequently, unannealed mixtures were directly sintered to perform the annealing and sintering concurrently. This concurrent treatment increased in the sintered density, resulting in improvement of the remanence (Br). For further improvement of Br the Zn additive amount must be reduced, and TEM-EDX analysis for the annealed mixtures implied that the decreases in oxygen contamination enable to reduce the Zn amount.