Production of Sm₂Fe₁₇N₃ Magnets by Compression Shearing Method

Abstract

Sm₂Fe₁₇ nitrided powder was consolidated into bulk material at room temperature in an ambient atmosphere by the compression shearing method. The resultant bulk material retained the original Sm₂Fe₁₇N₃ phase structure without any appreciable decomposition of the Sm₂Fe₁₇N₃ phase. The bulk material had a density equivalent to 92.7% of the X-ray density of the Sm₂Fe₁₇N₃ phase. The bulk materials produced at 473 K in nitrogen atmosphere by the compression shearing method had virtually the same density as that produced at room temperature in an ambient atmosphere, but exhibited a maximum energy product of 65.7 kJm⁻³ with a coercivity of 892 kAm⁻¹.