Rare Earth Sintered Magnet and Making Method

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A strip cast alloy containing neodymium, exceeding the stoichiometry of Nd2Fe14B, is conducted with a hydrogenation disproportionation desorption and recombination (HDDR) treatment and dispersion treatment, in order to obtain microcrystal alloy powder, wherein primary crystal grain having sizes of 0.1-1μm is surrounded by neodymium-rich crystal grain boundary phase having widths of 2-10nm. The powder is finely pulverized, compressed, and sintered, so as to obtain a sintered magnet having a high coercive force.[Reference numerals] (AA) Manufacturing microcrystal alloy powder; (BB) Strip casting; (CC) HDDR process; (DD) Diffusion process; (EE) Pulverizing; (FF) Compressing; (GG) SinteringCOPYRIGHT KIPO 2014