| 简介 |
PROBLEM TO BE SOLVED : To enable acquisition of a high coercivity and possession of a wide sintering temperature width by providing a fine crystalline structure, even when the quantity of oxygen in a sintered body is low.
SOLUTION : An R-T-B based sintered magnet is a sintered body which comprises main phase crystalline grains made of an R2T14B phase (R denoting one, two, or more types of elements selected from among rare earth elements, T denoting one, two, or more types of elements selected from among transition metal elements including Fe, Fe and Co), and a grain boundary phase, including more Rs than the main phase crystalline grains. The sintered body includes an Nb-Fe compound in the main-phase crystalline grains. The R-T-B based sintered magnet can be obtained by a mixing method of including Nb in an alloy for main phase formation.
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