| 简介 |
PROBLEM TO BE SOLVED : To provide a permanent magnet in which both high corrosion resistance and magnetic characteristics are achieved as compared with a conventional R-T-B based sintered magnet.
SOLUTION : Disclosed is an R-T-B based sintered magnet (where, R requires Y (yttrium) and R1 as essential, R1 is at least one kind of rare earth metal element excluding Y requiring Nd as essential, and T is one kind or more of transition metal elements requiring Fe or Fe and Co). Y is segregated at a triple point by converting R1 : Y ratio in R from 80 : 20 to 35 : 65 in a molar ratio of a sintered-body composition, and corrosion of a grain boundary phase is prevented by its oxidization.
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