| 简介 |
PROBLEM TO BE SOLVED : To provide a rare earth sintered magnet of high residual magnetic flux density (Br) without degrading coercive force (HcJ) and mechanical strength.
SOLUTION : The rare earth sintered magnet consists of a sintered body whose carbon content is 500-1, 500 ppm with cv value of carbon content on a fracture surface of 200 or less. The cv value of carbon content is preferably 150 or less. The rare earth sintered magnet is preferably an R-Fe-B sintered magnet containing R2Fe14B compound (R is one or more kinds among Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu). The R-Fe-B sintered magnet like this has such characteristics as flexural strength is 350 MPa or higher, residual magnetic flux density (Br) is 13 kG or higher, and coercive force (HcJ) is 18 kOe or higher.
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