| 摘要 |
PROBLEM TO BE SOLVED: To improve corrosion resistance, orienting property, magnetic characteristics and the squareness of a demagnetization curve by specifying a compsn. and regulating the grain diameter distribution and average grain diameter of tetragonal R2 TM14 (B1- XCX) as a principal phase and the grain diameter distribution of an R-C compd. phase. SOLUTION: This magnet material has a compsn. consisting of, by atom, 12-18% R, 2-6% B, <=4% C (4%<=B+C<=8%), <=3% O2 and the balance Fe, and Co and/or Ni may be substd. for a part of the Fe. It has a structure consisting of >=85% tetragonal R2 (Fe1- YTMY)14 (B1- XCX) as a principal phase, 0.5-10% grain boundary phase and <=3% R-C compd. phase, the grain diameter distribution of the principal phase is 0.05-30μm and the average grain diameter is 2.0-10μm. The grain diameter distribution of the R-C compd. phase is <=10μm. |
