| 摘要 |
PROBLEM TO BE SOLVED: To provide a high performance R-T-B-C based sintered magnet (wherein R is at least one rare earth element; and T is Fe, or Fe and Co), and a production method therefor. SOLUTION: An R-T-B-C based alloy having the main componential composition of, by weight, 28 to 33% R (wherein R is at least one rare earth element) and 0.9 to 1.1% B+C (wherein the content of B is 0.6 to 0.9%, and the content of C is 0.15 to 0.3) and the balance T (wherein T is Fe, or Fe and Co) and having a main phase consisting of an R2 T14 (B, C) phase is pulverized. The obtained fine powder is recovered into a nonoxidizing solution consisting of oil such as mineral oil and at least one kind of lubricant selected from the monovalent alcohol ester of a polybasic acid, the fatty acid ester of polyhydric alcohol, and their derivatives, and is then subjected to forming, degreasing, sintering, and heat treatment. |
