| 摘要 |
PROBLEM TO BE SOLVED: To provide an R-Fe-B sintered magnet, which is more reduced in oxygen content and residual carbon content and more improved in magnetic characteristics than ones formed through a usual dry method, where the magnet is manufactured through a R-T-B sintered magnet manufacturing method, in which R-T-B sintered magnet material alloy powder subjected to a surface treatment is molded into a body, and the molded body is sintered and thermally treated for the formation of the R-Fe-B sintered magnet. SOLUTION: A R-T-B sintered magnet alloy coarse powder; which contains an R2T14B intermetallic compound (R denotes, at least one of rare earth elements containing Y, and T is Fe or Fe and Co) serving as the main phase and being in an amount of 99.5 to 99.99 pts.wt. and 0.01 to 0.5 pts.wt. ethylene carbonate and/or propylene carbonate are added and mixed together, the mixture is atomized into fine powder whose surface is covered with ethylene carbonate and/or propylene carbonate, the fine powder is molded into a body, and the body is sintered and thermally treated for the manufacture of the R-T-B sintered magnet. |
