| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method for r-t-b-based sintered magnet, preventing degradation of magnetic characteristics due to insufficient density during sintering and achieving excellent safety without causing an increase in manufacturing cost, in a two-alloy method, the manufacturing method being capable of improving HcJ without degrading Br using a texture with concentrated heavy rare earth element RH in an outer shell section of main phase crystal grain. SOLUTION : First alloy powder including R1 formed from light rare earth element RL or light rare earth element RL and heavy rare earth element RH, B and Fe and second alloy powder including R2 formed from RL and RH, B, Co, and Fe and having higher RH and Co content than the first alloy powder are blended, formed and sintered at a rate of 70 : 30-97 : 3. A difference between contents of R1 and R2 is not more than 1. COPYRIGHT : (C)2013, JPO&INPIT |
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