| 摘要 |
PROBLEM TO BE SOLVED: To provide a bulked replacement spring magnet and its manufacturing method, and a motor, a sensor or the like with the replacement spring magnet without damaging magnet characteristics. SOLUTION: The bulked replacement spring magnet has a structure, wherein raw powder is made dense, and boron atom and oxygen atom cohere among grains of the dense raw powder, and comprises a permanent magnet phase and a soft magnetic phase. Magnet material composition formula is NdxFe100-x-yBy wherein x=4 to 11, y=3 to 8 or x=7.5 to 10.5, y=5.5 to 7.5. The ratio of concentration of boron atom among dense raw powder grains to concentration of boron atom inside raw powder grain (intergranular concentration/intragranular concentration) is at least 1.2. The ratio of concentration of oxygen atom among the dense raw powder grains to concentration of oxygen atom inside raw powder grain (intergranular concentration/ intragranular concentration) is at least 1.2. |
