| 简介 |
PROBLEM TO BE SOLVED : To feed rare earth-iron-nitrogen series alloy powder stably high in magnetic properties and small in the variation of the quality. SOLUTION : In the method for producing rare earth-iron-nitrogen series alloy powder having a stage in which a raw material mixture obtained by mixing a rare earth raw material, an iron raw material and granular metallic Ca is subjected to reduction diffusion and is successively subjected to nitriding, the raw material mixture is a dried product obtained, at the time of charging the raw material mixture into a hermetically sealed heating vessel and evacuating the vessel in a heating state of 700 deg.C, by performing the evacuation till the internal pressure of the vessel reaches 0.05 Torr or less. |
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