| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an R-Fe-N magnetic powder, particularly an anisotropic Sm-Fe-N magnetic powder, which requires no crushing treatment, contains little impurities, shows no crushing strain, and has a high coercive force. <P>SOLUTION: The production method of the highly pure R-Fe-N magnetic powder comprises a step wherein an R-Fe alloy powder is melted in plasma emitted into a reactive gas containing nitrogen, a step wherein the R-Fe alloy powder melt is reacted with nitrogen to obtain an R-Fe-N alloy melt, and a step wherein the R-Fe-N alloy melt is rapidly cooled to yield the objective magnetic powder with an average particle size of 0.5-10 μm. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
