| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an iron nitride material, by which an iron nitride material having a high content of an α"Fe<SB POS="POST">16</SB>N<SB POS="POST">2</SB>phase can be obtained, and to provide such an iron nitride material. <P>SOLUTION: The manufacturing method includes a step of generating an α"Fe<SB POS="POST">16</SB>N<SB POS="POST">2</SB>phase by heating an Fe-containing base material such as pure iron, an iron alloy or an iron compound in a nitrogen element-containing gas atmosphere such as a nitrogen atmosphere, while applying a magnetic field to the base material. The applied magnetic field H is a strong magnetic field with H≥(7/3)+2×Nf, wherein Nf (Nf=0-1) is a demagnetization coefficient prescribed from the shape of the base material. Since the strong magnetic field with H≥(7/3)+2×Nf is applied to the base material, the primitive lattice of Fe elongates in the applied magnetic field direction (one direction) and the intrusion position of N is easily restricted to this one direction. Therefore, excess nitrogen is controlled, the α"Fe<SB POS="POST">16</SB>N<SB POS="POST">2</SB>phase excellent in magnetic properties is easily generated, and the objective iron nitride material having a high content of the α"Fe<SB POS="POST">16</SB>N<SB POS="POST">2</SB>phase can be manufactured. <P>COPYRIGHT: (C)2013,JPO&INPIT |
