| 简介 |
PROBLEM TO BE SOLVED : To provide a method that can efficiently produce a rare earth-transition metal-nitrogen system alloy powder that has excellent magnetic properties as a permanent magnet, and the obtained rare earth-transition metal-nitrogen system alloy powder.
SOLUTION : A production method includes : a first process in which an alkali solution is added with a solution including a rare earth compound and a transition metal compound, a generated precipitate is aged while being agitated; a second process in which an aged precipitate is cleaned being added with water, decantation is performed until a supernatant fluid becomes at most specific electric conductivity, then performed by dehydration to obtain a precursor of a complex oxide comprising a rare earth element and a transition metal element; a third process in which the precursor is heat-treated under the oxidizability atmosphere to obtain a complex oxide; a fourth process in which the complex oxide is heat-treated under the reduction property atmosphere, and thereby one part of a complex oxide is reduced to a rare earth-transition metal system alloy to make a part reduction complex oxide; a fifth process in which the part reduction complex oxide is mixed with a reduction agent, heat-treated in the specific inert gas atmosphere to obtain a rare earth-transition metal system alloy powder; and a sixth process in which the alloy powder is performed by nitriding.
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