| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of a rare earth-transition metal-nitrogen alloy powder having excellent magnetic properties for a permanent magnet, a rare earth-transition metal-nitrogen alloy powder obtained by the method, a bond magnet composition using the same, and a bond magnet which allows various equipment to be downsized and highly characterized.
SOLUTION : A solution including a rare earth compound and a transition metal compound is added to an alkali solution, and the mixture is agitated to produce a precipitate. The precipitate is repeatedly decanted until the conductivity of the supernatant reaches a specific value. Subsequently the precipitate is washed and dried, so that a complex compound precursor including the rare earth compound and the transition metal compound is obtained. The precursor is heated to obtain a complex oxide including a rare earth element and a transition metal element. At least a part of the complex oxide obtained is reduced to form a partially reduced complex oxide which contains a rare earth-transition metal alloy. The manufacturing method of a rare earth-transition metal-nitrogen alloy powder having improved heat resistance and weatherability includes using the partially reduced complex oxide as raw material in a reduction-diffusion process, and forming a phosphate coating film on the surface of the rare earth-transition metal alloy powder obtained. The alloy powder is obtained by the method. The bond magnet composition uses the alloy powder. The bond magnet allows various equipment to be downsized and highly characterized.
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