RARE EARTH MAGNET POWDER AND RARE EARTH MAGNET

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PROBLEM TO BE SOLVED : To solve the problem that, regarding a magnet formed by mixing NdFeB powder and a fluorine compound such as NdF3, residual magnetic flux density reduces in accordance with the mixing amount of the fluorine compound, and energy product remarkably reduces, and to suppress such reduction of the magnetic properties. SOLUTION : A fluorine compound is applied to the surface of magnetic powder, so as to be formed, further, a diffusion layer is formed on the grain boundary between the fluorine compound and the magnetic powder, and a fluorine concentration difference is made in the fluorine compound. Further, the magnetic powder is composed of NdFeB powder as the main phase. COPYRIGHT : (C)2006, JPO&NCIPI