METHOD OF EVALUATING ORIENTATION DEGREE, RARE-EARTH SINTERED MAGNET AND ITS MANUFACTURING METHOD

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PROBLEM TO BE SOLVED : To provide a method of evaluating an orientation degree capable of accurately evaluating the orientation degree in a macroscopic region, and to achieve a rare-earth sintered magnet whose whole orientation degree is high and which is excellent in magnetization characteristic or the like. SOLUTION : A molding obtained by compressively molding rare-earth alloy powder or its sintered compact is equally divided into odd number of pieces, and X-ray diffraction processes are applied on the divided pieces of the center section and the outermost section, and then orientation degrees of respective divided pieces are calculated by using a Lotgering method, thereby evaluating variations in the orientation degrees. When calculating them, vector compensation is applied on X-ray diffraction intensity of each diffraction peak. In the rare-earth sintered magnet, the difference of calculated orientation degree subjected to the vector compensation between the divided piece of the center section and the divided piece of the outermost section is 1.5% or less. COPYRIGHT : (C)2006, JPO&NCIPI