POWDER EVALUATION METHOD, RARE EARTH SINTERED MAGNET, AND MANUFACTURING METHOD THEREOF

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PROBLEM TO BE SOLVED : To provide a powder evaluation method for accurately evaluating powder to the occurrence of cracks and chips in a forming body for forming the powder. SOLUTION : The powder evaluation method is used to evaluate pulverized powder. Tapping density is measured for a different number of tapping times, and the powder is evaluated on the basis of the ratio of the tapping density. When for example the tapping density if the tapping count is small is set to be tapping density A, and when the tapping density if the tapping count is large is set to be tapping density B, powder is evaluated by the tapping density A/tapping density B. The powder is rare earth alloy powder, for example, used for manufacturing a rare-earth sintered magnet. COPYRIGHT : (C)2006, JPO&NCIPI