| 简介 |
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 : In the method for evaluating powder, pulverized powder is evaluated. After heat treatment is made at a prescribed temperature, specific surface area is measured. Powder to be evaluated is rare earth alloy powder used for manufacturing, for example, a rare earth sintered magnet. The heat treatment temperature is set to 100°C or higher, and 800°C or smaller. Heat treatment is made in vacuum, inert gas atmosphere, or hydrogen gas atmosphere.
COPYRIGHT : (C)2006, JPO&NCIPI |
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