| 摘要 |
PROBLEM TO BE SOLVED: To easily, accurately and quantitatively determine a vacancy existence ratio in the powder to be measured. SOLUTION: This vacancy existence ratio measuring method measures a density of the measuring-objective powder, measures again after crushing the measuring-objective powder, measures again after crushing again the crushed measuring-objective powder, repeats the such measurements to find an asymptotic value of the density, and calculates the existence ratio of vacancy existing in the measuring-objective powder, based on the density measured in the first and the asymptotic value of the density. COPYRIGHT: (C)2009,JPO&INPIT
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