Bulletin of the Institute of Space and Aeronautical Science University of Tokyo
Bulletin of the Institute of Space and Aeronautical Science University of Tokyo
Abstract : A detailed investigation of the compaction behavior of powders was carried out with many different metal powders using a cylindrical single action die. From the density-pressure relationship obtained, three formulas on powder compaction Bal'shin's, Heckel's, and Kawakita's, were evaluated and the constants in the formulas were related to the yield strength of metals. The effect of the particle shape, the ratio of hight to diameter of the compact, and the lubrication of die wall were studied. Then the compaction behavior of mixed powder of two different metals was investigated. The density of the compact of mixed powder of two different metals can be obtained by the calculation, assuming that the compact is composed of two layers of different metals. The difference between measured density and calculated value depends on the composition and the strength characteristics of the powder. When the difference between yield strengths of two metals is large, measured density appears a little higher than the calcurated value, and the discrepancy changes with composition and becomes largest for the composition of about fifty per cent in volume each other.
金属粉末の圧縮に関する研究
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