Conclusions
It has been established by experiment that for fine powders of angular particle shape maximum density in two-fraction mixtures is attained at a coarse component content of 60% (the density is the higher, the larger the ratio between the particle sizes of the coarse and fine fractions). The density of such a mixture may exceed the densities of the starting fractions by 26–37%.
A simple method of calculation has been developed enabling the densities of mixtures with different combinations of starting fraction contents to be determined from the optimum densities of the fractions and from the result of a single control experiment. The same method can be employed for calculating two probable ratios between the amounts of starting components at which any given mixture density will be attained.
Experiments have shown that a three-component system has a dome-shaped density diagram with a maximum density of more than 80% of theoretical; any given density (lower than maximum) can be obtained at various combinations of starting fraction contents, but the lower this density, the larger is the number of possible composition combinations.
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Literature cited
R. K. McGeary, “Mechanical packing of spherical particles,” J. Am. Ceram. Soc.,44, No. 10, 49–58 (1961).
V. V. Ivashchenko, I. P. Tartakovskii, and T. M. Golubev, “Vibration packing of spherical powders,” Poroshk. Metall., No. 8, 35–39 (1965).
V. V. Ivashchenko, I. P. Tartakovskii, and T. M. Golubev, “The investigation of the vibration compaction of two-component systems of spherical powders,” Poroshk. Metall., No. 9, 40–44 (1965).
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Translated from Poroshkovaya Metallurgiya, No. 7(187), pp. 26–30, July, 1978.
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Ivashchenko, V.V., Chmykh, O.V. Density regulation by choice of fractions in vibratory shaping. Powder Metall Met Ceram 17, 512–516 (1978). https://doi.org/10.1007/BF00791923
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DOI: https://doi.org/10.1007/BF00791923