Conclusions
A study was made of the densification and recrystallization of magnesia — alumina spinel of high dispersion during hot pressing in the temperature range 1200–1600°C, a pressure of 60–300 cm2, and a holding time of 10–30 min.
The relative density of 92–98% theoretical was achieved at 1300–1400°C, a pressure of 300 kg/cm2, and a soaking of 10 min. The spinel of theoretical density with a finely crystalline homogeneous structure was obtained by hot pressing at 1450–1600°C.
Intensive recrystallization of the spinels during hot pressing occurs in the temperature range ensuring maximum rate of densification (1450–1600°C).
The rate of recrystallization of the spinel grains during hot pressing at 1400°C and a pressure of 300 kg/cm2 and soakings of 10 and 30 min, has the order of 10−6 cm/sec and the maximum for the grains of diameter from 2 to 6μ.
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Report read at a symposium on pure oxide sintering, Khar'kov, 1968.
Deceased.
Translated from Ogneupory, No.6, pp. 32–36, June, 1970.
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Budnikov, P.P., Kharitonov, F.Y., Medvedovskaya, E.I. et al. Sintering and recrystallization of high-purity magnesia-alumina spinel during hot pressing. Refractories 11, 367–370 (1970). https://doi.org/10.1007/BF01295704
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DOI: https://doi.org/10.1007/BF01295704