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Influence of hydrostatic pressing of a sol-gel obtained by a powder method on the sintering and properties of ceramics in the Al2O3-SiO2-ZrO2 system

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Conclusions

The influence of hydrostatic pressing with pressures up to 2.0 GPa of powder obtained by the sol-gel method on phase transformations in sintering and the properties of the sintered material in the Al2O3-SiO2-ZrO2 system has been studied. It was shown that an increase in hydrostatic pressing pressure from 0.3 to 2.0 GPa makes it possible to significantly increase the density and strength of the sintered material. In this case the primary factor hindering development of high strength is the increased pore size in the sintered material.

It was observed that an increase in hydrostatic pressing pressure of the powder leads to acceleration of decomposition of zircon and formation of mullite. These processes are accompanied by broadening of the x-ray lines of the newly formed phases.

The two-stage character of the sintering process was shown on the basis of the relationships of density and strength of the investigated material to sintering temperature. The conclusion that the low-temperature stage is caused by phase transformations in the sintering process and the high-temperature by diffusion processes in the newly formed phases was drawn.

The possible mechanism leading to appearance of the observed effects were considered.

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Authors and Affiliations

  1. Donetsk, Physicotechnical Institute, USSR

    V. V. Storozh, G. Ya. Akimov, N. G. Labinskaya, A. A. Dabizha & A. V. Prokof'ev

  2. Silitech PKP, Inkotech SP, USSR

    V. V. Storozh, G. Ya. Akimov, N. G. Labinskaya, A. A. Dabizha & A. V. Prokof'ev

Authors
  1. V. V. Storozh
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  2. G. Ya. Akimov
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  3. N. G. Labinskaya
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  4. A. A. Dabizha
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  5. A. V. Prokof'ev
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Translated from Ogneupory, No. 12, pp. 13–17, December, 1993.

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Storozh, V.V., Akimov, G.Y., Labinskaya, N.G. et al. Influence of hydrostatic pressing of a sol-gel obtained by a powder method on the sintering and properties of ceramics in the Al2O3-SiO2-ZrO2 system. Refractories 34, 596–601 (1993). https://doi.org/10.1007/BF01292746

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