Conclusions
Solid solutions in the system ZrO2-MgO fired at a high temperature (above 2000°C) in vacuo (5 · 10−4mm Hg) for 5 h decompose as a result of the complete vaporization of the MgO. Solid solutions of ZrO2-CaO undergo partial decomposition when fired in these conditions. The addition of 2 mole % or more yttrium oxide to the solid solutions ZrO2-CaO and ZrO2-MgO results in significantly lower CaO and MgO vaporization.
The long-term exposure of solid solutions in the system ZrO2-CaO and ZrO2-MgO to 2200°C in a helium atmosphere results in the formation of an intercrystalline layer in which not only the stabilizing oxide but also the impurities are concentrated.
In three-component solid solutions which contain yttrium oxide the degree of vaporization is lower and the intergranular secondary phase less developed so that the degree of collective recrystallization is lower.
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Translated from Ogneupory, No. 8, pp. 44–48, August, 1976.
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Kuznetsov, A.K., Tikhonov, P.A. & Keler, É.K. The effect of long-term firing at 2100–2200°C on the concentration and microstructure of solid solutions in the systems ZrO2-Y2O3-CaO and ZrO2-Y2O3-MgO. Refractories 17, 502–505 (1976). https://doi.org/10.1007/BF01282344
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DOI: https://doi.org/10.1007/BF01282344