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Effect of phase composition on the thermal shock resistance of zirconia

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Refractories Aims and scope

Conclusions

Products made on the basis of granular bodies from zirconium dioxide that has been completely stabilized in the cubic form or containing the monoclinic phase in a very limited quantity (about 8–10%), are unstable and unacceptable for operations in conditions where sharp periodic temperature changes or a high temperature gradient are possible.

The presence of 20–40% monoclinic phase in the products guarantees a microcracked structure in the material, capable of resisting thermal impact. It also prevents growth in these microcracks during repeat heating and cooling of the material, as a result of volume changes connected with polymorphism of ZrO2.

The choice of the conditions for determining thermal shock resistance should be made bearing in mind the proposed service conditions for the material. Together with a determination of the thermal shock resistance using the heat-cycle method up to a weight loss of 20%, it is desirable to determine the residual strength of the material (tensile), and also to use the calculated coefficient of thermal expansion of the material obtained from its physicomechanical characteristics.

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Authors and Affiliations

  1. Ukrainian Refractories Research Institute, Ukraine

    A. A. Grebenyuk, A. G. Karaulov, V. I. Dauknis, G. A. Prantskyavichyus & V. L. Yurenas

  2. Institute of Power and Electric Engineering, USSR

    A. A. Grebenyuk, A. G. Karaulov, V. I. Dauknis, G. A. Prantskyavichyus & V. L. Yurenas

Authors
  1. A. A. Grebenyuk
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  2. A. G. Karaulov
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  3. V. I. Dauknis
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  4. G. A. Prantskyavichyus
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  5. V. L. Yurenas
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Translated from Ogneupory, No. 1, pp. 42–49, January, 1968.

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Grebenyuk, A.A., Karaulov, A.G., Dauknis, V.I. et al. Effect of phase composition on the thermal shock resistance of zirconia. Refractories 9, 44–51 (1968). https://doi.org/10.1007/BF01286347

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