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Zirconia refractories


Results on the thermal conductivity of powders of monoclinic zirconia as a function of the grain size are presented. It is established that of all the investigated sintered powders of monoclinic ZrO2 the 1 – 0.5-mm and 2 – 1-mm fractions have the lowest thermal conductivity and the least apparent density (2.190 and 2.262 g/cm3). Fused powders of monoclinic and stabilized ZrO2 have a higher thermal conductivity than their sintered counterparts. Powders prepared from monoclinic ZrO2 with a burning-off addition of polystyrene have larger pores in the grains, which increases the share of the radiation component in the heat transfer, and hence their thermal conductivity is higher than in powders obtained by sintering pure monoclinic ZrO2. For the same reason, powders from void granules of the 3 – 0.5-mm fraction have a higher thermal conductivity than sintered monoclinic powders of ZrO2.

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Translated from Ogneupory, No. 1, pp. 26 – 29, January, 1995.

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Karaulov, A.G., Shlyakhova, T.M. & Akselrod, E.I. Zirconia refractories. Refractories 36, 29–32 (1995).

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  • Radiation
  • Grain Size
  • Heat Transfer
  • Zirconia
  • Thermal Conductivity