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Measurements have been made on the thermal conductivity and thermal diffusivity for corundum refractories based on hollow granules having apparent densities of 0.3–0.6 g/cm3, as well as foam corundum ones at about 0.5 g/cm3, which cover the range 200–1700°C. A conduction model has been devised that gives a qualitative explanation of the temperature and porosity effects.

Experimental data on the thermal conductivity of refractory fills based on MgO, Y2O3, ZrO2, and Al2O3 with different fraction composition were obtained. The limits of applicability of the model of thermal conductivity of granular systems for materials of this class were determined.

On a prepare un programme pour calculer sur ordinateur l'erreur de mesure de la conductivite et de la diffusivite thermique resultant de la distorsion du champ de temperature pour differentes methodes d'installation des transducteurs de temperature

This paper describes a method of measurement of the thermal diffusivity of refractory powders at temperatures of 400-2100 K in different gaseous media in the p = 10/sup 2/-10/sup 5/ Pa pressure range. The method developed is based on the rules of steady heating of cylindrical specimens. The calculation equation has a form characteristic of regular conditions of the second order in an infinite cylinder with corrections for the deviation from quasisteadiness and for the nonuniformity of the temperature field in the specimen. Thermal diffusivities of magnesite powder and PIT-1 yttrium oxide powder are shown in different gaseous media. The method developed possesses satisfactory accuracy and makes it possible to obtain information on the thermal divusivity and conductivity of refractory powders in a broad temperature range and in the area of high temperature.