Thermal conductivity of archaeological ceramics: The effect of inclusions, porosity and firing temperature

In former studies on archaeological cooking pots or archaeological pyrotechnical ceramics their thermal conductivity was discussed only in relation with other parameters but, it was never actually determined. In the present study a modified Lees’ disk setup was used in order to determine the thermal conductivity of a series of experimental ceramic disks. As for the manufacture of these disks typical ceramic fabrics were simulated, which can be observed in archaeological cooking pots. In order to assess the effect of production parameters on the thermal conductivity, two different clays, one non-calcareous and one calcareous, were tempered with different amounts of granite or phyllite and were fired at three different temperatures: 550 °C, 850 °C and 1050 °C. The most important parameters emerged as the degree of vitrification and porosity of the ceramic matrix.