Thermal diffusivity measurements of continuous casting powders for steel have systematically been carried out at high temperature by the laser flash method. The powder samples consist of SiO2 Al2O3, MgO, CaO, Na20 and CaF2 with the addition of TiO2, zro2,HfO2or iron oxide. At higher temperature, the measured values obtained by the laser flash method are known to involve, more or less, the contribution due to radiative component. Therefore, the thermal diffusivities of continuous casting powders for steel were estimated with sufficient reliability by separating such radiative component from measured values after due consideration for the variation of their absorption coefficients. The correction for radiative component is significant in samples including TiO2, ZrO2 iron oxide, because these samples show the significant variation in the absorption coefficients.
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