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Kurzfassung der Dissertation von Frau Dr.-Ing. Luayo Pan

MgO-C refractories are widely used in steelmaking vessels, where they are exposed to high temperatures, molten steel, slag attack, mechanical loading, and repeated thermal cycling. Their thermal diffusivity and thermal conductivity are important for evaluating heat transfer, temperature gradients, thermal stresses, and thermal shock resistance. However, their reliable interpretation of these properties is challenging due to the heterogeneous and direction-dependent microstructure. In this study, the temperature-dependent thermal transport behaviour of MgO-C refractories was investigated using laser flash analysis and the transient plane source method. The results show that the measured thermal diffusivity and thermal conductivity should be regarded as effective values rather than purely intrinsic material property. By distinguishing the effects of sample preparation, thermal history, measurement methods, and microstructural differences associated with the compaction pressure, this study provides a basis for the reliable interpretation of the thermal conductivity properties of MgO-C refractory materials.