Vysokoteplotní reologická charakterizace oxidických systémů na bázi SiO2-CaO-Al2O3-MgO-B2O3

Abstract

This master’s thesis deals with the high-temperature rheological characterization of oxide systems based on SiO2-CaO-Al2O3-MgO-B2O3. Oxide systems are first described in the theoretical part. An overview of the influence of each component is given based on the literature published so far. Further, the theoretical part also focuses on rheology, analytical methods for determining internal structure, and theoretical modelling of viscosity. The experimental part is devoted to rheological measurements of our own systems with varying B2O3 content. In particular, the influence of B2O3 on the start and end softening temperature, liquidus temperature, break temperature and viscosity dependence on temperature is studied. To further understand the influence of B2O3 on the properties of the system and its internal structure, the thesis is supported by the results of SEM-EDX, XRPD, FTIR and Raman spectroscopy analyses. Finally, the results of the theoretical modelling of viscosity-temperature dependence using widely used models are compared with experimentally determined results. The dependence of viscosity on temperature and B2O3 content is predicted by neural networks.