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High-strength macrodefect-free composites for refractory applications
Ryšková, Martina ; Másilko, Jiří (referee) ; Šoukal, František (advisor)
The subject of the bachelor thesis is the study of heat-resistant macrodefect-free (MDF) cements based on calcium-aluminate cement and organic polymer polyvinylalcohol. Macrodefect-free cements are particularly important in excellent mechanical parameters, which include tensile strength in bending. These materials are characterized by their low porosity and the absence of microcracks. The main role of the MDF cements takes binding and non-flush interaction with polymer cement, which affect the chemical and physical-mechanical properties. The main problem in applying the MDF cements is the low water resistance. To prepare macrodefect-free samples were used calcium-aluminate cement (SECAR 51, SECAR 71) and polymer polyvinyl Gohsenol GH 17S. They were observed changes in mechanical properties depend on the type of curing samples were cured at laboratory temperature and 70°C. Samples annealed at 1000 ° C and then tested for tensile strength in bending before and after annealing, compared to mechanical properties. Thermal stress was tested by doping a microscope TGA-DTA-EGA and TMA analysis.
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Polymer-cement composites of increased refractoriness
Ryšková, Martina ; Opravil, Tomáš (referee) ; Šoukal, František (advisor)
The subject of the diploma thesis is the preparation of macro-defect-free (MDF) composites based on calcium-aluminate cement and organic polymer polyvinylalcohol. Attention focused on the optimization of the dose, the degree of hydrolysis and molecular weight of the polymer with respect to the heat resistance of the material. Thermal degradation of polyvinyl alcohol leads to changes in the structure of MDF composite. The study was mainly focused on the characteristics of polyvinyl alcohol dosage associated with the resultant mechanical properties of the material. During the work were monitored for changes in the mechanical properties of samples were cured at 60 °C and subsequently fired at 180 °C, 600 °C, 1000 °C and 1400 °C. It was tested in flexural strength, heat microscopy, TGA-DTA-EGA and SEM analysis.
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Polymer-cement composites of increased refractoriness
Ryšková, Martina ; Opravil, Tomáš (referee) ; Šoukal, František (advisor)
The subject of the diploma thesis is the preparation of macro-defect-free (MDF) composites based on calcium-aluminate cement and organic polymer polyvinylalcohol. Attention focused on the optimization of the dose, the degree of hydrolysis and molecular weight of the polymer with respect to the heat resistance of the material. Thermal degradation of polyvinyl alcohol leads to changes in the structure of MDF composite. The study was mainly focused on the characteristics of polyvinyl alcohol dosage associated with the resultant mechanical properties of the material. During the work were monitored for changes in the mechanical properties of samples were cured at 60 °C and subsequently fired at 180 °C, 600 °C, 1000 °C and 1400 °C. It was tested in flexural strength, heat microscopy, TGA-DTA-EGA and SEM analysis.
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High-strength macrodefect-free composites for refractory applications
Ryšková, Martina ; Másilko, Jiří (referee) ; Šoukal, František (advisor)
The subject of the bachelor thesis is the study of heat-resistant macrodefect-free (MDF) cements based on calcium-aluminate cement and organic polymer polyvinylalcohol. Macrodefect-free cements are particularly important in excellent mechanical parameters, which include tensile strength in bending. These materials are characterized by their low porosity and the absence of microcracks. The main role of the MDF cements takes binding and non-flush interaction with polymer cement, which affect the chemical and physical-mechanical properties. The main problem in applying the MDF cements is the low water resistance. To prepare macrodefect-free samples were used calcium-aluminate cement (SECAR 51, SECAR 71) and polymer polyvinyl Gohsenol GH 17S. They were observed changes in mechanical properties depend on the type of curing samples were cured at laboratory temperature and 70°C. Samples annealed at 1000 ° C and then tested for tensile strength in bending before and after annealing, compared to mechanical properties. Thermal stress was tested by doping a microscope TGA-DTA-EGA and TMA analysis.
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