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Low temperature tests and fracture toughness of selected ceramic materials
Beck, Branislav ; Drdlík, Daniel (referee) ; Chlup, Zdeněk (advisor)
Diploma thesis deals with the determination of fracture toughness values of sintered silicon carbide and casted basalt using both the Single Edge V-Notch Beam (SEVNB) and the Chevron Notched Beam (CNB) methods at room and cryogenic temperatures. The first part of this thesis offers general overview and categorization of ceramic materials. Fracture mechanics of the ceramic materials and available fracture toughness testing methods are discussed in following chapters. The last section in the theoretical part is aimed to the microstructure and properties of the silicon carbide. Experimental part of the work summarizes methods used for characterization of selected materials from the microstructural and fracture point of view. Preparation of samples for microstructural observation and samples for fracture toughness determination are described in details. The results of the fracture toughness data for sintered silicon carbide and cast-basalt obtained at room temperature and at -100 °C are displayed. Consideration of possible measurements errors and application of various fracture toughness testing methods are discussed in the next chapter of this work. The difference in the fracture toughness values with the decrease of testing temperature was found. The difference depends on both, the used method of fracture toughness determination and the material used for the tests. The most important results gained during the experimental work are summarized in the chapter “Conclusions”.
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Development of adhesive material for installation of cast basalt elements on metal base
Šikral, Martin ; Hodná, Jana (referee) ; Drochytka, Rostislav (advisor)
The diploma thesis deals with the development of polymeric adhesive material for the installation of cast basalt elements on a metal surface. The aim of this work is a development of the new adhesive material for the fixing of cast basalt elements to a metal base in high chemical stress environment and at higher temperature conditions. Furthermore, the thesis explores the possibility of using secondary raw materials as a substituttion of primary materials in the form of fillers. The thesis is also focuses on the determination of the advanced testing methods to verify the properties of devoloped adhesive materials, including monitoring the microstructure of the contact zone between the adhesive material and the surface.
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Development of resistant composite containing secondary raw materials for reconstruction of objects from cast basalt
Čtvrtečková, Anna ; Jakubík, Aleš (referee) ; Drochytka, Rostislav (advisor)
The diploma thesis is focused on the development of the resistant repair composite material using, secondary raw materials for the rehabilitation of objects made off the cast basalt with the highest possible filling of secondary raw materials. The resistant composite shall show the parameters approaching to the properties of cast basalt. The work is also focused at physical and mechanical properties of the composite material and its resistance to chemically aggressive conditions, and it is also aimed at the rehabilitation technology, especially the appropriate pre-treatment of the substrate to provide sufficient cohesion between the substrate and the repair composite.
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Low temperature tests and fracture toughness of selected ceramic materials
Beck, Branislav ; Drdlík, Daniel (referee) ; Chlup, Zdeněk (advisor)
Diploma thesis deals with the determination of fracture toughness values of sintered silicon carbide and casted basalt using both the Single Edge V-Notch Beam (SEVNB) and the Chevron Notched Beam (CNB) methods at room and cryogenic temperatures. The first part of this thesis offers general overview and categorization of ceramic materials. Fracture mechanics of the ceramic materials and available fracture toughness testing methods are discussed in following chapters. The last section in the theoretical part is aimed to the microstructure and properties of the silicon carbide. Experimental part of the work summarizes methods used for characterization of selected materials from the microstructural and fracture point of view. Preparation of samples for microstructural observation and samples for fracture toughness determination are described in details. The results of the fracture toughness data for sintered silicon carbide and cast-basalt obtained at room temperature and at -100 °C are displayed. Consideration of possible measurements errors and application of various fracture toughness testing methods are discussed in the next chapter of this work. The difference in the fracture toughness values with the decrease of testing temperature was found. The difference depends on both, the used method of fracture toughness determination and the material used for the tests. The most important results gained during the experimental work are summarized in the chapter “Conclusions”.
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