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Multiphase Ti-Ni layer on titanium substrate by local alloying
Husťák, Miroslav ; Havlík, Petr (referee) ; Jan, Vít (advisor)
The theory section of this thesis is to describe properties and utilisation of titanium and titanium alloys as well as to deal with various methods of surface treatment and means of alloying a titanium surface layer with nickel. The experimental chapter of this thesis is to describe the creation of a hard surface layer on titanium substrate. In order to achieve a hard surface layer, a layer of nickel was electrodeposited on substrate made of commercially pure ASTM Grade 2 titanium which was subsequently melted with the help of an electron beam. A layer with changed chemical composition and microstructure was created by applying the aforementioned method on the titanium surface. In order to achieve a homogeneous microstructure in the surface layer, several samples with the surface layer were prepared by utilising different parameters of the electron beam. The samples were later tested for their microstructural homogeneity, chemical composition, and hardness.
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Highly porous ceramic oxide materials for environmental catalysis
Husťák, Miroslav ; Částková, Klára (referee) ; Cihlář, Jaroslav (advisor)
As far as the replacement of fossil fuels with more environmentally friendly options is concerned, hydrogen is considered as the most promising source of energy. Currently, hydrogen is mainly produced through the method of methane reforming. This method requires the utilisation of catalysts made of precious metals. This master's degree thesis therefore investigates perovskite materials SmCoO3, Sm0,8Ca0,2CoO2,9, SmCo0,8Al0,2O3 and Sm0,8Ca0,2Co0,8Al0,2O2,9, which could be utilised as catalysts in the production of hydrogen by methane reforming. Methane reformation occurs on the surface of a catalyst. Therefore, it is desirable to ensure that the specific surface area of a catalyst material is as large as possible. For that reason, the aforementioned perovskite materials were prepared by two sol-gel methods, which are expected to create perovskites with large specific surface areas. It was investigated in the course of the work how the method of synthesis affects the structure and catalytic properties of individual materials. The SmCo0,8Al0,2O3 material prepared by a sol-gel synthesis with propylene oxide as a gelation agent demonstrated the best results - the measurement of catalytic activity showed that the methane conversion had achieved the value of 99%.
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Highly porous ceramic oxide materials for environmental catalysis
Husťák, Miroslav ; Částková, Klára (referee) ; Cihlář, Jaroslav (advisor)
As far as the replacement of fossil fuels with more environmentally friendly options is concerned, hydrogen is considered as the most promising source of energy. Currently, hydrogen is mainly produced through the method of methane reforming. This method requires the utilisation of catalysts made of precious metals. This master's degree thesis therefore investigates perovskite materials SmCoO3, Sm0,8Ca0,2CoO2,9, SmCo0,8Al0,2O3 and Sm0,8Ca0,2Co0,8Al0,2O2,9, which could be utilised as catalysts in the production of hydrogen by methane reforming. Methane reformation occurs on the surface of a catalyst. Therefore, it is desirable to ensure that the specific surface area of a catalyst material is as large as possible. For that reason, the aforementioned perovskite materials were prepared by two sol-gel methods, which are expected to create perovskites with large specific surface areas. It was investigated in the course of the work how the method of synthesis affects the structure and catalytic properties of individual materials. The SmCo0,8Al0,2O3 material prepared by a sol-gel synthesis with propylene oxide as a gelation agent demonstrated the best results - the measurement of catalytic activity showed that the methane conversion had achieved the value of 99%.
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Multiphase Ti-Ni layer on titanium substrate by local alloying
Husťák, Miroslav ; Havlík, Petr (referee) ; Jan, Vít (advisor)
The theory section of this thesis is to describe properties and utilisation of titanium and titanium alloys as well as to deal with various methods of surface treatment and means of alloying a titanium surface layer with nickel. The experimental chapter of this thesis is to describe the creation of a hard surface layer on titanium substrate. In order to achieve a hard surface layer, a layer of nickel was electrodeposited on substrate made of commercially pure ASTM Grade 2 titanium which was subsequently melted with the help of an electron beam. A layer with changed chemical composition and microstructure was created by applying the aforementioned method on the titanium surface. In order to achieve a homogeneous microstructure in the surface layer, several samples with the surface layer were prepared by utilising different parameters of the electron beam. The samples were later tested for their microstructural homogeneity, chemical composition, and hardness.
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