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Development of new technologies of translucent architectural concrete
Adámková, Aneta ; Novosad,, Petr (referee) ; Hela, Rudolf (advisor)
The diploma thesis follows up on the bachelor thesis and deals with the issue of light-transmitting concrete LTC. The aim of thesis determines the transparency and its decrease due to durability. The terotical part deals with extension of LTC issues and follows up reserch from bachelor thesis. The teory is also focused on the issue of glass optical fibers. The experimental part deals with the influence of selected durability test on transparency of LTC. Transparency is determined by mesuring devise called black box. In the conclusion is summarized influences witch affects transparency and evaluation of whether the selected fibers are suitable for outdoor use.
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Processing of compact polycrystalline YAG ceramics
Kaplan, Lukáš ; Pouchlý, Václav (referee) ; Kachlík, Martin (advisor)
In the literary part of this master thesis a research on various methods of preparation of dense polycrystalline YAG ceramics and the effects of sintering on the densification and other desired properties of such prepared YAG ceramics was carried out, the transparency after addition of dopant elements was also discussed. In the experimental part of the thesis, samples of dense polycrystalline YAG ceramics were prepared by SSR method and the effect of sintering on the densification and porosity of the YAG ceramic samples was studied. Relative density, porosity, phase purity and transparency were measured on the sintered samples. These measurements were compared with the results of the works reported in the literature section.
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Milling of pre-sintered ceramics using CAD / CAM
Ščasnovič, Erik ; Pouchlý, Václav (referee) ; Kaštyl, Jaroslav (advisor)
Diploma thesis is focused on determination of proper pre-sintering temperatures of zirconia ceramic blanks intended for CAD-CAM milling. Functional properties of milled and sintered samples are also discussed. Experimental part is aimed on determination of properties of blanks which affect directly the CAD-CAM process. Another solved issue is definition of mechanical and physical properties of sintered bodies. Final properties are compared with properties of ceramic blanks made from standard ceramic powder. Dental crown, dental three-unit bridge and partial knee joint were prepared successfully. The tests of geometric accuracy were performed on dental crown as well as on partial knee joint replacement with using 3D scanner.
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Special measurements in the field of 3D printing
ČECH, Jiří
The bachelor thesis focuses on the use of 3D printing in the field of measurement with a specific focus on translucency. Samples have been created to investigate which 3D printing parameters affect the translucency of the samples. The samples are printed under different nozzle temperatures, printing speeds, layer heights and other parameters. The task of the bachelor thesis was the design and optimization of the measuring equipment, using additive technologies to reduce the cost of production. The measuring device is based on an integrating sphere, which is a specialized device used for measuring various optical properties of materials. The main contribution of this work is the successful design and manufacture of a device that meets the specific requirements given by the properties of the samples for which it was intended. The measuring device does not display values exceeding 100 % transparency, unlike its prototype where values of transparency often exceeded 120 %. This inaccuracy was due to the lack of light scattering in front of the sensor, so a new device was made based on the spherical integrator. The device was tested on three samples, on which the prototype measurements yielded a translucency of over 100 %. The new measuring device no longer exhibits such errors. These particular samples show translucencies of 85, 74 and 85 % compared to the prototype measurement where these samples normally exceeded 120 %.
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Processing of compact polycrystalline YAG ceramics
Kaplan, Lukáš ; Pouchlý, Václav (referee) ; Kachlík, Martin (advisor)
In the literary part of this master thesis a research on various methods of preparation of dense polycrystalline YAG ceramics and the effects of sintering on the densification and other desired properties of such prepared YAG ceramics was carried out, the transparency after addition of dopant elements was also discussed. In the experimental part of the thesis, samples of dense polycrystalline YAG ceramics were prepared by SSR method and the effect of sintering on the densification and porosity of the YAG ceramic samples was studied. Relative density, porosity, phase purity and transparency were measured on the sintered samples. These measurements were compared with the results of the works reported in the literature section.
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Milling of pre-sintered ceramics using CAD / CAM
Ščasnovič, Erik ; Pouchlý, Václav (referee) ; Kaštyl, Jaroslav (advisor)
Diploma thesis is focused on determination of proper pre-sintering temperatures of zirconia ceramic blanks intended for CAD-CAM milling. Functional properties of milled and sintered samples are also discussed. Experimental part is aimed on determination of properties of blanks which affect directly the CAD-CAM process. Another solved issue is definition of mechanical and physical properties of sintered bodies. Final properties are compared with properties of ceramic blanks made from standard ceramic powder. Dental crown, dental three-unit bridge and partial knee joint were prepared successfully. The tests of geometric accuracy were performed on dental crown as well as on partial knee joint replacement with using 3D scanner.
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Development of new technologies of translucent architectural concrete
Adámková, Aneta ; Novosad,, Petr (referee) ; Hela, Rudolf (advisor)
The diploma thesis follows up on the bachelor thesis and deals with the issue of light-transmitting concrete LTC. The aim of thesis determines the transparency and its decrease due to durability. The terotical part deals with extension of LTC issues and follows up reserch from bachelor thesis. The teory is also focused on the issue of glass optical fibers. The experimental part deals with the influence of selected durability test on transparency of LTC. Transparency is determined by mesuring devise called black box. In the conclusion is summarized influences witch affects transparency and evaluation of whether the selected fibers are suitable for outdoor use.
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