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Smart materials
Valenová, Ludmila ; Němec, Karel (referee) ; Molliková, Eva (advisor)
The bachelor thesis deals with smart materials. In summary, it describes the general classification of smart materials into individual groups. Describing the properties of individual groups and using these materials in practice. In more detail, there are described groups of shape memory materials, color changing materials under the external stimulus, light emitting materials and materials based on piezoelectric effect.
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Optimization of 3D printing and post-processing of advanced ceramics based on calcium phosphate
Valenová, Ludmila ; Hadraba, Hynek (referee) ; Drdlík, Daniel (advisor)
The diploma thesis is related to the preparation of hydroxyapatite complex structures by additive manufacturing known as Lithography based ceramics manufacturing – LCM. A photosensitive suspension containing hydroxyapatite particles was used for 3D printing of ceramic complex structures. The influence of printing parameters on the resulting macrostructure, microstructure, density, and dimensional accuracy was evaluated. The aim was to obtain ceramic components without delamination of the layers and optimise following post-processing steps (cleaning and thermal treatment). It was found that the exposure time has a significant effect on the dimensional accuracy of printed parts. During observation microstructure of printed parts, a microporosity at the interface of printed layers, which can cause delamination of several layers was identified. High-temperature dilatometry showed different temperature of beginning densification process in the longitudinal and perpendicular directions to the layers. That could be an initiation mechanism for delamination of the layers. X-ray diffraction analysis determined a single-phase composition of powder in photosensitive suspension and sintered parts. A commercial product LithaSol 20 was suggested as a suitable cleaning agent and efficiency of the ultrasound field for cleaning was demonstrated. Based on the thermogravimetric analysis an optimized cycle of heat treatment was designed. The optimisation led to time saving (49 hours), while maintaining density, dimensional accuracy and macrostructure of the 3D printed structures.
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Optimization of 3D printing and post-processing of advanced ceramics based on calcium phosphate
Valenová, Ludmila ; Hadraba, Hynek (referee) ; Drdlík, Daniel (advisor)
The diploma thesis is related to the preparation of hydroxyapatite complex structures by additive manufacturing known as Lithography based ceramics manufacturing – LCM. A photosensitive suspension containing hydroxyapatite particles was used for 3D printing of ceramic complex structures. The influence of printing parameters on the resulting macrostructure, microstructure, density, and dimensional accuracy was evaluated. The aim was to obtain ceramic components without delamination of the layers and optimise following post-processing steps (cleaning and thermal treatment). It was found that the exposure time has a significant effect on the dimensional accuracy of printed parts. During observation microstructure of printed parts, a microporosity at the interface of printed layers, which can cause delamination of several layers was identified. High-temperature dilatometry showed different temperature of beginning densification process in the longitudinal and perpendicular directions to the layers. That could be an initiation mechanism for delamination of the layers. X-ray diffraction analysis determined a single-phase composition of powder in photosensitive suspension and sintered parts. A commercial product LithaSol 20 was suggested as a suitable cleaning agent and efficiency of the ultrasound field for cleaning was demonstrated. Based on the thermogravimetric analysis an optimized cycle of heat treatment was designed. The optimisation led to time saving (49 hours), while maintaining density, dimensional accuracy and macrostructure of the 3D printed structures.
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Smart materials
Valenová, Ludmila ; Němec, Karel (referee) ; Molliková, Eva (advisor)
The bachelor thesis deals with smart materials. In summary, it describes the general classification of smart materials into individual groups. Describing the properties of individual groups and using these materials in practice. In more detail, there are described groups of shape memory materials, color changing materials under the external stimulus, light emitting materials and materials based on piezoelectric effect.
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