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Decarburisation and degassing of high-alloyed Cr steels under vacuum
Ertelt, Tomáš ; Pernica, Vítězslav (referee) ; Záděra, Antonín (advisor)
The work deals with the investigation of the effects of vacuum degassing and decarburization in high alloyed stainless steel. The reason for this is to increase corrosion resistance and mechanical properties. The theoretical part is devoted to the analysis of options to reduce carbon, nitrogen, hydrogen and manganese at atmospheric pressure and in vacuum. In experimental part there is the description of melting, calculation of conditions facilitating reduction of oxide inclusions as a function of the gas pressure in the furnace and the evaluation of the influence of vacuum on the content reduction of carbon, nitrogen and manganese.
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Advanced Abrasion Resistant Coatings for Vacuum Systems
Hégr, Eduard ; Kudláček,, Petr (referee) ; Hrubý, Vojtěch (referee) ; Švejcar, Jiří (advisor)
The thesis is focused on research of advanced surface resistant coatings which have a direct effect on increasing of functional properties of vacuum systems (eg reducing wear of individual pump components, surface inertia to aggressive gases/molecules). But they can also secondarily affect other important pump properties (eg reducing pump temperature). The studied layers/coatings are divided into three areas (i) hard anodic layer, (ii) hard anodic layer with PTFE coating and (iii) DLC coating. The initial material (substrate) is an aluminum-based alloy, which was used for this purpose. In presented thesis, the influence on increase of material and physical properties was demonstrated, such as the increase of hardness and abrasion resistance of the surface after the application of the anodic layer with PTFE coating. The theoretical part of thesis describes the basic principles of preparation of abrasion-resistant layers/coatings and also introduces the vacuum physics. It shows the basic principles of obtaining vacuum, which give a comprehensive picture of the importance of working with advanced coatings. The experimental part is divided into the evaluation of the microstructure of the sample material and the second part is focused on the experiments needed to obtain/measure the required properties, which can be further used to predict damage of the layers/coatings.
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Bayonet door of pressurized furnace
Brada, Karel ; Anderle, Martin (referee) ; Prokeš, František (advisor)
In this master's thesis a design of door for helium quenching furnace is described. Based on background research, several options for the design have been compared. All calculations were carried out based on structural needs resulting from high pressure gas quenching technology. By the ending of this thesis a mounting procedure and rough cost price estimation is described. Part of master's thesis is also a virtual 3D prototype and a drawing documentation.
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Precision and dynamics of linear piezo motors
Ilichman, Ondřej ; Vaške, František (referee) ; Houška, Pavel (advisor)
The work deals with the design, control, precision and dynamics of linear piezoelectric motors from PiezoMotor Uppsala AB. The aim of this thesis is to evaluate the applicability of the loaned engine in a mass spectrometer. In introduction‘s section of this work is discussing the design principles of functionality, materials used, procedure and types of piezoelectric motors. It focuses the choice of hardware and design of mechanical assemblies, which could replace the current mechanism with electromagnetic motors. Then we designed and fabricated a test report with hired piezoelectric motor. In NI LabView development environment is created test application for control and measurement. The final section is devoted to a summary of the positive and negative features of the hired piezoelectric motor and evaluation of accuracy and dynamics.
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Verification of multi-layer insulation in simulated space environment
Čapka, Filip ; Mašek, Jakub (referee) ; Lazar, Václav (advisor)
První část této práce se zaměřuje na popis momentálně používaných metod termo-regulace u vesmírných plavidel. Zaměřuje se konkrétně na vícevrstvou izolaci zvanou MLI. Která je jednou z hlavních pasivních forem kontroly teploty. Popisuje materiály používané na MLI a dále uvádí problémy, které nastávají při jejím používání a výrobě. V druhé části je poté popsán navrhnutý experiment, který má ověřit funkčnost MLI jako izolaci proti tepelným ztrátám. Na konci jsou shrnuty výsledky tohoto experimentu
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Electron beam welding technology
Skalka, Jan ; Vaněk, Mojmír (referee) ; Richter, Tomáš (advisor)
The bachelor thesis is devoted to analysis of electron beam welding technology. It is unconventional method of welding characterized by high quality weld and narrow heat-affected zone of welded parts. This technology, due to its development and qualities, has found its application in many industries, primarily in aviation and astronautics. The vacuum is limiting feature of this method and it is necessary for electron beam welding. However, even in this area, the development of new technologies have not stopped and generates concrete solutions to those problems. The thesis is also focused on elektron beam welding of rotary parts in the piece and serial production.
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Transitional motion analysis of the optically trapped particle in under-damped regime
Sűsserová, Martina ; Damková, Jana (referee) ; Harabiš, Vratislav (advisor)
The bachelor thesis deals with the analysis of the movement of optically trapped nanoparticles at low pressures and familiarizes with methods commonly used in these conditions. The practical part of this work was done in Matlab, where the undesirable signal interference was filtered out from the original data and their influence on the phase portraits of the acquired transients was analyzed. Furthermore, the damped oscillator parameters are obtained from the records of average trajectories and the distribution of position data during the transient compared with distribution of position data at stationary state by histograms.
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Steam ejector pump
Třináctý, Jan ; Baláš, Marek (referee) ; Šnajdárek, Ladislav (advisor)
The aim of this theses is to do search about maintaining vaccum in surface condensors and subsequently propose basic dimension of one stage steam ejector. The first part deals with the issue of vacuum. The following part is dedicated to description of various types of vacuum pumps. Hence it describes the principle of operation of each pump as well as their output. The following part deals with vacuum and vacuum technology in the field of power engineering. This part is dedicated to those types of vacuum pumps that are used in power engineering, especially to steam ejectors which are most widely used. The final part is addressed to the design of single stage steam ejector. This part contains the calculation of pump dimension. The conclusion evaluates the design of one stage steam ejector.
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