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The analysis of Cu-Sn-Sb ternary alloy
Kučera, Jan ; Doubrava, Marek (referee) ; Jan, Vít (advisor)
This bacholor thesis deals with substituting silver-based material, currently used for experimental semi-liquid extrusion. The proposed material is from the Cu-Sb-Sn system. The theoretical part of the work deals with soldering and phase diagrams. The experimental part is devoted to the analysis of three proposed alloys from the Cu-Sb-Sn system, their structural and mechanical properties. Thermal analyzes of the alloys were performed using differential scanning calorimetry (DSC), the microstructure using a light microscope and a scanning electron microscope, and a hardness tester was also used to determine the hardness. The results are summarized in the discussion.
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Immiscible alloy based on Fe-Cu system
Semerák, Petr ; Havlík, Petr (referee) ; Jan, Vít (advisor)
The aim of this work is the preparation of FeCuMn alloy in equimolar composition by melting and the analysis of the resulting microstructure. The theoretical part of the work deals with miscibility and the use of immiscible systems in practical applications. Furthermore, the influence of cooling rate and the effect of the ratio of the components of the immiscible Fe-Cu system on the resulting microstructure are described. The practical part of the work presents the microstructure of FeCuMn alloy, which was prepared by melting in an induction furnace under a protective atmosphere of argon. Furthermore, the practical part deals with the chemical composition of the individual phases and the shape of the resulting phases. For the FeCuMn alloy, the melting temperature of the phases is analysed, the material is also deformed, and the hardness of the deformed and undeformed material is evaluated. In the subsequent discussion, the results from the experimental part are related to published experimental results by other authors.
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LiF-NaF-KF Coolant Phase Diagram
Mikula, Hynek ; Matal, Oldřich (advisor)
In introduction this graduation theses discource about phase diagrams and thein fission. Next part is about concrete phase diagrams NaF – KF, NaF – LiF, KF – LiF. Their determination trough use of cooling surves and their specification trough use of numerical method. Conclusion contains proposal of method for concrete phase diagram of NaF – KF – LiF.
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Hydrogels amino-dextran-surfactant: phase diagram
Daňková, Kristýna ; Hurčíková, Andrea (referee) ; Pekař, Miloslav (advisor)
This bachelor thesis deals with a study about hydrogel systems based on the physical interactions of the oppositely charged particles, specifically interactions between positive polyelectrolyte and negative detergent. The phase diagrams were created based on the visual evaluation of results of the laboratory experiment, which is a part of this thesis, for in advance chosen concentration of the polymer diethylaminoethyl-dextran hydrochloride and detergents sodium dodecyl sulphate and sodium tetradecyl sulphate. These phase diagrams characterize incurred dextran systems.
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Phase equilibrium curve of gas mixtures
Fúdor, Vlastimil ; Habán, Vladimír (referee) ; Himr, Daniel (advisor)
This thesis is focused on the construction phase diagrams of various gas mixtures. The properties of real gas mixtures are modeled by two equations of state. The simpler one is the Peng-Robinson equation of state. The more complex and accurate equation of state is the GERG-2004. Two methods are used to construct the phase diagram namely the successive substitution method and the Newton method. The numerical procedure has been developed in Python programming language. A zip archive of the developed program is an integral part of the thesis. This program solves gas mixtures consisting of nitrogen, carbon dioxide, methane, ethane, propane, n-butane, isobutane, n-pentane, isopentane, n-hexane, n-heptane.
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The analysis of Fe-Cr-Ti binary alloys
Lauš, Lukáš ; Havlík, Petr (referee) ; Jan, Vít (advisor)
The aim of this bachelor thesis is the preparation of high volume ratio of intermediate phases in the microstructure of Ti-Fe, Fe-Cr, Ti-Cr. The bibliographic introduction includes basic information about phase equilibrium diagrams. It also includes phases in metal systems and the binary diagrams of the prepared alloys. The experimental part deals with the analysis of the alloy phases. The experimental part also deals with determination of alloys microstructure parts using calculated pseudobinary diagrams. It has been found, that although prepared from pure stock materials, the produced alloys were not binary and contained 0,6–1,4 at. % Si. Intermediate phases were found in Ti-Fe and Ti-Cr alloys. According to the calculated diagrams comparison, all of the prepared alloys were not in equilibrium.
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Lead-Free solder thermal and microstructure analysis
Klepárníková, Eliška ; Molliková, Eva (referee) ; Jan, Vít (advisor)
The bachelor thesis deals with Ag-Sn-Sb system, construction of pseudobinary diagram 90An10Sb – 90Sn10Sb and construction of ternary diagram at 20 C. The theoretical part deals with soldering, phase diagrams and methodics of determination of phase diagrams. The experimental part is focused on describing the creation of five alloys and their further exploration. Alloy analyzes were performed by differential scanning calorimetry (DSC), light microscope and scanning electron microscope. Results from these thermal and microstructural analyzes were processed into the resulting pseudobinary and ternary diagram.
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The possibilities of SMD components soldering by equipment Fritsch
Juračka, Martin ; Šandera, Josef (referee) ; Adámek, Martin (advisor)
This thesis focuses on soldering technology in microelectronics. It describes in detail the basic ways of soldering and repairs in electronics. This piece of work shows the principles of technological equipment for bulk soldering and used repairing devices. In the theoretical part of this work there are also briefly described the packages for integrated circuits that were used in the practical part of the thesis. The practical part of the thesis deals with setting of the heat profiles for hot air repair station Fritsch Mikroplacer for LQFP64, SOIC16, TSSOP14, QFN16 and DSBGA5 packages. The heat profiles for assembly and disassembly of the particular types of the packages on designed and manufactured test printed circuit board were set and tested. The resulting heat profiles are compared with the recommended heat profile of an ordinary solder paste SnAg3Cu0,5 which was used for the test. This thesis can serve as an aid for the further settings of heat profiles in other types of packages not only on Fritsch Mikroplacer devices, but also on other repairing devices of this type.
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Thermal and microstructure analysis of binary eutectic system
Bielková, Kateřina ; Klepárníková, Eliška (referee) ; Adam, Ondřej (advisor)
This bachelor thesis deals with the analysis and verification of binary diagram of the Sn-Bi system. The theoretical segment of the thesis describes the common phase transformations and methods of their research, especially thermal analysis. The experimental part is focused on the analysis of six samples (four alloys and two pure metals). Analyses were performed by differential scanning calorimetry (DSC) and scanning electron microscope. The measured data were compared with the given binary diagram, with which it corresponds relatively well.
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Hydrogels hyaluronan-surfactant: phase diagram
Gruberová, Eliška ; Hurčíková, Andrea (referee) ; Pekař, Miloslav (advisor)
This bachelor’s thesis deals with phase separation of the hyaluronan-cationic surfactant system in a model physiological solution of 0,15 M NaCl resulting in gel formation. The most widely used concentrations of hyaluronan and a wide range of surfactant concentrations was used to form the gel. We have investigated under which conditions the greatest amount of compacted gel was produced. It has been found that phase separation occurs over the entire concentration range. The largest amount of gel was formed at the highest concentration of both hyaluronan and surfactant. The results were plotted in well-arranged graphs. A hydrophobic colorant was used to indicate the presence of micellar formations and the results were depicted in a schematic phase diagram.
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