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Controlled melt gassing and its influence on properties and structure of aluminum alloy castings
Jagošová, Adriana ; Luňák, Milan (referee) ; Kaňa, Václav (advisor)
The first chapter of the thesis deals with the occurrence of gases in the aluminum melt, what are their sources, what is the solubility of hydrogen in the aluminum melt and the formation of gas cavities. The second chapter divides the defects caused or associated with the presence of gases in the casting. They can be bubbles, shrinkage, or diluents. Pore morphology and its influence on mechanical properties are discussed. The third chapter deals with methods of melt degassing, either by vacuuming, bubbling with active or inert gases, or using special methods and preparations. In the fourth chapter methods for determination of hydrogen content in aluminum melt are divided into analytical methods, methods based on Sieverts law and indication methods. The fifth chapter deals with controlled gassing, its objectives and the preparations used for this purpose. The sixth chapter describes the experiment where the influence of the amount of Probat Fluss Micro 100 on the different casting thicknesses and its results were investigated using a test casting.
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Furnaces used for manufacturing of castings from non-ferrous alloys
Jagošová, Adriana ; Pernica, Vítězslav (referee) ; Bořil, Petr (advisor)
This bachelor thesis focuses on the issue of furnaces used for casting non-ferrous alloys. The first chapter describes the properties of foundry alloys in general, the specific foundry properties of selected non-ferrous alloys and the principle of melt during their casting. The second chapter describes the criteria that are important for comparing furnaces work and for their selection. The third chapter lists the furnace distribution in terms of heating. The main part of the thesis is the fourth chapter, which includes the distribution and detailed description of the melting and maintenance furnaces, as well as the non-ferrous alloy heat treatment furnace.
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Controlled melt gassing and its influence on properties and structure of aluminum alloy castings
Jagošová, Adriana ; Luňák, Milan (referee) ; Kaňa, Václav (advisor)
The first chapter of the thesis deals with the occurrence of gases in the aluminum melt, what are their sources, what is the solubility of hydrogen in the aluminum melt and the formation of gas cavities. The second chapter divides the defects caused or associated with the presence of gases in the casting. They can be bubbles, shrinkage, or diluents. Pore morphology and its influence on mechanical properties are discussed. The third chapter deals with methods of melt degassing, either by vacuuming, bubbling with active or inert gases, or using special methods and preparations. In the fourth chapter methods for determination of hydrogen content in aluminum melt are divided into analytical methods, methods based on Sieverts law and indication methods. The fifth chapter deals with controlled gassing, its objectives and the preparations used for this purpose. The sixth chapter describes the experiment where the influence of the amount of Probat Fluss Micro 100 on the different casting thicknesses and its results were investigated using a test casting.
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Furnaces used for manufacturing of castings from non-ferrous alloys
Jagošová, Adriana ; Pernica, Vítězslav (referee) ; Bořil, Petr (advisor)
This bachelor thesis focuses on the issue of furnaces used for casting non-ferrous alloys. The first chapter describes the properties of foundry alloys in general, the specific foundry properties of selected non-ferrous alloys and the principle of melt during their casting. The second chapter describes the criteria that are important for comparing furnaces work and for their selection. The third chapter lists the furnace distribution in terms of heating. The main part of the thesis is the fourth chapter, which includes the distribution and detailed description of the melting and maintenance furnaces, as well as the non-ferrous alloy heat treatment furnace.
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