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Optimization of metallurgical processes in aluminum alloys foundry
Halaška, Jan ; Lána, Ivo (referee) ; Kaňa, Václav (advisor)
Diploma thesis examines the influence of the preparation and metallurgical treatment on the mechanical properties and structure of aluminium alloys Al-Si. The experimental part was carried out at MSR Engines s.r.o. This part describes the current (sodium modification) and newly proposed (strontium modification) state of preparation and metallurgical processing of melt. There is state the course of experimental melting processes, testing of samples, evaluation of tests and observation of the impact of individual modifiers on the structure.
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Influence of degassing parameters on quality of Al castings
Jeřábek, Petr ; Horenský, Jiří (referee) ; Vašťák, Patrik (advisor)
This master’s thesis is focused on optimalization of degassing parameters in the foundry plant and effect of these parameters on mechanical properties of Al-Si alloys. In practical part is used factorial experiment to research effect of degassing parameters on mechanical properties and dichte index. After optimalization the new process is validated by comparing with the previous one. This experiment was taken on AlSi7Mg0,6 alloy in foundry plant MESIT foundry, a.s.
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Perspektiva využití skládkového plynu ze skládky komunálního odpadu
Stránský, Marek
Landfilling is the most common way of dealing with municipal waste in the Czech Republic. In average 50 % of municipal waste is dumped on landfills. Municipal waste contains organically degradable components, at which decomposition occurs landfill biogas. For the creation of landfill gas there must be strictly anaerobic environment conditions and sufficient humidity. Creation of gas also affects the temperature, pH and the composition of the decomposed material.To prevent the free release of methane, operators of municipal landfills have an obligation to collect and process landfill gas. Since landfill gas is perceived as alternative energy source, if it has sufficient amount of methane it can be used as fuel in a cogeneration units.Today's legislation is aimed to reduce the proportion of organically degradable waste imposed on landfills. Therefore, despite the current spread, use of landfill gas production has decreasing future prospects. In the thesis I deal with conditions of forming landfill gas and its collecting. I also analyzed the quantity and quality of produced gas in landfill of municipal waste in Ronov nad Sazavou.
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Secondary metallurgy in foundries
Klika, Jiří ; Šenberger, Jaroslav (referee) ; Pernica, Vítězslav (advisor)
The aim of this bachelor thesis is to write a literary research about various methods of secondary metallurgy. In the thesis is described principle of methods and its advantages and disadvantages after installation in the manufactory, especially principle of steelmaking methods. It mainly concerns advantages of secondary metallurgy as degassing, decarburisation, desulphurisation and chemical or heat homogenization of liquid metal in the ladle.
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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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