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Surface cleaning of archaeological objects by plasma generated in water solutions
Tihonová, Jitka ; Grossmannová, Hana (referee) ; Krčma, František (advisor)
This bachelor thesis is focused on the plasma surface treatment of historical ceramics by low temperature electrical discharges in water solution. Four samples were chosen - two of the Lusatian Urnfields Culture and two of Anabaptist Faience. The treatment was done at minimum power of the power supply. Stainless steel electrode and a specially designed electrode system with wolfram wire in the quartz glass capillary were used for generation of discharge using an audio frequency power supply. Elemental analysis by scanning electron microscopy (SEM) was done before and after the treatment and values were compared with the elemental analysis of material’s core. Samples of the Lusatian Urnfields Culture were successfully treated without any surface damage. The first one of samples of Anabaptist Faience was damaged. The experiment was repeated on the glass to determine the cause. It was find out that damage was probably caused by thermal stress. The second one of Anabaptist Faience was already treated without damage. Next research will be focused on determining specific conditions of the power supply, modification of water solution and modification of sample’s surface for the most efficient ancient ceramics cleaning.
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Determination of climatic factor on the degradation of various solar cells types
Peroutka, Tomáš ; Jandová, Kristýna (referee) ; Vaněk, Jiří (advisor)
In this work are discussed photovoltaic cells. There are also discussed basic concepts of radiation source for solar cells. Also mentioned the issue of semiconductors and even the history and evolution of the solar cells. A large part deals with possibilities of photovoltaic cells degradation. In one chapter is an attempt to bring some types of photovoltaic cells and a description of the production of these modules.The practical part deals with photovoltaic modules degradation and its evaluation. Following part compares measured values with the values provided by producer of photovoltaic modules.
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Evaluation of electrochemical characteristics of AZ61 wrought magnesium alloy
Kotek, Jakub ; Minda, Jozef (referee) ; Fintová, Stanislava (advisor)
This work is focused on evaluation the electrochemical characteristics of AZ61 wrought magnesium alloy. Electrochemical impedance spectroscopy and potentiodynamic tests were used to evaluate the electrochemical characteristic of the alloy. Values of polarization resistance were determined with electrochemical impedance spectroscopy. Values of corrosion potential and corrosion current density were determined with potentiodynamic tests. Sodium chloride solution at a concentration of 0.1 mol·dm-3 was used as a corrosion medium. Outcome of this work is to estimate an influence of fabrication, chemical composition and surface treatment on the corrosion properties of magnesium alloy.
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Biodegradable metal materials for bone tissue prosthetics
Panáková, Olga ; Vondrák, Jiří (referee) ; Sedlaříková, Marie (advisor)
This paper is focused on use of metal materials as a bone replacement. For coherence of this text is necessary theoretical preamble which is consisting of describing metal properties, aimed particularly at corrosion, valuation methods of disposition to corrosion and mainly corrosion itself. This paper also includes description of techniques of preparation, which involves selection of material and its procession. Furthermore there are stated results of experiments. Those are amended with pictures.
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Biodegradable bone implants
Galanová, Zuzana ; Vondrák, Jiří (referee) ; Sedlaříková, Marie (advisor)
This master thesis is focused on producing orthopaedic implant materials and measuring their corrosion properties. It describes the bone and its structure, types, bone ossification and healing. It defines functions of orthopaedic implants and mentions the types of implants – biodegradable and non-biodegradable. The thesis interprets what corrosion is, what categories of corrosion exist and how does the corrosion influence orthopaedic implants. Preparing the solution of stimulated body fluid and manufacturing samples of different metal combinations (of iron, manganese, phosphorus, magnesium, silver and zinc) is included in this thesis, together with corrosion measurements, microscopic observations, EDAX analysis, metallographic analysis, microhardness testing of samples and pH changes measurements of solutions, and the results are interpreted and explained.
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Stainless steel for steam sterilizer components
Hradil, David ; Němec, Karel (referee) ; Pacal, Bohumil (advisor)
The thesis titled "Stainless steel for steam sterilizer components" is focused on the selection of the optimum stainless steel for the device, in our case, pure steam generator. In this thesis are introduced the main mechanisms and types of corrosion. There are divided and characterized by various types of stainless steels. The choice of material is carried out with regard to the working environment and the technological possibilities of the individual types of stainless steels.
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Surface treatments in mechanical engineering
Čudová, Monika ; Kubíček, Jaroslav (referee) ; Žák, Ladislav (advisor)
The project was developed within the bachelor study presents experimental verification of two given varnishes. They are applied on a specially made plate. It was based on literary studies of corrosion coatings issues - coatings and practical tests. The samples were painted and tested according to the standards. The samples were tested on adhesion of varnishes, bending test and salt stray test. Finally all tests were evaluated.
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Manufacture of gastronomic equipment of stainless steel
Macková, Ivana ; Varhaník, Matúš (referee) ; Kalivoda, Milan (advisor)
The bachelor thesis seals with corrosion, stainless steels and surface treatments of steels, which prevent corrosive disruption of the material. Furthermore, the work deals with the design of the production of non-rotating component with a flange made of austenitic stainless steel X5CrNi 18-10. A blank is cut out on sheet shears. A blank is formed into the desire shape on a CYS 320 press by deep drawing technology, and later a flange is cut on LEXN 100 C press. The economic evaluation of production is set at a model situation of 100 000 pcs/year.
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Kinds of materials damage - I
Turková, Veronika ; Bryukhova, Lina (referee) ; Neterda, Zdeněk (advisor)
The material of production units it subsequently damified. The aim of this Bachelor’s Thesis is the description of way of some most frequent material defects in the process industry, the way of their judging by laboratory engines and by theoretical relations for the needed magnitude. This thesis shall show the presentation of material damages via diagram, illustrative photo and drawing. The first part of introduced thesis concerns the hyper cycling fatigue and explains basic characteristics of fatigue and cycle loading. The second part introduces the waste by high temperature flowing. The third part explains the waste by corrosion, which is the well known way of material damage.
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Evaluation of an inspection program and overhauls for ZLIN 26 aircraft
Jančář, Milan ; Finda, Jindřich (referee) ; Augustin, Petr (advisor)
This bachelor´s thesis deals with ZLIN Z 26 Series Aircraft maintenance and repairs procedures. Even the name shows, that this theme is very demanding and extensive. My interest was to explain some maintenance procedures of these aircraft and offer changes of it. In the beginning of this thesis we can briefly learn history of the ZLIN Aircraft and particular Z 226 Series models. There are mentioned difference maintenance procedures, applicable on the planes thru the service life time. Inspection and overhaul procedures are described in details and for better understanding were attached drawings or photos. Following chapter deals with evaluation existing inspections and overhauls - maintenance – procedures. Optimization of the maintenance is part of the chapter fourth, where is described possible innovation of the maintenance check list. In the last, fifth chapter, of this thesis are mentioned possibilities of the ZLIN Aircraft life time prolongation, which is actually discussed because of some aircraft of this type series reached basic life time limit, without any serious fatigue airframe damages appears.
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