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Formation of Diffusion Barriers Using Chemical Vapour Deposition Process
Foltýnek, Jaroslav ; Němec, Karel (referee) ; Čelko, Ladislav (advisor)
Masters thesis deals with formation of diffusion barrier coatings by means of powder mixtures chemical vapor deposition. Its theoretical part is focused on the problems with diffusion barriers formation, where predominantly three most commonly used methods are introduced, i.e. CVD from powder mixtures, active gasses and slurries. The experimental part of master thesis deals with the formation of nickel-aluminide diffusion barriers on Inconel 713LC superalloy substrate, where was for aluminization used six different powder mixtures at the temperature of 800 °C and dwell of 0, 2 and 5 hours.
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Fatigue failure mechanism of nickel-based superalloy Inconel 713LC under 800°C
Smékalová, Jana ; Juliš, Martin (referee) ; Hutařová, Simona (advisor)
Nickel superalloys are used for high-temperature application in energetic and aerospace industry. They are exposed to aggressive environment at high temperatures with the interactions between fatigue and creep processes, high-temperature oxidation, corrosion and erosion. Lifetime extension of such strained parts while increasing the performance of particular machine is possible by applying protective surface coatings. The subject of this work is to investigate the fatigue failure mechanisms of superalloy Inconel 713LC at 800 °C and to compare these mechanisms between material with a protective coating based on Al-Si and material without coating. The location of initiation fatigue cracks, their propagation and the fatigue crack propagation rate in some areas were analyzed by optical microscopy, scanning electron microscopy and confocal laser scanning microscopy. Based on previous research it was found that the application of the coating AlSi has a positive effect on lifetime of alloy Inconel 713LC. These results were confirmed and estimated in the diploma thesis.
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Study of AlSi protective coating after degradation
Vítková, Gabriela ; Řičánková, Veronika (referee) ; Hutařová, Simona (advisor)
Materials used for high temperature applications works in a very aggressive environment (oxidation, hot corrosion, erosion, fatigue, creep). Demands on these materials are very high. Nickel-based superalloys show the certain stability in this environment. Improved resistance to oxidation and hot corrosion can be achieved by using protective layers such as diffusion barriers. This thesis is focused on changes of microstructure and properties of AlSi layer applied by „slurry“ method on nickel-based superalloy Inconel 713 LC, due to long-term thermal exposition at 800, 900 a 1000 °C.
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Influence of Al and AlSi Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C
Šulák, Ivo ; Juliš, Martin (referee) ; Podrábský, Tomáš (advisor)
Nickel based superalloys are mainly used for high-temperature applications in energetic and aerospace industry. They are exposed to extremely aggressive environment at high temperature with interaction between fatigue and creep processes, oxidation and erosion. Application of protective surface coating is the right way how to increase the lifetime while increasing performance of machine. Theme of this bachelor’s thesis is to investigate the fatigue parameters of superalloy In713LC at 800 °C and the comparison of these parameters between materials with a protective coating based on Al or Al-Si and material without coating.
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Relationship between Structure and Properties of cast Ni-alloys
Smékalová, Jana ; Hutařová, Simona (referee) ; Podrábský, Tomáš (advisor)
Nickel superalloys are developed for conditions which request the corrosion resistance, the heat-resisting and the creep-resisting material. They are used for components of air turbine motors and internal combustion turbines. The efficiency of these mechanisms is elevated with increasing combustion temperature so their development is accentuated. This thesis is concerned with a relationship between a structure and properties of nickel superalloys Inconel 713LC and Inconel 738LC in this thesis.
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Vysokocyklová únava IN 713LC
Kunz, Ludvík ; Lukáš, Petr ; Mintách, Rastislav ; Konečná, R.
High-cycle fatigue strength of Ni-base superalloy IN 713LC was experimentally determined for symmetrical loading and for loading with tensile mean stresses at a temperature of 800 °C in air. An analysis of the influence of microstructure on fatigue crack initiation and related fatigue strength was performed. Statistical method of the largest extreme value has been applied to characterize the casting defect distribution.
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