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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Oxidation behavior adjustment for TiAl intermetallics by Al-Y multilayers
 Handrk, Jiří ; Tkachenko, Serhii (oponent) ; Jan, Vít (vedoucí práce)
Mechanical properties of titanium aluminide Ti-46Al-7Nb-0.7Cr-0.1Si-0.2Ni are constant above 700°C. Alloy oxidize above this temperature. Aim of this thesis is to verify a possibility to influences the oxidation properties of intermetallic TiAl based by metal multilayer from Y and Al. Layers The coating was done by PVD technique. Samples were coated by pure yttrium or combination yttrium and aluminium. Samples were annealed at 700°C and 900°C for annealing temperature influence. Quality of layers were investigated by scratch test, EDS analysis. Samples were oxidized isothermally at 900°C for 100hrs. After oxidation all samples were subjected oxide surface evaluation, fracture bending tests after which fracture surface and adherence of the oxide scale were evaluated. The chemical composition of oxide scales was measured using EDS on metallographic specimen. Any layers with or without annealing not shown positive oxidation properties. Higher temperature of annealing shown better adhesity but worst three point bend test results.
Úplný záznam
Oxidation behavior adjustment for TiAl intermetallics by Al-Y multilayers
 Handrk, Jiří ; Tkachenko, Serhii (oponent) ; Jan, Vít (vedoucí práce)
Mechanical properties of titanium aluminide Ti-46Al-7Nb-0.7Cr-0.1Si-0.2Ni are constant above 700°C. Alloy oxidize above this temperature. Aim of this thesis is to verify a possibility to influences the oxidation properties of intermetallic TiAl based by metal multilayer from Y and Al. Layers The coating was done by PVD technique. Samples were coated by pure yttrium or combination yttrium and aluminium. Samples were annealed at 700°C and 900°C for annealing temperature influence. Quality of layers were investigated by scratch test, EDS analysis. Samples were oxidized isothermally at 900°C for 100hrs. After oxidation all samples were subjected oxide surface evaluation, fracture bending tests after which fracture surface and adherence of the oxide scale were evaluated. The chemical composition of oxide scales was measured using EDS on metallographic specimen. Any layers with or without annealing not shown positive oxidation properties. Higher temperature of annealing shown better adhesity but worst three point bend test results.
Úplný záznam

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