0000000000205441

AUTHOR

Kazimierz Przybylski

showing 4 related works from this author

Role of Minor Element Addition in the Formation of Thermally Grown Alumina Scales

2004

Materials scienceMinor elementChemical engineeringMechanics of MaterialsMechanical EngineeringAnalytical chemistryGeneral Materials ScienceCondensed Matter PhysicsMaterials Science Forum
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The Role of Zr in the High-Temperature Oxidation of Fe<sub>3</sub>Al

2008

The paper describes an examination of the effect of the addition of zirconium as a third element on the heat-resisting properties and explains the high temperature oxidation mechanism of Fe3Al intermetallic compounds. The Fe3Al and Fe3Al-0,05Zr specimens have been isothermally oxidized in the temperature range of 1173-1473 K in synthetic air for 100 hrs. The formed oxide layer, about 1,5-2 μm thick, was Al2O3. An examination of the cross-sectioned scales by SEM-EDS showed that the alumina layer consisted of a small inner columnar layer and an outer equiaxed grain layer. Additionally, very fine (50-150 nm) oxide grains rich in Zr, further identified as ZrO2, were found across the alumina sca…

Equiaxed crystalsZirconiumMaterials scienceMechanical EngineeringMetallurgyOxideIntermetallicchemistry.chemical_elementAtmospheric temperature rangeCondensed Matter PhysicsFocused ion beamchemistry.chemical_compoundchemistryChemical engineeringMechanics of MaterialsGeneral Materials ScienceGrain boundaryLayer (electronics)Materials Science Forum
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Water vapor effect on high-temperature oxidation behavior of Fe3Al intermetallics

2009

Fe3Al intermetallics (Fe3Al, Fe3Al-Zr, Fe3Al-Zr,Mo and Fe3Al-Zr, Mo, Nb) were oxidized at 950 °C in dry and humid (11 vol% water) synthetic air. Thermogravimetric measurements showed that the oxidation rates of the tested intermetallics were lower in humid air than in dry air (especially for Fe3Al-Zr, Mo and Fe3Al-Zr, Mo, Nb). The addition of small amounts of Zr, Mo or Nb improved the kinetics compared with that of the undoped Fe3Al. Fe3Al showed massive spallation, whereas Fe3Al-Zr, Fe3Al-Zr, Mo and Fe3Al-Zr, Mo, Nb produced a flat, adherent oxide layer. The rapid transformation of transient alumina into alpha alumina may explain the decrease in the oxidation rate in humid air.

Thermogravimetric analysisMaterials scienceMetallurgyKineticsOxideAnalytical chemistryIntermetallicchemistry.chemical_compoundchemistryGeneral Materials ScienceSpallationLayer (electronics)Water vaporOxidation rateScience and Technology of Advanced Materials
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High Temperature Oxidation of TiAl and TiAl8Nb Alloys in Air

2011

Isothermal oxidation of two g-TiAl-based intermetallic alloys: Ti48Al and Ti46Al8Nb alloys was studied in synthetic air at 1073-1223 K for up to 240 hrs. Mass change per unit area for the oxidized samples followed approximately the parabolic rate law. The kp values for the studied temperature interval were in the range from 7.2×10-13 to 1.8×10-11 g2cm-4s-1. The activation energy for oxidation of Ti48Al alloy in air at 1073-1223 K was Ea = 165±12 kJ/mol. Niobium addition to Ti48Al alloy in the amount of 8% increased its oxidation resistance. Structure and chemical composition of the oxidation products, and morphology of the oxidized samples were investigated using XRD, SEM-EDS, and TEM. The …

Materials scienceMechanical EngineeringAlloyNiobiumIntermetallicOxideAnalytical chemistrychemistry.chemical_elementActivation energyengineering.materialCondensed Matter PhysicsIsothermal processMetalchemistry.chemical_compoundchemistryMechanics of Materialsvisual_artvisual_art.visual_art_mediumengineeringGeneral Materials ScienceTinMaterials Science Forum
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