High-Temperatures Oxidation of AlN–TiCrB2 Composites. I. Kinetics and Mechanism of Air Oxidation Up to 1600°C
| Autor: | A. P. Umanskii, V. P. Konoval, Vladimir A. Lavrenko, Alla D. Panasyuk |
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| Rok vydání: | 2015 |
| Předmět: |
Arrhenius equation
Materials science Kinetics Composite number Inorganic chemistry Metals and Alloys Oxide chemistry.chemical_element Activation energy Condensed Matter Physics Oxygen chemistry.chemical_compound symbols.namesake chemistry Chemical engineering Mechanics of Materials Differential thermal analysis Thermal Materials Chemistry Ceramics and Composites symbols |
| Zdroj: | Powder Metallurgy and Metal Ceramics. 54:482-489 |
| ISSN: | 1573-9066 1068-1302 |
| DOI: | 10.1007/s11106-015-9739-y |
| Popis: | Thermal gravimetry and differential thermal analysis are employed to study the oxidation resistance of AlN–TiCrB2 materials in air up to 1600°C. The kinetic curves for the materials are parabolic, indicating that oxidation leads to the formation of dense oxide layers preventing oxygen diffusion deep into the samples. With increasing TiCrB2 content of the composite, its oxidation resistance decreases since B2O3 appears in and evaporates from the oxide film, resulting in its partial failure. The oxidation rate constants and activation energies are calculated for different temperature ranges with the Arrhenius equation based on collisions of oxygen molecules on the samples. The data obtained indicate that the oxidation mechanism is dependent on the material composition and temperature. |
| Databáze: | OpenAIRE |
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