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Kinetic studies of oxidation of MgAlON and a comparison of the oxidation behaviour of AlON, MgAlON, O'SiAlON-ZrO2, and BN-ZCM ceramics
KTH, Superseded Departments, Materials Science and Engineering.
2002 (English)In: Zeitschrift für Metallkunde, ISSN 0044-3093, Vol. 93, no 6, 545-553 p.Article in journal (Refereed) Published
Abstract [en]

The kinetics and morphology of the oxidation process of magnesium-aluminium oxynitride (MgAlON), aluminium oxynitride (AlON), O'SiAlON-ZrO2, and BN-ZCM have been studied in the temperature range 1373-1773 K. Oxidation experiments with powder and plate samples of the above materials have been carried out in air. MgAlON shows the best resistance to oxidation at lower temperatures (<1473 K), whereas at higher temperatures (similar to773 K), AlON shows the best resistance. O'SiAlON-ZrO2 shows very good oxidation resistance up to 1673 K. But its oxidation rate increases strongly above 1673 K, presumably due to the formation of liquid phase. BN-ZCM has the poorest oxidation resistance due to the evaporation of B2O3. The activation energies for the chemical oxidation reaction of AlON, MgAlON, and O'SiAlON-ZrO2 are 214, 330 and 260 kJ/mol, respectively. The overall diffusion activation energies for AlON, MgAlON, O'SiAlON-ZrO2 and BN-ZCM are 227, 573, 367 and 289 kJ/mol, respectively.

Place, publisher, year, edition, pages
2002. Vol. 93, no 6, 545-553 p.
Keyword [en]
oxidation, MgAlON, kinetics, morphology
URN: urn:nbn:se:kth:diva-21738ISI: 000177002000009OAI: diva2:340436
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Seetharaman, Seshadri
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