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Oxidation behavior of aluminum nitride

Published online by Cambridge University Press:  31 January 2011

A. Bellosi ,
E. Landi  and
A. Tampieri
A. Bellosi
Affiliation:
CNR-IRTEC, Research Institute for Ceramics Technology, Faenza, Italy
E. Landi
Affiliation:
CNR-IRTEC, Research Institute for Ceramics Technology, Faenza, Italy
A. Tampieri
Affiliation:
CNR-IRTEC, Research Institute for Ceramics Technology, Faenza, Italy
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Abstract

The evaluation of the thermal stability of three different fully dense AlN materials in the temperature range of 600 °C to 1400 °C in air indicates the strong effect of the starting composition on the oxidation process. The oxidation resistance of pure AlN and Y2O3-doped AlN was found to be good up to ≍1350 °C. The kinetics are linear (1100 ≤ T ≤ 1400 °C) and the process is governed by a surface reaction that gives rise to the formation of a porous, nonprotective oxide scale, where Al2O3 and Y-aluminates (i.e., AlN–Y2O3) have been found as crystalline reaction products. For AlN-CaC2, higher oxidation rates indicate that the outward migration of Ca modifies the reaction mechanisms. Linear kinetics in the range 1100 ≤ T ≤ 1200 °C are followed by parabolic kinetics at higher temperatures (T > 1250 °C); with regard to the latter behavior, an activation energy of 160 kJ/mole could indicate the diffusion of oxygen through the oxidation scale as the rate-controlling mechanism.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 3 , March 1993 , pp. 565 - 572
Copyright
Copyright © Materials Research Society 1993

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References

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