Oxidation behavior of aluminum nitride

A. Bellosi, E. Landi, A. Tamnieri

Research output: Contribution to journalArticle

70 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)565-572
Number of pages8
JournalJournal of Materials Research
Volume8
Issue number3
DOIs
StatePublished - Mar 1993

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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