Effect of heat generation on the development of vermicular α-Al2O3 in alumina films

R. B. Bagwell, G. L. Messing

Research output: Contribution to journalConference articlepeer-review

Abstract

The transformation of transition aluminas (i.e. θ-Al2O3) to α-Al2O3 results in an interconnected, porous microstructure that is commonly described as 'wormy' or 'vermicular'. The effect of heat generated during the exothermic transformation at the θ-Al2O3/α-Al2O3 interface on the development of the vermicular α-Al2O3 morphology was analyzed in boehmite-derived thin films. The vermicular structure may arise in an analogous manner to the thermal dendrites formed in metals during solidification. However, the analysis shows that heat generation and transfer at the interface does not play a significant role in the development of α-Al2O3 dendrites.

Original languageEnglish (US)
Pages (from-to)133-137
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
Volume432
StatePublished - 1997
EventProceedings of the 1996 MRS Spring Meeting - San Francisco, CA, USA
Duration: Apr 8 1996Apr 12 1996

All Science Journal Classification (ASJC) codes

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

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