Oxidation of monolithic TiB2 and of Al2O3-TiB2 composite

Anna Tampieri, A. Bellosi

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

In view of the susceptibility of TiB2 to oxidation, the thermal stability of monolithic TiB2 and Al2O3-TiB2 composite was investigated. The temperature at which TiB2 ceramic starts to oxidize is about 400°C, oxidation kinetic being controlled by diffusion up to T≈900°C and in the first stage of the oxidation at 1000 and 1100°C (up to 800 and 500 min, respectively), and by a linear law at higher temperatures and longer periods. Weight gains of Al2O3-TiB2 composite can be detected only at temperatures above ≈700°C and the rate-governing step of the oxidation reaction is characterized by a one-dimensional diffusion mechanism at T=700 and 800°C and by two-dimensional diffusion at higher temperatures. The composition and morphology of the oxidized surfaces were analysed.

Original languageEnglish (US)
Pages (from-to)649-653
Number of pages5
JournalJournal of Materials Science
Volume28
Issue number3
DOIs
StatePublished - Feb 1 1993

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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