Oxidation of boron carbide-silicon carbide composite at 1073 to 1773 K

Takayuki Narushima, Takashi Goto, Makoto Maruyama, Haruo Arashi, Yasutaka Iguchi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The oxidation behavior of B4C-(25-60 mol%)SiC composites prepared by arc-melting was investigated in the temperature range of 1073 to 1773 K using a thermogravimetric technique. Liquid borosilicate, solid SiO2 and carbon were identified as oxidation products by X-ray diffraction and Raman spectroscopy. Mass gain was observed during oxidation at 1073 K, while mass loss due to the vaporization of boron oxide in liquid borosilicate was observed at temperatures of 1273 K and higher. In situ Raman spectra of the surface of B4C-SiC composites indicated that the silica concentration in the liquid borosilicate increased with increasing SiC content in the composite. Micro-Raman spectroscopy showed that carbon was enriched in the borosilicate layer close to the oxide/composite interface. The parabolic rate constants for B4C-50 mol%SiC composites at 1073 K were proportional to ambient oxygen partial pressures ranging between 30 and 100 kPa. The diffusion of oxygen molecules through the liquid borosilicate layer could be the rate-controlling process. The increase of SiC content in the B4C-SiC composites improved the oxidation resistance in both the mass gain and mass loss regions.

Original languageEnglish
Pages (from-to)401-406
Number of pages6
JournalMaterials Transactions
Volume44
Issue number3
DOIs
Publication statusPublished - 2003 Mar

Keywords

  • Boron carbide
  • Boron oxide
  • Carbon
  • Kinetics
  • Oxidation
  • Raman spectroscopy
  • Silica
  • Silicon carbide

ASJC Scopus subject areas

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

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