Thermal oxidation of sintered beta-sialon (z=3) ceramics in atmospheres with water vapor

H. Kiyono, S. Shimada

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

Thermal oxidation of β-sialon (Si6-zAlzO zN8-z, z = 3) ceramic was investigated at 1300 to 1600°C in dry (Ar/O2= 90/10 kPa), wet O2 (Ar/O 2/H2O = 80/10/10 kPa) and wet (Ar/H2O = 90/10 kPa) atmospheres. Oxidation was followed from weight gains using thermogravimetry and the oxidized sample was characterized by scanning electron microscope, electron probe microanalysis and X-ray powder diffraction. Oxidation kinetics in the three atmospheres were represented by a parabolic rate model except for at 1600°C. The wet and wet O2 oxidation rates were greater than the dry oxidation, the degree decreasing with rising temperature from 1300 to 1500°C, while wet and wet O2 oxidation at 1600°C was even faster again than the dry oxidation. It was found that the scale formed by the dry, wet and wet O2 oxidation consisted of mullite and cristobalite at 1300-1500°C and of mullite and SiO2 rich aluminosilicate glass at 1600°C.

Original languageEnglish
Pages (from-to)893-896
Number of pages4
JournalKey Engineering Materials
Volume264-268
Issue numberII
Publication statusPublished - 2004 Nov 26
EventProceedings of the 8th Conference and Exhibition of the European Ceramic Society - Istanbul, Turkey
Duration: 2003 Jun 292003 Jul 3

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Keywords

  • Aluminosilicate glass
  • Beta-sialon
  • Diffusion limiting rate
  • Oxidation
  • Water vapor

ASJC Scopus subject areas

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

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