Dry and wet oxidation of Y-α-SiAlON powder at 1000°-1300°C

H. Kiyono, T. Aketo, H. Watanuki, S. Shimada

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Oxidation of Y-α-sialon powder was investigated in and Ar/O2 (dry) and Ar/O2/H2O (wet) atmospheres at the temperature range 1000° ∼ 1300°C. Oxidation products were identified by X-ray powder diffraction, 29Si magic angle spinning nuclear magnetic resonance and transmission electron microscope. The weight change by isothermal oxidation was followed by thermogravimetry. Oxidation product was composed of mullite, y-Y2Si2O7 and amorphous SiO2 in both atmospheres. Amorphous SiO2 is crystallized to cristobalite at 1300°C in the wet atmosphere. The weight changes were represented by the first order reaction equation. The rate constants for oxidation were greater 4 ∼ 10 times in the wet atmosphere than in the dry atmosphere.

Original languageEnglish
Pages (from-to)227-232
Number of pages6
JournalKey Engineering Materials
Volume237
DOIs
Publication statusPublished - 2003 Jan 1
EventProceedings of the International Symposium on SiAlONs - Chiba, Japan
Duration: 2001 Dec 22001 Dec 4

Keywords

  • Nucleation Limiting-Rate
  • Oxidation
  • Powder
  • Water Vapor
  • Y-α-SiAlON

ASJC Scopus subject areas

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

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