Early-stage thermal oxidation of carbothermal β-sialon powder

Shiro Shimada, Takenori Aoki, Hajime Kiyono, Kenneth J.D. MacKenzie

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Early-stage thermal oxidation (below 1100°C) of carbothermally synthesized β-sialon powder was monitored by X-ray powder diffraction, solid-state 29Si and 27Al MAS NMR spectroscopy, and thermogravimetry. No crystalline oxidation products were detected by XRD but 29Si and 27Al MAS NMR indicated the early formation of amorphous silica, followed by the formation of an amorphous aluminosilicate with an atomic environment similar to that of mullite. The initial oxidation was described by a linear kinetic law with an activation energy of 170 kj·mol-1, suggesting the rate-limiting step to be due to dissolution of O2 in an amorphous silica surface layer on the β-sialon particles.

Original languageEnglish
Pages (from-to)266-268
Number of pages3
JournalJournal of the American Ceramic Society
Volume81
Issue number1
DOIs
Publication statusPublished - 1998 Jan

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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