Early-stage thermal oxidation of carbothermal β-sialon powder

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

研究成果: Article査読

21 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)266-268
ページ数3
ジャーナルJournal of the American Ceramic Society
81
1
DOI
出版ステータスPublished - 1998 1
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 材料化学

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