Early-Stage Thermal Oxidation of Carbothermal β-Sialon Powder

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 e...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1998-01, Vol.81 (1), p.266-268
Main Authors: Shimada, Shiro, Aoki, Takenori, Kiyono, Hajime, MacKenzie, Kenneth J. D.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
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Summary: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 kJmol−1, suggesting the rate‐limiting step to be due to dissolution of O2 in an amorphous silica surface layer on the β‐sialon particles.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1998.tb02331.x