Thermodynamics Analysis on Combustion Synthesis of β-SiAlON

Xue Mei Yi; Jing Niu; Tomohiro Akiyama

doi:10.4028/www.scientific.net/MSF.787.383

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HomeMaterials Science ForumMaterials Science Forum Vol. 787Thermodynamics Analysis on Combustion Synthesis of...

Thermodynamics Analysis on Combustion Synthesis of β-SiAlON

Abstract:

Combustion synthesis (CS) of β-SiAlON (z = 1) was carried by heating the raw mixtures of Si, Al, and SiO₂ under a constant nitrogen pressure of 1 MPa to the preconcerted temperature. The temperature profile was recorded by a W-Re thermocouple, which showed several exothermic and endothermic reactions during the entire CS process. The maximum temperature reached above 1900°C, and two main exothermic reactions at ~800 °C and ~1350 °C were found. The XRD analyses indicated that the main intermediate products are AlN, SiO₂, and Al₂O₃ before β-SiAlON was synthesized finally. From our analyses, Al reacted with nitrogen gas at ~800 °C first, then at ~1350 °C, the main reaction occurred and the final product was obtained synchronously.

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Materials Science Forum (Volume 787)

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383-386

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https://doi.org/10.4028/www.scientific.net/MSF.787.383

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Online since:

April 2014

Authors:

Xue Mei Yi*, Jing Niu, Tomohiro Akiyama

Keywords:

Combustion Synthesis, Thermodynamic, X-Ray Diffraction (XRD), Β-Sialon

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