Preparation of Ca-α-Sialon-SiC Multiphase Ceramics from Gasification Slag

Hong Feng Yin; Yun Tang

doi:10.4028/www.scientific.net/MSF.695.328

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HomeMaterials Science ForumMaterials Science Forum Vol. 695Preparation of Ca-α-Sialon-SiC Multiphase Ceramics...

Preparation of Ca-α-Sialon-SiC Multiphase Ceramics from Gasification Slag

Abstract:

The chemical composition, phase constituents and microstructure of gasification slag from Texaco gasifier, the carbothermal reduction nitridation of gasification slag were investigated by X-ray fluorescence spectrometry, X-ray diffractometry and scanning electron microscopy. The effect of nitridation temperature on the phase composition and morphology of nitridation reaction products was studied. Ca-α-sialon—SiC multiphase ceramics were fabricated and characterized. The results showed that: The coal gasification slag was an ideal raw material to synthesize Sialon powder. When introducing 3wt%Y₂O₃+2wt% MgO into sialon powder carbothermally synthesized at 1450°C, the Vickers hardness and fracture toughness of Sialon-SiC multiphase ceramics hot-pressed at 1650 °C were 18.6 GPa and 5.2 MPa·m^1/2, respectively.

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Periodical:

Materials Science Forum (Volume 695)

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328-331

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.695.328

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Online since:

July 2011

Authors:

Hong Feng Yin, Yun Tang

Keywords:

Carbothermal Reduction Nitridation, Gasification Slag, Mechanical Property, SiAlON

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