Preparation of Sialon/Si3N4-SiC Composite Refractories Using Kyanite Tailings

Ming Hao Fang; Zhao Hui Huang; Yan Gai Liu; Xin Min; Li Na Zhang

doi:10.4028/www.scientific.net/KEM.697.467

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 697Preparation of Sialon/Si3N4-SiC Composite...

Preparation of Sialon/Si₃N₄-SiC Composite Refractories Using Kyanite Tailings

Abstract:

Sialon-SiC composite powders were synthesized from kyanite tailings through the carbothermal reduction nitridation (CRN) technique. Using Sialon-SiC composites to substitute Si₃N₄ composites via the CRN technique synthesize Sialon/Si₃N₄-SiC composite refractories. The phase composition, cross section morphology, and the substituent amount of Sialon-SiC composites impact on refractories mechanical properties were investigated, respectively. The optimized synthesis temperature for the CRN reaction was found to be 1550 °C for 4 h with the excess carbon 20%. The substituent amount of Sialon-SiC was 25%, the mechanical properties of Sialon/Si₃N₄-SiC composite refractories reached optimal performance, which bending strength value was 41.8 MPa and compression strength value was 61.6 MPa.

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Periodical:

Key Engineering Materials (Volume 697)

Pages:

467-471

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.697.467

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Online since:

July 2016

Authors:

Ming Hao Fang*, Zhao Hui Huang, Yan Gai Liu, Xin Min, Li Na Zhang

Keywords:

Carbothermal Reduction Nitridation, Kyanite Tailings, Refractories, Sialon/ Si₃N₄-SiC

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