Influence of Sintering Temperature and Atmosphere on Phase Makeup of SiAlON-Graphite Composites

Wen Wu Wang; Hui Yan Cao; Jin Xiang Wang; Zhi Ping Zhang

doi:10.4028/www.scientific.net/AMR.535-537.169

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 535-537Influence of Sintering Temperature and Atmosphere...

Influence of Sintering Temperature and Atmosphere on Phase Makeup of SiAlON-Graphite Composites

Abstract:

Based on aluminum powder, Silicon powder, activated alumina and flake graphite as the main starting materials, SiAlON-Graphite composites were produced in N₂ atmosphere. The influence of firing temperature and atmosphere on Si-Al-O-C-N system was investigated. It is proposed that the introduction of graphite produces a certain CO partial pressure and affects the nitridation of metal silicon, therefore reducing the mass change. In addition, large amount of 15R are formed through carbothermic reduction. CO hinders the growth of β-SiAlON. Z value of β-SiAlON in sample C with graphite is less than sample S without graphite.

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Periodical:

Advanced Materials Research (Volumes 535-537)

Pages:

169-173

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.535-537.169

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Online since:

June 2012

Authors:

Wen Wu Wang, Hui Yan Cao, Jin Xiang Wang, Zhi Ping Zhang

Keywords:

Carbothermic Reduction, Nitridation, Si-Al-O-C-N System, Sialon-Graphite Composites

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