Preparation and Microstructure of Pressureless Sintered Si₂ON₂-SiC Ceramic

Abstract:

This paper introduces Si₂ON₂-SiC ceramic fabricated by pressureless sintering method and studies the effect of additives, nitriding temperatures on bulk density, porosity, phase composition and microstructure. It is discovered that additives MgO, CeO₂ can increase the densities of Si₂ON₂-SiC ceramic apparently, and MgO additive has a better effect than CeO₂. Nitriding temperature also is an important factor. The bulk density of the specimen with MgO additive reaches maximum at 1.91 g/cm³ when sintered at 1450 °C, and the bulk density of specimen with CeO₂ additive is 1.86 g/cm³ at the same condition while the bulk density of the specimen without additive is only 1.75 g/c^{Superscript text}m3. The X-ray diffraction and scanning electron microscopy of the specimens show that the amount of Si₂ON₂ increase with the sintering temperature increase. But when the temperature is higher than 1500 °C the Si₂ON₂ grains will decompose into Si₃N₄, and Si₂ON₂ will vanish at 1550 °C

• Periodical: Advanced Materials Research (Volumes 335-336)
• Pages: 699-703
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.335-336.699
• Online since: September 2011
• Authors: Hui Hui Tan, Zhu Xing Tang, Xia Zhao, He Zhang
• Keywords: Microstructure, Preparation, Pressureless Sintering, Si₂N₂O-sic Ceramic

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