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Study on Microstructure and Mechanical Properties of Porous Si3N4 Ceramics

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Abstract:

Porous Si3N4 ceramics were fabricated by using different species β-Si3N4 as seeds, 5 wt.% Y2O3 and Lu2O3 as sintering additives. Effects of three types of β-Si3N4 seeds and two types of sintering additives on the microstructure and mechanical properties of porous Si3N4 ceramics were investigated. The results showed rod-like β-Si3N4 grains with finer and high aspect ratio developed in the porous microstructure. The microstructure and mechanical properties of specimens added with Lu2O3 and β-Si3N4 seeds were better than which of those added with Y2O3 and β-Si3N4 powder. The flexural strength and average aspect ratio of porous Si3N4 ceramics were in the range of 297349 MPa and 5.757.26 with the porosity range of 41.07%44.40%.

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Eco-Materials Processing and Design XIII View Preview

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Periodical:

Materials Science Forum (Volume 724)

Pages:

241-244

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.724.241

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Online since:

June 2012

Authors:

Fang Li Yu, Yu Bai, Jun Du, Ping Ping Yu, Jian Zhi Wang, Jian Feng Yang

Keywords:

Mechanical Property, Microstructure, Seeds, Sintering Additives, Study

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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