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Microstructure and Strength of Oxidation-Bonded Porous Silicon Nitride Ceramics

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Abstract:

An oxidation bonding process was developed to fabricate oxidation-bonded porous silicon nitride (Si3N4) ceramics from α-Si3N4 powder in air at 1100-1400oC. Si3N4 particles are bonded by the oxidation-derived silica (SiO2) and the pores derive from the stack of Si3N4 particles and the release of N2 and SiO gas during the sintering. The microstructure of oxidation-bonded porous Si3N4 ceramics was observed. Moreover, the fracture mechanism was analyzed. Effects of the bonding phases and pores on the flexural strength were investigated. Oxidation-bonded porous Si3N4 ceramics with high flexural strength was obtained by restraining the crystallization of amorphous silica and forming the well-developed necks between Si3N4 particles.

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Periodical:

Key Engineering Materials (Volumes 353-358)

Pages:

503-506

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.503

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Online since:

September 2007

Authors:

Shu Qiang Ding, Yu Ping Zeng, Dong Liang Jiang

Keywords:

Microstructure, Porous Ceramics, SiO2, Strength

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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