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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 12/2016

12-10-2016

Spark Plasma Sintering of α/β Si3N4 Ceramics with MgO-Al2O3 and MgO-Y2O3 as Sintering Additives

Authors: F. L. Yu, Y. Bai, P. D. Han, Q. L. Shi, S. Ni, J. H. Wu

Published in: Journal of Materials Engineering and Performance | Issue 12/2016

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Abstract

In the present work, the α/β Si3N4 ceramics were fabricated by spark plasma sintering (SPS) at 1400-1500 °C for 6 min with 3wt.%MgO + 5wt.%Al2O3 and 3wt.%MgO + 5wt.%Y2O3 as sintering additives. The results showed that the phase composition, microstructure and mechanical properties of α/β Si3N4 ceramics were highly dependent on the type of sintering additive. The incomplete phase transformation from α to β occurred in the presence of an oxynitride (Mg-Al(Y)-Si-O-N) liquid phase. Compared with MgO-Al2O3, MgO-Y2O3 can significantly improve the β conversion rate of as-sintered α/β Si3N4 ceramics. And the as-sintered ceramics using MgO + Al2O3 as sintering additives had higher mechanical properties.
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Metadata
Title
Spark Plasma Sintering of α/β Si3N4 Ceramics with MgO-Al2O3 and MgO-Y2O3 as Sintering Additives
Authors
F. L. Yu
Y. Bai
P. D. Han
Q. L. Shi
S. Ni
J. H. Wu
Publication date
12-10-2016
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 12/2016
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-016-2372-1

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