Influence of Additive Type on Densification and Phase Transformation of Seeded Si3N4

Abstract:

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This paper deals with densification and a®b phase transformation of Si3N4, with a constant b-Si3N4 seeds concentration regarding sintering temperature and different additive types. The seeds of b-Si3N4 were obtained by sintering of silicon nitride in a-form and additive mixture consisting of Y2O3 and SiO2. Two different Si3N4/additive mixtures (Y2O3 + Al2O3 and CeO2) containing constant amount of seeds were prepared and tested. Characterization of sintered samples involved phase analysis by X−ray diffraction and density measurements. The results indicated that in the presence of yttria-alumina mixture both the phase transformation and the densification were enhanced as compared to samples containing only CeO2 as a sintering additive. The reasons for observed behavior are discussed in detail.

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Periodical:

Edited by:

Dragan P. Uskokovic, Slobodan K. Milonjic, Djan I. Rakovic

Pages:

429-434

DOI:

10.4028/www.scientific.net/MSF.494.429

Citation:

A. Vučković et al., "Influence of Additive Type on Densification and Phase Transformation of Seeded Si3N4", Materials Science Forum, Vol. 494, pp. 429-434, 2005

Online since:

September 2005

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$35.00

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