Surface oxidation of Si3N4 green compacts : Effect of sintering aids

Changes in the particle surface of Si3N4 green compacts prepared by different forming procedures (slip casting and isostatic pressing), with and without sintering aids (Al2O3 and Y2O3), were investigated. The surface oxidation was examined by investigating the contribution made by the processing par...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 1997, Vol.17 (2-3), p.383-391
Main Authors: CASTANHO, S. M, FIERRO, J. L. G, MORENO, R
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
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Summary:Changes in the particle surface of Si3N4 green compacts prepared by different forming procedures (slip casting and isostatic pressing), with and without sintering aids (Al2O3 and Y2O3), were investigated. The surface oxidation was examined by investigating the contribution made by the processing parameters and the sintering aids. XPS is an extremely useful technique for this purpose. High resolution XPS was applied to reveal not only the chemical changes brought about by oxidation of Si3N4 green compacts but also to quantify the extent of surface oxidation. 13 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/s0955-2219(96)00140-9