[Kovove materialy - Metallic materials]
    Thu - March 28, 2024 - 21:34 No. of hits : 1736490 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 33 (1995), Issue 6

Microstructural behaviour of Si3N4 ceramics during creep (in Slovak)
HVIZDOS, P., LOFAJ, F., DUSZA, J.
vol. 33 (1995), no. 6, pp. 473 - 483

Abstract
TEM and HREM investigations were performed on two types of silicon nitride ceramics: A - GPS Si3N4 + 9 wt.% Y2O3 + 1 wt.% Al2O3 in which the intergranular phase was present in thick layers; and B - HP Si3N4 + 5 wt.% Yb2O3, with very thin layers of the glassy phase (< 10 nm). The results were related to those obtained from the creep tests and the high temperature deformation mechanisms were identified. In the case of the first material an intensive cavitation causing a low creep resistance took place, while for the high creep resistance of the second material the mechanisms of diffusion were probably decisive.

Key words
TEM and HREM investigations, silicon nitride ceramics, microstructural behaviour

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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