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Problems and prospects of Si3N4 materials for applications at temperatures above 1400 deg C

 
: Klemm, H.; Herrmann, M.; Schubert, C.; Hermel, W.

High temperatures, high pressures 28/29 (1996), Nr.4, S.449-456
ISSN: 0018-1544
Englisch
Zeitschriftenaufsatz
Fraunhofer IKTS ()
creep; oxidation resistance; silicon nitride; silicon nitride based composite; silicon oxinitride; slow crack growth; time to failure

Abstract
Based on the understanding of the limiting mechanisms during service in structural applications at elevated temperatures, the potential of silicon nitride materials up to temperatures of 1500 deg C is discussed. It is possible to improve the mechanical properties significantly by microstructural tailoring of the Si3N4-material. The three examples described in this study, which are the optimization of the grain boundary phase composition, the tailoring of microstructure and grain boundary in Si3N4-SiC-nanocomposites and the influence of the silicide addition in Si3N4-MoSi2-composites, will give an impression about beneficial microstructural effects suitable to improve the high temperature properties of Si3N4-materials like creep, subcritical crack growth or oxidation resistance.

: http://publica.fraunhofer.de/dokumente/PX-29394.html