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Materials based on nanosized beta-Si3N4 composite powders

Werkstoffe auf der Grundlage von beta-Si3N4-Verbundpulver
: Herrmann, M.; Schulz, I.; Zalite, I.


Journal of the European Ceramic Society 24 (2004), No.12, pp.3327-3335
ISSN: 0955-2219
Workshop on Engineering Ceramics <2003, Smolenice>
Journal Article, Conference Paper
Fraunhofer IKTS ()
nanosized composite powder; Nanomaterial; hardness; wear resistance; microstructure formation; commercial realisation; nanopowder; nanocrystallite; grain boundary phase; Hydrolysis; densification; Si3N4-ceramic; Si3N4

Nanomaterials offer the possibility to improve properties like hardness, wear resistance or offer some advantages in production and microstructure formation. The commercial realisation of such materials depends on the one hand on the realisation of improved properties, on the other hand on realisation of the production of powders having constant properties with acceptable prices, as well as reproducible processing. The use of nonoxide nanopowders request additionally a careful control of the oxygen content. In this paper the concept of production of nano beta-Si3N4 composite powders containing besides the nano crystallites of beta-Si3N4, also the grain boundary phase, their processing and resulting microstructures are discussed. The grain boundary phase coating the surface of the powders protect them from further hydrolysis. This possibility allows the production of nanostructured Si3N4ceramics or composites. The densification of such powders, microstructures and properties will be explained.