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Densification and properties of superhard B6O materials with cobalt additions

: Johnson, O.T.; Sigalas, I.; Herrmann, M.; Kleebe, H.J.


Journal of the European Ceramic Society 32 (2012), No.10, pp.2573-2579
ISSN: 0955-2219
Journal Article
Fraunhofer IKTS ()
boron suboxide (B6O); mechanical properties; microstructure-final; sintering

The search for suitable additives for boron suboxide (B 6O) materials which could improve densification, reduce sintering temperature and tailor the microstructure has been productive. B 6O materials doped with 0-5vol% cobalt addition were sintered at temperatures up to 1850°C and pressure of 50MPa for 20min. Relationships between the formed phases, microstructures and mechanical properties of the sintered materials were investigated as a function of sintering conditions and added cobalt content. The hardness of the sintered B 6O materials increases with sintering temperature, while the fracture toughness increases with increasing cobalt content and reduces with increasing sintering temperature.