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Reactive and non-reactive preparation of B6O materials by FAST/SPS

: Thiele, Maik; Herrmann, Mathias; Müller, C.; Gestrich, Tim; Michaelis, Alexander


Journal of the European Ceramic Society 35 (2015), No.1, pp.47-60
ISSN: 0955-2219
Deutsche Forschungsgemeinschaft DFG
MI 509/21-1
Development of novel, wear-resistant boron suboxide based materials
Journal Article
Fraunhofer IKTS ()
boron suboxide; mechanical properties; microstructure-final; wear parts

B6O materials were prepared by a reactive and a non-reactive sintering routine using FAST/SPS and sintering temperatures of 1850 °C. Their sintering behavior, phase and microstructure formation and the mechanical properties are comparatively discussed. We demonstrate that the reactive sintering of B/B2O3-mixtures with oxide sintering additives is a promising and cost-effective alternative to the densification of pre-synthesized B6O with a resulting hardness of up to 22 GPa (HV5) and a fracture toughness of up to View the MathML source3 MPa m (SEVNB) similar to non-reactive prepared B6O materials. The flexure strength is up to 360 MPa and 540 MPa for the reactive and non-reactive sintered materials, respectively, and substantially affected by the amount of B2O3 in the sintering liquid.