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B6O materials with Al2O3/Y2O3 additives densified by FAST/SPS and HIP

: Thiele, M.; Herrmann, M.; Michaelis, A.


Journal of the European Ceramic Society 33 (2013), No.13-14, pp.2375-2390
ISSN: 0955-2219
Journal Article
Fraunhofer IKTS ()
boron suboxide; mechanical property; microstructure-final; wear parts

Fully densified B6O materials with Al2O3/Y2O3 sintering additives amounts systematically varied between 0 and 15 vol.% and Al2O3/(Al2O3 + Y2O3) molar ratios of 0.05-1 were prepared by FAST/SPS and HIP at sintering temperatures between 1725 °C and 1900 °C. Their densification and microstructure were correlated with measured mechanical properties. The addition of low additive amounts in the range of 2-3 vol.% was found to increase the fracture toughness and strength from 2.0 MPa m1/2 (SEVNB) and 420 MPa for pure B6O to about 3.0 MPa m1/2 and 540 MPa, but it had no effect on the hardness, which remained at a high level of 30-36 GPa (HV0.4). Higher additive contents did not yield a further improvement in the toughness but resulted in a reduction in hardness and strength.