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cBN reinforced Y-alpha-SiAlON composites

: Garrett, J.C.; Sigalas, I.; Herrmann, M.; Olivier, E.J.; O'Connell, J.H.


Journal of the European Ceramic Society 33 (2013), No.11, pp.2191-2198
ISSN: 0955-2219
Journal Article
Fraunhofer IKTS ()
boron nitride (cBN); hardness; SiAlON; Spark Plasma Sintering (SPS); toughness and toughening

Dense alpha-Sialon-cBN composites were produced by FAST/SPS-sintering at 1575-1625 °C. The hardness of the materials increases only up to 21 GPa for materials with 10 vol.% cBN. On the other hand the fracture toughness increases up to nearly 8 MPa m0.5 with 30 vol.% cBN. The reason for the increase in fracture toughness is attributed to crack deflection at cBN grains due to the weak bonding of the grains in the matrix. The weak interfaces are also responsible for the moderate increase in hardness. Detailed investigation of the interface between cBN and the matrix was carried out by TEM.