Abstract
Ta2O5, Nb2O5 and TiO2 were used separately as additives to a Li2O·Al2O3·6SiO2 glass-ceramic composition, to act as nucleating dopants and to aid the formation of an interfacial carbide layer (TaC and NbC) between the fibre and matrix in SiC fibre uniaxially reinforced glass-ceramic composites, The composites exhibited high modulus of rupture (>800 MPa) and fracture toughness (K IC > 15 MPam1/2). The interfacial amorphous carbon rich layer and carbide layer were responsible for lowered interfacial shear strength but permitted high composite fracture toughness. The composite with the TiO2 additive in the matrix showed a lower flexural strength (<500MPa) and a smaller K IC (∼-11 MPam1/2) which resulted from the high interfacial shear strength between the SiC fibre and the matrix due to the formation of the interfacial TiC layer.
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Hsu, J.Y., Speyer, R.F. Fabrication and properties of SiC fibre-reinforced Li2O·Al2O3·6SiO2 glass-ceramic composites. J Mater Sci 27, 381–390 (1992). https://doi.org/10.1007/BF00543927
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DOI: https://doi.org/10.1007/BF00543927