Abstract
We have studied the effect of ZrC and ZrO2 additions on the microstructure and properties of ceramic composites based on ZrB2???5% SiC, produced by pressure-sintering mechanically activated powders at a temperature of 1600??C. The results demonstrate that the addition of ZrO2 increases the density, hardness, and fracture toughness of ceramic composites based on ZrB2???5% SiC. In particular, the KIc of the ZrB2???5% SiC ceramic is 4.6 ?? 0.3 MPa m1/2 and that of the composite containing 20% ZrO2 is 7.3 ?? 0.4 MPa m1/2.
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