Abstract
Phase composition, microstructures, and mechanical properties of silicon nitride (Si3N4) ceramics were investigated with ZrB2 and B additives. Results showed that the addition of ZrB2 and/or B in 2.5 and 5 vol.% promoted the phase transformation of α- to β-Si3N4 phase and the formation of bimodal microstructure after hot-pressing at 1500 °C. With the introduction of 2.5 vol.% (ZrB2-B) binary additives, fracture toughness and strength of Si3N4 ceramics increased significantly from 5.2 MPa m1/2 and 384 MPa to 7.2 MPa m1/2 and 675 MPa, respectively. However, the hardness of ceramics decreased slightly from 23.5 GPa to 21.3 GPa, which was still higher than typical values reported on Si3N4 ceramics (15˜17 GPa).
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