Abstract
Cr2N, CrN and their mixtures with desired fractions were prepared by self-propagating high-temperature synthesis (SHS) under controlled nitrogen pressure and then followed by hot isostatic pressing at 1300°C and 196 MPa under argon gas. The combustion temperature increased with increasing nitrogen pressure. Single-phase Cr2N and CrN were formed at 1040° under 0.18 MPa N2 and 1730°C under 2 MPa N2, respectively. The mechanical properties of chromium nitride ceramics with relative density of 99.2% were examined; Vickers hardness Hv(CrN:11.2 GPa and Cr2N: 14.5 GPa) linearly increased with increasing fraction of Cr2N, whereas fracture toughness KIC (-4.7 MPa⋅m1/2) and bending strength σb (-355 MPa) were constant regardless of the fraction of Cr2N/CrN.
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