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CrN powder consisting of granular particles of ϳ3 m has been prepared by self-propagating high-temperature synthesis under a nitrogen pressure of 12 MPa using Cr metal. Dense pure CrN ceramics and CrN/ZrO 2 (2Y) composites in the CrN-rich region have been fabricated by hot isostatic pressing for 2 h at 1300°C and 196 MPa. The former ceramics have a fracture toughness (K IC ) of 3.3 MPa⅐m 1/2 and a bending strength ( b ) of 400 MPa. In the latter materials almost all of the ZrO 2 (2Y) grains (0.36 -0.41 m) are located in the grain boundaries of CrN (ϳ4.6 m). The values of K IC (6.1 MPa ⅐ m 1/2 ) and b (1070 MPa) are obtained in the composites containing 50 vol% ZrO 2 (2Y).

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