Processing and Mechanical Behavior of CrN/ZrO2(2Y) Composites |
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Authors: | Yoshihiko Takano,Masahiro Hachiya&dagger ,Masaru Yoshinaka&dagger ,Ken Hirota,Osamu Yamaguchi |
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Affiliation: | Tanaka Galvanizing Co. Ltd., Nishiyodogawa–ku Osaka 555-0012, Japan;Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyo–Tanabe Kyoto 610-0321, Japan |
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Abstract: | CrN powder consisting of granular particles of ∼3 μm 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/ZrO2(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 MPa ·m1/2 and a bending strength (σb) of 400 MPa. In the latter materials almost all of the ZrO2(2Y) grains (0.36–0.41 μm) are located in the grain boundaries of CrN (∼4.6 μm). The values of K IC (6.1 MPa · m1/2) and σb (1070 MPa) are obtained in the composites containing 50 vol% ZrO2(2Y). |
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Keywords: | processing mechanical properties composites |
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