Preparation and properties of negative thermal expansion Zr2WP2O12 ceramics |
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Authors: | Toshihiro Isobe Takuya Umezome Yoshikazu Kameshima Akira Nakajima Kiyoshi Okada |
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Affiliation: | Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan |
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Abstract: | Using solid-state reaction method, Zr2WP2O12 powder was synthesized for this study. The optimum heating condition was 1200 °C for 4 h. The obtained powder was compacted and sintered. The relative density of the Zr2WP2O12 ceramics with no sintering additive was 60%. That of samples sintered with more than 0.5 mass% MgO was about 97%. The average grain size (D50), as estimated from the polished surface of a sample sintered at 1200 °C for 4 h was about 1 μm. The obtained ceramics showed a negative thermal expansion coefficient of about −3.4 × 10−6 °C−1. Young's modulus, Poisson's ratio, three-point bending strength, Vickers microhardness, and fracture toughness of the obtained ceramics were, respectively, 74 GPa, 0.25, 113 ± 13 MPa, 4.4 GPa and 2.3 MPa m1/2. |
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Keywords: | A. Ceramics A. Oxides B. Chemical synthesis D. Mechanical properties D. Thermal expansion |
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