Compositional tailoring effect on crystal structure,mechanical and thermal properties of γ-AlON transparent ceramics |
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| Affiliation: | 1. Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China;2. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, China;3. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China;1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China;2. University of Chinese Academy of Sciences, Beijing, 100039, China;3. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, 350108, China;1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063 China;2. School of Science, Tianjin Polytechnic University, Tianjin, 300160 China;1. Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China;2. Liaoning Engineering Laboratory of Special Optical Functional Crystals, College of Environmental and Chemical Engineering, Dalian University, Dalian 116622, China;3. State Key Laboratory of Light Alloy Casting Technology for High-End Equipment, Shenyang Research Institute of Foundry Co., Ltd, Shenyang 110022, China;4. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | In view of the practical application of γ-AlON as a promising transparent structural ceramic, in-depth insight into its mechanical and thermal properties is essential. The solid-state MAS NMR technique was combined with XRD Rietveld refinement to confirm the crystal structure of Al(8+x)/3O4-xNx (x = 0.299–0.575). These structural parameters were further applied to predict hardness and elastic properties based on theoretical exploration, which are in good agreement with the experimental values. A slight enhancement of mechanical properties with increasing nitrogen concentration is attributed to the stronger chemical bond in octahedra. The experimental thermal conductivity of γ-AlON transparent ceramics was improved slightly with the rise of x in the temperature range from 298 K to 1074 K. The intrinsic lattice thermal conductivity was determined by eliminating the extrinsic phonon scattering as well as the thermal radiation. The reason for the discrepancy between experimental and intrinsic thermal conductivity was revealed. The present methods provided powerful and accessible guidelines in optimizing the mechanical and thermal properties of oxynitride materials. |
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| Keywords: | γ-AlON Transparent ceramics Structural parameters Mechanical properties Thermal conductivity |
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