Highly transparent AlON ceramics sintered from powder synthesized by carbothermal reduction nitridation |
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| Affiliation: | 1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;2. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. Shanghai Normal University, Shanghai 200234, China;1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, People’s Republic of China;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, People’s Republic of China;1. Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China;2. Research School of Engineering, Australian National University, Acton ACT 2601, Australia;3. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China;1. Sialon Group, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan;2. Fine Particles Engineering Group, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan;3. Structural Non-oxide Ceramics Group, Research Center for Structural Materials, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan;4. Electric and Electronic Materials Field, Electroceramics Group, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0044, Japan;5. College of Materials, Xiamen University, Xiamen, Fujian, 361005, China;1. The State key Laboratory, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Graduate University of the Chinese Academy of Science, Beijing 100049, China;3. University of Central Florida, College of Optics and Photonics, Orland, FL, United States |
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| Abstract: | Aluminum oxynitride (AlON) powders were synthesized by the carbothermal reduction and nitridation process using commercial γ-Al2O3 and carbon black powders as starting materials. And AlON transparent ceramics were fabricated by pressureless sintering under nitrogen atmosphere. The effects of ball milling time on morphology and particle size distribution of the AlON powders, as well as the microstructure and optical property of AlON transparent ceramics were investigated. It is found that single-phase AlON powder was obtained by calcining the γ-Al2O3/C mixture at 1550 °C for 1 h and a following heat treatment at 1750 °C for 2 h. The AlON powder ball milled for 24 h showed smaller particles and narrower particle size distribution compared with the 12 h one, which was benefit for the improvement of optical property of AlON transparent ceramics. With the sintering aids of 0.25 wt% MgO and 0.04 wt% Y2O3, highly transparent AlON ceramics with in-line transmittance above 80% from visible to infrared range were obtained through pressureless sintering at 1850 °C for 6 h. |
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| Keywords: | AlON transparent ceramics AlON powders Carbothermal reduction nitridation Ball milling time Optical transparency |
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