Direct coarse powder aqueous slip casting and pressureless sintering of highly transparent AlON ceramics |
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| Affiliation: | 1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Tianjin Key Laboratory of Optical Thin Films, Tianjin Jinhang Technical Physics Institute, Tianjin 300192, China;3. Department of Electrical Science and Engineering, Nankai University, Tianjin 300071, China;4. Zhangjiagang Huipu Optical Material Company, Zhangjiagang 215600, China;5. Institute for Advanced Study, Chengdu University, Chengdu 610106, China;1. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China;2. Tianjin Key Laboratory of Optical Thin Films, Tianjin Jinhang Technical Physics Institute, Tianjin 300192, China;3. College of Physical Science and Technology, Sichuan University, Chengdu 610064, China;4. Institute for Advanced Study, Chengdu University, Chengdu 610106, China;1. College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang, 473061, China;2. Tianjin Key Laboratory of Optical Thin Films, Tianjin Jinhang Institute of Technical Physics, Tianjin, 300192, China;3. Southwest Institute of Technical Physics, Chengdu, 610041, China;4. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, 621010, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3. Key Laboratory of Transparent and Opto-functional Inorganic Materials, Chinese Academy of Sciences, Shanghai 200050, 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 |
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| Abstract: | Direct coarse powder aqueous slip casting was proposed to prepare AlON green body for pressureless sintering of highly transparent AlON ceramics. It was reported that anti-hydrolysis treatment to AlON powder before aqueous slip casting was essential due to hydrolysis reaction between AlON and water. However, both XRD of hydrolyzed powder and pH value of aqueous slurry indicate that the hydrolyzate amount is positively correlating with hydrolysis reaction area, i.e., surface area of powder. Therefore, replacing fine particle with coarse one to reduce surface area of powder is an efficient hydrolyzates reduction scheme by lessening hydrolysis reaction sites. As a result, the hydrolyzate in green body of direct slip casting coarse AlON powder (91 vol% of particles have a size of >1.0 μm) was successfully reduced to an insignificant amount so that the sintered ceramics had a high transmittance (84.1% at ~3750 nm), which also verified the effectiveness of the proposed hydrolyzate-reduction scheme. |
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| Keywords: | AlON Coarse powder Hydrolysis Aqueous slip casting Transparent ceramics |
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