Study on AlON phase evolution and densification behavior as a function of particle size and doping amount |
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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. 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. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;3. Shanghai Normal University, Shanghai 200234, China |
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| Abstract: | Three groups of AlON powders with D50 = 0.5, 1.1 and 2.7 μm (referred as P0.5, P1.1 and P2.7) were prepared to study the pressureless sintering behavior of AlON. These powders were doped with 0−0.75 wt.% Y2O3 to investigate the combined effect of powder size and doping amount on the phase transformation, microstructure evolution and densification process during heating. The addition of high additive amount to P0.5 and P1.1 powders resulted in massive transformation into α-Al2O3 and AlN, which resulted in agglomeration of α-Al2O3 and isolation of AlN. Although low amount of additive to all three powders can effectively inhibit agglomeration of α-Al2O3 and homogenization of particle size before sintering, its sintering ability is insufficient. 0.05, 0.10 and 0.50 wt.% Y2O3 is the optimal addition to P0.5, P1.1 and P2.7 powders, respectively, to obtain high density, i.e. the larger of AlON powder size, the more Y2O3 is needed. |
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| Keywords: | Aluminum oxynitride Particle size Sintering additive Densification Microstructure |
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