Effect of LiAl5O8 additions on the sintering and optical transparency of LiAlON |
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| Affiliation: | 1. Ceramatec Inc., 2425 S. 900 W., Salt Lake City, UT 84119, USA;2. University of Rochester, Center for Optical Manufacturing and Laboratory for Laser Energetics, 240 East River Road, Rochester, NY 14623, USA;1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;2. Beijing Advanced Innovation Center of Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China;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. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;2. Department of Mechanical Engineering, University of South Florida, Tampa, FL, 33620, USA;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 |
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| Abstract: | LiAl5O8 (zeta alumina) was reaction sintered with α-Al2O3 and AlN to produce γ-LiAlON. Zeta alumina transforms from a primitive to a face-centered cubic structure above 1290 °C with a lattice parameter similar to γ-AlON. Weight loss measurements combined with XRD suggest solubility of Li in the spinel structure at elevated temperatures. The Vickers hardness, at a 1-kg load, of the pressureless sintered LiAlON was 16.5 ± 0.5 GPa, independent of the grain size or amount of zeta alumina added, for LiAl5O8 additions ranging between 0 and 16 wt.%. In-line transmission in the visible and near-IR regions increased with increasing grain size, most likely due to pore coalescence. |
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