Preparation of high-quality transparent Al-rich spinel ceramics by reactive sintering |
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| Authors: | Dan Han Jian Zhang Peng Liu Gui Li Liqiong An Shiwei Wang |
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| Affiliation: | 1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;3. The State Key Lab of High Performance Ceramics and Surperfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China;4. School of Physics and Electronics Engineering, Jiangsu Normal University, Xuzhou 221116, PR China;5. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, PR China |
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| Abstract: | Transparent Al-rich spinel ceramics (MgO·nAl2O3, n = 1.05–2.5) were prepared by reactive sintering in air followed by the hot isostatic press (HIP). Commercial MgO and γ-Al2O3 powders were used as the raw materials, and the effects of composition and HIP temperature on the transmittance and microstructure of resulting samples were investigated. To obtain the high optical quality, extra alumina (n ≥ 1.1) was used to help eliminate residual pores and suppress abnormal grain growth during the sintering process. The appropriate HIP temperature was also critical to realize the single-phase formation and prevent the generation of second-phase precipitates. The resulting samples with n = 1.1 and 1.3 exhibited excellent optical quality and fine grains below 5 µm after HIPed at 1550 °C. |
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| Keywords: | Spinels Reactive sintering Optical properties Grain size |
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