Coating Y2O3 nano-particles with ZrO2-additive via precipitation method for colloidal processing of highly transparent Y2O3 ceramics |
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| Affiliation: | 1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning 110819, China;2. Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China;3. Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;4. Liaoning Engineering Laboratory of Special Optical Functional Crystals, School of Environment and Chemical Engineering, Dalian University, Dalian, Liaoning 116622, China;1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;2. Nano Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;1. Transparent Ceramics Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;2. The State Key Lab of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China;3. Shanghai Normal University, 100 Guilin Road, Shanghai 200234, China;1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China;2. School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore;3. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore;4. College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China;1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, 221116, China;2. Guangdong Provincial Key Laboratory of Materials for High Density Electronic Packaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China;3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, 30332, USA |
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| Abstract: | In the present work, transparent Y2O3 ceramics were prepared via colloidal processing method using ZrO2-coated nano-sized Y2O3 powders. The chemical precipitation method was adopted for the coating of Y2O3 raw powder. The evolution of the coated-ZrO2 layer upon calcination was studied. The rheological behaviors of the slurries of Y2O3 powders coated with different content of ZrO2-additive were investigated. The pHIEP of ZrO2-coated Y2O3 powders shows intermediate values between that of raw Y2O3 and ZrO2 powders. As the ZrO2-coating concentration increased from 0 to 5.0 at%, the magnitude of the negative zeta potential at pH > pHIEP shows a general trend of increment, whereas it decreased at pH < pHIEP. The viscosity decreases pronouncedly with the increase of ZrO2 content from 0.5 at% to 3.0 at%. The suspensions with low viscosity and high stability was achieved for a solid loading of 35.0 vol% using Y2O3 powders coated with 5.0 at% ZrO2. The dispersed suspensions were consolidated by centrifugal casting method and the green bodies shown improved homogeneity. Transparent Y2O3 ceramics were fabricated by vacuum sintering at 1800 ℃ for 5 h. Transmittance at wavelength 800 nm (1.0 mm thick) reached 80.8%, close to the theoretical value of Y2O3. |
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| Keywords: | Transparent ceramics Colloidal processing Nano powders Rheology |
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