Properties of calcium phosphates ceramic composites derived from natural materials |
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| Affiliation: | 1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Science and Technology Research Institute, Chiang Mai University, Chiang Mai 50200, Thailand;3. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;4. Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Lanna, Chiang Mai 50300, Thailand;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, China;3. Fenghua Advanced Technology Holding Co., Ltd, Zhaoqing 526000, China;1. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, People''s Republic of China;2. The State Key Lab of High Performance Ceramics and Superfinemicrostructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, People''s Republic of China;1. Department of Materials Science and Engineering, National Cheng Kung University, No. 1, University Road, Tainan 70101, Taiwan;2. Department of Electronic Engineering, Kao Yuan University, No. 1821, Jhongshan Road, Luzhu District, Kaohsiung 82151, Taiwan |
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| Abstract: | In this study, ceramics containing mixed phases of hydroxyapatite/beta-tricalcium phosphate (HA/β-TCP) were fabricated by a solid-state reaction technique. The HA powder was synthesized from cockle shells while the β-TCP powder was synthesized from egg shells. Pure HA and β-TCP fine powders were successfully obtained. The HA and β-TCP were mixed and subjected to a thermal treatment up to 1100 °C. To form the mixed phase ceramics, the resulting powders were sintered at 1350 °C. Effects of HA concentration on the properties of the studied ceramic were investigated. X-ray diffraction analysis revealed that all samples presented multiphase of calcium phosphate compounds. Average grain size of the ceramics decreased with the HA additive content. The 75 wt% HA ceramic showed the maximum hardness value (5.5 GPa) which is high when compared with many calcium phosphate ceramics. In vitro bioactivity test indicated that apatite forming increased with the HA additive content. To increase antibacterial activity, selected ceramics were coated with AgNO3. Antibacterial test suggested that an Ag compound coating on the ceramics could improve the antibacterial ability of the studied ceramics. In addition, the antibacterial ability for the Ag coated ceramics depended on the porosity of the ceramics. |
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| Keywords: | A Sintering C Hardness D Apatite E Biomedical applications |
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