Influence of boron substitution on the crystallisation behaviour of tetracalcium phosphate phase in the 4.5SiO2-3Al2O3-1.5P2O5-5CaO glass system |
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| Affiliation: | 1. North Caucasus Federal University, Stavropol, 355029, Russia;2. Southern Scientific Center of Russian Academy of Sciences, Rostov-on-Don, 344006, Russia;3. Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, 119991, Russia;4. ILIT RAS — Branch of FSRC “Crystallography and Photonics” of Russian Academy of Sciences, Moscow, 117342, Russia;5. Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, 600000, Russia;1. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109-2136 USA;2. Ichikawa Research Center, Sumitomo Metal Mining Co., Ltd., Nakakokubun, Ichikawa, Chiba 272-8588 Japan;1. nstitute of Industrial Sciences, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8505, Japan;2. Department of Mechanical Engineering, Faculty of Engineering, Chiba Institute of Technology, Tsudanuma 2-17-1, Narashino, Chiba 275-0016, Japan |
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| Abstract: | This study focuses on the effect of boron substitution on the crystallisation behaviour of an important bioceramic phase, tetracalcium phosphate (TTCP, Ca4P2O9), in the 4.5SiO2-3Al2O3-1.5P2O5-5CaO glass system. The influence of phase separation on the crystallisation activation energy as well as the microstructure is systematically analysed. The results indicate that increasing the extent of substitution of B for Al tends to lead to a decrease of the glass-transition temperature (Tg) and crystallisation temperature (Tp). When the substitution amount of B reaches 15 mol%, phase separation is observed. Weak phase separations during glass making can promote the nucleation of crystals due to heterogeneous nucleation with reduced nucleation activation energy. When 50 mol% B is substituted, serious phase separation is observed, with spherical-shaped TTCP phases appearing in the glass. The growth of striped-shaped TTCP crystals is largely suppressed even when a long holding time (1 h) at 900 °C is applied. |
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| Keywords: | Tetracalcium phosphate Boron Activation energy Striped-shaped |
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