Effects of powder stoichiometry on the sintering of β-tricalcium phosphate |
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| Affiliation: | 1. RMS Foundation, Bischmattstrasse 12, CH-2544 Bettlach, Switzerland;2. Technical University Bergakademie Freiberg, Institute for Ceramic, Glass and Construction Materials, Agricolastraße 17, 09596 Freiberg, Germany;3. ETH Zürich, Department of Materials, Laboratory of Multifunctional Materials, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland;4. EMPA, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for High Performance Ceramics, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland;1. Institute of Biomedical Engineering and Health Sciences, Changzhou University, Changzhou, Jiangsu 213164, China;2. International Research Centre for Translational Orthopedics (IRCTO), Suzhou, Jiangsu 215006, China;3. School of Materials Science and Engineering, Changzhou University, Changzhou, Jiangsu 213164, China;4. School of Pharmaceutical Engineering and Life Science, Changzhou University, Changzhou, Jiangsu 213164, China;5. Department of Mechanical, Industrial and Manufacturing Engineering, The University of Toledo, Toledo, OH 43606, USA;6. Division of Dentistry, The University of Toledo, Toledo, OH 43606, USA;7. Department of Orthopaedics and Orthopaedic Institute, the First Affiliated Hospital, Soochow University, Suzhou, Jiangsu 215006, China;1. Department of Ceramic Engineering, National Institute of Technology, Rourkela, Odisha 769008, India;2. Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, West Bengal 721302, India;1. Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225, Vilnius, Lithuania;2. Institute of Inorganic Chemistry, University of Cologne, Greinstrasse 6, 50939, Cologne, Germany;3. Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063, Riga, Latvia |
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| Abstract: | The impact of weak stoichiometry variations on β-TCP sintering behaviour was studied. β-Tricalcium phosphate (β-TCP) powders were synthesised by chemical precipitation through aqueous solution of diammonium phosphate and calcium nitrate. Excess or deficiency of nitrate salt leads to compositions with Ca/P ratios below or over 1.5. These powders, calcined at various temperatures (800–950 °C), were shaped by slip casting process and sintered at 1100 °C. The microstructure, phase composition, specific surface area and density of powders and sintered compacts were analysed by SEM, XRD, FTIR, BET, Archimedes methods and dilatometry.This study shows that the presence of calcium pyrophosphate or the hydroxyapatite phases affects considerably the physical characteristics of the β-TCP powders and in particular specific surface area and consequently their sinterability.A precise determination of the β-TCP chemical composition after synthesis allows to adapt the calcination temperature of the raw powder in order to obtain a maximum densification of the compact. The beneficial role of small quantity of HA phase inside β-TCP powder on their sinterability was also shown in this work. |
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