Sintering properties of hydroxyapatite powders prepared using different methods |
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Authors: | S. Ramesh K.L. Aw R. Tolouei M. Amiriyan C.Y. Tan M. Hamdi J. Purbolaksono M.A. Hassan W.D. Teng |
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Affiliation: | 1. Department of Engineering Design and Manufacturing, Advanced Manufacturing and Material Processing (AMMP) Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Ceramics Technology Laboratory, 43009 Kajang, Selangor, Malaysia;3. Faculty of Science and Engineering, Laval University, Quebec, Canada G1V 0A6;4. Ceramics Technology Group, SIRIM Berhad, 1 Persiaran Dato Menteri, Shah Alam, Malaysia |
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Abstract: | In the present work, the sintering behaviour of HA particles prepared via the wet precipitation method (HAp) and wet mechanochemical technique (HAwm) was investigated. The sintering behaviour of a commercial HA powder (HAc) was also studied for comparison purpose. All the three powders were characterised in terms of particle size, Ca/P ratio and crystal size. Green samples were prepared and sintered in air at temperatures ranging from 1000 °C to 1400 °C. The sintered bodies were studied in terms of the phase stability, relative density, Young's modulus, Vickers hardness, fracture toughness and grain size. The results indicated that HAwm samples suffered phase decomposition while the HAp and HAc sintered samples showed no phase disruption throughout the temperature range employed. The HAp samples exhibited the overall best densification and properties when compared to the HAc and HAwm samples. Furthermore, the results showed that mechanical properties of sintered samples were governed by both the bulk density and the grain size. |
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