Journal of Ceramic Processing Research

Ceramic Processing Research Center (한양대학교 세라믹연구소)
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Wet preparation of calcium phosphates from aqueous solutions

  • Lee, Byeong Woo (Dept. of Ocean Advanced Materials Convergence Engineering, Korea Maritime and Ocean University) ;
  • Hong, Il Gok (Dept. of Ocean Advanced Materials Convergence Engineering, Korea Maritime and Ocean University)
  • Received : 2019.06.07
  • Accepted : 2019.09.26
  • Published : 2019.12.01
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Abstract

Calcium phosphates such as HA (hydroxyapatite), β-TCP (tricalcium phosphate) and biphasic HA/β-TCP, were synthesized by wet chemical precipitation in aqueous solution combined with ball milling process. Nanosize powders of the calcium phosphates were synthesized using Ca(OH)2 and H3PO4. The effects of initial precursor Ca/P ratio (1.30, 1.50 and 1.67), ball milling process and post heat-treatment on the phase evolution behavior of the powders were investigated. The phase of resulting powder was controllable by adjusting the initial Ca/P ratio. HA was the only phase for as-prepared powders in both cases of Ca/P ratios of 1.50 and 1.67. The single HA phase without any noticeable second phase was obtained for the initial Ca/P ratio of 1.67 in the overall heat-treatment range. Pure β-TCP and biphasic calcium phosphate (HA/β-TCP) were synthesized from precursor solutions having Ca/P molar ratios of 1.30 and 1.50, respectively, after having been heat-treated above 700 ℃. The β-TCP phase has appeared on the pre-existing DCPD (dicalcium phosphate dihydrate) and/or HA phase. Dense ceramics having translucency were obtained at a considerably lower sintering temperature. The modified process offered a fast, convenient and economical route for the synthesis of calcium phosphates.

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