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Synthesis parameters of hydroxyapatite preparation by a precipitation process

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2022, 32(3), pp.96-102
  • DOI : 10.6111/JKCGCT.2022.32.3.096
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : May 31, 2022
  • Accepted : June 13, 2022
  • Published : June 30, 2022

Sung Wook Moon 1 BYEONG WOO LEE 1

1한국해양대학교

Accredited

ABSTRACT

Hydroxyapatite (HAp) was synthesized from calcium hydroxide (Ca(OH)2) reacting with phosphoric acid (H3PO4) in aqueous solution. HAp powders were synthesized from extremely high concentration of precursor solutions over 3 M of Ca(OH)2 aqueous suspension using modified process parameters such as phosphoric acid (H3PO4) pouring rate, aging time and post ball milling process. Regardless of phosphoric acid pouring rate, the DCPD (dicalcium phosphate dihydrate) was formed at room temperature and when heated above 700°C, β-TCP (tricalcium phosphate) was synthesized and the amount reached its maximum at 900°C. When the synthesized powder was sintered at 1150°C, β-TCP, a high temperature impurity phase, remained. The single HAp phase without DCPD was obtained from post ball-milled precipitates followed by 3 day aging. For the ball-milled precipitates even without the aging process, the desired single HAp phase without β-TCP could be obtained by heat treatment above 500°C. The post ball milling process provided a convenient route for HAp synthesis.

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