Journal of Shanghai Jiaotong University ›› 2020, Vol. 54 ›› Issue (5): 544-550.doi: 10.16183/j.cnki.jsjtu.2020.05.012

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Influence of Fluorine on Calcium Deficient Hydroxyapatite Synthesis and Improvement of Thermo Stability

RAO Qunli 1,FAN Xiaolan 2,GU Xiang 1,LI Lingling 1   

  1. 1. Instrumental Analysis Center, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Engineering Practical Training Center, Shanghai University of Engineering Science, Shanghai 201620, China
  • Published:2020-06-02

Abstract: Fluoridating holds considerable promising for improving thermos stability of calcium-deficient hydroxyapatite with reserving pristine good biocompatibility and bio-activity. In this paper, synthetic products and their thermo stability are studied with different fluorine additions under the same chemical precipitation condition by X-ray diffraction (XRD). Dicalcium phosphate dihydrate (DCPD) is the main product with few hydroxyapatite (HA) when no fluorine is added; mixture of calcium-deficient fluoridated hydroxyapatite (D-FHA) and DCPD appears in products when fluorine is added, and only D-FHA remains in products of Sample 04F. Influence of fluorine on the synthetic process is proved to accelerate the transformation from DCPD to D-FHA. Synthetic products are further sintered to investigate the thermo stability. Dehydration occurs only in Sample 00F and Sample 02F when heated at 200℃, which does not appear in Samples 04F—10F. D-FHA of Sample 04F begins to decompose into β-Ca3(PO4)2 and β-Ca2P2O7 at 600℃. The temperature of D-FHA decomposition rises and the stability improves with the increasing fluorine addition.

Key words: hydroxyapatite; fluoridation; X-ray diffraction (XRD); calcination; phase transformation

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