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.
RAO Qunli,FAN Xiaolan,GU Xiang,LI Lingling
. Influence of Fluorine on Calcium Deficient Hydroxyapatite Synthesis and
Improvement of Thermo Stability[J]. Journal of Shanghai Jiaotong University, 2020
, 54(5)
: 544
-550
.
DOI: 10.16183/j.cnki.jsjtu.2020.05.012
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