Analysis of the Decomposition from Fluoridated Hydroxyapatite into TCP

作者：Yang Hongzhen; Rao Qunli^*

来源：Rare Metal Materials and Engineering, 2013, 42: 406-409.

• fluoridated hydroxyapatite(FHA)
• TCP
• thermal stability

In order to increase the thermal stability of hydroxyapatite (HA), fluoridated hydroxyapatite (FHA) was synthesized by a sol-gel method. The results show that the duplex mixtures FHA and Ca-3(PO4)(2) (TCP) are produced, when the samples are sintered at 720, 800, 900, 1000 and 1100 degrees C. The fluorine content is the key condition for the decomposition from FHA into TCP. The mass fraction of TCP decreases with the increasing of fluorine content. The mechanism of the decomposition shows that the structure of FHA becomes more stable when the F content is more than 0.5, but FHA decomposes into TCP easily when the fluorine content is less than 0.5, and the porous structure is formed regularly in the sintered FHA due to the decomposition from FHA into TCP. The TGA studies confirm that the mass loss of FHA is much less than that of HA. The decomposition of FHA has four steps: the evaporation of the absorbed water, the loss of the crystal water, the loss of hydroxyls and the formation of TCP. The functions of the temperature of decomposition and the fluorine content Were simulated: T=250x 700 (x<0.5) and T=750x 500 (x >= 0.5). The increase of the decomposition temperature indicates that F ion could increase the thermal stability of HA.

• 出版日期2013-11
• 单位上海交通大学