WEN Shaozhen, YU Benrui, LIU Li, ZHU Qingxia
(Tianjin Key Laboratory of Advanced Fibers and Energy Storage, School of Material Science and Engineering,
Tiangong University, Tianjin 300387, China)

Abstract: Strontium-fluorine co-doped hydroxyapatite (SrFHA) ceramics were prepared by using chemical precipitation method, while their effects on thermodynamic properties of the HA ceramics were studied with XRD, SEM and so on. It is found that the presence of Sr reduced thermal stability of HA, but the effect of F was positive. An appropriate amount of Sr doping is conducive to the sintering densification of HA. When the Sr concentration is 5%, the HA ceramics reached the maximum flexural strength (35.86 MPa) and the maximum coefficient of thermal expansion (CTE = 11.86×10−6, 600 ℃). The CTE value could be reduced through F doping, together with improvement in flexural strength but inhibition of sintering.
Key words: hydroxyapatite; strontium-fluorine co-doping; thermal stability; flexural strength; coefficient of thermal expansion