Preparation And Characterization Of Hydroxyfluorapatite Coatings Deposited By Radio Frequency Magnetron Sputtering

Hydroxyapatite(HA) coatings on Ti6Al4V substrates has been used as a kind of hard tissue replacement. HA possesses well biocompatibility, which has been discovered through test and in clinical application. However, the relatively large dissolution or resorption rates of HA will result in the failure of the implants. Hydroxyfluorapatite(FHA) in whose structure F- occupies partially the position of OH- in HA, is expected to be more resistant to body fluid and less soluble than HA and still possess almost the same bioactivity as HA. FHA will be used as the substitute of HA to repair and replace hard tissues in dentistry and orthopaedics fields.Hydroxyfluorapatite bioceramic targets of different fluoride content were prepared by the method of solid reaction sintering. During the experiment, studing the effection of fluorine on the structure and density of hydroxyfluorapatite bioceramic targets. The results show that FHA bioceramics are successfully prepared by the solid reaction sintering; The density of bioceramic began to decrease and then to raise with increasing amounts of fluoride content. It also has better issue stability.Hydroxyfluorapatite bioactive coating was deposited on Ti6Al4V substrate by radio frequency magnetron sputtering. To study the microstructure of FHA coating and influence of fluoride content and temperature on the crystallinities of the coating, Surface morphologies, phases and chemical compositions of FHA coatings were analyzed with scanning electron microscopy(SEM), X-ray diffraction(XRD), Fourier infrared absorption spectrometry(FTIR) and energy dispersive X-ray(EDS). The adhesive strength of the coating was tested by bonding experiment. The results show that crystallinities of hydroxyfluorapatite coatings are obviously improved with the increment of fluoride content. The as-sputtered coatings are uniform and dense. n(Ca)/n(P) of the coating is 1.69. The coating have high adhesive strength. The bioactive experiments were tested by the fourth military medical university.