ISSN:
1013-9826
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Owing to the excellent biocompatibility and corrosion-resistance of titanium andbioactivity of hydroxyapatite, the titanium/hydroxyapatite composite material combining theiradvantages is a highlight with bright prospects in medical clinics. In the present paper, the microarcoxidation (MAO) was performed on commercial pure titanium at first. Furthermore, thehydrothermal treatment (HT)was given with media of deionized water at 200°C for 4h in anautoclave. The surface morphology of the samples was observed by scanning electron microscopy(SEM), and the detailed composition was analyzed with Energy-Dispersive X-Ray Spectroscopy(EDS). The X-ray diffraction analysis (XRD) was employed to characterize the crystal structure ofcomposite. The results indicate that the titania film contains the Ca and P elements on titaniumsubstrate after MAO, which converts into the hydroxyapatite crystals via hydrothermal treatment.The smaller size and amount of hydroxyapatite crystals are found when lower voltage is presented.But there are converse phenomena with higher voltage, especially, the differences can be neglectedabove 400V. It is shown that the micro-hole and hollow surface of titania film can induce thehydroxyapatite nucleation and growth as two different forming ways. The hydroxyapatite has apreference of forming in hollow surface with lower voltage, however, the presences of the micro-holeand hollow surface of titania film are occurring for higher voltage. The hydroxyapatite forming inmicro-hole shows needle-like crystal and high bonding strength with surrounding titania film becauseof the mechanical restrict force from micro-hole wall. Also it is noted that hydroxyapatite crystalsincline to precipitate on the film surface with high Ca and P concentrations after the hydrothermaltreatment
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.734.pdf
Permalink
