Hydroxyapatite Formation on Ca-P-O Coating Prepared by MOCVD

Abstract

Ca-P-O coatings of -tricalcium phosphate (-TCP) and hydroxyapatite (HAp) films were prepared on commercially pure Ti (CP-Ti) by MOCVD using Ca(dpm) 2 and (C 6 H 5 O) 3 PO precursors. The behavior of apatite formation on the Ca-P-O coatings was investigated by immersing specimens in a Hanks' solution. An apatite phase has regenerated on the -TCP coating after 1 day, and has covered the whole specimen surface after 14 d. On the HAp coating, an apatite phase has regenerated after 1 h and has covered the whole surface after 6 h. The microstructure of the regenerated apatite phase on the HAp coating has changed from a needle-like to a network texture after 12 h.

Calcium phosphate coating of biomedical titanium alloys using metal–organic chemical vapour deposition

“…According to the literature, CaO was formed together with HAp at almost any substrate temperature and at a R Ca / P conducive to the formation of HAp. 17 Therefore, only a single type of HAp coating appears to be formed on titanium alloys within the narrow constraints of MOCVD conditions. Moreover, in the case of TNTZ alone, additional peaks derived from a-phase titanium appear after both MOCVD conditions.…”

“…Metal-organic chemical vapour deposition (MOCVD) is a variation of this basic CVD technique and has recently been applied to the fabrication of HAp coatings for biomedical applications. 16,17 In this study, HAp and a-TCP coatings were fabricated by MOCVD onto the surface of TNTZ and comparative materials, such as commercially pure Ti grade 2 (CPTi) and Ti-6Al-4V extra low interstitial (Ti64) substrates. The effects of substrate surface roughness, alloy composition and precursor temperature on the type of calcium phosphate formed, and the morphology and thickness of the HAp coating, were subsequently investigated and are discussed herein.…”

Chemical Vapor Deposition of Ca–P–O Film Coating

“…The α-TCP film has uniform and smooth small grains, while the OAp film has a cauliflower structure. Figure 9.8 shows the HAp regeneration behavior in Hanks' solution on the α-TCP film [26]. A small amount of HAp embryo starts to form after 1 day of immersion, and the whole surface of the α-TCP film is covered by HAp after 14 days.…”

Fabrication of Hydroxyapatite Film on Ti-29Nb-13Ta-4.6Zr Using a MOCVD Technique

“…The substrate temperature was 973 K. The deposition time in this study was 15 min, which was determined according to the previous study. 15) In addition, some specimens were treated for 7.5, 10, 30 and 45 min to evaluate the effect of the deposition time on the thickness of the HAp film deposited on TNTZ. The deposition conditions are summarized in Table 1.…”