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

Abstract

A hydroxyapatite (HAp) film was fabricated on the surface of Ti-29Nb-13Ta-4.6Zr (TNTZ) using a metal-organic chemical vapor deposition (MOCVD) technique, and the mechanical biocompatibility and HAp formability of HAp-coated TNTZ were evaluated and discussed in this study. HAp film is fabricated on the surface of TNTZ by controlling the heating temperature of the source (bis-dipivaloylmethanatocalcium (Ca(dpm) 2 ) and (C 6 H 5 O) 3 PO). An -phase precipitates in the TNTZ matrix after heating the substrate, and the mechanical properties and Young's modulus of HAp-coated TNTZ are improved. HAp-coated TNTZ maintains excellent mechanical biocompatibility. The formability of HAp on HAp-coated TNTZ in Hank's balanced salt solution is better than that of HAp on non-coated TNTZ.

Calcium orthophosphate deposits: Preparation, properties and biomedical applications

“…Afterwards, this technique might be followed by further deposition using a more productive method. [308,310]. Obviously, the precursors must be volatile at relatively low temperatures (< ~ 600 °C) and pressures between 1 Torr and atmospheric pressure.…”

“…To perform MOCVD, both Ca-and P-containing precursors were evaporated by heating and, by means of a carrier gas (e.g., Ar), forwarded into a reactor, in which a heated substrate is located [305][306][307][308][309][310][311]. For better oxidation of the precursors, oxygen might be separately introduced into the reactor, where it is mixed with the precursor vapors.…”

Enhancement of wear and corrosion resistance of beta titanium alloy by laser gas alloying with nitrogen

“…It is necessary to note that the TNZT alloy is a relatively new alloy system, and hence not much work has been done to investigate surface treatment to enhance the wear and corrosion properties. The existing studies in the literature can be split into three streams, namely (1) heat treatment to modify the microstructure and hence to improve the mechanical/functional properties [10,11,12,13,14], (2) laser 3D printing to control the structural architecture and composition [15,16,17,18,19] and (3) surface treatment to improve the bioactivity [19,20,21,22,23,24,25,26,27]. Few attempts on surface hardening of TNZT alloy, namely conventional gas nitriding in furnace, have been made in the literature [28,29].…”

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

“…Moreover, in the case of TNTZ alone, additional peaks derived from a-phase titanium appear after both MOCVD conditions. On the basis of a previous study, 18 it is believed that this a phase is precipitated by an aging effect that is induced by the heating of the substrate to 973 K during MOCVD. Figures 4 and 5 show SEM images of the surface and cross-section of the #1500 polished and mirror polished substrates for TNTZ, CPTi and Ti64 after being exposed to MOCVD condition 1.…”

“…The substrate temperature was set at 973 K. The deposition time was 15 min, and the deposition conditions used were based on those used in our previous reports. 18,19 Evaluation of coating fabricated by MOCVD…”