Caracterización de recubrimientos de hidroxiapatita depositadas sobre la aleación Ti6Al7Nb a través de aspersión térmica a plasma

Abstract

Hydroxyapatite (HA) coated onto titanium alloys by atmospheric plasma-arc spraying is a promising
 technique for improving biocompatibility of materials. The tissue adherence to the HA coating
 increases when compared to the provided by the natural environment of the human body.
 Hidroxyapatite coating applied to a Ti-6Al-7Nb alloy substrate by plasma spray was characterized
 morphologically via Scanning Electron Microscopy (SEM) and X-Ray diffraction. X-Ray diffraction
 results of the HA layer indicated the presence of crystalline HA, amorphous phase and another
 constituents, like tricalcium phosphate (TCP) and calcium oxide. However, after annealing at a
 temperature of 600oC there was recristalisation of the amorphous phase and transformation of some
 of the TCP to HA. SEM results revealed a lamellar morphology which is typical of plasma sprayed
 surfaces. The HA/alloy interface exhibited some irregularities, however these are not present in the
 majority of the interfacial area.

Effect of the Surface Chemical Composition on the Corrosion Resistance in the Mixture of FeCrMoNbB (140MXC) and FeCMnSi (530AS) Coatings Produced with the Electric Wire Arc Spraying Technique: Part I

“…The attenuation in the XRD signals of the hematite may be due to the relatively high cooling rate in the transport phase of the particles and the effect of the different sizes of the nanocomposite powders that serve as nucleators of the crystals influenced by the pressures of projection, as [37] states in his investigations. On the other hand, the projected particles support during the transport phase a microstructural transformation outside the atomization that, at the time of the impact with the substrate, is recrystallized [38].…”