Thin Bioactive Zn Substituted Hydroxyapatite Coating Deposited on Ultrafine-Grained Titanium Substrate: Structure Analysis

Abstract

Nanocrystalline Zn-substituted hydroxyapatite coatings were deposited by radiofrequency magnetron sputtering on the surface of ultrafine-grained titanium substrates. Cross-section transmission electron microscopy provided information about the morphology and texture of the thin film while in-column energy dispersive X-ray analysis confirmed the presence of Zn in the coating. The Zn-substituted hydroxyapatite coating was formed by an equiaxed polycrystalline grain structure. Effect of substrate crystallinity on the structure of deposited coating is discussed. An amorphous TiO2 sublayer of 8-nm thickness was detected in the interface between the polycrystalline coating and the Ti substrate. Its appearance in the amorphous state is attributed to prior to deposition etching of the substrate and subsequent condensation of oxygen-containing species sputtered from the target. This layer contributes to the high coating-to-substrate adhesion. The major P-O vibrational modes of high intensity were detected by Raman spectroscopy. The Zn-substituted hydroxyapatite could be a material of choice when antibacterial osteoconductive coating with a possibility of withstanding mechanical stress during implantation and service is needed.

Laser cladding of bioactive glass coating on pure titanium substrate with highly refined grain structure

“…Such bulk refined structures can be obtained using severe plastic deformation (SPD) processing [27,28]. We found only one publication concerning bioactive coatings on ultrafine-grained cpTi, where radiofrequency magnetron sputtering was used for deposition of thin bioactive Zn substituted HA coating onto ultrafine-grained cpTi [29]. However, there is no available information in literature regarding deposition of bioactive glass onto such substrate as ultrafine-grained cpTi.…”

Hot deformation and fatigue behaviour of a zinc base doped biocompatible material: characterization of plasma spray coating on surface

“…Cracks appear on the surface due to their brittle nature, as shown in figure 6(a). According to Prosolov et al [22], hard reinforcement particles increase the durability and influence the grain size of zinc material. However, increasing to 9% biohybrid composite leads to pores and pits appearing on the material surface, leading to larger grains.…”

Glancing Angle Deposition of Zn-Doped Calcium Phosphate Coatings by RF Magnetron Sputtering

“…The prepared powder was used as a precursor for the preparation of a target for sputtering. Its detailed characterization can be found in our previous report [38]. The powder was pressed and then sintered in air at 1100 • C for 1 h. The chemical composition of the powder and the target was confirmed by X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) [39].…”