Microstructural evolution and micromechanical properties of thermally sprayed hydroxyapatite coating

Abstract

The effects of preheating and annealing processes on the micromechanical features of thermally sprayed hydroxyapatite (HA) coatings were investigated. The results indicated that subsequent heat treatment at 700°C for 60 min promotes the development of a crystalline HA coating. The EDS line scan showed that the oxygen content was homogeneous along the thickness direction from the coating surface to the titanium-HA interface, whereas the calcium and phosphorus concentration gradually decreased at 7 μm from the interface. From the roughness profiles, the coatings on preheated substrates gave lower roughness compared to the coatings at room temperature. According to the nanoindentation results, the sample preheated at 300°C after annealing at 700°C exhibited an elastic modulus of 108.1 ± 6 GPa and hardness of 5.97 ± 0.3 GPa, which were almost 3% lower and 171% higher than the bare substrate, respectively.

Surface modification during hydroxyapatite powder mixed electric discharge machining of metallic biomaterials: a review

“…As a result, the best option for improving biomaterial mechanical properties, corrosion resistance, and biocompatibility is HAp-based coating [138,139]. Despite having a lower elastic modulus than metallic biomaterials similar to bone bio-implants, HA-based ceramics are unsuitable for load-bearing situations due to their poor crystallinity and brittleness [140][141][142]. Consequently, HA powder is used as an additive powder to aid in the creation of coatings while also improving the mechanical and biological properties of biomaterials [143][144][145].…”

Electrodeposition of Hydroxyapatite Coating on Ti6Al4V Alloy: Mechanistic Investigation of the Substrate Crystallographic Texture Effect

“…This feature will affect the adhesion, absorption, and cell proliferation on the implant surface. 50 The roughness of HAp coatings prepared on different surfaces was calculated in terms of S a and R a from 3D micro-topography results and 2D line profiles (Fig. 7a).…”

Development of New Mg- or Sr-Containing Bioactive Interfaces to Stimulate Osseointegration of Metallic Implants

“…Afterwards, the deposition of thin films on metallic substrates can be done by different techniques: spraying, sputtering, ablation, centrifugation, etc. [37][38][39][40]. Pulsed laser deposition (PLD) is such an alternative, involving the ablation of one or more targets with a pulsed laser beam, followed by material transfer via plasma at the surface of a support; stoichiometry preservation and lack of contamination are the most representative assets [41].…”