Abstract
In this study, microporous composite sol–gel glass/polyetheretherketone (SGG/PEEK) coatings were produced on the Ti-13Nb-13Zr titanium alloy by electrophoretic deposition. Coatings with different levels of high open porosity were developed by introducing SGG particles of varying diameters into the PEEK matrix. The microstructure of the coatings was characterized by electron microscopy and X-ray diffractometry. The coatings with 40-50 µm thickness were composed of semicrystalline SGG particles consisting of hydroxyapatite, CaSiO3, some Ca2SiO4, and an amorphous phase containing Ca, Si, P, and O, homogeneously embedded in a semicrystalline PEEK matrix. The size of SGG particles present in the coatings strongly influenced the formation of microcracks and their adhesion to the underlying substrate. Microscratch tests showed that the coating containing SGG particles with a diameter smaller than 45 µm and open porosity of 45 pct exhibited good adhesion to the titanium alloy substrate, much better than the coating containing particles with a diameter smaller than 85 µm and total open porosity equal to 48 pct. The corrosion resistance was investigated in Ringer’s solution at a temperature of 310 K (37 °C) for a pH equal to 7.4 and in deaerated solutions with the use of open-circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy. The SGG/PEEK-coated alloy indicated better electrochemical corrosion resistance compared with the uncoated alloy.
Highlights
TITANIUM alloys are the most frequently used metallic materials for biomedical applications due to their high strength-to-weight ratio, high fatigue resistance, and good biocompatibility.[1,2] Today, the most important titanium alloys, which have found applications in medicine, are b alloys
The electrophoretic deposition depends on (i) parameters related to the suspension including chemical composition, morphology, and particle size and the type of solvent, as well as (ii) the physical conditions of the deposition process such as potential difference and time
Microporous SGG/PEEK coatings were successfully deposited on the Ti-13Nb-13Zr alloy by Electrophoretic deposition (EPD)
Summary
TITANIUM alloys are the most frequently used metallic materials for biomedical applications due to their high strength-to-weight ratio, high fatigue resistance, and good biocompatibility.[1,2] Today, the most important titanium alloys, which have found applications in medicine, are b alloys. They exhibit low elastic modulus and density, high strength, and ductility as well as good electrochemical corrosion resistance.[3,4,5] their use in medicine is limited by their. A good response to the improvement of the mechanical properties of highly porous coatings may be the introduction of a polymer and the deposition of composite polymer-based coatings incorporating ceramic particles
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
