Browsing by Subject "COMPOSITE COATINGS"

Now showing 1 - 3 of 3
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    Characterization of a Duplex Coating (Boriding plus Hydroxyapatite) on Austenitic Steel
    (MAIK NAUKA/INTERPERIODICA/SPRINGER) Bahçepinar, AI; Ayvaz, SI; Aydina, I
    In this study, duplex coating process (Boriding + Hydroxyapatite) was applied to 316L stainless steel alloys. Before coating, the substrate materials were shotblasted with 300-500 mu m glass beads in a vacuum type shot blast machine. Tribological properties of the alloy with boriding process, its bioactivity and biocompatibility was increased with the hydroxyapatite (HA) coating process. Powder pack boriding technique was used in boriding process and Electrophoretic deposition method (EPD) was used in HA coating process. At the end of the study, the microstructures (SEM), elemental analyzes of the coating surfaces (EDS), Ca/P ratios, coating thicknesses were determined. In addition, the hardness and adhesion qualities of the boride layer were determined. When the results obtained are evaluated, duplex layers were successfully formed for all parameters.
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    Investigation of in vitro behavior of plasma sprayed Ti, TiO2 and HA coatings on PEEK
    (ELSEVIER SCIENCE SA) Sargin, F; Erdogan, G; Kanbur, K; Turk, A
    Orthopedic implants are one of the most reliable and widely used equipments to increase the quality of human life by enhancing or replacing damaged body parts and ensuring the problematic parts of the body to become operative after a short time period. Polyether ether ketone (PEEK) is a semi-crystal high-performance thermoplastic polymeric implant material which emerged as an alternative for metallic implants that used in orthopedic surgery. Although PEEK has some superior properties such as high melting point, superb wear resistance, excellent fatigue behavior, non-toxicity for bone tissue and elasticity modulus similar to human bone, PEEK has some disadvantages such as biologically inert behavior and low bioactivity. In this context, coating the implant surface to improve its osteointegration behavior is widely accepted. Coating PEEK polymers with bioactive materials such as Hydroxyapatite (HA) is among one of the solutions for this problem. In this study, in order to increase surface bioactivity of PEEK biomaterials, Titanium (Ti), Titanium dioxide (TiO2) and Hydroxyapatite (HA) powder combinations was coated on PEEK samples by using Atmospheric Plasma Spray (APS) method. Morphological and chemical characterization showed produced coatings are suitable for implantation process. Also in vitro tests performed in Simulated Body Fluid (SBF) revealed that HA, Ti + HA and TiO2 + HA coatings have bioactive property.
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    Investigation of the effect of shot blasting on the surface properties of the HA coatings processed by the EPD method
    (REDAKCIA KOVOVE MATERIALY) Bahçepinar, AI; Aydin, I
    316L stainless steel implant material surfaces shot blasted with glass beads underwent hydroxyapatite (HA) coating process by electrophoretic deposition method (EPD). The me-chanical and metallographic test results of HA coatings applied to the shot blasted and sanded substrates have been discussed. The sanded process was carried out with 320 Grit SiC sandpa-per. Shot blasted process was carried out in a vacuum shot blasting machine at 5 bar pressure with glass beads. Ethanol was used as a solvent during the coating process. The coating so-lution was prepared by mixing ethanol, HA, PVA, and N, N-Dimethylformamide chemicals in specific ratios to have a steady suspension. Regarding tests conducted on HA coatings, it was revealed that shot blasted surfaces had better results when compared to those of sanded surfaces. Hopefully, this new process for coatings will be a new impression for future studies.