Ti and its alloys, which are commonly used in biomedical applications, are often preferred due to their proximity to the mechanical properties of bone. In order to increase the biocompatibility and bioactivities of these materials, biomaterials based on ceramic are used in coating operations. In this study, by using an electrophoretic deposition method, instead of on the Ti6Al4V alloy which is commonly used in the literature, a hydroxyapatite (HA) coating operation was applied on the surface of the Ti6Al7Nb alloy, and the surface properties of the coatings were examined. Ti6Al7Nb is a new-generation implant on which there have not been many studies. The voltage values which were used in the coating operation were 50, 100, 150 and 200 V, and the time parameter was stabilized at 1 min. In our method, when preparing the solution, HA, ethanol, and polyvinyl alcohol (PVA) were used. At the end of the study, by using an electron microscope (SEM) the microstructures of the coatings were examined; elemental analyses (EDS) of the coating surfaces were performed; and by using an X-radiation diffraction (XRD) method, the phases which the coatings contained and the concentration of these phases were determined, and the coating thickness, roughness, and hardness values were also determined. Also, by conducting a Scratch test, the strength of the surface combination was examined. At the end of the study, in each parameter, a successful HA coating was seen. By comparing parameters with each other, the ideal voltage value in this coating was determined. It was determined that the most suitable coating was obtained at 100 V voltage and 1 min deposition time.

In this study, the effect of shot blasting on boriding kinetics of AISI 316L stainless steel alloy was investigated. For this purpose, AISI 316L samples were shot blasted at 6 bar pressure using 300–500 µm glass beads. Shot blasted samples were borided with powder pack boriding technique, using Ekabor 2 boriding powder, with 2, 4 and 6 boriding times at 850, 900 and 950°C boriding temperatures. As a result of boriding, boride layers consisting of FeB and Fe2B phases with a microhardness of ~1497–2135 HV0.1 and an average thickness of ~9.6–49.27 µm were obtained on the surface of AISI 316L stainless steel alloy samples. These boride layers on the AISI 316L stainless steel alloy surface were formed in flat morphology due to the high amount of alloying elements. In the kinetic studies, the activation energy of boron diffusion in AISI 316L stainless steel alloy was calculated as 204.68 kJ mol^–1. The obtained results showed that shot blasting decreased the boron diffusion kinetics compared to the results in the literature.

Los implantes habituales en aplicaciones biomédicas como el Ti y sus aleaciones y el acero inoxidable 316L pueden dañar los tejidos circundantes, ocasionando infecciones. Para evitar este riesgo, es necesario producir materiales de implantes de nueva generación que sean más ligeros que los biomateriales existentes, en los que las propiedades mecánicas y estructura sean similares al hueso. En este estudio, el material de implante de aleación de Mg AZ91 se obtiene mediante un procedimiento pulvimetalúrgico. Adicionalmente, para mejorar la biocompatibilidad y bioactividad, el material de implante obtenido se recubrió con hidroxiapatita (HA), conocido como biomaterial de base cerámica. Se aplicó un revestimiento de HA a la superficie de la aleación utilizan el método de deposición electroforética. Se examinaron las propiedades superficiales y la resistencia a la corrosión. Los valores de voltaje aplicados en el proceso de recubrimiento fueron 100, 150, 200 y 250 V, durante un tiempo de 2 min. Se utilizaron productos químicos de HA, etanol, alcohol polivinílico (PVA), N, N-dimetilformamida para preparar la solución de revestimiento. Se analizaron las microestructuras de los recubrimientos mediante microscopía electrónica de barrido (SEM) y se realizaron análisis elementales (EDS) de las superficies del recubrimiento. Se utilizó el método de difracción de rayos X (XRD) para determinar las fases de los recubrimientos y su concentración. Finalmente, se determinaron los valores de espesor del revestimiento y la rugosidad superficial. El comportamiento frente a la corrosión se determinó mediante la medida de potencial de corrosión, utilizando como electrolito un fluido corporal artificial.

This study focuses on enhancing the biomedical performance of PBF-LB Ti6Al4V, produced using Selective Laser Melting (SLM), an advanced manufacturing technology widely used for patient-specific medical devices and implants. Hydroxyapatite (HA), titanium (Ti), and bilayer Ti/HA coatings were applied, using the powder flame spray coating technique. A comprehensive analysis was conducted to examine the microstructural, chemical, and mechanical properties of the coatings. Surface analysis was performed using a scanning electron microscope (SEM), chemical composition was determined by energy-dispersive spectroscopy (EDS), crystal structure was analyzed via X-ray diffraction (XRD), and surface roughness was evaluated through topographic analyses. Additionally, in vitro wear and corrosion resistance tests, crucial for biomedical applications, were conducted. In wear tests, HA coatings exhibited the lowest wear resistance with the highest wear rate (73.83 × 10⁻³ mm³/N·m), while Ti coatings showed the highest wear resistance (6.32 × 10⁻³ mm³/N·m), and Ti/HA coatings demonstrated an intermediate performance (34.22 × 10⁻³ mm³/N·m). Corrosion tests revealed that bilayer Ti/HA coatings provided the best protection (0.00009 mm/year), followed by Ti coatings (0.0002 mm/year) and HA coatings (0.003 mm/year). The results indicate that Ti/HA coatings offer the most suitable biomedical performance.

This paper reports on electrophoretic deposition of hydroxyapatite coatings on 316L stainless steel and Ti6Al4V alloy. Coatings were carried out at 60 sec. deposition time and voltage values of 40, 80, 120, 160 Voltage. Suspension: It was prepared by using Ethanol, Hydroxyapatite, Polyvinyl Alcohol, Sodium dodecyl sulfate, N-N-Dimethylformamide chemicals. The findings and results acquired at the end of the study have been presented and discussed. When the Ca/P values calculated in the study are examined, it was seen that there are values close to the ideal Ca/P ratio (1.67) in all parameters. When the roughness values are examined, it was seen that coatings close to the ideal surface roughness value (1-1.5 µm) are obtained. When the nano indentation test results were evaluated, it was observed that coatings suitable for shell bone implants were obtained.