Comparative study of the hydroxyapatite coatings prepared with/without substrate bias

Dudin, S.V.; Cotruț, Cosmin M.; Dinu, Mihaela; Zykova, A.; Parau, Anca Constantina; Yakovin, S.; Vlădescu, Alina

doi:10.1016/j.ceramint.2017.08.016

Cited by 15 publications

(7 citation statements)

References 33 publications

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“…The protective efficiency (P e ) was also calculated based on the formula reported in Refs. [73,74], considering the ion corrosion densities of the substrate (i corr-substrate ) and coating (i corr_coating ):…”

Section: Characterization Of Coatingsmentioning

confidence: 99%

In Vitro Corrosion of Titanium Nitride and Oxynitride-Based Biocompatible Coatings Deposited on Stainless Steel

et al. 2020

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The reactive cathodic arc deposition technique was used to produce Ti nitride and oxynitride coatings on 304 stainless steel substrates (SS). Both mono (SS/TiN, SS/TiNO) and bilayer coatings (SS/TiN/TiNO and SS/TiNO/TiN) were investigated in terms of elemental and phase composition, microstructure, grain size, morphology, and roughness. The corrosion behavior in a solution consisting of 0.10 M NaCl + 1.96 M H2O2 was evaluated, aiming for biomedical applications. The results showed that the coatings were compact, homogeneously deposited on the substrate, and displaying rough surfaces. The XRD analysis indicated that both mono and bilayer coatings showed only cubic phases with (111) and (222) preferred orientations. The highest crystallinity was shown by the SS/TiN coating, as indicated also by the largest grain size of 23.8 nm, which progressively decreased to 16.3 nm for the SS/TiNO monolayer. The oxynitride layers exhibited the best in vitro corrosion resistance either as a monolayer or as a top layer in the bilayer structure, making them a good candidate for implant applications.

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Section: Characterization Of Coatingsmentioning

confidence: 99%

In Vitro Corrosion of Titanium Nitride and Oxynitride-Based Biocompatible Coatings Deposited on Stainless Steel

et al. 2020

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“…Taking into account the electrochemical parameters, the porosity (P) was calculated, using Elsener's empirical equation [41]. The protective efficiency (P e ) was also determined by a formula reported in [24]. Mansfeld [42] and Scully [43] described how the E OC potential is the parameter that is related to the nobility of a surface at contact with a corrosive medium.…”

Section: In Vitro Electrochemical Behaviourmentioning

confidence: 99%

“…The corrosion behaviour was observed by electrochemical tests in simulated body fluid (SBF) solution (composition presented in [24] pH = 7.2) at 37 ± 0.4 • C, using a PARSTAT 4000 system (Princeton Applied Research, Princeton, NJ, USA). Each sample (working electrode) was inserted in a Teflon holder and an area of 1 cm 2 was in contact with corrosive solution.…”

Section: In Vitro Corrosion Behaviourmentioning

confidence: 99%

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

et al. 2017

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Abstract:This study aims to analyze hydroxyapatite (HAP) coatings enriched with Mg and Ti prepared by a magnetron sputtering technique on Ti6Al4V substrate. For preparation of the coatings, three magnetron targets (HAP, MgO and TiO 2 ) were simultaneously co-worked. The concentration of Mg added was varied by modifying the power applied to the MgO target. In all coatings, the Ti concentration was maintained constant by keeping the same cathode power fed during the whole deposition. The influence of different Mg dopant contents on the formation of phase, microstructure and morphology of the obtained Ti-doped HAP coatings were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Moreover, the effects of Mg addition upon corrosion, mechanical and biological properties were also investigated. Mg-and Ti-doped HAP coating obtained at low radio-frequency (RF) power fed to the MgO target provided material with high corrosion resistance compared to other coatings and bare alloy. A slight decrease in hardness of the coatings was found after the Mg addition, from 8.8 to 5.7 GPa. Also, the values of elastic modulus were decreased from 87 to 53 GPa, this being an advantage for biomedical applications. The coatings with low Mg concentration proved to have good deformation to yielding and higher plastic properties. Biological test results showed that the novel surfaces exhibited excellent properties for the adhesion and growth of bone cells. Moreover, early adherent vital cell numbers were significantly higher on both coatings compared to Ti6Al4V, suggesting that Mg ions may accelerate initial osteoblast adhesion and proliferation.

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“…These parameters were judiciously selected based on our previous results published in Refs. [35][36][37][38][39][40][41][42]. We also intended to obtain coatings with a thickness around 300 nm.…”

Section: Coating's Preparationmentioning

confidence: 99%

Bio-Functionalization of a Novel Biocompatible High Entropy Alloy Used For Bone Implants

Mm¹,

Vlădescu²,

Geanta³

et al. 2021

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In this paper, a novel biocompatible alloy defined as FeMoTaTiZr was obtained and functionalized by hydroxyapatite-based coatings (HAP) in order to increase their biocompatibility, bioactivity, and resistance to corrosion for to be used as bone implants. To obtain the surface with antibacterial properties, the HAP coatings were doped with small amount of Zn. The alloy was prepared using the VAR (Vacuum Arc Remelting) equipment, while the coatings by RF magnetron sputtering method. The EDS analysis confirmed the presence of Ca and P in the case of all developed coatings, having Ca/P or Ca/(P+Zn) ratio of about 1.70 and 1.66, respectively. The XRD and ATR-FTIR investigations confirmed the presence of calcium phosphate phases. The roughness of uncoated substrates increased after coating with HAP, and it was considerably increased by the Zn addition. The electrochemical tests showed that the un-doped HAP exhibited good corrosion behavior, while Zn doped HAP coatings have a high dissolution rate in fetal bovine serum, being more proper as a biodegradable material.

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Comparative study of the hydroxyapatite coatings prepared with/without substrate bias

Cited by 15 publications

References 33 publications

In Vitro Corrosion of Titanium Nitride and Oxynitride-Based Biocompatible Coatings Deposited on Stainless Steel

In Vitro Corrosion of Titanium Nitride and Oxynitride-Based Biocompatible Coatings Deposited on Stainless Steel

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

Bio-Functionalization of a Novel Biocompatible High Entropy Alloy Used For Bone Implants

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