scholarly journals Bio-Functional Coating on Ti6Al4V Surface Produced by Using Plasma Electrolytic Oxidation

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1124
Author(s):  
Aqmar Zakaria ◽  
Hamdi Shukor ◽  
Masahiro Todoh ◽  
Kamaruzaman Jusoff
Keyword(s):  
Dental Implants ◽  
Plasma Electrolytic Oxidation ◽  
Energy Dispersive Spectrometer ◽  
Antibacterial Properties ◽  
Functional Surface ◽  
Functional Coating ◽  
Fluoridated Hydroxyapatite ◽  
Coating Surface ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

One way to improve the biofunctionality of titanium alloys is by implementing plasma electrolytic oxidation (PEO) to incorporate bioactive elements such as fluoridated hydroxyapatite, into surface coatings of orthopaedic and dental implants. Hydroxyapatite (HAp) is known as a bioactive coating while fluorapatite (FAp) has an antibacterial effect that would enhance the bio-functionality and reduce the failure rate of orthopaedic and dental implants. The purpose of this study was to develop fluoridated hydroxyapatite as a bio-functional coating on Ti6Al4V with electrolyte containing trisodium orthophosphate, potassium hydroxide, and calcium fluoride. The coating surface and cross-section morphologies were evaluated, and the species in the electrolyte solution were found, and irregular micropores shapes were observed by field emission scanning electron microscopy (FESEM) and energy dispersive spectrometer (EDS). The phase composition of the coating surface containing TiO2 (anatase and rutile), tricalcium orthophosphate, HAp, and FAp was characterized by X-ray diffractometer (XRD). The adhesive strength of the coating was analysed by a micro-scratch test. Simulated body fluid (SBF) immersion test was performed to investigate the bioactivity of the coating. In this study, we demonstrated that the PEO technique has a good potential to develop bio-functional surface modifications that can affect the chemical composition and roughness of the coating surface. The FAp coating may provide insights for subsequent bioactive coatings while improving the antibacterial properties for orthopaedic and dental implants. Future work shall investigate the optimal amount of fluoride in the coating layer that obtains excellent results without causing adverse effects on adjacent tissue.

scholarly journals A Comparative Study of Hydroxyapatite Coating Produced with Plasma Electrolytic Oxidation and Hydrothermal Treatment on Titanium Alloys: Ti6Al4V and Ti6Al7Nb for Dental Implants

2018 ◽  
Author(s):  
Elinor Nahum ◽  
Svetlana Lugovskoy
Keyword(s):  
Dental Implants ◽  
Plasma Electrolytic Oxidation ◽  
Water Solution ◽  
Thickness Gauge ◽  
Solution Ph ◽  
Ti Alloys ◽  
Electrolytic Oxidation ◽  
Water Ph ◽  
Mechanical Properties And Corrosion ◽  
Plasma Electrolytic

Ti and Ti alloys are materials usually used in contact with hard tissue for applications such as artificial joints and dental implants. Ti6Al4V is a very common alloy used for dental implants, owing to its good mechanical properties and corrosion resistance. Nevertheless, because of uncertainties regarding the toxicity of vanadium and its influence on the human body, other Ti alloys containing no vanadium and retaining suitable properties are used. In this work Ti6Al4V and Ti6Al7Nb were oxidized in a water solution of calcium acetate (Ca(CH3COO)2) and calcium glycerophosphate (Ca(PO4CH(CH2OH)2) by Plasma Electrolytic Oxidation (PEO) for 20 minutes and then were hydrothermally treated (HTT) in water (pH=7) and in potassium hydroxide (KOH) solution (pH=11) for 2 hours at 200°C in a pressurized reactor. The surface morphologies, elemental composition and phase components were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and X-Ray Diffraction (XRD), respectively. The surface roughness was measured by Atomic Force Microscope (AFM) and thickness measurements were made by SEM and thickness gauge. Also, corrosion tests were made to evaluate the corrosion behavior of the two alloys. The aim of this study is to compare two viable Ti alloys, Ti6Al4V and Ti6Al7Nb, and to attain on their surface hydroxyapatite (HA) coating improving the osseointegration, as it simulates a human bone.

DC plasma electrolytic oxidation treatment of gum metal for dental implants

2019 ◽  
Vol 302 ◽  
pp. 10-20 ◽  
Author(s):  
Maciej Sowa ◽  
Michał Parafiniuk ◽  
Catarina M.S. Mouzêlo ◽  
Alicja Kazek-Kęsik ◽  
Ivan S. Zhidkov ◽  
...  
Keyword(s):  
Dental Implants ◽  
Plasma Electrolytic Oxidation ◽  
Dc Plasma ◽  
Oxidation Treatment ◽  
Electrolytic Oxidation ◽  
Gum Metal ◽  
Plasma Electrolytic

scholarly journals TiO2Deposition on AZ31 Magnesium Alloy Using Plasma Electrolytic Oxidation

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Leon White ◽  
Youngmi Koo ◽  
Yeoheung Yun ◽  
Jagannathan Sankar
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Electrochemical Impedance ◽  
Protective Layer ◽  
Az31 Magnesium Alloy ◽  
Treatment Technique ◽  
Functional Coating ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Plasma electrolytic oxidation (PEO) has been used in the past as a useful surface treatment technique to improve the anticorrosion properties of Mg alloys by forming protective layer. Coatings were prepared on AZ31 magnesium alloy in phosphate electrolyte with the addition of TiO2nanoparticles using plasma electrolytic oxidation (PEO). This present work focuses on developing a TiO2functional coating to create a novel electrophotocatalyst while observing the surface morphology, structure, composition, and corrosion resistance of the PEO coating. Microstructural characterization of the coating was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) followed by image analysis and energy dispersive spectroscopy (EDX). The corrosion resistance of the PEO treated samples was evaluated with electrochemical impedance spectroscopy (EIS) and DC polarization tests in 3.5 wt.% NaCl. The XRD pattern shows that the components of the oxide film include Mg from the substrate as well as MgO and Mg2TiO4due to the TiO2nanoparticle addition. The results show that the PEO coating with TiO2nanoparticles did improve the corrosion resistance when compared to the AZ31 substrate alloy.

Structrure of Al2O3 Ceramic Coating on Super Alloy Prepared by Cathodic Plasma Electrolytic Oxidation

2013 ◽  
Vol 690-693 ◽  
pp. 2137-2140 ◽  
Author(s):  
Yun Long Wang ◽  
Miao Wang ◽  
Yue Mei Qin ◽  
Xing Feng Shi ◽  
Hui Rong Guo ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Plasma Electrolytic Oxidation ◽  
Ceramic Coating ◽  
Coating Surface ◽  
Electrolytic Oxidation ◽  
Coarse Surface ◽  
Cathodic Plasma ◽  
Plasma Electrolytic ◽  
Super Alloy

Al2O3ceramic coating was successfully prepared on GH132 super alloy by cathodic plasma electrolytic oxidation in (NO3)3·9H2O electrolyte. The structure and chemical composition of the coatings were characterized. The results showed that the as prepared coating was composed of Al2O3crystal, including much α-Al2O3andsomeγ-Al2O3two types of Al2O3.A few Fe elements entered into in the substrate and nearly no other elements were found in the coating surface. The Al2O3.coating showed coarse surface and there were some small pits on the surface. The diameters of pits were not more than 20 um. The thickness of coating was about 50μm.

Enhancement of Corrosion Resistance of PEO Coating on AZ91 Biomedical Magnesium Alloy by Surface Laser Treating

2013 ◽  
Vol 365-366 ◽  
pp. 1110-1113 ◽  
Author(s):  
Miao Wang ◽  
Yun Long Wang ◽  
Zhong De Liu ◽  
Hua Ding
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Ceramic Coating ◽  
Alloy Sample ◽  
Corrosion Tests ◽  
Coating Surface ◽  
Electrolytic Oxidation ◽  
Surface Laser ◽  
Plasma Electrolytic

Ceramic coating was fabricated on AZ91 biomedical magnesium alloy by plasma electrolytic oxidation. The coating was then subjected to surface laser treating, and the influence of laser treating on the morphologies and corrosion resistance of the coating were investigated. The results showed that PEO coating without laser treating showed coarse and porous surface and the pores on coating surface were big. When subjected to laser treating, the pores on coating surface became little and few. The corrosion tests in SBF indicated that corrosion resistance of PEO coating on magnesium alloy sample could improve the corrosion resistance of the substrate, and surface laser treating could further increase the corrosion resistance.

Fabrication and Microstructure of HA Containing Composite Coating on AZ91 Biomedical Magnesium by Plasma Electrolytic Oxidation

2013 ◽  
Vol 575-576 ◽  
pp. 229-232
Author(s):  
Miao Wang ◽  
Yun Long Wang
Keyword(s):  
Phase Composition ◽  
Magnesium Alloy ◽  
Surface Morphology ◽  
Composite Coating ◽  
Plasma Electrolytic Oxidation ◽  
Coating Surface ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Composite coating containing HA was fabricated on AZ91 biomedical magnesium alloy by plasma electrolytic oxidation in aluminate electrolyte with HA power in electrolyte. The microstructure of the coating including phase composition and surface morphology was investigated. The results showed that the coating consisted of MgO and MgAl2O4and some HA. The whole coating surface was covered by many micro-pores but the surface are relatively uniform. The diameters of most pores were below 5um, and a few pores were bigger than 10 um.

scholarly journals Fabrication of a Novel Ta(Zn)O Thin Film on Titanium by Magnetron Sputtering and Plasma Electrolytic Oxidation for Cell Biocompatibilities and Antibacterial Applications

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 649
Author(s):  
Heng-Li Huang ◽  
Ming-Tzu Tsai ◽  
Yin-Yu Chang ◽  
Yi-Jyun Lin ◽  
Jui-Ting Hsu
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Cell Viability ◽  
Plasma Electrolytic Oxidation ◽  
Tantalum Oxide ◽  
Antibacterial Properties ◽  
Pure Titanium ◽  
Antibacterial Performance ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Pure titanium (Ti) and titanium alloys are widely used as artificial implant materials for biomedical applications. The excellent biocompatibility of Ti has been attributed to the presence of a natural or artificial surface layer of titanium dioxide. Zinc oxide and tantalum oxide thin films are recognized due to their outstanding antibacterial properties. In this study, high power impulse magnetron sputtering (HiPIMS) was used for the deposition of tantalum oxide and zinc-doped Ta(Zn)O thin films on Ti with rough and porous surface, which was pretreated by plasma electrolytic oxidation (PEO). Surface morphology, antibacterial property as well as cell biocompatibility were analyzed. The antibacterial effect was studied individually for the Gram-positive and Gram-negative bacteria Staphylococcus aureus (S. aureus) and Actinobacillus actinomycetemcomitans (A. actinomycetemcomitans). The deposited Ta (Zn)O coating was composed of amorphous tantalum oxide and crystalline ZnO. The antibacterial results on the tantalum oxide and Ta(Zn)O coated Ti indicated a significant inhibition of both S. aureus and A. actinomycetemcomitans bacteria when compared with the uncoated Ti samples. The deposited Ta(Zn)O showed the best antibacterial performance. The Ta(Zn)O coated Ti showed lower level of the cell viability in MG-63 cells compared to other groups, indicating that Zn-doped Ta(Zn)O coatings may restrict the cell viability of hard tissue-derived MG-63 cells. However, the biocompatibility tests demonstrated that the tantalum oxide and Ta(Zn)O coatings improved cell attachment and cell growth in human skin fibroblasts. The cytotoxicity was found similar between the Ta2O5 and Ta(Zn)O coated Ti. By adopting a first PEO surface modification and a subsequent HiPIMS coating deposition, we synthetized amorphous tantalum oxide and Ta(Zn)O coatings that improved titanium surface properties and morphologies, making them a good surface treatment for titanium-based implants.

scholarly journals In Vitro Biological Characterization of Silver-Doped Anodic Oxide Coating on Titanium

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4359
Author(s):  
Oleksandr Oleshko ◽  
Iryna Liubchak ◽  
Yevheniia Husak ◽  
Viktoriia Korniienko ◽  
Aziza Yusupova ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Ag Nanoparticles ◽  
Plasma Electrolytic Oxidation ◽  
Antibacterial Properties ◽  
Phosphate Solution ◽  
Implant Surface ◽  
Collagen Production ◽  
Dental Implant Surface ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Despite the high biocompatibility and clinical effectiveness of Ti-based implants, surface functionalization (with complex osteointegrative/antibacterial strategies) is still required. To enhance the dental implant surface and to provide additional osteoinductive and antibacterial properties, plasma electrolytic oxidation of a pure Ti was performed using a nitrilotriacetic acid (NTA)-based Ag nanoparticles (AgNP)-loaded calcium–phosphate solution. Chemical and structural properties of the surface-modified titanium were assessed using scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) and contact angle measurement. A bacterial adhesion test and cell culture biocompatibility with collagen production were performed to evaluate biological effectiveness of the Ti after the plasma electrolytic process. The NTA-based calcium–phosphate solution with Ag nanoparticles (AgNPs) can provide formation of a thick, porous plasma electrolytic oxidation (PEO) layer enriched in silver oxide. Voltage elevation leads to increased porosity and a hydrophilic nature of the newly formed ceramic coating. The silver-enriched PEO layer exhibits an effective antibacterial effect with high biocompatibility and increased collagen production that could be an effective complex strategy for dental and orthopedic implant development.

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