This paper reports on the corrosion and scratch behavior of TiO 2 + 50%HAp nanoceramic coated Ti-13Nb-13Zr orthopedic implant alloy. An adherent thin coating was obtained using the electrophoretic deposition (EPD) technique at 30 V and sintering at 850 °C. The microstructure of the coated surfaces was characterized by optical microscopy, AFM, and SEM, and the composition of the coating was examined using EDAX. The functional groups and formed phases analyzed using FT-IR, and XRD. Further, the adhesion strength of the coatings was evaluated using scratch tester and the corrosion behavior of all samples was tested in Simulated Body Fluid (SBF-Hank's solution) using a potentiodynamic polarization studies. The sintered coating exhibited higher adhesion, lower porosity and higher density compared to unsintered samples, and higher corrosion resistance compared to the substrate. However, the corrosion resistance of the unsintered coating was superior to that of the sintered one due to the presence of minimal interconnected porosity. © 2011 Elsevier Ltd and Techna Group S.r.l.

Geetha M

Department of Control and Automation

School of Electrical Engineering

Vellore Campus

Mohan L

Durgalakshmi D

Sankara Narayanan T.S.N

Asokamani R.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Ceramics International

Synthesized composite powders (ZrO 2 /TiO 2 , SiO 2 /TiO 2 , and SiO 2 /ZrO 2 ) were successfully deposited on Ti–6Al–4V by electrophoretic deposition method (EPD) to improve its electrochemical characteristics for better biomedical applications. In the present investigation, the three composite powders were prepared by sol–gel synthesis and its phase purity was analyzed by Powder X-ray diffraction (XRD) method. Further, the performance of the deposited coatings was assessed by scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDAX), scratch resistance test. The electrochemical properties of the composite coatings were analyzed by Potentiodynamic (Tafel) polarization and electrochemical impedance spectroscopy (EIS) studies. From the results, we observed that the corrosion resistance behavior of the different composite coated metallic substrate exhibited divergent corrosion resistance nature than blank Ti–6Al–4V. Of all these coatings on Ti–6Al–4V, the composite made up of, ZrO 2 /TiO 2 has pronounced corrosion resistance behavior in Ringer's solution when compared to others. This behavior is due to the presence of strong adherent coating owing to the existence of uniform deposition on Ti–6Al–4V. © 2017 The Ceramic Society of Japan and the Korean Ceramic Society

Fulltext

Journal of Asian Ceramic Societies

Improved corrosion resistant and mechanical behavior of distinct composite coatings (silica/titania/zirconia) on Ti–6Al–4V deposited by EPD

Hydroxyapatite (HAP) has tremendous applications in orthopaedics and dentistry fields due to its enhanced biocompatibility and bioactivity. In the present investigation, ethanol-based HAP nanoparticles (NPs) are prepared by sol–gel method using calcium nitrate tetrahydrate and triethyl phosphite, without using any additives or chelating agents. The sol–gel-derived HAP NPs were characterised using FT-IR, XRD, TGA-DTA, SEM-EDAX, ICP-OES and TEM analyses. In vitro cytocompatibility assessment of different concentrations of HAP NPs (200–1000 μg/ml) was performed using cultured NIH-3T3 fibroblast cell for 24–48 h. The results indicated that HAP NPs did not have any cytotoxic effects on NIH-3T3 cells. Further to this study, sol–gel-derived HAP sol was coated as triple layers on the Ti-6Al-4V by spin coating technique and the developed coatings were characterised by SEM-EDAX to determine the surface uniformity, chemical composition and thickness. The surface wettability of the coatings was observed by contact angle measurements. In vitro corrosion test was carried out in SBF solution and confirms that triple layer HAP coatings derived at 3000 RPM and sintered at 500 °C for 2 h exhibit higher corrosion resistance behaviour. This in vitro corrosion study predicts the suitability of the coatings for its long-term applications in medical field. In vitro cytocompatible study proves that HAP coatings on Ti-6Al-4V play a significant role in the enhancement of cell viability with prominent cellular response. © 2017 Informa UK Limited, trading as Taylor &amp; Francis Group.

Materials Technology

Preparation and characterisation of sol–gel-derived hydroxyapatite nanoparticles and its coatings on medical grade Ti-6Al-4V alloy for biomedical applications

In this study, nanocomposite powder consisting of zirconia and titania (Zr-Ti) have been synthesised by sol-gel method, with the aim of protecting Ti-6Al-4V surface. A simple and low cost electrophoretic deposition (EPD) technique has been employed for coating the nanocomposite material on Ti-6Al-4V. The prepared nanocomposite powder was characterised for its functional groups, phase purity, surface topography by Fourier transform infrared spectroscopy, powder X-ray diffraction and scanning electron microscopy. Further, the biocompatibility nature of the composite powder was studied by [3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide] colorimetric assay and fluorescence analysis with MG63 osteoblast cell lines. The electrochemical behaviour of composite coating was investigated by potentiodynamic polarization and electrochemical impedance method. The results obtained from the electrochemical techniques indicate more corrosion resistance behaviour with increase of Rct value with the corresponding decrease in Rdl values. From the above findings, the composite coating acts as a barrier layer against corrosion by preventing the leaching of metal ions from a dense and defect free coating. A scratch test analyser was used to assess the integrity of the coating; the lower traction force value of composite coating with increase in load has confirmed the presence of thick adherent layer on the substrate. © The Institution of Engineering and Technology 2016.

IET Nanobiotechnology

In-situ fabrication of zirconium–titanium nano-composite and its coating on Ti-6Al-4V for biomedical applications

Current advances in enhancement of wear and corrosion resistance of titanium alloys – a review

The purpose of this study is to prepare and evaluate the effect of synthesized titanium dioxide (TiO2) nanoparticles for their biocompatibility on physiological body fluids and the effect of cell toxicity to produce osteointegration when used as implantable materials. For the past few decades, the number of researches done to understand the importance of the biocompatibility of bioceramics, metals, and polymers and their effect on clinical settings of biomedical devices has increased. Hence, the total concept of biocompatibility encourages researchers to actively engage in the investigation of the most compatible materials in living systems by analyzing them using suitable physical, chemical, and biological (bioassay) methods. The ceramic material nano TiO2 was prepared by sol-gel method and analyzed for its functional group and phase formation by Fourier transform infrared spectroscopy and powder X-ray diffraction. Furthermore, the particle size, shape, surface topography, and morphological behavior were analyzed by dynamic light scattering, zeta potential, scanning electron microscopy-energy dispersive X-ray analysis, and transmission electron microscopy analysis. In addition to this, the cytotoxicity and cytocompatibility were determined on MG63 cell lines with varying doses of concentrations such as 1 µg/mL, 10 µg/mL, 25 µg/mL, 50 µg/mL, and 100 µg/mL with different time periods such as 24 hours and 48 hours. The results have not shown any toxicity, whereas, it improved the cell viability/proliferation at various concentrations. Hence, these findings indicate that the nano TiO2 material acts as a good implantable material when used in the biomedical field as a prime surface-modifying agent. © 2015 Chellappa et al.

International Journal of Nanomedicine

Preparation and evaluation of the cytotoxic nature of TiO2 nanoparticles by direct contact method

The field of biomaterials has become a vital area, as these materials can enhance the quality and longevity of human life and the science and technology associated with this field has now led to multi-million dollar business. The paper focuses its attention mainly on titanium-based alloys, even though there exists biomaterials made up of ceramics, polymers and composite materials. The paper discusses the biomechanical compatibility of many metallic materials and it brings out the overall superiority of Ti based alloys, even though it is costlier. As it is well known that a good biomaterial should possess the fundamental properties such as better mechanical and biological compatibility and enhanced wear and corrosion resistance in biological environment, the paper discusses the influence of alloy chemistry, thermomechanical processing and surface condition on these properties. In addition, this paper also discusses in detail the various surface modification techniques to achieve superior biocompatibility, higher wear and corrosion resistance. Overall, an attempt has been made to bring out the current scenario of Ti based materials for biomedical applications.

Progress in Materials Science

Ti based biomaterials, the ultimate choice for orthopaedic implants – A review

Composites Science and Technology

Controlled growth and investigations on the morphology and mechanical properties of hydroxyapatite/titania nanocomposite thin films

Journal of Nanoparticle Research

Biocorrosion studies of TiO2 nanoparticle-coated Ti–6Al–4V implant in simulated biofluids

IFMBE Proceedings 13th International Conference on Biomedical Engineering

Synthesis and Characterization of TiO2+HA Coatings on Ti-6Al-4V Substrates by Nd-YAG Laser Cladding

Journal of the European Ceramic Society

Production and characterization of plasma-sprayed TiO2–hydroxyapatite functionally graded coatings

Electrophoretic deposition of nanocomposite (HAp+TiO2) on titanium alloy for biomedical applications

Journal	Data powered by TypesetCeramics International
Publisher	Data powered by TypesetElsevier BV
ISSN	0272-8842
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