This paper reports on the sliding wear performance of the nanostructured Al2O3-13TiO2, ZrO2 and the bilayered (ZrO2/Al2O3-13TiO2) coated biomedical Ti-13Nb-13Zr alloy in simulated body fluid condition. The nanopowders were sprayed using an atmospheric plasma spray technique and the reciprocatory sliding wear behavior of all the above coatings was evaluated using wear testing machine. The bilayered (ZrO2/Al2O3-13TiO2) coating which has not been reported hitherto exhibited two hundred and five hundred fold increase in the wear resistances when compared with that of the nanostructured Al2O3-13TiO2 (AT) and ZrO2 (YSZ) coatings. This substantial improvement in the wear resistance of the bilayered coating is attributed to its lower porosity and higher adhesion strength when compared to the AT and YSZ coatings. This study suggests that this new type of bilayered coating may be a preferred approach to be tried for obtaining much higher wear resistant coatings. © 2011 Elsevier B.V.

Sathish A-S

VIT Business School

Chennai Campus

Geetha M

Department of Control and Automation

School of Electrical Engineering

Vellore Campus

Aruna S.T

Balaji N

Rajam K.S

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

Wear

ACS Biomaterials Science & Engineering

Enhanced Tribocorrosion Resistance of Hard Ceramic Coated Ti-6Al-4V Alloy for Hip Implant Application: In-Vitro Simulation Study

Materials Technology

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

ZrO2, Al2O3, ZrO2/Al2O3 and Al2O3/ZrO2 coatings were fabricated on low carbon steel using atmospheric plasma spraying technique. The microstructure and phase composition of the as-sprayed coatings were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The polarization test, salt spray test and immersion test were used to investigate the corrosion behavior of the coatings in 3.5% NaCl solution. The results suggested that the bilayered Al2O3/ZrO2 coating exhibits superior corrosion resistance when compared with the other coatings. This is ascribed to the presence of very few interconnected pores and stable phases in the coating. © 2016 The Nonferrous Metals Society of China

Transactions of Nonferrous Metals Society of China

Comparative study on corrosion behavior of plasma sprayed Al2O3, ZrO2, Al2O3/ZrO2 and ZrO2/Al2O3 coatings

Fulltext

International Journal of Nanomedicine

Wear studies on plasma-sprayed Al2O3 and 8mole% of Yttrium-stabilized ZrO2 composite coating on biomedical Ti-6Al-4V alloy for orthopedic joint application

This paper deals with the fabrication of ZrO2, Al2O3, ZrO2/Al2O3 and Al2O3/ZrO2 coatings on 304 stainless steel substrate by atmospheric plasma spraying. The microstructure and phase composition of the as-sprayed coatings were examined by scanning electron microscopy and X-ray diffraction. Hardness measurements were carried out using a Vickers hardness testing machine. Corrosion behaviour of the coatings was studied by salt spray testing in a mist of 5 wt% NaCl. Results indicate that the bilayered Al2O3/ZrO2 coating exhibits superior corrosion resistance when compared with that of the other coatings and this is ascribed to the presence of dense microstructure with very few pores in the coating. © 2015 Indian Ceramic Society.

Transactions of the Indian Ceramic Society

Microstructure and Corrosion Behaviour of Plasma Sprayed Bilayered Ceramic Coatings

Biomedical Ti alloys are prone to undergo degradation due to the combined effect of wear and corrosion. To overcome these problems, surface modification techniques are being used. In this paper, the biomedical Ti alloy Ti-13Nb-13Zr was plasma sprayed with nanostructured Al2O3-13 wt%TiO2, yttria stabilized zirconia powders and bilayer containing alternate layers of the two coatings to improve the corrosion resistance and microhardness of the substrate. The plasma sprayed coatings were characterized by X-ray diffraction, scanning electron microscopy and Raman spectroscopy. The microstructure, microhardness and surface roughness of the coatings were investigated. The corrosion resistance of the coatings was studied in simulated body conditions. The results show improved corrosion resistance for the bilayered coating compared to the individual plasma sprayed coatings on biomedical Ti-13Nb-13Zr alloy substrate. © 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Ceramics International

Studies on plasma sprayed bi-layered ceramic coating on bio-medical Ti–13Nb–13Zr alloy

The effects of laser nitriding on surface hardness, corrosion and wear behavior of the conventional biomedical implants such as commercially available pure titanium and Ti-13Nb-13Zr alloy is reported. The influence of alloying elements such as Zr and Nb on nitride formation was also studied by nitriding the newly developed alloy (Ti-13Nb-13Zr). The surface modified samples were characterized using optical microscope (OM), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) and X-ray diffraction (XRD) techniques. Corrosion rate, wear rate and coefficient of friction were made under simulated body condition for commercially available pure titanium and Ti-13Nb-13Zr alloy. The high speed processing of these alloys enabled smooth and crack free surface. © 2009 Elsevier B.V. All rights reserved.

Materials Science and Engineering: C

Studies on the corrosion and wear behavior of the laser nitrided biomedical titanium and its alloys

Surface treatments and coatings are the practical approaches used to extend the lifetime of components and structures especially when the surface is the most solicited part of the considered engineering component. Hard thermally sprayed coating is one of the most wear resistance coating widely used in many practical mechanical applications. In the construction of articulating parts of medical devices, titanium and its alloys have to be surface coated to improve their tribocorrosion behavior. In this way, the use of porous thermal coatings is known to be a strategy for better binding bone or tissue on femoral stem for example. It is, thus, important to evaluate the corrosion and the wear behaviors of such materials for biosecurity considerations in the human body. In this study, we investigate the behavior of new nano ZrO2 and Al2O3-13 wt.% TiO2 thermal sprayed coatings on commercially pure (cp)-Ti (grade 4) and titanium alloy substrates. Friction and wear tests against Al2O3 balls showed that the wear resistance of Al2O3-13 wt.% TiO2 is better than that ZrO2 coating. Both plasma sprayings have similar abrasive wear behavior; however, the average friction coefficient is higher for alumina-titania coating. Electrochemical tests, open circuit potential monitoring and potentiodynamic polarization, were performed in simulated body conditions (Hank's solution, 37 °C). Results showed that corrosion resistance was appreciably higher for alumina-titania coating. © 2009 Elsevier Ltd. All rights reserved.

International Journal of Refractory Metals and Hard Materials

Corrosion and wear behavior of thermally sprayed nano ceramic coatings on commercially pure Titanium and Ti–13Nb–13Zr substrates

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

Surface and Coatings Technology

Abrasive wear behaviour of Si3N4/TiO2 nanocomposite coatings fabricated by plasma electrolytic oxidation

Sliding wear behavior of plasma sprayed nanoceramic coatings for biomedical applications

Journal	Data powered by TypesetWear
Publisher	Data powered by TypesetElsevier BV
ISSN	0043-1648
Open Access	0