The relative wear resistance of three candidate coatings for titanium alloy-based orthopedic applications was compared using a reciprocating test method. Micrometer-sized powders of the following compositions were plasma sprayed onto Ti-6Al-4V (TAV) alloy: (i) Al2O3 (AO), (ii) 8mol% yttria stabilized zirconia (8YSZ) and (iii) Al2O3-40wt% 8YSZ (A4Z). Deposits were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and porosity measurements. In addition, microindentation hardness measurements and scratch-based adhesive/cohesive strength measurements were also performed. The composite coating (A4Z) had superior wear resistance. Wear track examination suggests two reasons for this improvement. First, the A4Z coating had improved cohesive strength between splats, and second, there was a phase transition toughening mechanism associated with tetragonal zirconia. Results of contact mechanics calculations support the experimental findings. © 2014 Elsevier B.V.

Geetha M

Department of Control and Automation

School of Electrical Engineering

Vellore Campus

Perumal G

Asokamani R

Alagumurthi N.

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

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 reports the wear characteristics of the ceramic coatings made with Al2O3 and also with SiC which were performed using atmospheric plasma spraying technique on the Ti-6Al-4V biomedical alloy with the aim of improving their tribological behavior. The wear behavior of the coatings was evaluated using reciprocatory wear tester with coated substrate as the flat and alumina ball as a friction partner in simulated body fluid (Hank's solution) environment. The microstructure and phase composition of the ceramic powders and as-sprayed coatings have been characterized using scanning electron microscope and X-ray diffractometer. Porosity, microhardness, adhesion strength and roughness of the coatings were measured as they have a bearing on wear and friction behavior. The results indicate that plasma sprayed Al2O 3 coating exhibits higher wear resistance compared to that of plasma sprayed SiC coating. The higher wear resistance of Al2O3 coating is attributed to the improved melting and spreading of the alumina particles onto the substrate yielding increasingly bonded splats, resulting in compact and dense microstructure with lower porosity and higher microhardness. © 2013 Indian Institute of Metals.

Transactions of the Indian Institute of Metals

A comparative Study on the Wear Behavior of Al2O3 and SiC Coated Ti-6Al-4V Alloy Developed Using Plasma Spraying Technique

Nanoscience and Nanotechnology Letters

Size Effect of Yttria Stabilized Zirconia Addition on Fracture Toughness and Thermal Conductivity of Plasma Sprayed Aluminum Oxide Composite Coatings

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.

Sliding wear behavior of plasma sprayed nanoceramic coatings for biomedical applications

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

Journal of Artificial Organs

Acknowledgment to reviewers

Wear studies on plasma sprayed Al2O3–40wt% 8YSZ composite ceramic coating on Ti–6Al–4V alloy used for biomedical applications

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