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Comparative studies on tribocorrosion behaviour of plasma-sprayed and detonation gun coatings of Al2O3-13% TiO2 on biomedical alloy Ti-13Nb-13Zr and Gum metal
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2013 (English)In: ASTM Special Technical Publication, 2013, Vol. STP 1563, no January, 88-104 p.Conference paper (Refereed)
Abstract [en]

The tribocorrosion behavior of titanium-based alloys is of significant interest as bio-implant materials. Bare alloys may not offer enough resistance to tribocorrosion, so coatings could be used to improve their performance. An important biomedical alloy, Ti-13Nb-13Zr, and a newly developed β titanium alloy called "Gum metal" (Ti-23%Ni-0.7%Ta-2%Zr-1 %O<inf>2</inf>) were used as substrates in the current work. Both were coated with conventional and nano-ceramic materials of Al<inf>2</inf>O<inf>3</inf>-TiO<inf>2</inf>. Bilayered coatings of ZrO<inf>2</inf>+Al<inf>2</inf>O<inf>3</inf>-13%TiO<inf>2</inf> were also applied to the Ti-13Nb-13Zr using plasma spray. The coatings on Ti-13Nb-13Zr were applied using plasma spray, whereas that on the Gum metal was applied by a detonation gun (D-Gun). Surface morphology was characterized using a scanning electron microscope (SEM). Tribocorrosion experiments were performed in salt water using a linear reciprocating ball-on-plate tribometer with an aluminum ball as the slider. The nano particles are embedded in the fully melted splats and offered better crack propagation resistance. The high velocity of the D-Gun process resulted in a higher volume fraction of the embedded nano particles and produced substantial improvement in wear resistance relative to the air-plasma-sprayed coating. The conventional coating, with its higher porosity, exhibited a high corrosion rate compared to nano coating. The D-Gun coating, with its lower porosity, had a higher corrosion resistance than the plasma-sprayed coating, but bilayered plasma-sprayed coating showed even higher corrosion resistance, owing to its dense microstructure. Open-circuit potential measurements before and during tribocorrosion showed that the bilayered plasma-sprayed coating had better tribocorrosion resistance than the other coatings. Electrochemical impedance spectroscopy indicated stable impedance values for the bilayered plasma-sprayed coating before and after tribocorrosion. Copyright © 2013 by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.

Place, publisher, year, edition, pages
2013. Vol. STP 1563, no January, 88-104 p.
Keyword [en]
Air; Alloys; Aluminum; Aluminum coatings; Ceramic coatings; Ceramic materials; Coated materials; Coatings; Corrosion; Corrosion rate; Corrosion resistance; Detonation; Electrochemical corrosion; Electrochemical impedance spectroscopy; Metals; Nanoparticles; Niobium; Plasma jets; Porosity; Scanning electron microscopy; Sprayed coatings; Stainless steel; Tantalum; Titanium; Titanium alloys; Wear resistance; Zirconium; Zirconium alloys, Detonation gun; EIS; Gum Metal; TiO; Tribo-corrosion; Zr alloys, Plasma spraying
URN: urn:nbn:se:hv:diva-8544DOI: 10.1520/STP156320120059OAI: diva2:860183
3rd International Symposium on Tribo-Corrosion: Research, Testing, and Applications; Atlanta; United States; 19 April 2012 through 20 April 2012; Code 112802
Available from: 2015-10-10 Created: 2015-10-10 Last updated: 2015-10-10Bibliographically approved

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Joshi, S. V.

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