STP1563

    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

    Published: May 2013


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    Abstract

    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 %O2) were used as substrates in the current work. Both were coated with conventional and nano-ceramic materials of Al2O3-TiO2. Bilayered coatings of ZrO2+Al2O3-13 %TiO2 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.

    Keywords:

    detonation gun, Al, 2, O, 3, -13 %TiO, 2, coatings, Ti-13Nb-13Zr alloy, SEM, EIS, plasma spray, Gum metal, tribocorrosion


    Author Information:

    Rathore, P. S.
    School of Mechanical and Building Science, VIT Univ., Vellore,

    Gulati, Sidhant
    School of Mechanical and Building Science, VIT Univ., Vellore,

    Li, Duanjie
    Dept. of Mechanical Engineering, Univ. of Saskatchewan, Saskatoon, Saskatchewan

    Manivasagam, Geetha
    School of Mechanical and Building Science, VIT Univ., Vellore,

    Aruna, S. T.
    National Aerospace Laboratory, Bangalore,

    Joshi, S. V.
    International Advance Research Centre (ARCI), Hyderabad,

    Szpunar, J. A.
    Dept. of Mechanical Engineering, Univ. of Saskatchewan, Saskatoon, Saskatchewan


    Paper ID: STP156320120059

    Committee/Subcommittee: G02.40

    DOI: 10.1520/STP156320120059


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