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Surface engineering of timet 550 with oxygen to form a rutile-based, wear-resistant coating

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Abstract

Recently, a thermal oxidation (TO) technique has been successfully developed and applied to the titanium alloy Ti-6Al-4V. This TO technique produces a thin, hard, rutile-based, wear-resistant coating on the surface of the titanium alloy, thus significantly improving the tribological properties of the titanium alloy. In the present investigation, the same principle has been applied to the α+β high-strength titanium alloy Timet 550. A series of TO treatments have been carried out in air within the temperature range of 600 °C to 650 °C. This developed a rutile-based coating which greatly improved the tribological properties of Timet 550. Systematic characterization of the TO-treated surface was carried out using glow-discharge optical emission spectroscopy (GDS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution scanning electron microscopy (HR-SEM) techniques. Ball-on-disc friction testing was used to show the improvement in tribological properties for Timet 550 when TO treated. The sliding wear resistance of the TO treatment was investigated using an Amsler wear tester, utilizing a counterformal block-on-wheel configuration; the TO-treated Timet 550 was run against a carburized S156 steel with splash oil lubrication. It was found that the wear resistance of the TO-treated Timet 550 was greatly improved.

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Authors and Affiliations

  1. Precision Components Coating, Balzers Ltd., MK7 8AZ, Milton Keynes, United Kingdom

    C. Boettcher (Project Engineer)

  2. the School of Metallurgy and Materials, The University of Birmingham, B15 2TT, Birmingham, United Kingdom

    T. Bell (Hanson Professor of Metallurgy) & H. Dong (Lecturer)

Authors
  1. C. Boettcher
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  2. T. Bell
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  3. H. Dong
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Boettcher, C., Bell, T. & Dong, H. Surface engineering of timet 550 with oxygen to form a rutile-based, wear-resistant coating. Metall Mater Trans A 33, 1201–1211 (2002). https://doi.org/10.1007/s11661-002-0221-3

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  • DOI: https://doi.org/10.1007/s11661-002-0221-3

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