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Sol-gel alumina coatings on stainless steel for wear protection

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Abstract

The aluminium oxide films on austenitic steel are prepared from sols of re-dispersed boehmite nano powders in water. After dip-coating of the sol, a heat treatment including drying, calcination and annealing in vacuum at temperatures up to 1100°C is performed to obtain crack-free coatings of a thickness up to 6 μm. XRD measurements detect α- and γ-alumina, a TiO x -phase at the metal/coating interface and a gradient of phase formation in the coating. The strong adhesion on the substrates is due to the layered assembly and gradient composition of the coating caused by an inter-diffusion of metal cations and oxygen in the metal/oxide interface during heat treatment. Residual stress measurements by X-rays result in compressive stresses of 2–4 GPa in the alumina coatings. The pin-on-disc test shows a remarkable improvement of wear resistance obtained by sol-gel coatings. The α-alumina content and the compressive stress of the coatings correlate with wear resistance of the coatings.

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Authors and Affiliations

  1. Federal Institute for Materials Research and Testing (BAM), D-12200, Berlin, Germany

    Thomas Hübert

  2. University of Applied Sciences Schmalkalden, D-98574, Schmalkalden

    Jack Schwarz & Bernd Oertel

Authors
  1. Thomas Hübert
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  2. Jack Schwarz
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  3. Bernd Oertel
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Correspondence to Thomas Hübert.

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Hübert, T., Schwarz, J. & Oertel, B. Sol-gel alumina coatings on stainless steel for wear protection. J Sol-Gel Sci Technol 38, 179–184 (2006). https://doi.org/10.1007/s10971-006-6470-7

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  • DOI: https://doi.org/10.1007/s10971-006-6470-7

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