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Enhancement of High Temperature Frictional Properties of Nanostructured Hard Anodized Coatings by PTFE Solid Lubricant

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Abstract

Hard anodized aluminum substrate in sulfuric acid electrolyte was produced and surface hardness and frictional properties of the coated surface were enhanced employing PTFE particles as lubricant. Field emission scanning electron microscope images of anodized layer showed distribution of nano-pores within the surface of high microhardness. Grazing incidence x-ray diffraction patterns revealed the amorphous structure of alumina. Various values of PTFE suspension containing 200–220 nm particles were applied on the hard anodized coating in order to enhance frictional properties. In order to improve PTFE layer adhesion, heat treatment was employed. Pin-on-disc wear tests were performed with AISI 52100 steel pins to study the tribological behavior of the specimens at room and intermediate temperatures. Experimental results indicate that the sample containing 30 ml/l PTFE has the lowest coefficient of friction at ambient temperature; while at 300 °C, a suspension containing 20 ml/l PTFE produces the optimum condition.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 8415683111, Iran

    Saeed Shirmohammadi Yazdi & Fakhreddin Ashrafizadeh

  2. Steel Institute, Isfahan University of Technology, Isfahan, 8415683111, Iran

    Fatemeh Ebrahimi

Authors
  1. Saeed Shirmohammadi Yazdi
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  2. Fatemeh Ebrahimi
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  3. Fakhreddin Ashrafizadeh
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Correspondence to Fatemeh Ebrahimi.

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Shirmohammadi Yazdi, S., Ebrahimi, F. & Ashrafizadeh, F. Enhancement of High Temperature Frictional Properties of Nanostructured Hard Anodized Coatings by PTFE Solid Lubricant. Trans Indian Inst Met 71, 1507–1518 (2018). https://doi.org/10.1007/s12666-018-1286-z

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