Characterization of the Tribological Properties of Bismuth-titanate Coatings Synthesized by Sol-gel on 316L Stainless Steel Substrates

Abstract

The objective of this investigation was to obtain ceramic coatings of bismuth titanate by Sol-gel synthesis on 316L stainless steel substrates using bismuth nitrate pentahydrate (III) and titanium tetrabutoxide as precursors. The characterization focused on determining wear rates, coefficients of friction, adhesion, nano-hardness, and thickness of the coatings, depending on the concentration of the precursors, the speed of rotation and the number of layers. It is concluded that the sol presents favorable conditions for their potential application as coatings on metallic substrates.

Archives of Metallurgy and Materials

“…The following R-parameters (quality of the fitting) were obtained: R p = 18.14%, R wp = 24.36%, R exp = 7.79%. Calculated density of iron nickel was ρ = 8.14 g/cm 3 and calculated elementary cell parameter was a = 3.593 Å. Calculated density of chromferide was ρ = 7.77 g/cm 3 and calculated elementary cell parameter was a = 2.875 Å. Crystallite size was found as follows: for iron nickel phase <D> = 2932 Å and for chromferide phase <D> = 32414 Å, respectively.…”

“…The special properties of stainless steel mean that they can be used as substrates with various geometric shapes for applying coatings. Such coatings can not only improve the corrosion resistance of steel in a variety of aggressive environments, but also act as functional coatings that exhibit properties that cover industrial purposes and meet very specific demands and find unique applications [3]. For example, they can be used in biomedical applications for protection of orthopaedic implants, or improvement of the resistance to wear and tribological properties [4,5].…”