Abstract
Al2O3 and Al2O3-ZrO2 coatings were deposited on stainless steel using atmospheric plasma spraying. The influence of arc current and zirconia addition on the surface morphology of the coating, phase composition and tribological properties under dry sliding conditions were investigated. The addition of zirconia reduced the surface roughness of the coatings. The X-ray diffraction measurements indicated that the Al2O3 coatings were composed of β-Al2O3, α-Al2O3, and γ-Al2O3 phases. The addition of zirconia led to the formation of tetragonal and monoclinic phases of zirconia in the as-sprayed coatings. The friction coefficients of Al2O3 and Al2O3-ZrO2 coatings were similar and varied in the range of 0.72–0.75. The specific wear rates of the as-sprayed coatings were reduced with the increase of arc current. It was obtained that the wear rates of the Al2O3-ZrO2 coatings were at least three times lower compared to Al2O3 coatings.
Highlights
Aluminum oxide coatings have received wide attention because of their good mechanical and tribological properties, high resistance to thermal degradation and corrosion and a low electrical conductivity
The main aim of this research was to investigate the influence of arc current and zirconia addition on the surface
Alumina and alumina-zirconia coatings were formed by atmospheric plasma spraying using an air-hydrogen plasma
Summary
Aluminum oxide coatings have received wide attention because of their good mechanical and tribological properties, high resistance to thermal degradation and corrosion and a low electrical conductivity. These excellent properties allow alumina to be used in various fields like wear or corrosion protection of metal surfaces [1,2,3,4,5,6]. Despite their high hardness, the alumina coatings are brittle and have relatively high friction coefficients under dry sliding conditions.
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