Improvement of the Tribological Properties of Alumina Coatings by Zirconia Addition

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.

Unravelling the room temperature growth of two-dimensional h-BN nanosheets for multifunctional applications

“…These results are in good agreement with conventionally fabricated h-BN nanosheets and other 2D materials. 52–54 Overall, the observed hydrophobic nature and lubricity of the h-BN nanosheets would be useful for the coating industry.…”

Tribological Properties and Lubrication Mechanisms of Water-Based Nanolubricants Containing TiO2 Nanoparticles during Micro Rolling of Titanium Foils

“…This phenomenon can be explained by the aggregated nanoparticles [ 34 ]. In general, excessive nanoparticles can lead to increased friction, thereby increasing the COF and leading to an increase in rolling force [ 35 ].…”

“…This phenomenon can be explained by the aggregated nanoparticles [34]. In general, excessive nanoparticles can lead to increased friction, thereby increasing the COF and leading to an increase in rolling force [35]. The surface roughness of titanium foils after rolling with various lubrication conditions is shown in Figure 5.…”