Comparative investigation on thermally sprayed Al₂O₃, Al₂O₃–13%(TiO₂) and Al₂O₃–40%(TiO₂) composite coatings from room to 400 °C temperature

Abstract

In the present study, three coatings of Al2O3, Al2O3-13%(TiO2) and Al2O3-40%(TiO2) composite coatings were deposited by the thermally flame spray process. The comparative wear behaviour of the Al2O3-TiO2 coatings has been studied under high temperature levels up to 400°C with the help of a high temperature tribometer at a constant load of 40N. Prior to the tribo-test, the coating morphology and elemental analysis has been examined with the help of field emission scanning electron microscope (FESEM), elemental dispersion spectroscopy (EDS) and X-ray powder diffraction (XRD) techniques. The Mechanical properties have been also analyzed and reported. The results reveal that specific wear rate decreases with an increase in temperature for all the deposited coating except Al2O3 coating at 400°C. The overall friction coefficient of the coatings is decreasing with the increasing temperature. The Al2O3-40%TiO2 coating showed maximum sustainability against wear as well as a low coefficient of friction because of its low hardness and high adhesion properties. The examined worn surface validates the presence of brittle fracture and abrasive wear behaviour mechanism along with the oxidation wear, from room temperature to 400°C.

Cavitation Erosion and Wet Environment Tribological Behaviour of Al2O3-13% TiO2 Coatings Deposited via Different Atmospheric Plasma Spraying Parameters

“…Furthermore, there are scientific reports systematically broadening the knowledge about the dry sliding wear mechanism of ceramic coatings [16,17], but there are no paper reports on the wet environment tribological behaviour of the APS Al 2 O 3 -13% TiO 2 coatings. Moreover, this research investigates the effect of the injecting mode on the wet sliding wear resistance and combines the results with the cavitation erosion performance of coatings.…”