Sliding Wear Behavior of Al2O3–TiO2 Coatings Fabricated by the Suspension Plasma Spraying Technique

Abstract

Abstract:In this study, friction and dry sliding wear behavior of alumina and alumina-titania nearnanometric coatings have been studied. Coatings were obtained by Suspension Plasma Spraying (SPS) technique. Dry sliding wear tests were performed in an a tribometer with a ball on disk configuration, using a Al2O3 ball as a counterpart with a normal load of 2N, a sliding distance of 1200m and a sliding speed of 0.1 m/s. The influence of TiO2 addition in fabricated coatings was related with friction coefficient behavior, wear rates and wear damage patterns. A remarkable increment in wear resistance was founded by the TiO2 addition effect, in 2.6 times for the biggest amount. The analysis of wear surface was correlated with microstructural parameters, mechanical properties and wear rates.

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

“…This behaviour leads to the conclusion that, as expected, the resultant H and E values obtained by indentation depends strongly on the density of the coating and not so much on the intrinsic properties of the projected material. Nevertheless, our group previously reported [26] …”

“…Improving the quality of Al 2 O 3 coatings is of special interest because of its exceptional wear resistance properties [26][27][28]. In this sense, researchers are focusing their attention to find the experimental SPS conditions to obtain denser alumina coatings while maintaining the nanostructure.…”

Axial Plasma Spraying of Mixed Suspensions: A Case Study on Processing, Characteristics, and Tribological Behavior of Al2O3-YSZ Coatings

“…In the case of APS Al 2 O 3 coating, the addition of nano-sized YSZ has been to reduce the friction coefficient of the coating [30]. Apart from the use of YSZ material, the addition of TiO 2 has also been shown to reduce the friction coefficient of Al 2 O 3 suspension based coating [41].…”

THE EFFECT OF SEALING PROCESSES ON THE CORROSION BEHAVIOUR OF Al₂O₃-13 WT.%TiO₂ COATING

“…Manufacturing ceramic coatings with high wear-, corrosionresistance is important for many industrial processing applications [2,3]. As a mature technology, thermal spraying process has been widely used to deposit ceramic coatings on different metals, such as steels [4,5,6], irons [7], aluminium alloys [8], superalloys [9] to protect the substrate from wear [10,11], corrosion [12], thermal fatigue [13] and cavitation erosion [14] for a long service life. Oxide ceramics, due to their excellent properties including high hardness, high chemical inertness [13,14] in a variety of aggressive environments [15], and good wear resistance, are promising candidates as corrosion-resistant coatings in industrial applications, although there are some inevitable defects in the coatings [16,17].…”