Correlation between microstructural characteristics and the abrasion wear resistance of sealed thermal-sprayed coatings

Effects of sealing on corrosion behaviour of plasma-sprayed Cr2O3–8TiO2 coating

“…It is of great benefit to investigate the penetration depth of the sealants. Since it is hard to recognise the transparent colourless sealants from optical micrographs of cross-sections of the coatings,15, 16, 21 microhardness profiles were employed to evaluate the penetration depth of the sealants. The microhardness profiles were measured from the coating surface to the ceramic–bond layer interface.…”

“…The potentiodynamic polarisation of the coatings was carried out with a PARSTAT 2273 Advanced Electrochemical System. The experiment was conducted in unstirred 5?0 wt-% NaCl solution using a scanning speed of 1 mV s 21 . The specimen was used as the working electrode, an Hg/Hg 2 Cl 2 /KCl saturated electrode as the reference electrode and platinum as the auxiliary electrode.…”

“…The penetration depth of sealants has been reported to be much less than 100 mm. 20,21 Not much research has been done on the sealing process under different environments for plasma-sprayed Cr 2 O 3 -8 wt-% TiO 2 (CT8) coatings. In the present work, two commercial sealants were applied, under vacuum and atmospheric pressure, to CT8 coatings, in separate experiments.…”

Chemical Densification of Oxide Based Coatings for High Temperature Wear and Corrosion Resistance

“…However, coatings produced by thermal spraying techniques exhibit a layered structure due to that particles are first melted in the gun and propelled toward the substrate, then flatten and solidify on the prepared substrate surface [1]. They usually possess a residual close porosity, open pores and incomplete interlamellar bonding which can deteriorate the corrosion resistance of the coatingsubstrate system and also decrease the mechanical properties and the wear resistance of the ceramic coatings [2]. To reduce the porosity and to improve the tribological behavior of the ceramic coatings, optimization of processing parameters for thermal spraying has already been investigated [3][4][5].…”

A Study of Parameters Affecting Wear Resistance of Alumina and Yttria Stabilized Zirconia Composite Coatings on Al-6061 Substrate

“…Earlier investigations [8][9][10][11][12] have also reported the wear of thermal sprayed coatings in dry sliding conditions. Wear behavior of plasma sprayed ZrO 2 + 8% Y 2 O 3 coatings, carried out on a reciprocating sliding tester at a temperature of 200 • C, is found to experience plastic deformation and material transfer [6].…”