Synchrotron X-ray spectromicroscopy analysis of wear tested graphene-containing alumina coatings

Thermally sprayed Al2O3 coatings containing graphene nano platelets (GNP) have been shown to exhibitimproved wear resistance. To understand the positive influence of GNP on wear properties, scanning transmissionX-ray microscopy (STXM) analyses were performed to determine the structural and chemical changesthat occur on the GNP and alumina matrix after wear tests. STXM results acquired at the C K-edge showed thatthe GNP are aligned parallel to the specimen surface in the as-sprayed coatings. GNP flakes are also observed atthe tribo-surface of the wear tested sample. The results obtained at the Al K-edge show that the aluminum oxidebelow the wear track becomes amorphous during the wear test and carbon is dissolved in it. Wear tests performedon thermally sprayed pure alumina samples (without GNP) and on sintered bulk alumina prove thatneither the presence of GNP nor the porosity in the coating are responsible for the amorphization of the aluminamatrix. The results discussed in this work advance the fundamental understanding of graphene-containingcomposites, which is considered very important to exploit the unique advantages of graphene in technologicalapplications.