Abstract
In this paper, the plasma spray technique was used to deposit coatings with reconstituted nanostructured Al 2O 3/TiO 2 powders. The abrasive wear resistance of the ceramic coatings was evaluated using diamond abrasives. The result showed that the abrasive wear resistance of the coatings produced using the nanostructured Al 2O 3/TiO 2 powders is greatly improved compared with the coating produced using the conventional Al 2O 3/TiO 2 powder (Metco 130). The highest abrasion resistance of the coating sprayed with nanostructured Al 2O 3/TiO 2 powder is about four times that of the coating sprayed with the conventional Al 2O 3/TiO 2 powder. Both as fabricated and after wear Al 2O 3/TiO 2 coatings were investigated by X-ray diffraction, SEM and indentation tests. The abrasive wear mechanism is also discussed.
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