Structure and abradability of Cu-Al₂O₃ gradient coatings fabricated by plasma spraying

In reflection to the fact that the low adhesion strength and high porosity affected the coatings'abradability of pure ceramic coatings, Cu-Al₂O₃ gradient coatings were fabricated by plasma spraying.The methods of SEM, metallurgical microscope and so on were used to analyse microstructure and component of the coatings and self-made mounting grinding abrasion probe aircraft was used to measure the wearing grinding abrasion of Cu-Al₂O₃ gradient coatings.The results showed that the Cu-Al₂O₃ gradient coatings fabricated by plasma spraying have not apparent structure-accident and macrography interlamination interface, and the structure of coatings express the features of non-homogeneous in macrography and continuous in microscopic.The abradability of coatings is highest when the content of Al₂O₃ in gradient coatings reaches 80%, which is triple of base body.As the content of Al₂O₃ continues enlarging to pure ceramic coatings, its abradability falls down.