Wear and corrosion resistant coatings on aluminium alloys obtained by thermal spraying
With the aim to elaborate a coating technology for improved wear resistance of AA2017 alloy surfaces Cr3C2/Ni20Cr 75/25 top coats and Ni5Al, Ni5Ti as well as Ni20Cr bond coats are produced. Bond coats are deposited by arc spraying as well as HVOF and top coats by HVOF only. Optimum spraying parameters are determined. The resulting adhesion of bond coats to AA2017 is in the order of 50 MPa. Microscopic investigations point at metallurgical reactions at interfaces both between bond and top coats and between bond coats and substrates. In oscillating wear tests on top coats with alumina balls as counterbody only the coatings are worn, while hardened 100Cr6 steel balls cause no wear of the coatings.
Krystian Butkiewicz, Witold Milewski, Lech Kwiatkowski Institute of Precision Mechanics, 01-796 Warsaw, Duchnicka Str. 3, Poland Bernhard Wielage, Andreas Wank, Hanna Pokhmurska
Institute of Composite Materials, Chemnitz University of Technology, 09107 Chemnitz, Germany