Study on Cu-Ag-Zn Abradable Seal Coatings by Cold Spraying

Abstract: Cu-Ag-Zn abradable seal coatings were prepared on superalloy DZ445 by cold spraying. The micro-mophologies of Cu-Ag-Zn powders and coatings were analyzed by SEM and EDS. Thermal shock test was done to evaluate the combination strength between Cu-Ag-Zn coating and the substrate. In addition, the friction and wear properties of Cu-Ag-Zn coatings were also tested on a disc sliding friction machine sales. In order to improve the combination strength and the quality of the coating, two methods including annealing the coatings in vacuum and heating the feed powders in cold spraying were tried, respectively. It is shown that Cu-Ag-Zn coatings made by cold spraying with powder heating exhibit best combination strength and anti-friction properties. In addition, the combination mechanism of Cu-Ag-Zn coatings was also proposed.

PS£šI'd like this paper could be considered for publication on a special issue of Journal of Thermal Spray Technology as a peer-reviewed paper. Thank you!