Slurry erosion performance study of HVFS sprayed Ni-20Al(2)O(3) and Ni-15Al(2)O(3)-5TiO(2) coatings under hydro accelerated conditions

摘要

Purpose This paper aims to cover all the aspects of development, investigation and analysis phases to evaluate the slurry erosion performance of test coatings. The powders having composition of Ni-20Al(2)O(3) and Ni-15Al2O(3)-5TiO(2) were deposited on CA6NM grade turbine steel by using high velocity flame spray (HVFS) technique. The characterization of the coatings was done with the help of SEM/EDS and XRD techniques. Various properties such as micro-hardness and bonding strength of the coatings were also evaluated. Thereafter, these coatings were subjected to an indigenously developed high speed slurry erosion tester at different levels of rotational speed, erodent particle size and slurry concentration. The effect of these parameters on the erosion behavior of coatings was also evaluated. The slurry erosion tests and SEM of the eroded surfaces revealed remarkable improvement in slurry erosion resistance of Ni-15Al(2)O(3)-5TiO(2) coating in comparison with Ni-20Al(2)O(3) coating.