The International Journal of Materials and Engineering Technology, vol.5, no.1, pp.28-32, 2022 (Peer-Reviewed Journal)
In this study, an aerospace-grade Ti6Al4V alloy was coated by micro-arc oxidation (MAO) and
electro spark deposition (ESD) methods to investigate their effect on solid particle erosion
performance. The surface morphology and mechanical properties of coatings were characterized by
SEM and nanoindentation, respectively. Solid particle erosion performance of uncoated and coated
Ti6Al4V alloy was investigated by using an in-house developed test system per ASTM G76-13 test
standard. The effect of impact velocity (70 and 150 m/s) on erosive wear was examined using
angular-shaped SiC erodent particles. The SEM analyses indicated the formation of cracks on
coated surfaces after erosion tests. The MAO coatings’ surface was rough and porous due to plasma
chemical reactions on micro discharge channels. In addition, the nature of the ESD method resulted
in deposits having rough surfaces owing to the rapid solidification of melted electrode and substrate
materials under atmospheric conditions. Surface topography and crater depths were determined
using a surface profilometer. Erosion rate was found to be increased with increasing impact velocity
due to increased kinetic energy of erodent particles. Both MAO and ESD coated samples showed
worse erosion performance compared to base Ti6Al4V material considering volumetric and
gravimetric wear rates