SOLID PARTICLE EROSION PERFORMANCE OF MICRO ARC OXIDATION and ELECTRO SPARK DEPOSITION COATED Ti6Al4V SHEETS

Authors : Doğan Acar, Salim Levent Aktuğ, Kemal Korkmaz, Salih Durdu, Ömer Necati Cora

Pages : 28-32

View : 25 | Download : 12

Publication Date : 2022-06-30

Article Type : Research

Abstract :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 with 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. Effect of impact velocity (70 and 150 m/s) on erosive wear was examined using angular-shaped SiC erodent particles (348 μm in average diameter). 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. The nature of ESD method resulted in deposits having rough surfaces owing to the rapid solidification of melted electrode and substrate materials under atmosphere 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 material Ti6Al4V considering volumetric and gravimetric wear rates.
Keywords : Micro-Arc Oxidation (MAO), Electro Spark Deposition (ESD), Ti6Al4V, Solid Particle Erosion (SPE)