Wear performance analysis and characterization of HVOF deposited Ni–20Cr2O3, Ni–30Al2O3, and Al2O3–13TiO2 coatings

Abstract

The present study was aimed to analyze a slurry erosion failure of SS316L steel coated with high-velocity oxygen-fuel coatings using Ni–20Cr2O3, Ni–30Al2O3, and Al2O3–13TiO2. Slurry erosion experiments were performed using a pot erosion tester for the time duration of 90–180 min at different velocities. The sand particles were used as an erodent to study the erosion wear phenomenon. The concentration of the two-phase slurry was kept in the range of 30–60 wt%. It was seen from the results that speed of rotation, concentration (wt%), and time duration play a vital role in the erosion wear rate of the coated and uncoated AISI 316L. Except for the impingement angle, an increase in the value of all parameters increases the deterioration of parent material with and without coatings. The deterioration rate of the parent material was improved by using coatings. Erosion performance of the AISI 316L was improved by an average of 43.06%, 23.55%, and 13.73% respectively with the deposition of Ni–20Cr2O3, Ni–30Al2O3, and Al2O3–13TiO2 HVOF coatings while all the parameters were varied from lowest to the highest value. Microscopically, the microcutting, smear regions, debonding, lip formation, fracturing, and cracks wear mechanisms occur in Ni–20Cr2O3 HVOF coating. The Ni–30Al2O3 HVOF coating underwent debonding, crater, microcutting, fracturing, ploughing, and lip formation. The major wear mechanisms in Al2O3–13TiO2 coatings are identified as smear, crater, pitting, microcutting, debonding, fracturing, cracks, ploughing, and lip formation.