Experimental investigation and parameter optimization of Cr۲O۳ atmospheric plasma spray nanocoatings

In this research, Cr۲O۳ ceramic nano-sized powder particles were prepared using ball milling and then were granulated to reach the proper size for spraying. Afterward, Cr۲O۳ nano-coatings were deposited by atmospheric plasma spraying (APS) process onto stainless steel substrates. To optimize APS parameters, spraying was carried out under six conditions with different parameters. Microstructures of the elemental/milled powder and coatings were characterized via a field emission scanning electron microscope (FESEM) equipped with energy-dispersive spectroscopy (EDS). In this research, Cr۲O۳ coatings were deposited under different spraying conditions to understand the effect of APS parameters on the splat formation, deposition efficiency, and porosities of the coatings. After parameter optimization, spraying was performed under a high deposition efficiency of ۴۶.۰±۱.۳%. The optimized Cr۲O۳ coatings showed porosity content, Knoop microhardness, and adhesive strengths of ۸.۷±۲.۲%, ۸۲۳±۲۷ HK۰.۲, and ۴۹±۴ MPa, respectively; making them a good candidate for industrial use.© ۲۰۲۱ The Authors. Published by Synsint Research Group.

Keywords:

Cr۲O۳ , Ball milling , Nano , Atmospheric plasma spray , APS parameter optimization , Ceramic coating