Experimental investigation and parameter optimization of Cr2O3 atmospheric plasma spray nanocoatings

Seyedmahdi Hashemi; Nader  Parvin; Zia Valefi; Soroush  Parvizi

doi:10.53063/synsint.2021.1339

Seyedmahdi Hashemi ¹
Nader Parvin ²
Zia Valefi ³
Soroush Parvizi ⁴

¹ Dynamic and Smart Systems Laboratory, Mechanical Industrial and Manufacturing Engineering Department, University of Toledo, OH 43606, USA
² Department of Materials and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
³ Materials Engineering Research Center, Malek Ashtar University of Technology, Tehran, Iran
⁴ Materials Engineering Department, Shahid Rajaee Teacher Training University (SRTTU), Tehran, Iran

https://doi.org/10.53063/synsint.2021.1339

Abstract

In this research, Cr₂O₃ ceramic nano-sized powder particles were prepared using ball milling and then were granulated to reach the proper size for spraying. Afterward, Cr₂O₃ 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, Cr₂O₃ 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 46.0±1.3%. The optimized Cr₂O₃ coatings showed porosity content, Knoop microhardness, and adhesive strengths of 8.7±2.2%, 823±27 HK_0.2, and 49±4 MPa, respectively; making them a good candidate for industrial use.

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Keywords: Cr2O3, Ball milling, Nano, Atmospheric plasma spray, APS parameter optimization, Ceramic coating

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