Title: Investigation of the effect of NiCrAlY/Cr₂O₃/YSZ plasma coatings on erosion performance of MDN 420 steel at high temperature

Authors: G. Madhu Sudana Reddy; C. Durga Prasad; Pradeep Patil; Gagan K. Shetty; Naresh Kakur; M.R. Ramesh

Addresses: The Oxford College of Engineering, Bengaluru, Karnataka, India ' RV Institute of Technology and Management Bengaluru, Karnataka, India ' GITAM University, Bengaluru, Karnataka, India ' Sahyadri College of Engineering and Management, Adyar, Mangaluru 575007, India ' Department of Materials Science and Engineering, University of California, Irvine, USA; National Institute of Technology Karnataka, Surathkal, India ' Department of Materials Science and Engineering, University of California, Irvine, USA; National Institute of Technology Karnataka, Surathkal, India

Abstract: The purpose of the current study was to use an air jet erosion tester to examine the erosive behaviour of plasma sprayed coatings on MDN-420 that were composed of 70% NiCrAlY, 25% Cr₂O₃, and 5% YSZ. Microstructure and phase studies were performed. Measurements were made on the microhardness and adhesion strength. Al₂O₃ erodent was used in a solid particle erosion test with impact angles of 30° and 90° at 300°C, 500°C, and 700°C. The erosion volume loss was measured using an optical profilometer. For the test temperature used, it was found that the coating's erosion resistance was greater than that of the substrate and that it was more pronounced at higher impact angles and higher temperatures. The shape of the degraded coating surface reflects the coating's ductile nature.

Keywords: MDN-420 alloy; NiCrAlY/Cr₂O₃/YSZ; plasma spray; erosion; high temperature.

DOI: 10.1504/IJSURFSE.2023.134785

International Journal of Surface Science and Engineering, 2023 Vol.17 No.3, pp.180 - 194

Received: 15 Nov 2022
Accepted: 23 Dec 2022
Published online: 10 Nov 2023 *

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