High-Temperature Erosive Behavior of Plasma Sprayed Cr3C2-NiCr/Cenosphere Coating
This research examines the deposition of Cr3C2-NiCr/cenosphere and Cr3C2-NiCr coatings on MDN 321 steel through the process of plasma spray. In this process, the solid particle erosion test is established at 200, 400, 600 °C with 30° and 90° impact angles. Alumina erodent is adopted to investigate the erosive behavior of the coating at higher temperatures. The properties of the Cr3C2-NiCr/cenosphere coating are established based on the microhardness, the adhesive strength, the fracture toughness, and the ductility. To quantify volume loss as a result of erosion, an optical profilometer is used. At higher temperature, decrease in the erosion volume loss of Cr3C2-NiCr/cenosphere and Cr3C2-NiCr coatings is observed. The erosion-resistive property of Cr3C2-NiCr/cenosphere coating is higher than that of MDN 321 steel by 76%. This property is influenced by high-temperature stability of mullite, alumina, and protective oxide layer that is formed at elevated temperatures. The morphology of eroded coating discloses a brittle mode of material removal.
Keywordsbrittle failure cenospheres erosion plasma spray
The authors are grateful to Prof. Ramesh Singh, IIT Bombay, India, for providing the optical profilometer facility. The authors wish to thank Spraymet Surface Technologies Pvt Ltd, Bangalore, India, for providing the facility of the plasma spray coating. Department of Science and Technology grant DST/TSG/AMT/2015/394/G is acknowledged by Mrityunjay Doddamani. Authors also thank Mechanical Engineering Department of NIT-K for providing support and facilities required.
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