High-Temperature Erosive Behavior of Plasma Sprayed Cr3C2-NiCr/Cenosphere Coating
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Date
2018
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Springer New York LLC barbara.b.bertram@gsk.com
Abstract
This research examines the deposition of Cr<inf>3</inf>C<inf>2</inf>-NiCr/cenosphere and Cr<inf>3</inf>C<inf>2</inf>-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 Cr<inf>3</inf>C<inf>2</inf>-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 Cr<inf>3</inf>C<inf>2</inf>-NiCr/cenosphere and Cr<inf>3</inf>C<inf>2</inf>-NiCr coatings is observed. The erosion-resistive property of Cr<inf>3</inf>C<inf>2</inf>-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. © 2018, ASM International.
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Keywords
Alumina, Aluminum oxide, Austenitic stainless steel, Coatings, Erosion, Fracture toughness, High temperature effects, Mullite, Plasma jets, Silicate minerals, Adhesive strength, Brittle failures, Cenospheres, Elevated temperature, High temperature stability, Optical profilometer, Protective oxide layers, Solid particle erosion, Plasma spraying
Citation
Journal of Materials Engineering and Performance, 2018, 27, 4, pp. 1592-1600