High Temperature Erosion-Oxidation Behavior of Thermally Sprayed NiCr Based Alloy and Cermets Coatings

Abstract:

The erosion-oxidation (E-O) behavior of high velocity oxy fuel (HVOF) sprayed Ni20Cr alloy as well as WC and Cr3C2 cermet coatings on a steel substrate were studied. The E-O tests were carried out in a rig with specimen assemblies that were rotated through a fluidized bed of erodent particles in the temperature range 500-850°C and with erodent impact velocities of 2.5-19.5 ms-1. Alumina powder (~200Am) was used as the erodent. The E-O resistance of the coatings was determined as wastage, as a function of temperature. The three coatings did not exhibit any significant change in E-O at temperatures up to 500-600°C. At higher temperatures, wastage increased with temperature, reached a maximum at 700°C and then decreased with further increase in temperature. Different E-O regimes were identified. The specimen surfaces were examined in a scanning electron microscope and their roughness determined. E-O maps have been drawn that define conditions under which the coatings undergo low, moderate and severe wastage.

• Periodical: Materials Science Forum (Volumes 530-531)
• Pages: 117-125
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.530-531.117
• Online since: November 2006
• Authors: Clarice Terui Kunioshi, Olandir Vercino Correa, Lalgudi Venkataraman Ramanathan
• Keywords: Cermet Coatings, Composite, Erosion, Erosion-Oxidation , Erosion-Oxidation Maps, HVOF, Surface Roughness (SR)

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