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

2006 ◽  
pp. 117-125
Author(s):  
Clarice Terui Kunioshi ◽  
Olandir Vercino Correa ◽  
Lalgudi Venkataraman Ramanathan
Keyword(s):  
High Temperature ◽  
Oxidation Behavior ◽  
High Temperature Erosion ◽  
Thermally Sprayed

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

2006 ◽  
Vol 530-531 ◽  
pp. 117-125 ◽  
Author(s):  
Clarice Terui Kunioshi ◽  
Olandir Vercino Correa ◽  
Lalgudi Venkataraman Ramanathan
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Scanning Electron Microscope ◽  
Fluidized Bed ◽  
Oxidation Behavior ◽  
Steel Substrate ◽  
Alumina Powder ◽  
High Temperature Erosion ◽  
Thermally Sprayed ◽  
Scanning Electron

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.

scholarly journals High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

2017 ◽  
Vol 20 (4) ◽  
pp. 994-1002 ◽  
Author(s):  
Cecílio Alvares da Cunha ◽  
Olandir Vercino Correa ◽  
Isaac Jamil Sayeg ◽  
Lalgudi Venkataraman Ramanathan
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Erosion ◽  
Thermally Sprayed
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