High temperature (900 °C) sliding wear of CrNiAlCY coatings deposited by high velocity oxy fuel thermal spray

Nickel based superalloy are in demand for high temperature applications and their corrosion, erosion wear resistance have been investigated a long time. chromium (NiCr) alloys widely used corrosion resistant coatings, while carbide nickel (CrC-NiCr) preferred coatings at temperature. In this study CrNiAlCY were deposited via liquid fuelled velocity oxy fuel (HVOF) thermal spray using two parameters tested as coatings. Effects of processing on microstructure mechanical properties the investigated. Results showed that higher oxygen flow rates critical obtaining with lower porosity microhardness. Coating hardness was chosen both room (~24 °C) (900 unlubricated sliding tests ball disc setup. The coating against alumina counterbody under 3 different loading conditions (10, 30 60 N). rate directly proportional to applied load tests, debris produced, which then oxidised pushed away edges track. On other hand, smeared surface tests. into Cr 2 O temperatures, acted protective layer. Although softening took place 10 N similar values due oxide layer formed top surface; however, could not withstand load, started crack lost its ability. • produced liquid-fuelled HVOF spray. studied. Wear performance counter body. Different settings during