Abstract
The objective of present study is to check the high temperature oxidation behavior of NiCrAlY-B4C composite powder-based HVOF coatings on T22 boiler tube steel substrates. The powder coatings composition was made with stoichiometric composition ratio of 80:20 by weight of NiCrAlY and B4C respectively. This composition has been proposed for protection against oxidation in high temperature applications. To check the performance a high temperature oxidation cyclic study at an elevated temperature of 900 °C in air for 50 cycles was carried out and subsequently, corrosion kinetics was evaluated with mass changes after each cycle. The characterization techniques like TEM, XRD, SEM-EDS, and EDS mapping were utilized to check morphology of powder, as-sprayed coatings and after oxidation products. The results showed protective compounds formations in both coatings which improves high temperature oxidation resistance. Additionally, the Nano-composite coating structure showed less porous microstructure than micro-counterpart and provided more resistance to high temperature oxidation.
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