TRIBOLOGICAL ANALYSIS OF HVOF-SPRAYED COLMONOY 88 COATING ON SS 409

Surface deterioration at high temperatures shortens the engineering component’s life. Ni-based coatings are widely used for modifying surfaces due to their strong bonding and high-temperature wear resistance. SS 409 and HVOF-sprayed Colmonoy 88 coatings on substrate were tested for erosion wear utilizing a high-temperature air-jet erosion tester. The erosion tests were carried out at the striking velocity (110, 120, and 130[Formula: see text]m/s), incidence angle (30 ∘ , 60 ∘ , and 90 ∘ ), feed rate (2, 4, and 6[Formula: see text]g/min) and time duration (5, 10, 15, and 20[Formula: see text]min) at 400 ∘ C. Fly ash with particle sizes ranging from 75[Formula: see text] [Formula: see text]m to 108[Formula: see text] [Formula: see text]m was used in the studies as the erodent. The erosion performance of coatings was found to be increased with an increase in the value of the velocity, feed rate, and time duration. The experimental results revealed that the maximum wear of SS 409 steel was observed at an impingement angle of 30 ∘ whereas 60 ∘ for Colmonoy 88 coatings in fly ash conditions. The erosion behavior of SS 409 and Colmonoy 88 coating exhibits ductile and mixed modes, respectively. Colmonoy 88 enhanced the microhardness of SS 409 about three times in respect to resistance to wear in fly ash particle erosion on SS 409. Coated samples were more erosion-resistant than bare steel, which might prevent component failure and extend life. The characterization of the surface morphology and chemical content was studied for both the coated and untreated samples using optical microscopy, scanning electron microscopy, and EDX elemental analysis.