Characterization and elevated-temperature tribological performance of AC-HVAF-sprayed Fe-based amorphous coating

Microstructure, mechanical properties, and elevated-temperature (below the glass transition temperature) tribological performance of the activated combustion-high velocity air fuel (AC-HVAF)-sprayed Fe-Cr-Mo-W-C-B-Y amorphous coating (AC) were investigated. In vacuum, the enhanced hardness favored the wear resistance of Fe-based AC as the temperature rose from 293 K to 673 K. Moreover, the wear mechanism was modified from abrasive wear accompanied by delamination and adhesive wear to the delamination and adhesive wear. In air, the oxidation reaction worsened the splat-to-splat bonding and accelerated the wear rate of Fe-based AC at 673 K. Meanwhile, the elevated-temperature wear failure was the delamination, adhesive, and intensified oxidative wear. Fe-based AC exhibited superior elevated-temperature wear resistance, demonstrating its significant prospect as a wear-resistant coating material for aggressive elevated-temperature applications.