Abstract

In this work, the NiCr-Cr3C2 3 C 2 coatings with different Cr3C2 3 C 2 contents were prepared via high-speed laser cladding. The relationships between the composition, microstructure, and high-temperature tribological properties in fluoride molten salts were systematically studied. The results suggest that with the increase of Cr3C2 3 C 2 content, the friction coefficient tends to decrease and stabilize, while the wear rate initially decreases and then increases. Especially for the coating with 60 wt% Cr3C2, 3 C 2 , it exhibits a favorable tribological performance mainly due to the enhanced hardness imparted by Cr3C2, 3 C 2 , with an average friction coefficient of 0.12 and a wear rate of 2.78 x 10-6-6 mm3/Nm. 3 /Nm. However, the coating experiences delamination damage at 70 wt% Cr3C2 3 C 2 content, leading to an increase in wear rate.

Keywords Plus：CORROSION BEHAVIOR，PROCESS PARAMETERS，WEAR BEHAVIOR，CR3C2 CONTENT，MICROSTRUCTURE，CHROMIUM，STEEL，GENERATION，MECHANISM，NICKEL

Published in TRIBOLOGY INTERNATIONAL，Volume200；10.1016/j.triboint.2024.110150，DEC 2024