Abstract
In this work, the NiCr-Cr3C2 coatings with different Cr3C2 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 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, it exhibits a favorable tribological performance mainly due to the enhanced hardness imparted by Cr3C2, with an average friction coefficient of 0.12 and a wear rate of 2.78 × 10−6 mm3/Nm. However, the coating experiences delamination damage at 70 wt% Cr3C2 content, leading to an increase in wear rate.
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