Abstract
Cold spraying was first used for the purpose of preparing nickel-based high-temperature lubrication coatings. High-quality In625-Cr2O3-Ag composite coatings were deposited by a high-pressure cold-spray system, and their tribological properties were evaluated at 20 and 1000 °C by a high-temperature tribometer. The microstructure, composition, and wear mechanisms of the coatings were analyzed by x-ray diffraction, scanning electron microscopy, and Raman spectroscopy. The measurements showed that the cold-sprayed In625-Cr2O3-Ag composite coatings have a very dense structure, good bonding strength to substrate, low friction coefficient, and excellent wear resistance. The friction coefficients of the In625-Cr2O3-Ag coatings were around 0.3 and the wear rates of the coating were maintained at about 10−5 mm3/N m at 20 and 1000 °C. The experimental observation of the wear tracks revealed that the silver provided lubrication at 20 °C. As the temperature increased up to 1000 °C, a lubrication layer with low shear strength made up of Ag2MoO4 and Cr2O3 was formed on the wear track.
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