The microstructure, phase composition, and tribological properties of coatings deposited on beryllium bronze to enhance its wear resistance were investigated. Composite and gradient Cu - Ti coatings, as well as single-layer and multilayer TiN and CrN / TiN coatings, were examined. It was found that composite and gradient Cu - Ti coatings exhibit a multiphase structure with either a uniform or gradient titanium distribution across the coating cross-section, depending on the ion-plasma spraying parameters. Multilayer CrN / TiN coatings displayed a well-defined layer periodicity, with individual layer thicknesses of 250 nm (16-layer coating) and 125 nm (32-layer coating). The single-layer TiN coating featured a columnar microstructure and had a total thickness of 4 μm. To enhance the adhesion of TiN and CrN coatings to the substrate, a Cu - Ti interlayer was applied, reducing interfacial stresses and improving bond strength. Scratch tests confirmed good adhesion for all coatings, with the coatings sustaining loads ranging from 10 N (single-layer and 16-layer coatings) up to 30 N (CrN coating with a Cu - Ti interlayer). Tribological tests revealed that most coatings wear via a microabrasive friction mechanism, except for the composite and gradient Cu - Ti coatings, which fail through an adhesive-brittle mechanism. The 32 - layer CrN / TiN coating and the coatings with a Cu - Ti interlayer exhibited the highest wear resistance. The findings demonstrate that multilayer architectures and Cu - Ti interlayers significantly enhance the mechanical and tribological properties of beryllium bronze coatings, making them promising for high-load and high-wear applications.
SEMENCHUK et al. (Wed,) studied this question.
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