Abstract
The microstructure, mechanical properties, and electrochemical performances of TiCN composite coatings were investigated. Via the modification of the C2H2/N2 flow ratio, TiCN coatings with various C contents were synthesized by combining a cathodic arc and glow discharge technology. With a C2H2/N2 flow ratio of 1:8, TiCN coating mainly consisted of the TiC phase. As the C2H2/N2 flow ratio exceeded 1:4, the crystallinity of TiCN coatings deteriorated. The coexistence of the amorphous and crystalline phases was detected in TiCN coatings with a C2H2/N2 flow ratio of 3:8. The introduction of the C element into TiCN coatings could disturb the growth orientation and induce dislocation motion, leading to an enhancive toughness and a decrease in hardness and elastic modulus. Moreover, the precipitation of amorphous C or CNx was beneficial to the corrosion resistance of TiCN coatings. This finding indicates the potential application of TiCN composite coating in corrosive environments.
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