1. TiN/TiO2 composite coatings: preparation, microstructures and tribological properties.
- Author
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Sun, Junlong, Liu, Changxia, Zhang, Kai, Venturi, Federico, Romero, Acacio Rincon, and Hussain, Tanvir
- Subjects
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SURFACE coatings , *COMPOSITE coating , *HEAT of reaction , *METAL spraying , *TITANIUM dioxide , *SUBSTRATES (Materials science) , *MICROSTRUCTURE , *CRACK propagation (Fracture mechanics) - Abstract
In our present work, TiN suspension was sprayed onto the 316 stainless steel substrate using the suspension high velocity oxy fuel thermal spray. An in-situ reaction between TiN and O 2 occurred during the spray process to form TiO 2 and TiN/TiO 2 composite coatings were fabricated. The phase evolution, microstructures and tribological properties of TiN/TiO 2 composite coatings were studied. Results showed that the interface between the coating and the substrate was well bonded, which was mainly owing to the in-situ reaction heat and the sufficient deformation of particles. The structure of molten particles, small grain size and low porosity could contribute to improving the mechanical and tribological properties of the in-situ coating. A schematic exfoliation process of TiN/TiO 2 composite coating was proposed to analyze the failure of coatings. The antiwear mechanisms of the TiN/TiO 2 composite coatings were discussed. The good cohesive bonding strength and high hardness of the TiN/TiO 2 composite coating, the pinning role of TiN in crack propagation, and the newly formed TiO 2 in the friction layer during the sliding test contributed to the improvement of tribological properties for the TiN/TiO 2 composite coating. This work could provide a reference for the application of TiN/TiO 2 composite coating in the field of friction and wear. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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