| ZHANG Ergeng,FU Qiaohui,LIANG Dandan,CHEN Qiang,ZHOU Qiong,HUANG Biao.Microstructural Design and Tribological Properties of TiAlCN Multilayer Films[J],53(23):143-152 |
| Microstructural Design and Tribological Properties of TiAlCN Multilayer Films |
| Received:December 20, 2023 Revised:May 23, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.23.012 |
| KeyWord:TiAlCN multi-layer coating structure design mechanical property tribological properties |
| Author | Institution |
| ZHANG Ergeng |
Shanghai Physical Vapor Deposition PVD Superhard Coating and Equipment Engineering Technology Research Center, Shanghai Institute of Technology, Shanghai , China |
| FU Qiaohui |
Shanghai Physical Vapor Deposition PVD Superhard Coating and Equipment Engineering Technology Research Center, Shanghai Institute of Technology, Shanghai , China |
| LIANG Dandan |
Shanghai Physical Vapor Deposition PVD Superhard Coating and Equipment Engineering Technology Research Center, Shanghai Institute of Technology, Shanghai , China |
| CHEN Qiang |
Shanghai Physical Vapor Deposition PVD Superhard Coating and Equipment Engineering Technology Research Center, Shanghai Institute of Technology, Shanghai , China |
| ZHOU Qiong |
Shanghai Physical Vapor Deposition PVD Superhard Coating and Equipment Engineering Technology Research Center, Shanghai Institute of Technology, Shanghai , China |
| HUANG Biao |
Shanghai Physical Vapor Deposition PVD Superhard Coating and Equipment Engineering Technology Research Center, Shanghai Institute of Technology, Shanghai , China |
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| Abstract: |
| Although TiAlCN coating exhibits high hardness and good self-lubricity in high-speed cutting and non-lubricated working environments, the microcracks and spalling generated during the practical applications greatly limit its wide application. Therefore, how to improve the toughness of the TiAlCN coating and enhance the binding force between the coating and the substrate has become a hot spot in the research. Previous studies have shown that the mechanical properties of coatings can be further improved by adjusting or designing the microstructure of the coatings. However, there are fewer studies on the structural changes of TiAlCN coatings and their effects on mechanical and tribological properties. Therefore, the effect of the multilayer structure on the mechanical and tribological properties of TiAlCN coatings was investigated, and the underlying mechanism was also discussed. Based on the cathode arc technique, a TiAlCN monolayer coating, a TiAlN-TiAlCN bilayer coating, and a TiAlN-TiAlCN multilayer coating were deposited on 316 stainless steel substrates with a dimension 20 mm×20 mm×2 mm. In order to improve the binding force between the coating and the substrate, the bottom layer TiN was successfully deposited on the substrate. The micromorphology and phase composition of the TiAlCN coating were characterized by scanning electron microscopy (SEM), X-ray diffractometer (XRD) and Raman spectrometer, respectively. Furthermore, the mechanical properties of the TiAlCN coating were evaluated by nanoindentation instrument and Vickers hardness tester. Finally, the tribological properties of the TiAlCN coating were analyzed by friction wear testing machine, Raman spectrometer, and energy dispersive spectrometer (EDS). The experimental results and analysis showed that the introduction of multilayer structure could improve the mechanical properties and wear resistance of the TiAlCN coating. The results showed that there are large droplets in all TiAlCN coatings. In addition, the introduction of multilayer interfaces could effectively inhibit the growth of columnar crystals and refine the grain size, thus significantly improving the surface quality of the TiAlCN multilayer coatings. The main compositional phases of all TiAlCN coatings were (Ti, Al)(C, N), which grew along the (111), (200) and (220) crystal planes. However, compared with the monolayer coating, the diffraction peak of the bilayer and multilayer coatings were shifted due to the change of lattice constant. Among these three coatings, the TiAlCN multilayer coating showed the highest hardness and the best toughness benefiting from the coherent strengthening effect and modulus difference theory. Moreover, the multilayer coating could produce more elastic deformation to disperse and absorb stress under load. The ID/IG values of the worn TiAlCN coatings were increased, indicating the enhanced degree of graphitization of TiAlCN coatings. The wear mechanisms of all TiAlCN coatings were abrasive wear and oxidation wear. In addition, the TiAlCN multilayer coating presented the highest friction coefficient (0.26) and the lowest wear rate (9.3×10‒6 mm3/(N∙m)), which was ascribed to the increased contact area between the TiAlN sublayer and the friction pair, the larger ID/IG ratio, and the higher oxidation degree. Consequently, compared with monolayer and bilayer TiAlCN coatings, the mechanical properties and wear resistance of TiAlCN multilayer coatings could be significantly improved by the introduction of multilayer structure. |
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