| LI Hai-tao,CHENG Dong-hai,SHI Chao,ZHANG Ti-ming,CHEN Yi.Influence of Holding Time on Structure, Residual Stress and Wear Resistance of Ti/TiN/TiCN Composite Coatings[J],51(7):141-149 |
| Influence of Holding Time on Structure, Residual Stress and Wear Resistance of Ti/TiN/TiCN Composite Coatings |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.07.013 |
| KeyWord:holding time Ti/TiN/TiCN coatings magnetron sputtering residual stress wear resistance |
| Author | Institution |
| LI Hai-tao |
College of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| CHENG Dong-hai |
College of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| SHI Chao |
College of Materials Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| ZHANG Ti-ming |
College of Aviation Manufacturing Engineering,Nanchang , China |
| CHEN Yi |
College of Aviation Manufacturing Engineering,Nanchang , China |
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| Abstract: |
| This paper aims to improve the surface hardness and wear resistance of magnesium alloys. Ti/TiN/TiCN composite coatings were deposited on AZ31 by magnetron sputtering method and annealed at different holding time. The chemical composition, crystalline structure, residual stress, surface and wear morphology were determined by X-ray fluorescence (XRF), grazing incidence X-ray diffraction (GIXRD) and scanning electron microscopy (SEM), respectively. In addition, the wear resistance of the coatings was evaluated by a pin-disk friction and wear tester and a Nano indentation instrument. The results showed that the grain size of annealed coatings increased, the internal defects decreased, the coating was denser, and the residual stress decreased significantly. Moreover, the coatings were composed of FCC TiCN phase before and after annealing, which under different holding times had different preferred growth orientation. Furthermore, with the increase of the holding time, Ti and C contents on the coating surface first increase and then decrease, while N element contents first decrease and then increase, the surface hardness of the coating decreases, the friction coefficient increases, and the wear resistance decreases. The deposited coating with good toughness, the friction coefficient fluctuates greatly, and the wear mechanism is mainly scratch wear. After annealing for 30 min, the coating has the lowest wear rate, the wear mechanism is mainly abrasive and adhesive wear. After annealing for 90 min, the coating has the widest wear scratch, the worst toughness and the highest wear rate, the wear mechanism is mainly abrasive and oxidation wear. In conclusion, annealing is conducive to reducing residual stress, but the annealing time should not be too long. If the time exceeds 30 min, the wear resistance of the coating will decrease. |
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