| WU Yan,GU Jiawei,XIE Yongle.Effect of Heat Exposure Temperature on Performance of TiAlSiN Gradient Coatings[J],54(6):108-114 |
| Effect of Heat Exposure Temperature on Performance of TiAlSiN Gradient Coatings |
| Received:April 15, 2024 Revised:July 04, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.06.009 |
| KeyWord:TiAlSiN gradient coating cathode arc ion plating heat exposure temperature surface microstructure mechanical property |
| Author | Institution |
| WU Yan |
College of Mechanical Engineering, Shanghai Institute of Technology, Shanghai , China;Shanghai Engineering Research Center of Physical Vapor Deposition PVD Superhard Coating and Equipment, Shanghai Institute of Technology, Shanghai , China |
| GU Jiawei |
College of Mechanical Engineering, Shanghai Institute of Technology, Shanghai , China |
| XIE Yongle |
College of Mechanical Engineering, Shanghai Institute of Technology, Shanghai , China |
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| Abstract: |
| TiAlSiN coatings have attracted much attention due to their excellent performance and are widely used in industrial fields such as cutting tools and molds. However, there is still limited research on the performance of TiAlSiN coatings in the high-temperature field. In order to explore the performance of TiAlSiN coatings at high temperature more clearly, this paper designed TiSiN/TiAlSiN/TiAlN/TiN gradient coatings and prepared them using cathodic arc ion plating technology. The coatings were heated at different heat exposure temperature, and X-ray diffraction (XRD), scanning electron microscopy (SEM), nanoindentation tester, and Rockwell hardness tester testing equipment were used to characterize the effect of 1 hour of heat exposure at different temperature on the surface microstructure, mechanical properties, and bonding strength of TiAlSiN gradient coatings, and to elucidate the high-temperature resistance mechanism of TiAlSiN gradient coatings. Research found that TiAlSiN gradient coatings exhibited good surface smoothness after being exposed to high temperature of 600 ℃ and 700 ℃ for 1 hour, with a small amount of small droplets, pinholes, and shallow pits, as well as fewer cluster areas; After thermal exposure at 600 ℃, the phase composition and diffraction peak intensity remained almost unchanged. After thermal exposure at 700 ℃, a new WN phase was generated, leading to an increase in diffraction peak intensity. At 800 ℃, the surface smoothness was good, and the diffraction peak intensity was significantly reduced. At 900 ℃ and above, the surface smoothness of the coatings deteriorated, and a large number of oxide particles formed on the coating surface, resulting in a significant decrease in mechanical properties. It was also found that the hardness and bonding strength of TiAlSiN gradient coatings decreased with increasing temperature, while the elastic modulus first decreased, then increased, and then decreased again with increasing temperature. Compared with the hardness and elastic modulus under no heat exposure, the decrease rate of hardness and elastic modulus after 1 hour of exposure at 600 ℃ was 23.1%; The hardness decrease rate after 1 hour of exposure at 700 ℃ was 29.6%, and the elastic modulus decrease rate was 12.9%; The hardness decrease rate after 1 hour of exposure at 800 ℃ was 37.5%, and the elastic modulus decrease rate was 15.9%; The hardness decrease rate after 1 hour of exposure at 900 ℃ was 53.4%, and the elastic modulus decrease rate is 21.5%. The excellent high-temperature resistance of TiAlSiN gradient coatings was due to the formation of Al2O3, TiO and TiO2 oxide films in high-temperature environments, which reduced the diffusion rate and activity ability of O elements and effectively slowed down the oxidation rate. And due to the loose and porous structure of the TiO2 oxide film, on the one hand, it could refine the grain size, and on the other hand, it also increased the diffusion channels of elements such as Al and Ti, allowing the coating to form more dense oxide films in a shorter time. In summary, TiAlSiN gradient coatings have excellent high-temperature oxidation resistance, and maintains excellent mechanical properties and high-temperature thermal stability even after being exposed to high temperature not exceeding 800 ℃. Therefore, the testing temperature of TiAlSiN gradient coatings can reach 800 ℃ and they have strong high-temperature durability, making it a comprehensive protective coating with excellent performance. |
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