In this study, atmospheric plasma spraying was used for the preparation of a CoNiCrAlY bonding layer on a nickel (Ni)-based superalloy with different laser shock times designed for surface modification. In addition, electron-beam physical vapor deposition was used to deposit a ceramic layer to form a new modified coating. When comparing high-temperature oxidation resistance with mechanical properties for both traditional coatings and modified coatings as well as the effects of different laser shock times on them, the results showed that the cross-section hardness of the coating under two laser shocks reaches the peak value of 297 HV, which is 11% higher than that of ordinary coating. The growth rate of the thermal growth oxide at the interface of the modified coatings is significantly lower than that of the ordinary coating under different oxidation times at 1000°C. Furthermore, the lowest rate, 2·43 × 10⁻⁴ μm/h, occurs after being laser-shocked twice. With the increase in oxidation time, the residual compressive stress generated during the oxidation increases first and then decreases. Moreover, the stress value of the modified coating after being laser-shocked twice is the smallest. To conclude, this research is of significance for application in surface modification for aviation.

中文翻译：

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激光冲击下CoNiCrAlY粘结层的工艺研究

在这项研究中，大气等离子喷涂用于在镍（Ni）基高温合金上制备CoNiCrAlY粘结层，该层具有不同的激光冲击时间，专门用于表面改性。另外，电子束物理气相沉积被用来沉积陶瓷层以形成新的改性涂层。当比较传统涂料和改性涂料的高温抗氧化性与机械性能以及不同的激光冲击时间对它们的影响时，结果表明，两次激光冲击下涂层的横截面硬度达到峰值297 HV，比普通涂料高11％。在1000℃下，在不同的氧化时间下，改性涂层界面处的热生长氧化物的生长速率明显低于普通涂层。此外，最低比率2·43×10^-4μm  / h，在两次激光冲击后发生。随着氧化时间的增加，氧化过程中产生的残余压应力先增大然后减小。此外，经两次激光冲击后的改性涂层的应力值最小。总而言之，这项研究对于航空表面改性的应用具有重要意义。