@article{Ye2025, 
author = {Zhiyun Ye and Shuqi Wang and Shuang Yu and Xinrui Zhao and Yongchun Zou and Guoliang Chen and Lei Wen and Lina Zhao and Guangxi Zhang and Yaming Wang and Jiahu Ouyang and Dechang Jia and Yu Zhou},
title = {HfC–HfO2 modified high/superhigh temperature thermal protection coating for superior hot corrosion resistance and antioxidation performance},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {1},
pages = {9221014},
keywords = {high-temperature oxidation resistance, thermal protection coating, niobium alloys, hot corrosion resistance, stress release mechanism},
url = {https://www.sciopen.com/article/10.26599/JAC.2024.9221014},
doi = {10.26599/JAC.2024.9221014},
abstract = {With advances in the thrust-weight ratio, the service temperature of gas turbine engines even exceeds 1500 °C, which is urgent for the development of high/superhigh-temperature thermal protection systems (TPSs) for long-term service. Niobium alloys are increasingly viewed as promising structural materials for high-temperature applications because of their superior high-temperature mechanical strength, but the “pest” catastrophic oxidation greatly restricts their further application. In this study, a HfC–HfO2-modified silicide coating was prepared via an innovative method of halide-activated pack cementation (HAPC) combined with liquid-plasma-assisted particle deposition and sintering of niobium alloys, resulting in a composite coating with excellent hot corrosion resistance and high-temperature oxidation resistance. This modified multilayer coating is characterized by the synergistic combination of a dense NbSi2 inner layer and a HfC–HfO2 porous outer layer, resulting in a significant improvement in high-temperature performance compared with that of the single NbSi2 coating. The corrosion gain of the composite coating is only 13.94 mg·cm−2 after a corrosion time of 200 h at 900 °C, and an intact oxide scale surface is observed after oxidation at 1500 °C for 500 min. This improvement is attributed to the formation of a robust Hf-rich skeleton provided by the deposited HfC–HfO2 layer, which can accelerate the formation of a highly stable corroded layer/oxide scale. In addition, multiple stress release mechanisms of the composite coating at high temperatures also provide substantial contributions to long-term service. All these merits make HfC–HfO2-modified composite coatings on niobium alloys competitive for the development of high/superhigh-temperature thermal protection systems for long-term service.}
}