材料科学
热障涂层
铪
热稳定性
热导率
断裂韧性
热膨胀
复合材料
相(物质)
兴奋剂
合金
锆
冶金
光电子学
陶瓷
化学工程
化学
有机化学
工程类
作者
Y. H. Wu,Hong Du,Xin Zhong,Yaran Niu,Xuebin Zheng
标识
DOI:10.1016/j.ceramint.2023.03.280
摘要
Thermal barrier coatings (TBC) are important materials applied to hot part components of aero-engines in order to improve their service temperature. Increasing inlet temperature is an important factor to achieve elevated thrust-to-weight ratio and high heat engine efficiency. In recent years, traditional TBC materials have gradually reached their operating limits due to the increase in turbine operating temperature. Hafnium-based materials become promising new candidates for TBC because of the similar structure, higher temperature phase stability and lower thermal conductivity compared to traditional zirconium-based materials. In this review, recent progresses in the research and development for hafnium-based TBC materials are summarized. The phase stability, thermal and mechanical properties of rare-earth (RE)-doped HfO2 and RE hafnate materials are introduced. RE-doped HfO2 has good thermal properties and phase stability at high temperatures whereas relatively low fracture toughness. The RE hafnates possess the advantages of a higher phase transition temperature, lower thermal conductivity and superior fracture toughness than RE zirconates. However, the thermal expansion coefficients of most RE hafnates are quite different from the alloy matrix. Finally, further research directions for hafnium-based TBC materials are prospected in this study.
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