Invited Speaker

Assoc. Res. Bo Cheng

Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS)

E-mail: yxue20@licp.cas.cn

Title: Design and Property Study on High-Entropy Cerium Oxide-Based Thermal Barrier Coatings

Profile:

Yun Xue, Ph.D., Young researcher at Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS)/Center of Lanzhou Lubrication Materials and Technology Innovation. Dr. Xue received her Ph.D. from the University of Chinese Academy of Sciences in 2023 and subsequently joined the Lanzhou Institute of Chemical Physics for research. In the same year, she was awarded funding under the prestigious CAS "Special Research Assistant Program" and was appointed as a Young Researcher. Dr. Xue’s research focuses on the fundamentals and applications of high-entropy ceramic thermal barrier coatings (TBCs). Her work emphasizes the composition, structural design, and performance tuning of high-entropy TBCs, with a particular interest in structural innovations and novel design strategies. She is dedicated to developing core surface engineering technologies for next-generation high-entropy TBCs. She has published multiple research papers as the first author or corresponding author in leading journals such as Chemical Engineering Journal, Journal of Advanced Ceramics, Corrosion Science, and Tribology International. Up to now, Dr. Xue has led several research projects as the principal investigator, including the National Natural Science Foundation of China (Youth Program), the China Postdoctoral Science Foundation, the Gansu Provincial Natural Science Foundation, the Lanzhou Youth Science and Technology Talent Innovation Project (Key Research Project), and the Open Project of the Guangdong Institute of New Materials. Meanwhile, she has contributed to National Key Research and Development Program of China.

Abstract:

The rapid development of high-performance aero-engines and gas turbines urgently requires thermal barrier coatings (TBCs) with lower thermal conductivity, higher coefficient of thermal expansion, higher temperature resistance, corrosion resistance, and thermal shock resistance. The emergence of high-entropy ceramics has created more possibilities for the design of ceramic top-layer materials in TBCs. Therefore, based on the research of the traditional A2B2O7-type rare earth cerium oxide (such as La2Ce2O7) thermal barrier materials, the A-site component was designed and regulated by high entropy, leading to the generation of high-entropy rare earth cerium oxide ceramics for TBCs. The compositional relationship between high-entropy configuration and thermophysical properties of the materials was studied. Besides, the corrosion resistance was investigated in depth. The mechanism of high-entropy ceramics' special effects on improving the corrosion resistance of TBCs was clarified, and the corrosion mechanism of high-entropy ceramics was revealed. On this basis, different-structured high-entropy TBCs were fabricated by atmospheric plasma spraying, and the thermal shock resistance of the coatings was systematically evaluated. The research results showed that the reasonable design of the composition and microstructure of high-entropy TBCs enabled them to exhibit better thermal shock resistance, thereby establishing the enhancement mechanism of the high-entropy configuration with the structure of the coating. The accumulation of previous research work provides an important reference for the development and design of advanced high-entropy TBCs.

Keywords: Atmospheric Plasma Spraying (APS), Thermal Barrier Coatings (TBCs), High-entropy Ceramics, Thermal Protection Performance