Keynote Speaker

Prof. Jing Feng

Faculty of Materials Science and Technology, Kunming University of Science and Technology 

E-mail: jingfeng@kust.edu.cn

Title: Rare-earth Tantalates for Next-generation Thermal Barrier Coatings

Profile:

Dr. Jing Feng received his PhD in Tsinghua University, and he worked as an associated researcher and postdoc in Harvard University with Prof. David R. Clarke. Currently, he is a professor in school of Materials science and engineering of Kunming University of Science and Technology. His group focuses on high-temperature ceramics, first-principle calculation, energy materials. He has been focused on (1) Thermal barrier coatings; (2) Environmental barrier coatings; (3) high-temperature alloys; (4) Perovskite solar cell; (5) Thermoelectric materials. Now, he has published over 260 papers, which are cited by 15000+ times, and the synthesized rare-earth tantalates coatings are widely used in various hot-end components as T/EBCs.

Abstract:

Ceramic thermal barrier coatings (TBCs) have attracted significant research attention owing to their utility in the thermally insulating alloy components of gas turbines and aircraft engines that operate at high temperatures. Most TBCs comprise yttria-stabilized zirconia (YSZ); however, YSZ no longer meets the demands of modern TBC applications due to its low working temperature and high thermal conductivity. It is therefore imperative to develop a ferroelastic ceramic to replace YSZ in TBC applications. Ferroelastic rare-earth tantalates (RETaO₄) possess many desirable properties, such as ferroelastic toughening, low thermal conductivity, high thermal expansion coefficients, and excellent comprehensive mechanical properties, and thus, they are promising next-generation TBCs, which are expected to operate at ultra-high temperatures (≥1600 °C). This review summarizes the thermophysical properties, CaO-MgO-AlO_1.5-SiO₂ (CMAS) corrosion resistance, coatings, and shortcomings of three types of tantalate ceramics (RETaO₄, RE₃TaO₇, and RETa₃O₉) and outlines the direction of future work in this field.