Lanthanum–Cerium Oxide as a Thermal Barrier-Coating Material for High-Temperature Applications


  • The authors thank W. Reichert (Forschungszentrum Jülich, FZJ, Germany) for XRD measurements, K. H. Rauwald and R. Laufs (FZJ) for their invaluable assistance during plasma spraying and thermal cycling tests. The discussions about the thermal expansion measurements with Prof. X. H. Zhao of Peking Normal University of China and about the SEM experiments with L. H. Ge of Changchun Institute of Applied Chemistry (CIAC, China) were highly appreciated by the authors. Most of the experiments in this paper were carried out in, and financially supported by, the FZJ, the rest of the work was finished at the CIAC and financially supported by “Bai Ren” and “863 (2002AA332010)” Projects.


La2Ce2O7 is proposed as a new material for thermal barrier coating that has a higher thermal expansion coefficient and a lower thermal conductivity than traditional coating materials. After long-term annealing at 1400 °C, the crystal structure of La2Ce2O7 was maintained (see Figure). Below 300 °C, thermal contraction occurs, and the material has a comparable thermal cycling life to yttria-stabilized zirconia coatings.