Journal of Inorganic Materials

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Lanthanum-cerium Oxide Thermal Barrier Coatings Prepared by Atmospheric Plasma Spraying

MA Wen1, 2, GUO Hong-Bo2, GONG Sheng-Kai2, DONG Hong-Ying3   

  1. (1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot 010051, China; 2. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China; 3. School of Chemistry Engineering, Inner Mongolia University of Technology, Huhhot 010051, China)
  • Received:2009-01-13 Revised:2009-02-20 Online:2009-09-20 Published:2009-09-20
  • Contact: DONG Hong-Ying

Abstract: Lanthanum-cerium oxide (La2Ce2O7, LC) thermal barrier coatings (TBCs) were prepared by atmospheric plasma spraying (APS). The actual composition of the as-sprayed coating is La2Ce1.66O4.32, due to the volatilization of CeO2 phase during the spray process. A little decomposition of the LC coating takes place after annealing at 1400℃ for 240h. The thermal conductivity of bulk LC material is about 0.51W/(m·K) at 1000℃, which is one fourth of that of typical bulk YSZ. The coefficient of thermal expansion (CTE) of the LC coating ranges from 10×10-6K-1 to 13×10-6K-1 at the temperature from 450℃ to 1100℃, which is relatively higher than that of the YSZ coating. Dilatometric measurements show that there is slight shrinkage in the coating till 1250℃, however, a remarkable sintering process happens cluring holding period at 1250℃. A spallation of the LC TBC occurs after 60 cycles at 1100℃ by typical delaminating cracking within the LC topcoat.

Key words: thermal barrier coatings, lanthanum-cerium oxide, plasma spraying, thermal cycling

CLC Number: 

  • TG174