Abstract
High temperature stability of potential materials for thermal barrier coatings becomes increasingly important at elevated temperatures. Therefore, high temperature stability, including phase, compositional, structural, and chemical stability of lanthanum cerate (La2Ce2O7, LC) with yttria stabilized zirconia (YSZ) was investigated after heat treatment at 1300 °C. LC was found to possess excellent phase and compositional stability because of unique fluorite structure. In addition, the mole ration between Ce and La elements was close to 1:1 after prolonged high temperature treatment at 1300 °C. However, LC exhibited poor structural and chemical stability due to poor sintering resistance and severe reaction with YSZ. Rapid grain coarsening and pore-healing were observed. Moreover, interdiffusion reaction between LC and YSZ induced by the large difference in Gibbs free energy values led to the formation of pores with high sintering resistance. Two new materials with pyrochlore and fluorite crystal structures were also present in annealed composite samples.
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