Abstract No.:
5271

 Title:
Characterization of plasma-sprayed La0.3Sr0.7TiO3- for high performance SOFC interconnect

 Authors:
Chang-Jiu Li / Xi'an Jiaotong University, P.R. China
Xu Chen* / Xi'an Jiaotong University, P.R. China
Shan-Lin Zhang/ Xi'an Jiaotong University,
Cheng-Xin Li/ Xi'an Jiaotong University,
Guan-Jun Yang/ Xi'an Jiaotong University,
Chang-Jiu Li/ Xi'an Jiaotong University,

 Abstract:
Lanthanum doped strontium titanate (La0.3Sr0.7TiO3-ยด, LST) perovskite is regarded as a promising candidate for SOFC interconnect material due to its good chemical stability, good thermal expansion matching to other components, as well as high electrical conductivity. Plasma spraying is used to deposit LST in which preferetial element evaporation may cause significant composition change and subsequent properties change. In this paper, LST was deposited by plasma spraying using different sizes of LST powders under different conditions. The effects of particle size of LST powders on the chemical composition, phase composition, and electrical conductivity of LST membrane were studied for the compositional optimization of plasma-sprayed LST. The dominant factors over compositional change during plasma spraying are examined. The relationship between LST compositions, microstructure and electrical conductivity is discussed. It is found that through optimization powder particle design and spraying conditions LST of high electric conductivity can be effectively deposited by plasma spraying.

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