The covalent character of the high performance ceramics used for the fabrication of MMC preforms demands high sintering temperatures to guarantee sufficient interconnection between powder particles. To minimize this cost‐intensive sintering step, several preceramic polymers suitable for binding MMC preform particles were tested with a view to obtaining strong and machinable materials with tailored porosity.
The substitution of La-Sr-ferrites (LSF) with Ni and Cu on the Fesite was investigated with respect to thermal expansion and electrical properties. The thermal expansion is influenced by the stoichiometry as well as by the Ni or Cu substitution. The apparent CTE below 800°C is close to the values for yttria stabilized zirconia, but increased due to the oxygen release at higher temperatures. The conductivity of LSF -also if substituted by Ni and Cu on the Fe site -shows an apparent semi-conductor behaviour, but tend to peak around the SOFC operating temperature. The results indicate the potential of Ni substituted LSF as an SOFC cathode material for operation below 800°C.
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