等离子数字化熔射成形SOFC核心部件PEN及复阻抗分析

Preparation and Complex Impedance of PEN for SOFC by Plasma Spray Digital Forming

采用等离子熔射与机器人数字化成形技术相结合的方法制备SOFC瓦楞式核心部件PEN。基于交流复阻抗技术对制备的复合电极的电导率进行分析,并与流延法和等离子熔射结合制备的试样对比;采用经典的Arrhenius公式对试样电导率与温度的关系进行定量分析。结果表明,两种工艺制备的试样的电导率均随温度的升高而增大,呈现出明显的NTC效应;与流延和等离子熔射复合的方法相比,等离子数字化熔射成形工艺因为其连续喷涂成形的特点,可以大幅度降低界面接触电阻,提高试样的电导率。

The technology combined the plasma spray, robot digital forming and rapid prototyping was applied to prepare the MOLB-type PEN（positive electrolyte negative） which was the core components of SOFC. The electrical conductivity of composite electrode was analyzed by the AC complex impedance technology, and the conducivity of sample was compared with the one of sample prepared by the technology combined casting and plasma spray. Moreover, the relation of electrical conductivity of samples and testing temperature was researched quantitativly by the classical Arrhenius formula. The results show that the conductivity of sample prepared by two kinds of process mentioned above are increased with increase of the temperature, NTC（negative temerature coefficient） effect of two samples is presented. In particular, comparing with the sample prepared by the casting and plasma technology, the interface contact resistance of sample prepared by plasma spray process is decreased sharply and conductivity of the sample is improved because the process is continuous spray coating.