| When entering the 21st century, human being is facing the great challenge of realizing continuous development for the economy and society, and it has become the most important worldwide strategic topic is that develop economy under the restriction of the limited resources and strict desire environment protected. With the environment deteriorating and reduction of the one-off energy (such as, coal and petroleum, etc.) resource day by day, a high efficiency and low pollution energy resource is eager required. The Solid Oxide Fuel Cell (SOFC) is a new type generate electricity mode, furthermore, the SOFC has a lot of strongpoint, such as, good adaptability for fuel, fuel can be reformed within cell, not need using the precious metal electrode, good modularity, scale and site fixed very flexible, etc. Therefore, the SOFC has become a very popular research subject in the domain of Fuel Cell.At the present time, for the commercialization operation of SOFC, the main problem is that the fabrication cost is very high, and the power and volume can't give attention to two or more things. The Positive-Electrolyte-Negative (PEN) is the key part of the SOFC. The plasma spray is a rapidly and low cost manufacturing method of high efficiency. Consequently, base on the Rapid Prototype technology and plasma spray processing, the research work of this paper which fabricate the three-dimensional complex shape PEN of SOFC will contribute the energy strategy and continuous development for the economy and society of our country, and have great research value. Base on the foregoing problem, the following aspects research work has been done in this paper.Combine the Rapid Prototype manufacture technology, utilizing the predominance of plasma spray processing which fabricate PEN with big size and complex shape, and based research work on the manufacture process and electrical performance of the one- dimension planar PEN, this paper put forward the method which combine the Rapid Prototype manufacture technology, plasma spray and robot digital forming, and fabricated two-dimension corrugation type and three-dimensional MOLB type of PEN, and analyzed the formability influenced by the process parameter of plasma spray forming, and analyzed the microstructure of PEN. Research work has been done on the planar PEN by the analyze tools SEM and XRD, the result indicate that the PEN fabricated by the plasma spray process satisfy the structure requirement that electrolyte must be compact and electrode need porous, and the chemical constitution of electrode do not change before and after plasma spray, it indicate that the plasma spray process is suitable for fabricating the PEN of SOFC. Using the method of complex impedance spectra analyzed the electrical performance of planar PEN, the result indicate that with the temperature increment, the whole electric resistance, electric resistance of crystal grain and grain boundary all decrescent, and electric conductivity increment. Under the same polarizing voltage, with the temperature increment, the electric resistance decrescent, and electric conductivity increment. These regularities are very coincident with the famous Arrhenius formula. Furthermore, compared with the tape casting process, under the same temperature conditions, the plasma spray process has more advantageous for minishing the electric resistance of PEN.Design and research work has been dong on the two-dimension corrugation type PEN, and analyzed the formability influenced by the process parameter of plasma spray forming. Preliminary design and fabricated a kind of three-dimensional MOLB type SOFC, and the average thickness of anode, electrolyte and cathode are 0.5mm, 20μm and 180μm respectively. For the plasma spray forming of complex shape PEN, it must be selected reasonable process parameter, path of plasma spray and related process conditions. Finally obtained the result of good membrane formability, good thickness distribution of electrolyte and electrode coating, and good porosity of electrode. |
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