Based Micro-Flow Extrusion Of Sofc Integration Forming Process Simulation And Optimization

After the energy crisis1970s,many countries began to look for new sources of energy to replace traditional fossil and coal fuel.At the same time,facing the increasingly serious environmental problems, the climax of the development of high-efficient, renewable, green-energy products emerged world wide. Thus, it creates the environment and opportunities for the development of Solid Oxide Fuel Cell (SOFC) appearance.SOFC is an all solid-state energy conversion device, and the raw materials of its anode, cathode and electrolyte layers are non-metallic ceramic powder which should be working under the temperature range from600℃to1000℃. In the condition of high temperatures, SOFC has high energy conversion efficiency, and it is a great energy supply device with the advantages of environmental,high performance and long-duration. Nowadays many countries are carried out SOFC research around the world.First, this thesis studied the domestic and foreign researches of SOFC, and briefly rewarded the structure, elements and materials of SOFC. Then, from the aspect of unit element preparation, the key problem in SOFC development is analyzed, and the micro-fluidic extrusion forming method for the preparation of the SOFC body is selected, to explore the application prospects of the new preparation technology in the SOFC development.Secondly, this thesis also completes the theoretical and application research on micro-fluidic extrusion forming method, and analyzes its application in ceramic plastic molding. The research includes(1) the analysis of the impact of the rheological properties of the ceramic slurry on its extrusion flow;(2) the analysis and formation of the basic equations of viscous fluid slurry which is involved with continuity equation, motion equation and energy equation;(3) the establishment of viscosity model of forming slurry; and (4) the analysis the influential factors of micro-flow extrusion precision. Thus, the theoretical support for the following forming process analysis and optimization is provided.Finally, the thesis uses Visual C++and ProE to create a parametrical three-dimension extrusion model and uses ANSYS FLOTRAN to analyze the impacts of drainage section, shunt section, compression section and straight section of extrusion mold top on extrusion flowing based on the objective sections of extrusion mold top in modeling partition. Then, based on the results of the finite element analysis, the optimization of geometric structure of process parameters and the extruder is completed by using APDL parametric language.