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首页> 外文期刊>Rapid prototyping journal >Fabrication of modified graphite bipolar plates by indirect selective laser sintering (SLS) for direct methanol fuel cells
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Fabrication of modified graphite bipolar plates by indirect selective laser sintering (SLS) for direct methanol fuel cells

机译：通过直接甲醇燃料电池的间接选择性激光烧结（SLS）制备改性石墨双极板

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Purpose - The purpose of this paper is to produce electrically conductive, fluid impermeable graphite bipolar plates for a direct methanol fuel cell, using indirect selective laser sintering (SLS) and suitable post processing techniques. Design/methodology/approach - Bipolar plates are made by the indirect SLS of graphite powder and phenolic resin mixture. The phenolic resin binder is then burnt off at a high temperature in a vacuum furnace to produce a 100 per cent carbon part. This brown part is then infiltrated using a low viscosity (～5-10 cps) cyanoacrylate to seal up the open pores, rendering the plates fluid impermeable. Findings - It has been found that the electrical conductivity increases significantly (> 220 S/cm) with a corresponding increase in pyrolyzing temperature which correlates well with literature on the carbonization of phenol formaldehyde resins. The cyanoacrylate-infiltrated parts tested under fluid pressure demonstrated no leakage through the plate, indicating full closure of open porosity. Originality/value - This work demonstrates the capability of the SLS process to produce working bipolar plates with complex flow field designs that can be tested to verify its efficacy in a working fuel cell, thereby saving time and cost in machining natural graphite.
机译：目的-本文的目的是使用间接选择性激光烧结（SLS）和合适的后处理技术来生产用于直接甲醇燃料电池的导电，不透液性石墨双极板。设计/方法/方法-双极板由石墨粉和酚醛树脂混合物的间接SLS制成。然后在真空炉中高温烧掉酚醛树脂粘合剂，以产生100％的碳。然后使用低粘度（约5-10 cps）的氰基丙烯酸酯渗透此棕色部分，以密封开口的孔，使板不透水。发现-已经发现电导率随着热解温度的相应增加而显着提高（> 220 S / cm），这与有关酚醛树脂碳化的文献非常相关。在流体压力下测试的被氰基丙烯酸酯渗透的零件显示没有通过板的泄漏，表明完全封闭了开放的孔隙。原创性/价值-这项工作证明了SLS工艺能够生产具有复杂流场设计的工作双极板，可以对其进行测试以验证其在工作燃料电池中的功效，从而节省了加工天然石墨的时间和成本。

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