石墨复合双极板浆料流延工艺研究

Study on Slurry Tape Casting Technology of Graphite Composite Bipolar Plate

采用流延法制备石墨复合双极板,以电导率和力学性能为主要指标,结合电子显微镜(SEM)表征技术分析,研究了浆料黏度、浆料温度、流延速度、刮刀高度和液面高度,对双极板生坯的流延工艺进行研究。结果表明,浆料适宜流延黏度为5500~6500 m Pa·s,浆料流延温度为35~40℃,流延速度为0.5~0.6 m/min,刮刀辊高度为1.2~1.4 mm,液面高度为2.5~3.5 cm,此时流延出的双极板生胚致密度高、黏附均匀、表面光洁、平整度高。

Graphite composite bipolar plate was prepared by tape casting method. With electrical conductivity and mechanical properties as the main indexes, combined with Scanning Electron Microscopy(SEM) characterization technology, the slurry viscosity, slurry temperature, tape casting speed, scraper height and liquid level height were explored to study the tape casting process of the green billet of bipolar plate. The results show that, the suitable slurry viscosity is 5 500~6 500 mPa·s, the slurry temperature is 35~40 ℃, the slurry velocity is 0.5~0.6 m/min, the scraper roll height is 1.2~1.4 mm, and the liquid level height is 2.5~3.5 cm. In this case, the fluidized plate has high density of embryos, uniform adhesion, smooth surface and high smoothness.