Improving Formability of Titanium Bipolar Plate via Hot Stamping
摘要
Due to the limited formability of ultra-thin titanium sheet at room temperature, it is difficult to form fine flow channels with increasing geometrical complexity of titanium bipolar plate. Premature occurrence of cracks is commonly observed in conventional room-temperature stamping process, restricting further improvement of the performance of PEMFC. In this work, hot stamping using an on-site resistance heating system is applied to ultra-thin titanium sheet to improve formability of titanium bipolar plate. It is demonstrated that fracture limits of ultra-thin titanium sheet at 700 ℃ are obviously higher than those at room temperature. Finally, a crack-free titanium bipolar plate with fine flow channels is exemplarily formed via hot stamping process.