- 學位論文
石墨/環氧樹脂複合材料導電板之製程與性質研究
Study on the Manufacture Process and Property of Graphite/Epoxy Composite Conductive Plates
摘要
本研究主要分為二階段探討石墨/環氧樹脂導電複合板之製程及其性質：首先是在石墨基材中加入熱固性環氧樹脂為黏結劑，均勻混合後以熱壓成型法製做成厚度為2mm的導電複合板。並研究樹脂含量對導電複合板之機械、電導、氣密及熱傳導等重要性質的影響。實驗結果顯示：環氧樹脂含量是影響複合材料電導及機械性質的主要因素。由實驗數據顯示，隨著環氧樹脂添加量由5%到20%的改變，其抗拉強度在7.77-12.3MPa間、氣體流速在0.138-0.0103ml/s間、密度在1.74-1.68g/cm3、熱傳導在15.98-4.26W/mk間、導電性在92.11-43.33S/cm間。其中樹脂含量10%的複合板的綜合性能較佳，故以此成份壓製成複合雙極板，並組裝成單電池，測量其I-V曲線與I-P曲線。接著研究以樹脂含量10%的複合板材中加入其他導電物來提高其導電性能。其中導電物包括不鏽鋼絲、銅絲、1.5k及3k絲/束的單纖碳纖維。並分別檢測此導電複合板之機械、電導、氣密、熱傳導等重要性質。由實驗數據顯示，導電性以加入1.5k絲/束碳纖維的導電複合板的213.26 S/cm最佳。抗拉強度以加3k絲/束碳纖維的導電複合板的21.5 MPa最佳。熱傳導以加1.5k絲/束碳纖維的導電複合板的12.84W/mk最佳。
並列摘要
There are two principal parts in this study. The first, the thermosetting epoxy resin was intermixed into the substrate of graphite powder as binder. The thickness of 2mm epoxy/graphite composite plates made of this homogeneous mixture were completed by hot pressing method. By changing the resin content, the inspection of the properties of mechanical, electrical conductivity, air tightness and thermal conductivity of the bipolar plate were complete. From the experiment result, it is revealed that the quantity of the epoxy resin seriously affects the conductivity and mechanical properties of the composite. From the experimental data, with the increase of resin content from 5% to 20%, the tensile strength change from 7.77 to 12.3 MPa, the flow rate from 0.138 to 0.0103 ml/s, the density from 1.74 to 1.68 g/cm3, the thermal conductivity from 15.98 to 4.26 W/mk and electrical conductivity from 92.11 to 43.33 S/cm. All of these composites, the one of resin content of 10% have fitter properties for bipolar plates. Consequently this composite was chosen to be bipolar plate, and the characteristic I-V curves and I-P curves of the fuel cells assembled by the composite bipolar plate of this composition were completed. The second, the bipolar plates with 10% of resin were chosen to be added different conductive materials to enhance their properties. The selected conductive materials were copper wire, stainless steel wire, and carbon fiber of 1.5k and 3k yarns/bundle. The tensile strength, electrical conductivity, air tightness and thermal conductivity of the composite plates were detected. From the experimental data, the composite bipolar plate, which was added 1.5k yarns/bundle carbon fiber, had best conductivity and greatest thermal conductivity, and the value was 213.26 S/cm and 12.84W/mk, respectively. The fiber composite plate, which was added 3k yarns/bundle carbon fiber, had the highest tensile strength, and the value was 21.5 MPa.