摘要 本研究旨在使用改質酚醛樹脂與導電碳化物以塊狀模造成型(Bulk Molding Compound , BMC)加工方式備製複合材料導電雙極板。其中導電碳化物包括石墨、鍍鎳石墨、鍍鎳碳纖維、碳奈米管等。並改變導電碳化物的添加比例,分別測試其導電度、氣體滲透率、機械性質、導熱度、熱膨脹係數、防火耐燃性等重要的參數。 綜合比較四種導電碳化物所測得的性質;導電率以含鍍鎳覆碳纖維的複合材料導電雙極板的31(S/cm)~ 195(S/cm)之間最佳。熱傳導係數以含碳奈米管的複合材料導電雙極板的54.6 (W/m-K) ~ 63 (W/m-K) 之間最佳。氣體滲透率以含碳奈米管的複合材料導電雙極板的1.07*10^-6 (mL/cm^2-sec) ~ 9.68*10^-8 (mL/cm^2-sec) 之間最佳。抗折強度以石墨的複合材料導電雙極板的95(Mpa) ~ 122(Mpa)之間最佳。耐衝擊強度以含鍍鎳碳纖維的複合材料導電雙極板的2.0(lb/ft-in)~ 3.9(lb/ft-in)之間最佳。孔隙度以含鍍鎳石墨的複合材料導電雙極板的2.8 %~2.98 % 之間最佳。比重以含鍍鎳石石墨的複合材料導電雙極板的1.63 ~ 1.75之間最佳。尺寸安定性以含鎳披覆碳纖維的複合材料導電雙極板的0.17 ~ 0.34 %之間最佳。表面粗糙度以含有碳奈米管的複合材料導電雙極板的2.09 ~ 8.92μm 之間最佳。由耐腐蝕性質分析可知複合材料導電雙極板具有抗腐蝕性,腐蝕電流皆小於10-6 Amps/cm2。熱膨脹性質方面,以含有鍍鎳碳纖維的複合材料導電雙極板的72.08 ~ 16.47 μm/m℃ 之間最佳。利用導電碳化物;石墨、鍍鎳石墨、鍍鎳碳纖維、碳奈米管備製複合材料導電雙極板均具有防火難燃性質,符合UL-94V0及 L.O.I>50。
ABSTRACT Electrical conductive bipolar platse for fuel cell prepared by phenolic resin modified by conducting filler with Bulk Molding Compound (BMC). The conductive fillers used wes graphite, nickel-coated graphite powder(Ni-Graphite) and nickel-coated carbon fiber (Ni-Carbon fiber) and carbon nanotube(CNT). The electricat conductivity bipolar plate with the nickel-coated carbon fiber content increase from 31S/cm(2wt%)to 195S/cm(8wt%) and the electricity conductivity with the Ni-Graphite content increased from 0.56S/m(5wt%) to 1.57S/cm(30wt%). Thermal conductivity of the bipolar plate increase from 54.6W/m-K to 63W/m-K white CNT content from 0.1phr to 0.3 phr. Oxygen permeability decreass from 1.07 x 10-6 mL/cm2-sec to 9.68 x 10-8 mL/cm2-sec white CNT content 0.01phr to 0.3 phr. The limiting oxygen index(L.O.I.)and the UL-94 test revealed that the bipolar plate possesses excellent flame retartance which L.O.I. > 50 and UL-94 to conform to UL-94V0.