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ID:37376669
大小:755.95 KB
页数:11页
时间:2019-05-22
《石墨-酚醛树脂复合材料双极板》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、石墨/酚醛树脂复合材料双极板1陈惠,刘洪波,夏笑虹,杨丽,何月德(湖南大学材料科学与工程学院,长沙,410082)摘要:采用模压热固化二步法,以酚醛树脂为粘结剂、天然鳞片石墨为导电骨料、炭黑为添加剂制备质子交换膜燃料电池用的复合材料双极板。系统地研究了不同种类石墨对石墨/酚醛树脂复合材料电性能和抗弯强度的影响。结果表明,天然鳞片石墨为导电原料时,所制备的石墨/酚醛树脂双极板的性能最好。实验结果还表明:添加导电炭黑能有效地提高石墨/酚醛树脂复合材料的电导率;在复合材料制备中加入4wt%的碳纤维,碳纤维-石墨/酚醛树脂复合材料的抗
2、弯强度提高了29%,碳纤维表面液相氧化处理能有效提高纤维与基体间的结合强度,随着处理时间的延长与处理温度的升高,碳纤维-石墨/酚醛树脂复合材料的电导率和抗弯强度都有很大程度的提高;最终固化温度主要影响酚醛树脂的交联程度,随着最终温度的升高,酚醛树脂的交联程度增加,电导率增大,但抗弯强度有一定程度的减小。关键词:燃料电池;双极板;复合材料;天然石墨;聚合物;电导率;抗弯强度中图分类号:TB331,TB332文献标志码:AGraphite/resincompositebipolarplateCHENHui,LIUHongbo,XI
3、AXiaohong,YANGLi,HEYuede(MaterialsscienceandengineeringcollegeofHunanuniversity,,Changsha410082)Abstract:Thecompositebipolarplateforprotonexchangemembranefuelcell,resinasabinder,naturalgraphiteastheconductiveaggregate,carbonblackasadditive,usedthemoldingandthermoset
4、tingtwo-stepmethod.Theeffectsofgraphitespeciesontheconductivepropertiesandtheflexuralstrengthofthegraphite/resincompositeswereinvestigatedandanalyzedsystematically.Theresultsshowthattherewillbethebestperformancewhenthenaturalflakegraphitewasusedasconductiverawmateri
5、al.Theelectricalconductivityofthegraphite/resincompositescaneffectivelybeimprovedifconductivecarbonblack(CB)isadded.Inthepreparationofgraphite/resincomposites,ifadding4wt%carbonfiber,theflexuralstrengthofthecarbonfiber-graphite/resincompositesbipolarplatesisimproved
6、by29%.Theliquidphaseoxidationprocessingofcarbonfibersurfacecaneffectivelyimprovethebondingstrengthbetweenthefibersandmatrix.Withtheextendingprocessingtimeandelevatingprocessingtemperature,flexuralstrengthandelectricalconductivityofcompositesaregreatlyimproved.Thefin
7、alcuringtemperaturemainlyaffectesthecross-linkingdegreeofresins.Withhigherfinaltemperature,resincrosslinkingdegreegetsincreased,andtheconductivityincreaseswhileflexuralstrengthdecreases.Keywords:fuelcells;bipolarplates;composite;graphite;polymers;electricalconductiv
8、ity;flexuralstrength收到初稿日期:2014-06-10;录用日期:2014-07-18;网络出版时间:2014-08-2716:02网络出版地址:http://www.cnki.net/kcms/detail/11.1801.TB.20140827.160
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