超临界流体制备中间相沥青基泡沫炭及导热性分析

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1、东华大学硕十学位论文超临界流体制备中间相沥青基泡沫炭及导热性研究壁厚15一100林m、孔隙率91%以上、开孔率高的泡沫炭，在此基础上，对不同孔结构的泡沫炭的导热性能进行研究。利用已有的多孔材料中常用的分形理论分析了所制备炭材料的导热特性，尝试推导出并应用泡沫炭的面积分形堆数，构建了当量元泡根据截面分形空隙分数，提出了一个计算泡沫炭导热率的模型，并以此计算出泡沫炭的导热系数并和实验中得到的数据进行对比。关键词:中间相，泡沫炭，超临界流体，导热东华人学硕十学位论文超临界流体制备中间相沥青基泡沫炭及导热性研究StUdyoftheThermalC

2、onductivityofMesoPhasePitch一basedCarbonFoamPreParedwithSuPereritiealFluidABSTRACTMesoPhasePiteh一basedeathonfoam，PreParedfrommesoPhasePiteh，besidesthelowdensity，eorrosionresistaneeandsmallthermalexPansioneoeffieientliketheearbonfoamsderivedfromotherPreeursors，hashightherma

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4、thelawthatdifferentsuPercritiealfluidseffeetthestructureofthecarbonfoam，weeouldfindtheregulationoftheearbonfoamstruetureandligamentstrueturebymixedsolvents.ThePoreandligamentstruetureofearbonfoamformedunderdifferenteonditionswasstudied:Pressure，temPerature，solventsortando

5、therfaetors.TheehangesofthethennalProPertiesafterearbonizationandgraPhitewereresearched.ThedePendeneeofthennalProPertiesofcarbonfoamonitsPoreandligamentstrueturewasanalyZed.It15foundthatthemixedsolveniseouldhaveagoodsolubilitywithmesoPhaseandimProvethe东华大学硕士学位论文超临界流体制备中间相

6、沥青基泡沫炭及导热性研究homogeneity.Atthesametime，thebubblediametereanbeeontrolledeasily.Byehoosingdifferent而xingratioofthesuPercritiealfluid，wecangetearbonfoamwithdensityintherangeof0.01司.5叭m，，uniformsizedistributionbetween150一1100林m，wallthieknessof15一100卿，Porosityofgl%ormore·Thethe

7、rmalProPertiesofearbonfoamhavebeeninvestigatedandthemeeh耐smofthethermaleonduetivitywasanalyZedonthemodelofthennaieonduetivityrelatedtodifferentPorestructure.Thecarbonfoamthennaleonduetivitycaleulationmodelhavebeenestablishedtocaiculatcthethermaleonductivitywhichwascom脚耐wi

8、ththeexPerimentaidata.KEYWORDS:MesoPhase，Cart幻nfoam，SuPercritiealfluids，Thermaleonductivity.(Mat