泡沫铝的熔体发泡法制备及其性能研究

《泡沫铝的熔体发泡法制备及其性能研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、泡沫铝的熔体发泡法制备及其性能研究摘要0r泡沫锅是一种结构和功能～体化的材料√本文采用熔体发泡法，／透跫提关理论分耩帮控秘发遐滠度、搅拌隧阕、爨溢黠闻、诞节发泡裁含黧等铡铸出了孰结构蒸本可控、孔洞分布均匀的闭孔泡沫铝样品。在此基础上，礤究了泡沫铝的动态力学性能以及导逛、导热程电磁屏蔽嚣锈莲饿髓。使用撵普金淼压杆测试了泡沫铝试样的动态压缩性能。实验结果表强，泡沫锤熬聪鼹强发涟着澎交率魏罐热蘧增麴；瘟交黠露钵豺瓣的成变率敏感度影响很小，但是泡沫铝的应变率敏感度不是常数，而是睫饕真应交翦璞热霭耀大，在秘榉的盛变下，夔着寂交率变铯糕度黎增大而增大：泡沫铝的能量吸收随着成变率的增加而增

2、加并且和泡沫铝戆密度鬻关；溅沫铝憋吸能效率睫麓应变率瓣增糖略有下降。研究了泡沫绢的导热系数耩电导鬻与箕徽结构(孔隙率、孔径)的关系，结果表明随着孔隙率的增加，泡沫铝的导热系数、电导率部降鬣，琵在魏豫率慕本耦霹条{孛下琵径辩予泡沫锈韵静热系数与奄嚣率影响很小，可以忽略不计。涎试了淹濠锱翡电磁孱薮效麓。缨果表鹾，在孔径摇避时，熬麓嚣隙率的增大，泡沫铝的屏蔽效能随之下降。幽孔隙牢相近时，随着孔径懿增大，泡沫铝静羼蔌效鼹瞧下降。瑟蓐发见乎对泡沫镪匏爨菠效能笼影响。美键键；泡沫锈凄态艨缩导熬系数窀露牵邀磁鬓激PreparationbytheMeansofMFTandInvestigat

3、ionofthePropertiesofAluminumAlloyFoamAbstraetInthispaperclosed．cellfoamsampleswithbasicallycontrollableporestructureanduniformdistributedporewerepreparedbymeansofmeltfoamingtechnique(MFT)．Byrelativetheoryanalysisandadjustingthecontentoffoamagent，foamingtemperature，stirringtimeandholdtime，me

4、ansofgeRingsampleswithhighqualityhasbeenfound。Onthebasisofthese，propertiesofdynamiccompression，thermalconductivity,electricalconductivityandelectromagneticshieldingoffoamsamples(FS)wereinvestigated．DynamiccompressivepropertiesofFSweretestedusingsplitHopkisoncompressivebar．Theresultsshowedth

5、atyieldingthestrengthincreasewiththestrainrate，theenergyabsorptionincreasewithincreasingstrainrateandwasrelatedtothedensity．StrainhasslightlyeffectOnthestrainratesensitivityofthesolidmaterial，butthestrainratesensitivityofFSjncreasewithincreasingtruestrainandalsoincreasewithincrementalchange

6、instrainrate鑫tthesametruestrain．Thepropertiesofthermalconductivity,electricalconductivityandelectromagneticshieldingwerestudied．ThethermalconductivityandelectricalconductivityhavebeenbothfoundtOdecreasewithdecreasingporosity,buttheinfluenceofcelldiameteronthesepropertiesisalmostnegligible．T

7、heexperimentalresultsofelectromagneticshieldingshowedthatitsvaluesaredependonporosityandeelldiameter,withtheincreaseofporosityandeelldiameter,thepropertyofelectromagneticshieldingdecrease．Keywords：aluminumalloyfoam，dynamiccompression，thermalconductivity,