03型压电复合材料dlt33gt的数值分析与材料优化制备

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1、摘要通过一系列的分析，制定相应的实验方案，确定以不同的合成方法，辅以⋯定的元素掺杂，制备压电陶瓷粉体。将陶瓷粉体与高分子聚合物PVDF复合，在一定温度和静电场下进行材料极化，制备压电复合材料样品。对不同方案所得复合材料样品进行性能测试表明，经过改良方案后获得材料的压电常数得到了一定程度的提高。关键词：复合模型，0．3复合，压电常数，介电常数，粒度，极化ll茎堡堡三丕鲎!壁主堂垡堡苎Despitetherearemanyinvestigationaroundpiezo-compositematerials，theobstaclestillstandsthere

2、thathowtoenhancethepiezoelectricpropertyofpiezo-composites．Inordertoworkoutthequestion，severalacademiccompositemodelsweresetupaccordingtosomeordinarylawsinthisthesis．sothatdatacanbeanalysistofindouttheoptimizingwaystoenhancethecharacteristicsofthematerial．Accordingtothesemodels，per

3、mittivity,piezoelectricity,Young’smoduleaswellasparticlesizeofthecomponentsaffectedthepiezoelectricityofcompositecommonly．Inordertoraisethepiezoelectricconstantofcomposite，manyaspectsshouldbepaidattentionto．Thepermittivityofcomponentdeterminedtheelectricdistributioninthecomposite，w

4、hichhelduptheelectricfieldwhilepolarizingthematerialorpushing／pullingthematerial．Accordingtonon-organ／organcomposite，sincetheorganparttookonlowerpermittivity,itinclinedtoholdonmostpotential，makingthepiezoelectricityofcompositedeteriorate．Thus，itissignificanttodiminishthepermittivit

5、yofceramicpowdersandtoemploypolymerswithhJ【ghdielectricconstantasthecomponentofpiezo-composite．Norcanfinepiezoelectricitybegainedwhileallcomponentspromptedhighpiezoelectricconstantinpiezo-composite．Thereisagreatdefectivethatthepiezoelectricconstantofceramicsandpolymersholdopposites

6、ymbolwhiletheyarepolarizedatsametime．Thereexist3routinetoovercomethedefective：(a)diminishingthepiezoelectricityofpolymers；Co)raisingthepiezoelectricityofceramicpowders；(c)employingtwicepolarizationprocessing，whichmakesthebothcomponentspromptpiezoelectricconstantwithsamesymb01．Thedi

7、fferenceofelasticmodulebetweencomponentsbroughttolooseconnectivitybetweenthem·Asto0-3typecomposite，thestressesdeliverthroughspacenetworkconstructedbythepolymer．Whereas，thewidegapmoduledelayedthoseinnerstressdelivering-Whilethestresseswerecutdowninceramicparticleswhichtookpartinthei

8、iiAbstradmostpiezoelectric