等的研究表明随着的增加介电常数和...

更新时间:2023-06-04 04:42:03 阅读: 评论:0

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摘要
功率型压电陶瓷的应用日益广泛,如近年来迅速兴起的压电马达、压电驱动器、压电变压器、换能器等。作为大功率用压电陶瓷材料一般要求具有尽可能大的机电耦合系数(K窿O.5andK3I兰o.3)和压电常数(d33_>350pC/Nand—d3l->100pC/N),高的机械强度、高的机械品质因子(Qn2>500)、较小的介质损耗(tanS<0.005)和高功率密度。在此基础上同时也要兼顾时间和温度稳定性。
锑锰锆钛酸铅系压电陶瓷xPb(Mnl/3Sb2rs)03-yPbZr03-zPbTi03(PMS-PZ—PT)的特点是机电耦合系数可在很宽的范围内调节,Qm值最高可达到5300,介质损耗小,谐振频率的时间温度稳定性好,因此本文针对该体系,通过调节锆钛比来探究压电性能良好的材料配方。并在此基础上通过硬性镍掺杂和软性铌掺杂来优化材料的性能,并探讨了组分具有优良性能的原因。在压电器件的使用过程中,压电陶瓷的工作温度是不断变化的,压电陶瓷的各项性能也将随着温度变化,有时这种变化会使压电陶瓷器件不能工作。压电陶瓷长期工作,其机电性能(尤其是压电性能)不可避免的出现老化。因此本文研究了锆钛比和掺杂对PMS—PZ.PT三元系压电陶瓷性能和其温度稳定性的影响,并探讨了其温度稳定性的机理。同时又研究了掺杂对陶瓷材料老化性能的影响。
实验结果表明:对于PMS—Pz—PT三元系压电陶瓷,调整ZffTi比,在三方一四方准同型相界附近四方相区,当锆钛比为50:50(PMS50)时,体系性能达到:K。=O.63,K3l-O.36,Q。=1215,d33=401pC/N,一d3t=124pC/N。随锆钛比的增加,体系的相结构从四方相到四方和三方共存最后变为三方相。适量的硬性镍掺杂能显著提高体系的电性能,当NiO掺杂量为0.2mol%时,体系的性能为:K。=0.68,K3l=O.40,Q。=1360,d33=506pC/N,一d31=172pc/N。而Nb掺杂对材料电性能的提高不大。PMS—PZ.PT三元系陶瓷在准同型相界附近靠近四方相时,其压电性能的温度稳定性较好;而在三方相时,压电系数随温度的波动则较大。Nb“离子掺杂剂,改善了PMS-PZ-PT体系的温度稳定性能,.20"C~100。C,相对室温时的最大频移从1.43%降为0.54%;机电耦合系数(△K3t/K3]25"C)从。5.41%降为一1.72%;同时压电常数d3l的温度系数(△d3l/d3t25t)从15%降到6%。镍掺杂对压电系数d。I温度稳定性有较大的改善,压电常数d3l的温度系数下降到3.0%,但对于谐振频率和机电耦合系动名词作主语
上海大学硕士学位论文:大功率PMS,PZ.PT体系压电陶瓷机电性能的稳定性研塞
数的温度稳定性改善不大。硬性镍掺杂剂使PMS-PZ—PT三元系压电陶瓷压电性能抗老化性能改善。热处理能显著改善PMS—PZ—PT三元系压电陶瓷的压电老化特性。老化后对材料的机电
耦合系数(K及K。I)和谐振频率的温度稳定性有一定的改善。老化机理研究表明:较低温度压电常数老化较慢,老化行为遵从延伸指数定律,老化机理与材料本身的晶体缺陷(主要是氧空位)有关。较高温度下的老化行为符合时间对数直线规律,老化机理与电畴运动有关。cpa是什么证书
组分PMS50及在其基础上通过改性而得到了性能优良的压电陶瓷PMS50+0.1m01%Nb205,PMS50+0.2m01%NiO。后者不仅压电性能优良,而且热稳定性良好,其综合性能优于以往文献报道的同体系压电陶瓷,可以满足了大功率压电器件的使用要求。
关键词:大功率,压电陶瓷,PMS.PZ.PT,掺杂,温度稳定性,老化
II
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滨才教育Abstract
Piezoelectricceramicsissuccessfullyappliedinmanyareas.Amongthem,thehigh.powerceramicsanditsapplicationswillremainahotsubjecttobeconcerned.To
原因的英文meettherequirementsofhigh—powerdevicessuchaspiezoelectricmotors,piezoelectrictransforlnersandultrasonictransducers,itisdesirablethatthepiezoelectricceramicshashighpiezoelectricconstant,highelectromechanicaIcouplingfactor,highmechanicalqualityfactor,andlowinsertloss.Onthebasisofthoseproperties,possiblyhighpower
andmechanicalstrength,aswellasexcellenttemperaturestability,arealsodensity
required.
xPb(MnmSb2n)03-yPbZr03一zPbTi03(PMS—PZ—PT)ceramicsareexcellenthighpowerpiezoelectricmaterials,IthasnotonlyveryhighQmandKp,butalsogoodtemperaturestabilityatresonantfrequencyandlo
wdielectricinsertloss.Inthispaper,inordertolookforthecompositionswimexcellentpiezoelectricpropertiesandhightemperaturestability.PMS—PZ—PTternarypiezoelectricceramics,locatedinthevicinityoftheMPB,wereinvestigated.Themechanismofthetemperaturedependenceofpiezoelectricpropertiesisdiscussed.Onthebasisofthestudymentionedabove,compositionswithsmalldopantwerechosentooptimizepropertyofthesystem.
Inaddition,thepropertiesofpiezoelectricceramicsfluctuatewiththechangeoftemperaturedwingtheoperatingofthedevices,sometimes,whichwilldebasethecharacteristicsofthedevices。Fromthispointofview,theinfluencesofthedopantsandZr/TiratioottthetemperaturestabitttyofPMS—PZ—PTcerarrti_cswereinvestigated、Moreoverthemechanismofthetemperaturestabilitywasdiscussed.
TheMorphotropicphaseboundary(MPB)inPMS—PZ—PTsystemwasobservedintheregionofO.50<x<0.52.ThephasetransitionofthePMS—PZ—PTcompositionsfromtetragonalphasetocoexistenceoftetragonalandrhombohedralphasesandfinallytorhombohedralphasewiththeincreasingZrcontents.ThepiezoelectricconstantandelectromechanicalcouplingfactorsofthePMS—PZ--PTceramicsintetragonalphasearemorethermallystable,whilethoseintherhombohedralphasestronglyincreasewithtemperature.TheternarysystemofPb098Sr002(MnlaSb20)o05Zr05Tios03+0.2wt%Ce02,whichislocatedintetragonalphase,offersexcellentpiezoelectricpropertiesandhigh
III
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50:50(PMS50),thepropertiesareasternF。eraturestability.WhentheZr/Tiratiois
梦工厂动画电影大全follows:d33=401pC/N.一d31=124pC/NKp=0.63,K31;0.36,Qm21215,and£r51180·ResultsshowthattheNi—dopingnotonlyobviouslyoptimizedpiezoelectricpropertiesofthesystem,butalsoimprovedthetemperaturestability.ButtheNb—dopinghaslittleeffectonpiezoelectricpropertiesofthesystem.WithNiOdopingamountsbeing0.02m01%,optimizedpiezoelectricpropertiesford33,一d31,Kp,K3l,andQmare506pC/N,172pC/N,0.68,0.40,1360respectively.Nb—dopingcanimprovedthetemperaturestabilityofthePMS—PZ—PTsystem.Thestabletemperaturedependenceofresonantfrequency,electromechanicalcouplingcoefficientK3]andpiezoelectricconstan
td3zwasobtained.From-20℃to100℃,themaximumchangesoftheresonantfrequency(△f/f250,electromechanicalcouplingfactorK-31(AK31/'K3125-c),andpiezoelectricconstantd31(&d3t/d3125℃)are1,43%,一5.41%,15%respectively,andafteraddNb—dopingtothesystem,thoseareO.54%,一1.72%,6%respectively.TheNi—dopingcanimprovethetemperaturestabilityofpiezoelectricconstantd31,whichis3%.TheinfluencesofNi—dopingandNb—dopingonthepiezoelectricandthedielectricagingbehaviorsofPMS—PZ—PTceramicswereinvestigated.Resultsshowthatwhentheagingtemperatureisbelow100。C,theagingbehaviorofpiezoelectricanddielectricconstantfollowsthelinearlogarithimictimelaw,whiletheagingtemperatureis150℃or200℃.theagingbehaviorofpiezoelectricanddielectricconstantabidebythestretchedexponentiallaw.AttheSanletime,
goal什么意思theeffectofpre—heat-treatmentforPMSN2ceramicsontheagingbehaviorofthesystemwasstudied
ThecompositionPMS50,thePMS50+O.1m01%Nbz05andthePMS50+0.2m01%NiO,exhibitexcellentproperties.ThePMS-PZ—PTwithNi—dopingceramicsobtainednotonlyexcellentpiezoelectricproperties,butalsogoodtemperaturestability.The
cnc是什么
canbeadoptedtoimprovethetemperaturestabilityandagingpre··heat·-treatment
behaviorsofthePMS—PZ-PTsystem.SothemodifiedPMS—PZ—PTceramicscanachieve
therequirementsforapplicationofhigh—powerpiezoelectricdevicessuchasultrasonic
motorseta1.
caac是什么意思
smx上海大学硕士学位论文:大功率PMS.PZ.PT体系压电陶瓷机电性能的稳定性研究
Keywords:High—power;Piezoelectricceramics;PMS—PZ—PT;Temperaturestability;
Aging
>long long way to go

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