PMT-PMS-PZT大功率壓電陶瓷的制備及摻雜改性研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文PMTPMSPZT大功率壓電陶瓷的制備及摻雜改性研究姓名：程瑜申請學(xué)位級別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：王一平201103PMTPMSPZT大功率壓電陶瓷的制備及摻雜改性研究iiAbstractPiezoelectricceramicisakeycomponentinultrasonicmotsthatconvertselectricalenergytomechanicalenergyisnecessaryto

2、havehighmechanicalqualityfact(Qm)highpiezoelectriccoefficient(d33)electromechanicalcouplingfact(kp)lowlossfact(tanδ)goodhighpowerproperties.Howeverthe“soft”“hard”propertiesofdinaryPZTceramicsarecontradictytoeachotherPb(M

3、n12Sb23)O3Pb(ZrTi)O3(PMSPZT)basedceramicsisagoodcidatefhighpowerapplicationsduetoitshighQmkp.InourpreviouswktherelaxferroelectricsPb(Mg13Ta23)O3wasintroducedintoPMSPZTtofmaquaternarysystemPb(Mg13Ta23)O3Pb(Mn13Sb23)O3Pb(Z

4、rTi)O3(PMTPMSPZT)goodpropertieswereobtained.HowevermanysuperiacteristicsofPMTPMSPZThavenotbeendiscovered.TherefetheeffectsofcompositionprocessdopingeffectsonthecrystalstructuremicrostructurehighpowerpropertiesofPMTPMSPZT

5、werestudiedtoimprovethepropertiesofthissystem.FirstlytheeffectsofPMTcontentonthepropertiesofPMTPMSPZTceramicshavebeeninvestigatedtheoptimizedcontentofPMTis0.05molinthissystemsecondlythemphotropicphaseboundary(MPB)in0.05P

6、MT0.05PMS0.9PZTceramicswasfoundnearZrTi=4852bychangingtheZrTiratiotheceramicsofthiscompositionpossessgoodproperties:εr=1296，d33=308pCNQm=1557kp=0.55tanδ=0.46%Tc=302CthePEloopspresentedpinchedshapesatlowelectricfieldsbeca

7、useofthepinningeffectofdefectdipolesthedielectricstudyrevealedadiffusephasetransitionbehaviintheceramicsγhadthemaximumvalueneartheMPBthecalcinedtemperaturesinteringtemperaturepolingprocesstothepiezoelectricpropertiesofth

8、eceramicswerealsoinvestigatedtheproperprocessingprocedureoftheceramicsiscalcinedat850Cinteringat1240Cpoledataelectricfieldof4.1kVmmin110Csiliconoilf20minutes.La2O3Yb2O3weredopedintotheceramicstoinvestigatetheireffctsonth

9、eelectricalhighpowerproperties.La2O3improvedthe“soft”propertiesoftheceramicsevidentlythepropertiesoftheceramicswith0.4wt.%dopedLa2O3are:εr=1418，d33=336pCN，Qm=975，kp=0.571tanδ=0.42%。Yb2O3alsoimprovedthe“soft”propertiesoft

10、heceramicstheceramicswith0.5at.%Yb2O3showoptimiumproperties:εr=1164d33=278pCNQm=1243kp=0.547tanδ=0.42%thehighpowertestshowthatthemaximumvibrationvelocitywasashighas0.78msfthiscomposition.Keywds:PizoelectricceramicsPMTPMS