PMN-PT陶瓷的織構化制備技術研究.pdf

1、武漢理工大學碩士學位論文PMNPT陶瓷的織構化制備技術研究姓名：李東亮申請學位級別：碩士專業(yè)：材料學指導教師：劉韓星20050601武漢理工大學砸上學位論文AbstractAsanew—stylefunctionalmaterialwit|lpromisingapplicationsinmanyfieldsrelaxorferroelectricxPb(Mgu3Nb“3)03一(1x)PbTi03(PMN—PT)singlecrysta

2、lscouldperformhigherdielectric，piezoelectricandelectrostrictiveproperties(001)PMN—PTtexturedpolycrystallinepiezoelectricmaterialsareexpectedtoprovideimprovedpropertiescomparedtountexturedceramics，andlowprocessingcostcomp

3、aredtosinglecrystalsInthispaper(001)platelikeSrTi03andSrBi4Ti4015wereselectedastemplateparticleshighlytexturedPMN—PTceramicshavebeenpreparedbytemplatedgraingrowthwithdirectionalpowdertapecastingandhotpressingCombingwithd

4、33testanddensitymeasure，thecomposion，structureandpropertiesofthePMNPTtexturedceramicshavebeenstudiedsystematicallyInordertoarraytheplatelikecrystallitesalongoneparticulardirection，tapecastingwasadoptedtopreparethegreenta

5、peTheinfluenceofthepropertiesofpowdersandthecontentoftheorganicadditivesofthequalityofthegreentapewasresearched，andtheoptimalcompositionofthetapecastingslurrieswasdeterminedaccordingtodifferentpowdersthroughtapecastingex

6、perimentSeverallayersofthegreentapewerelaminatedandsinteredintoceramicsbyhotpressingandannealsinteringinconLrnonpressureTheresultmakedthatthedensityoftextureceramicswasgood，theelectricalpropertiesoftheorientedsampleappea

7、redanisotropyandthetexturefracturewasabout63％in(0011directionThepiezoelectricconstantwhichachieved480pC／Nin10v01％SrTi03washigherthanthatofrandomsamplesTheglassfritsofPbO，B203andZnOwereaddedintothematrixandanalysedtheinfl

8、uenceonthepropertiesoftextureceramicswithdifferentcontentoffritThedielectriccontantandlosstangentwereraisedandthepiezoelectricpropertiesweredescendedwiththecontentoffritsincreasingButd33ofthetextureceramicswasachieved568

9、pC／Nwith1wt％PbOThisindicatedthattheappropriatefritcanimprovethepiezoelectricpropertyofceramicsinrightcontentOnthebasisoftheabovestudies，PMN—PTtextureceramicswasalsofabricatedwith(001)platelikeSrBi4Ti4015astemplateparticl