0.4catio3-0.6(li12nd12)tio3微波介质陶瓷的低温烧结工艺研究

《0.4catio3-0.6(li12nd12)tio3微波介质陶瓷的低温烧结工艺研究》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、河南科技大学毕业设计（论文）0.4CaTiO3-0.6(Li1/2Nd1/2)TiO3微波介质陶瓷的低温烧结工艺研究摘要本文研究了烧结助剂BaCu(B2O5)（BCB）和烧结助剂2ZnO-B2O3玻璃（ZB）对0.4CaTiO3-0.6(Li1/2Nd1/2)TiO3（CLNT）介质陶瓷的烧结特性、相组成、微观形貌及介电性能的影响。通过LRC、XRD、SEM等实验设备检测CLNT陶瓷样片的介电性能、相组成、微观形貌，结果表明：添加少量的BCB能使CLNT陶瓷的烧结温度从1300ºC降低至1050ºC。随着BCB添加量的增加，

2、介电常数下降，频率温度系数向负值偏移。添加4wt%BCB的CLNT陶瓷在1050ºC烧结2h，获得了最佳的介电性能：εr=96.5，tanδ=0.017，τf=-13.6ppm/ºC，满足高介多层片式微波元器件的设计要求。添加少量的ZB玻璃能使CLNT陶瓷的烧结温度从1300ºC降低至950ºC。随着ZB玻璃添加量的增加，介电常数先增大后减小，频率温度系数先趋于零后向负值偏移，介电损耗先下降后趋于稳定。添加3wt%ZB玻璃的CLNT陶瓷在950ºC烧结2h，获得了最佳的介电性能：εr=91.13，tanδ=0.0133，τf

3、=10.5ppm/ºC，满足高介多层片式微波元器件的设计要求。关键词：微波介质陶瓷，液相烧结，介电性能，钙钛矿，掺杂26河南科技大学毕业设计（论文）LOWTEMPERATURESINTERINGOF0.4CaTiO3-0.6(Li1/2Nd1/2)TiO3MICROWAVEDIELECTRICCERAMICSABSTRACTTheeffectsofBaCu(B2O5)(BCB)and2ZnO-B2O3glass(ZB)onsinteringbehavior,phasecomposition,microstructureand

4、dielectricpropertiesof0.4CaTiO3-0.6(Li1/2-Nd1/2)TiO3(CLNT)microwavedielectricceramicswereinvestigated.Itisdetectionphasecomposition,microstructureanddielectricpropertiesofCLNTmicrowavedielectricceramicsbyLRC,XRDandSEMinstruments.ItwasfoundthatasmallamountofBCBaddit

5、iveloweredthesinteringtemperatureofCLNTceramicseffective-lyfrom1300ºCto1050ºC.Thedielectricconstant(εr)decreasedandthetemperaturecoefficientofresonantfrequencyshiftedtoanegativevaluewiththeadditionofBCB.CLNTceramicswith4wt%BCBsinteredat1050ºCfor2hshowedtheoptimumdi

6、electricproperties:εr=96.5,tanδ=0.017,andτf=-13.6ppm/ºC,whichsatisfiesthedesigndemandofhighdielectricconstantandmultilayermicrowavecomponents.ThesinteringtemperatureofCLNTceramicswaseffectivelyloweredfrom1300ºCto950ºCbyaddingasmallamountofZBglass.WiththeadditionofZ

7、Bglass,thedielectricconstant(εr)increasedfirstandthendecreasedandthetemperaturecoefficientofresonantfrequencyshiftedtozeroandthentoanegativevalueandthedielectriclossdecreasedandthentothestable.TheCLNTceramicswith3wt%ZBglasssinteredat950ºCfor2hshowedtheoptimumdielec

8、tricproperties:εr=91.13,tanδ=0.0133,andτf=10.5ppm/ºC,whichmeetstherequirementsofthehighdielectricconstantmaterialsformultilayermicrowavecomponent