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1、·?·无机材料学报?卷文章编号:1000-324X(2008)0?-0???-0?Ca0.3(Li1/2Sm1/2)0.7TiO3微波介质陶瓷的低温烧结研究李月明1,宋婷婷1,尤源2,胡元云2,刘维良1,唐春宝1(1.景德镇陶瓷学院,江西景德镇,333001;2.浙江正原电气股份有限公司,浙江嘉兴,314003)摘要:采用传统陶瓷制备工艺,制备了掺杂Na2O–CaO–B2O3(NCB)氧化物的Ca0.3(Li1/2Sm1/2)0.7TiO3(CLST)陶瓷,研究了NCB掺杂量与晶相组成、显微结构、烧结
2、性能及微波介电性能的关系。研究结果表明复合氧化物NCB掺杂量在1~15wt%范围内没有杂相生成,晶相仍呈斜方钙钛矿结构。随着NCB添加量的增加,陶瓷致密化温度和饱和体积密度降低,介电常数εr、无载品质因数与谐振频率乘积Qf值也呈下降趋势,频率温度系数τf向正方向增大。NCB氧化物掺杂能有效地将CLST陶瓷的烧结温度由1300℃降低至900℃。添加12.5wt%NCB的CLST陶瓷在低温900℃烧结5h仍具有良好的微波介电性能:εr=73.7,Qf=1583GHz,τf=140.1ppm/℃,满足高介多
3、层微波器件的设计要求。关键词:Ca0.3(Li1/2Sm1/2)0.7TiO3;Na2O–CaO–B2O3;低温烧结;微波介质陶瓷中图分类号:TM227文献标识码:AResearchonLow-temperatureSinteringofCa0.3(Li1/2Sm1/2)0.7TiO3MicrowaveDielectricCeramicsLiYue-ming1,SongTing-ting1,YouYuan2,HuYuan-yun2,LiuWei-liang1,TangChun-bao1(1.Jingd
4、ezhenCeramicInstitute,Jingdezhen,333001,China;2.ZhejiangZhenyuanElectricCo.Ltd.,Jiaxing,314003,China)Abstract:TheNCB(Na2O–CaO–B2O3)-dopedCa0.3(Li1/2Sm1/2)0.7TiO3(CLST)ceramicswerefabricatedviathetraditionalceramicprocess.TherelationbetweenNCBdopantconte
5、ntsandthecrystalstructure,microstructure,sinteringbehavior,anddielectricpropertiesofCLSTceramicswereinvestigatedsystematically.Theresultsindicatethatthesecondphasesarenotfoundwithin1~15wt%rangeofNCBdopantcontentsandthemajorphaseofCLSTceramicsisstillorth
6、orhombicperovskite.WiththeincreaseofNCBcontent,thedensificationtemperatureandbulkdensityofCLSTceramicsdecrease,thedielectricconstantεrandtheproductofqualityfactorandresonancefrequencyQfvaluealsodecrease,andthetemperaturecoefficientofresonantfrequencyτfi
7、ncreasestopositive.NCBcaneffectivelydecreasethesinteringtemperatureofCLSTfrom1300℃to900℃.ThesampleofCLSTwith12.5wt%NCBsinteredat900℃for5hstillhasexcellentdielectricproperties:εr=73.7,Qf=1583GHz,τf=140.1ppm/℃.Thedesigndemandofhighdielectricconstantandmul
8、tilayermicrowavecomponentsaresatisfied.Keyword:Ca0.3(Li1/2Sm1/2)0.7TiO3;Na2O–CaO–B2O3;low-temperaturesintering;microwavedielectricceramic·?·无机材料学报?卷1引言近年来随着通讯技术的迅猛发展,移动通信设备和便携式终端正趋向小型化、轻量化、集成化、高可靠性和低成本方向发展,这对以微波介质陶瓷为基础的微波电路元器件提出了