钕系中介电常数微波陶瓷的制备及性能研究

发布时间：2018-03-06 13:46

  本文选题：微波陶瓷　切入点：Ca0.61NdxTiO3-MgTiO3　出处：《华北理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着现代通讯技术的快速发展,中介电常数、高Q·f值、近于0的谐振频率温度系数的微波材料研制,成为小型化、轻量化电子元器件制备的关键。采用固相法合成了Ca0.61Ndx Ti O3和Ca0.61Ndx Ti O3-Mg Ti O3陶瓷材料。利用电子显微镜(SEM)、能谱仪(EDS)和X-射线衍射技术(XRD)等分析方法,对材料的显微结构和物相组成进行了分析和表征,通过网络分析仪对材料的介电性能进行了分析。对Ca0.61Ndx Ti O3-Mg Ti O3进行了掺杂改性(复合Zn Al2O4,掺杂La3+、Nb5+),以调节材料的微波性能。结果表明:对于不同Nd含量的Ca0.61Ndx Ti O3材料,随着Nd含量的增加,材料的温度系数降低。当x=0.36时,材料的温度系数最低为104.85ppm/℃。Ca0.61Nd0.36Ti O3与Mg Ti O3复合后,材料的温度系数由104.85ppm/℃降至73ppm/℃,材料的介电性能参数为:εr=45.3,τf=73ppm/℃,Q·f=35000。Ca0.61Ndx Ti O3-Mg Ti O3材料复合掺杂Zn Al2O4,La3+,Nb5+后,在材料的介电常数大于40的前提下,材料的谐振频率温度系数得到了进一步的降低,且材料的品质因数得到了进一步的提高,当Nb5+离子掺杂量为0.01,Zn Al2O4复合量为0.06时得到了性能较好的微波介电陶瓷材料,其介电性能为:εr=41,τf=40ppm/℃,Q·f=38219。优化烧结工艺的研究表明,最佳的升温速率为250℃/h,在最终烧结温度下保温4小时,材料具有良好的综合性能。
[Abstract]:With the rapid development of modern communication technology, microwave materials with intermediate electric constant, high Q 路f value and temperature coefficient of nearly 0 resonant frequency become miniaturized. Ca0.61Ndx TIO 3 and Ca0.61Ndx TIO 3 mg TIO 3 ceramic materials were synthesized by solid phase method. The Ca0.61Ndx TIO 3 and Ca0.61Ndx TIO 3 mg TIO 3 ceramic materials were analyzed by means of electron microscopy (SEM), energy spectrometer (EDS) and X- ray diffraction (XRD). The microstructure and phase composition of the material were analyzed and characterized. The dielectric properties of Ca0.61Ndx TIO _ 3-Mg TIO _ 3 were analyzed by network analyzer. The doping modification of Ca0.61Ndx TIO _ 3-Mg _ 2O _ 3 (composite ZnAl _ 2O _ 4, doped La3 _ Nb5 ~ (5)) was carried out to adjust the microwave properties of the materials. The results showed that: for Ca0.61Ndx TIO _ 3 materials with different ND content, With the increase of ND content, the temperature coefficient of the material decreases. The lowest temperature coefficient of the material is 104.85ppmC 路Ca0.61Nd0.36TiO3, and the temperature coefficient of the material decreases from 104.85ppm / 鈩，

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