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复合添加对锂铁氧体烧结特性和电磁性能的影响 总被引:2,自引:1,他引:1
用传统的陶瓷工艺制备Li铁氧体材料.研究了复合添加Bi2O3等多种添加剂的作用.结果表明,添加适量超细球状Bi2O3粉可有效抑制Li的挥发,同时引入Zn2 、Ti4 、Mg2 、Mn2 等金属离子可将锂铁氧体的烧结温度降低至900℃以下,从而实现与银内电极的低温共烧.测试分析表明复合添加上述金属离子的锂铁氧体材料性能显著提高.起始磁导率μi =35~250,温度系数αμ(10kHz)5~7×10-6/℃,截止频率fc=12~86MHz,电阻率ρ>109Ω·m,居里温度TC>100℃. 相似文献
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首先用sol-gel法制得Pb_(0.95)Sr_(0.05)(Zr_(0.52)Ti_(0.48))O_3(PZT)纳米粉料,然后采用固相反应法制备NiCuZn/PZT铁氧体/陶瓷复合材料,研究了P_2O_5-Co_2O_3-Bi_2O_3组合掺杂对复合材料性能的影响.结果表明,当固定质量分数w(Bi_2O_3)=2.5 %,w(P_2O_5)=0.5 %,适量的Co_2O_3掺杂可同时提高复合材料品质因数Q、起始磁导率和介电常数,并降低材料的介电损耗.当w(Co_2O_3)=0.3%时,材料的综合电磁性能最佳.所制备的材料满足叠层片式电容器和电感器件的性能要求,有望成为用于叠片式滤波器的电感、电容复合双性材料. 相似文献
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Nd2O3掺杂对NiZn铁氧体电磁性能的影响 总被引:1,自引:0,他引:1
研究了Ni0.4Zn0.6NdxFe2-xO4铁氧体的电磁性能,从材料的微观结构出发,着重讨论了Nd^3+离子对NiZn铁氧体起始磁导率μ,品质因素Q,截止频率fc电阻率ρ以及居里温度TC的影响。 相似文献
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聚合物基电磁屏蔽复合材料 总被引:16,自引:0,他引:16
介绍了电磁干扰的危害及电磁屏蔽的基本原理,着重论述了聚合物基电磁屏蔽复合材料的研制技术和开发现状,并探讨了导电填料、聚合物基体及复合工艺等因素对这类复合材料屏蔽效能的影响。 相似文献
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(NixZn0.825—xCu0.170Co0.005)Fe1.90O3.85铁氧体的电磁性能 总被引:1,自引:0,他引:1
采用配方式(NixZn0.825-xCu0.170Co0.005)Fe1.90O3.85(简称NiCuZn铁氧体)在较宽的组成范围内(x=0.295~0.750)研究了NiCuZn铁氧体的电磁性能,发现NiCuZn铁氧体的μ,Q以及温度特性随Ni含量x的变化与NiZn铁氧体有很大不同,并对产生这种现象的原因进行了初步探讨。 相似文献
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锂硫电池具有理论比容量高(1 675 mA·h/g)、硫资源丰富、环境友好无毒和价格低廉等优点,是下一代二次电池的研究重点。单质硫作为锂硫电池正极材料时,其导电性差、中间产物溶解及放电过程体积膨胀导致的电化学性能衰减,严重制约着锂硫电池的商品化。对单质硫进行复合是目前主要的改性方法和研究热点。综述了吸附型、包覆型和多元复合型等多种硫基正极复合材料的研究现状,分析了复合材料微观结构对其电化学性能的影响,并展望了硫基正极复合材料及锂硫电池的发展前景。 相似文献
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Electromagnetic responses of cement–PZT composites under impact loading have been presented in this work. The values of density, dielectric constant and EMR voltage increase while that of porosity and loss tangent decrease with increase in PZT content. Filler (PZT) concentration dependent dielectric constant as well as loss tangent data shows exponential variation. The emitted EMR voltage as well as average EMR energy release rate for 21?cm height of impact increase from 1.03 V to 2.24 V and 0.10092 V2-sec/sec to 0.4635 V2-sec/sec respectively with the increasing PZT content (5% to 40%). The EMR responses of the composites were also found to be proportional to the height of impact in all the composites tested, indicating that the measurement of EMR responses from the cement based composites may be useful for deformation monitoring. 相似文献
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采用注塑工艺压制生坯,在氮气气氛下、以不同温度(800?1300℃)烧结制备铁硅铬环形磁芯。测试了磁环的电磁性能、频谱特性和XRD谱,观察了磁环表面和截面的SEM形貌等。系统研究了烧结温度对密度、磁导率、频谱特性、物相、显微结构等的影响。结果表明,在900℃以下烧结,密度、显微结构和电磁性能没变。在1000℃烧结温度下,电磁性能最佳。1000℃以上烧结,密度升高,但是磁环内部出现另相和晶粒异常长大,导致电磁性能急剧下降。由于1000℃的烧结条件下,铁硅铬磁环有最佳低频电磁性能,为正在注塑研发铁硅铬相关产品提供指导。 相似文献
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对(1-x)(Ni0.4Zn0.6)Fe2O4+x(Ni0.8Zn0.2)O铁氧体的X射线衍射、体积密度、直流体电阻率、磁导率温度谱和频率谱等测试数据进行比较分析发现:当x≤0.05时,铁氧体为单纯的尖晶石相,尖晶石晶格中少量氧缺位存在有利于促进晶粒的生长,提高铁氧体初始磁导率和致密度;当x>0.05时,铁氧体为尖晶石和石盐石两相复合体,非磁性石盐石相(NiyZn1-y)O(y<0.8)在晶界处的存在极大地减缓了晶粒的生长速度,促进了晶粒细化,改善了铁氧体的高频电磁特性和温度稳定性. 相似文献
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In this investigation, PZT films were sputter-deposited on Si/SiO2/Ti/Pt substrates using a dual-target system. The dual targets Pb/PZT(PbZr0.54Ti0.46O3) and PbO/PZT(PbZr0.54Ti0.46O3) were used to reveal the effects of various lead compensation source materials on the microstructure and ferroelectric properties of the films. The structures of the films were characterized by X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM). The chemical binding state was determined using X-ray photoelectron spectrometry (XPS). Ferroelectric polarizability was measured using a Radiant Technology RT66A tester. The influence of deposition temperatures on the microstructure and ferroelectric properties of the films was studied. Perovskite PZT films were successfully deposited using the Pb/PZT and the PbO/PZT dual target sputtering systems at a substrate temperature of between 500 and 580C. Structural change was elucidated as a function of deposition temperatures and the lead sources were correlated with the ferroelectric properties of the film. The ferroelectric characteristics of the PZT films deposited using the PbO/PZT dual target were better than those of films deposited using the Pb/PZT dual target, because the former films had a higher bonding energy. 相似文献
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简要介绍了高频低功耗功率铁氧体TP4材料的研制和生产过程,对TP4材料制在的铁氧体磁芯有关电磁性能及显微结构作了详细研究 。 相似文献