共查询到20条相似文献,搜索用时 156 毫秒
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掺CaO-B2O3-SiO2玻璃烧结制备MnZn铁氧体及其磁性能 总被引:1,自引:0,他引:1
采用传统陶瓷工艺制备了CaO-B2O3-SiO2(CBS)玻璃掺杂的MnZn铁氧体.研究了CBS玻璃掺入量及烧结温度对MnZn铁氧体的烧结特性及磁性能的影响.结果表明:样品的密度随着CBS掺入量的增加而不断减小,磁性能随着温度的升高而不断增强;掺入适量CBS可在烧结时形成液相,使固体颗粒间产生液相烧结并促进晶粒的长大.... 相似文献
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添加CaO、V2O5对高频MnZn铁氧体性能的影响 总被引:23,自引:0,他引:23
制备了高频MnZn功率铁氧体,研究了添加CaO和V2O5对高频MnZn铁氧体性能的影响.结果表明:对于工作频率高于500 kHz的MnZn功率铁氧体,增加CaO的添加量,可提高晶界电阻率,最大程度地降低涡流损耗;适当添加V2O5会形成液相烧结并使晶粒细化,增加晶界,减少晶粒和晶界内的气孔率,提高晶界电阻率,降低材料的损耗.添加0.3?O和0.1%V2O5(质量分数,下同),可以制备出致密、气孔率低和晶粒均匀(粒径3~5 μm)的高频功率铁氧体材料,其起始磁导率约为1500,磁芯损耗约为130 mW/cm3(500 kHz,50 mT,25℃). 相似文献
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NiZn软磁铁氧体材料应用与市场发展 总被引:4,自引:0,他引:4
一、NiZn软磁铁氧体材料的特性及 生产工艺技术 1、NiZn软磁铁氧体材料的特性 NiZn系软磁铁氧体材料是一类产量大、应用广泛的高频软磁材料。在1MHz以下其性能不如MnZn铁氧体,在1MHz以上,由于它具有多孔性及高电阻率,其性能大大优于MnZn铁氧体,非常适宜在高频中应用。另外,高温时NiO是最稳定的氧化物,故适宜在空气中或氧气中烧结,工艺比MnZn铁氧体简单。 2、NiZn软磁铁氧体材料生产工艺步骤 材料检验→试验→配料→材料混合→一次球磨→脱水→烘干→粉碎→预烧→二次球磨→脱水制 相似文献
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采用传统氧化物工艺制备了NiO-CoO掺杂的MnZn软磁铁氧体材料。研究了NiO、CoO复合掺杂对高Bs低损耗的MnZn铁氧体微结构及电磁性能的影响。结果表明,掺杂0.1%(质量分数)CoO和1.28%(质量分数)NiO的MnZn铁氧体晶粒生长均匀,具有较高的饱和磁感应强度,最低损耗点位于100℃。随着NiO掺杂量的增加,最低功耗点向高温方向移动。CoO掺杂导致材料密度增大,功耗降低。在钟罩炉中按特定烧结曲线烧结MnZn铁氧体具有较好的综合性能:μi=2 198,Pcv=319kW/m3,Bs=540mT(T=25℃),Bs=451mT(T=100℃)。 相似文献
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平炉尘合成MnFe2O4的磁性分析 总被引:2,自引:1,他引:1
包头钢铁厂的平炉尘含铁量高,粒径微细,并以γ-Fe2O3为主。经过提纯分级可以作为生产超细磁性材料的原料。在有二价Mn^2 离子存在及避免氧化的条件下,将平炉尘转化为超细尖晶石型铁酸盐MnFe2O4并对其磁性进行了研究,测定了磁滞回线。 相似文献
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铁氧体-微晶玻璃纳米复合材料的结构与性能 总被引:2,自引:0,他引:2
采用溶胶-凝胶工艺首先合成了NICuZn铁氧体纳米粉末和MgO-Al2O3-SiO2(MAS)凝胶玻璃粉末,将两种粉末按一定比例均匀混合,烧结后得到了由NiCuZn铁氧体和堇青石微晶体两相共存的铁氧体一微晶玻璃纳米复合材料。该材料具有可调控的电磁性能,其起始磁导率高于3、介电常数低于6、截止频率高于2GHz,可望用作持高频多层片式电感介质材料. 相似文献
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用精铁矿粉和Mn3O4制备功率铁氧体工艺特点,结果表明能用廉价的精铁矿粉制出性能接近PC30的功率铁氧体。 相似文献
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A new three-component and magnetically responsive NiFe_2O_4@PANI@Ag nanocomposite has been fabricated by coating of nickel ferrite,NiFe_2O_4,nanoparticles with polyaniline(PANI) and subsequent immobilization of silver nanoparticles onto the surface of polyaniline shell.The as-prepared nanocomposite has been characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),and vibrating sample magnetometer(VSM).The saturation magnetization of the NiFe_2O_4core decreases dramatically after coating with polyaniline and silver nanoparticles,however,the nanocomposite NiFe_2O_4@PANI@Ag can be still separated from solution media through magnetic decantation.The antibacterial activity of the synthesized nanocomposite was studied and compared with those of naked NiFe_2O_4,NiFe_2O_4@PANI and some standard antibacterial drugs. 相似文献
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用精矿粉代替Fe2O3、用Mn3O4代替MnCO3作为原材料,因为减少了Mn离子在反应中的变价机率,提高了配方中Mn离子的准确性,精矿粉的主要成分Fe3O4相变为α-Fe2O3的温度与Mn铁氧体生成温度接近,所以使固相反应更安全,能制备出高性能功率软磁MnZn铁氧体。适量的掺杂CaCO3、V2O5及Bi2O3可以进一步降低样品功耗;制备过程中,采取一些特殊工艺措施及适当烧结温度能进一步提高样品磁性能,使其综合性能基本达到日本TDK的PC30水平。 相似文献
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A. N. Hapishah M. M. Syazwan M. N. Hamidon 《Journal of Materials Science: Materials in Electronics》2018,29(24):20573-20579
In this research work, magnetic and microwave absorption loss and other response characteristics in cobalt zinc ferrite composite has been studied. Cobalt zinc ferrite with the composition of Co0.5Zn0.5Fe2O4 was prepared via high energy ball milling followed by sintering. Phase characteristics of the as-prepared sample by using XRD analysis shows evidently that a high crystalline ferrite has been formed with the assists of thermal energy by sintering at 1250 °C which subsequently changes the magnetic properties of the ferrite. A high magnetic permeability and losses was obtained from ferrite with zinc content. Zn substitution into cobalt ferrite has altered the cation distribution between A and B sites in spinel ferrite which contributed to higher magnetic properties. Specifically, Co0.5Zn0.5Fe2O4 provides electromagnetic wave absorption characteristics. It was found that cobalt zinc ferrite sample is highly potential for microwave absorber which showed the highest reflection loss (RL) value of ??24.5 dB at 8.6 GHz. This material can potentially minimize EMI interferences in the measured frequency range, and was therefore used as fillers in the prepared composite that is applied for microwave absorbing material. 相似文献