新型多纤维陶瓷电容器的设计

提出了一种新型多纤维陶瓷电容器(MFC)。MFC由众多纤维电容器并联而成，而每根纤维电容器由内电极(导电纤维)、介电层和外电极构成。理论分析表明，当纤维直径与介电层厚度相匹配时，MFC的电容比多层电容器(MLC)的电容大，而且MFC也具有更优异的抗击穿性能。     

多层片式陶瓷电容器MLC研发进展

介绍了多层陶瓷电容器MLC产品的国内外生产与研发状况，尤其是国外先进厂家的湿法印刷技术与Soufill陶瓷介质膜制造工艺，讨论当前常压MLC的发展趋势和高压MLC的技术水平，指出我国MLC行业存在的问题和发展方向。     

Refinement on the theoretical analysis of multifiber ceramic capacitor

In a previous paper, a new type of ceramic capacitor, multifiber ceramic capacitor (MFC), was designed and analyzed to compare the properties with multilayer ceramic capacitors (MLC). Refinement on the theoretical analysis of the MFC is presented in this paper for the capacitors made from dielectric film less than 2 m thick. A critical _c exists above which the specific capacitance of an MFC is higher than an MLC, where is the ratio of the dielectric thickness of the MLC and the MFC. Such a _c value is readily attainable because a high-quality dielectric coating on fiber substrates can be easily produced by modern thin-film technology. In other words, MFC has the potential to surpass MLC in term of the specific capacitance. Core fibers (inner electrodes) with a small diameter should be selected, whenever possible, for improved specific capacitance. The choice of possible materials for the MFC is also discussed.     

Multilayer ceramic capacitor electrdes: powder technology and fired properties

The properties of Pd/Ag thick-film multilayer ceramic capacitor (MLC) electrode pastes are directly related to the characteristics of the metal powders. Better performance is obtained when deagglomerated powders are used. Improvements in precious metal powder technology has produced electrodes that permit a 30% reduction in precious metal consumption with superior functional and cosmetic properties. Use of deagglomerated powders also enables manufacture of MLC electrode pastes which print smooth enough so as to be compatible with wet stack process, where the surface roughness of the dried electrode is a primary concern.     

Optimization of multi-layer ceramic capacitor geometry for maximum yield during binder burnout

The yield during binder burnout of barium titanate multi-layer ceramic capacitors with poly(vinyl) butyral as a binder and platinum as the electrode material depends on the side length and height of the devices. In general, the yield decreases with increasing volume of the capacitor and depends on the aspect ratio of the component. For capacitors of square parallelepiped geometry, the optimum aspect ratio determined from the analysis of binder burnout yield data occurs at a height-to-length ratio of approximately 1 : 3. A methodology is presented which describes how to use the yield data obtained from binder burnout experiments to guide the optimum design of capacitor geometry. Analytical expressions were developed for capacitors of cube, square parallelepiped, rectangular parallelepiped, circular cylinder, and elliptical cylinder geometry. As the dependence of the yield on the dimensions becomes more complex, the optimum shape of the capacitor becomes more asymmetric.     

TA2工业纯Ti微弧氧化陶瓷膜生长规律及电容效应

对TA2工业纯Ti微弧氧化陶瓷膜的生长规律进行了实验研究,分析了陶瓷膜表面形貌、厚度、相结构等不同生长阶段的实验现象及结果。模拟微弧氧化工艺反应过程,运用多种理论建立并分析了氧化陶瓷膜生长模型及等效电路。模型及电路分析结果证明,陶瓷膜在形成时呈现先离散分布后连接成片的生长特点,成膜后TiO2陶瓷膜具有交流耦合电容效应。模型及等效电路分析与实验结果是吻合的,为改善TA2工业纯Ti微弧氧化工艺并提高陶瓷膜性能提供了实验与理论基础。     

Mechanochemical Adhesion and Plasticity in Multifiber Hydrogel Networks

The extracellular matrix (ECM) has force-responsive (i.e., mechanochemical) properties that enable adaptation to mechanical loading through changes in fibrous network structure and interfiber bonding. Imparting such properties into synthetic fibrous materials will allow reinforcement under mechanical load, the potential for material self-adhesion, and the general mimicking of ECM. Multifiber hydrogel networks are developed through the electrospinning of multiple fibrous hydrogel populations, where fibers contain complementary chemical moieties (e.g., aldehyde and hydrazide groups) that form covalent bonds within minutes when brought into contact under mechanical load. These fiber interactions lead to microscale anisotropy, as well as increased material stiffness and plastic deformation. Macroscale structures (e.g., tubes and layered scaffolds) are fabricated from these materials through interfiber bonding and adhesion when placed into contact while maintaining a microscale fibrous architecture. The design principles for engineering plasticity described can be applied to numerous material systems to introduce unique properties, from textiles to biomedical applications.     

ZnTiO3-based ceramics sintered at low temperature with boron addition for multilayer ceramic capacitor applications

Mixture of zinc metatitanate and rutile (ZnTiO₃ + 0.2TiO₂), had been prepared via the conventional solid-state reaction method. The sintering behavior and microwave dielectric properties of ZnO–TiO₂ system were investigated. The composition and microstructure of ceramics were discussed with XRD and SEM. It was found that ZnO–TiO₂ ceramics, which was sintered at 900°C using 1.0 wt% B₂O₃ as sintering additive, had homogeneously fine microstructures and high densification. Samples possessed excellent microwave dielectric properties: ε _r = 26, Q × f = 34,890 GHz, and τ _f = ?11 ppm/°C. The above- mentioned material was suitable for the tape casting process and compatible with Ag electrodes, therefore, was an excellent candidate for multilayer ceramic capacitor applications.     

Modified vacuum capacitor

The paper presents a brief account of the behaviour of a new type of vacuum capacitor, in which the conventional plate is replaced by a conducting film. It consists of two aluminized concentric glass tubes, outer one internally and inner one externally sealed off at both ends. Construction details, rating characteristics, effect of humidity and temperature changes are discussed. The fabricated experimental capacitors of value 50 pF were found to withstand 1 kV, above which vacuum breaks down as predicted by clump theory. The advantages and disadvantages of this capacitor over conventional vacuum capacitors are discussed.     

The preparation of copper fine particle paste and its application as the inner electrode material of a multilayered ceramic capacitor

Well size-controlled copper fine particles (diameter: 100-300?nm) were used as the inner electrode material of multilayered ceramic capacitors (MLCCs). The particles were dispersed in terpineol to form a printing paste with 50?wt% copper particles. The MLCC precursor modules prepared by the layer-by-layer printing of copper and BaTiO(3) particles were cosintered. Detailed observation of the particles, paste, and MLCCs before and after sintering was carried out by electron microscopy. The sintering temperature of Cu-MLCC was as low as 960?°C. The permittivity of these MLCCs was successfully measured with the copper inner layers.     

纳米门炭及纳米门电容器

纳米门电容器是目前报道中比能量最高的超级电容器,其关键在于采用结构独特的纳米门炭作为电极材料.纳米门炭具有较小的比表面积（100 m^2/g左右）,比较大的密度,孔结构分布在中孔和大孔;最大的特点是具有生长比较完整的类石墨微晶 .纳米门的含义是：组成碳的石墨微晶中d002层间距在0.365 nm～0.385 nm之间,其结构具有类似＂门＂或层间入口的作用,且其大小在纳米范围内,所以称为纳米门.纳米门电容器在充电过程中电解液离子和溶剂分子可以进入纳米门炭层间,增大其比表面积和比电容,进而得到高的比能量.     

Relaxor ferroelectric (Bi0.5Na0.5)TiO3-based ceramic with remarkable comprehensive energy storage performance under low electric field for capacitor applications

Journal of Materials Science: Materials in Electronics - Although high-applied electric field can usually generate high energy storage performance (ESP) for most dielectric materials, the presence...     

Thin film ferroelectrics for capacitor applications

Pulsed laser deposition (PLD) has been used to fabricate simple thin film capacitor structures with a variety of ferroelectric materials. Thin film capacitors using the conventional ferroelectric material BaxSr1-xTiO3(BSTO) have been made across the entire compositional series. Electrical characterization shows that in thin film form these ferroelectrics display Curie point behaviour which is largely independent of composition. This contrasts sharply with bulk behaviour. The thin film fabrication and characterization of relaxor ferroelectric ceramics, such as Pb(Mg1/3Nb2/3)O3 (PMN) and Pb(Zn1/3Nb2/3)O3-BaTiO3(PZN-BT), is also reported. © 1998 Chapman & Hall     

Relaxor ceramics for multilayer capacitor application

Relaxor ferroelectrics, lead magnesium niobate (PMN) and lead zinc niobate (PZN) and their solid solution with lead titanate (PT) and barium titanate (BT) were studied. Unlike lead magnesium niobate, the pyrochlore-free material for lead zinc niobate could not be prepared by reaction between lead niobate and ZnO below 1000°C. However, some improved composition was obtained when lead zinc niobate (85%) and a mixture of lead titanate (10%) and barium titanate (5%) sintered at 950°C. XRD examination of the samples revealed that lead magnesium niobate prepared by us contained 9.9% pyrochlore phase, whereas the solid solution between 90% lead magnesium niobate and 10% lead titanate was completely free from the same phase. The dielectric constant for PZN-PT-BT (85:10:5) ternary system was 4000, whereas the same for lead magnesium niobate and its solid solution with 10% lead titanate was 4100 and 6000 respectively. The comparatively low value obtained for PZN-PT-BT solid solution was probably due to the presence of appreciable amount of pyrochlore phase. The grain diameter for PMN and PMN-PT (90:10) solid solution was 1.37/μM and 2.34μM respectively.     

滤波电容的选择和使用

介绍在电磁兼容测试当中，当连续干扰电压测试结果不满足相应标准时，采取相应的滤波电容抑制干扰的方法。     

纳米陶瓷、复相陶瓷及纳米复相陶瓷

纳米陶瓷、复相陶瓷及纳米复相陶瓷的研究是纳米材料研究领域中的一个重要部分，综述了其发展过程和研究动态，阐述了纳米复相陶瓷的优异性能、产生机理及应用前景，展望了纳米复相陶瓷的发展趋势．     

Stable cryogenic vacuum capacitor for single-electron chargingexperiments

For use in our single-electron charging experiment, a novel cryogenic vacuum capacitor has been developed which is superior to the previous parallel-plate design. Due to its coaxial design consisting of a long cylindrical center electrode and a shorter cylindrical ring electrode, it is inherently stable against mechanical vibrations and thermal cycling. Electrical insulation is achieved by the exclusive use of sapphire, which promises extremely low leakage currents