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Polymers foil capacitors

Table 1.3 Comparison of the three capacitor types, polymer foil, ceramic and electrolyte capacitor, with some examples of typical applications [263],... Table 1.3 Comparison of the three capacitor types, polymer foil, ceramic and electrolyte capacitor, with some examples of typical applications [263],...
Polymer foil capacitors Ceramic capacitors Electrolyte capacitors ... [Pg.62]

The main commercial use of solid SiO is as a vapor-deposition material for the production of SiOx thin films for optical or electronic applications (antireflective coatings, interference filters, beam-splitters, decorative coatings, dielectric layers, isolation layers, electrodes, thin-film capacitors, thin-film transistors, etc.), for diffusion barrier layers on polymer foils or for surface protection layers.Other uses for SiO have been proposed, such as the substitution of elemental silicon in the Muller-Rochow process for the production of organosilicon halides, because solid SiO can be produced at lower temperatures than elemental silicon. [Pg.242]

Typical Class II materials are ferrodielectric ceramics and polymer electrolytes with high dielectric constants. They are used to develop high capacitance capacitors. For example, metalized polymer foils can achieve a few thousand picofarads to a few microfarads an electrolytic capacitor can offer a capacitance in the range of a few to several thousand microfarads some... [Pg.13]

Dielectric materials vary by cost and the capacitance needed for a specific application. Glass, ceramic, and mica papers are high quality, low capacitance dielectrics with extremely high breakdown resistance. Conversely, metal-ized polymer foils such as polystyrene, polyethylene terephthalate (PET), and Teflon (PTFE) are single-piece dielectric films that offer better capacitor performance. In recent years, polymer foils have come to dominate the static capacitor market because they have better stability at high temperatures, can be manufactured at lower cost, and age better than dielectric papers. [Pg.135]

In 2000, 162000000 kg metallized web material (10-15 billion m2) were used for packaging applications in Europe of these 42% were OPP, 12% PET, and 40% metallized paper. The remaining 6% is accounted for by other metallized films, for example PE, PVC, PA, or cellophane, and metallized boards or tissues. An annual growth rate of 3-4% is forecasted [17, 18]. An approximately equally quantity of metallized film is used for decorative and technical applications. For these, however, PET is the dominant substrate. In technical applications, capacitor foil currently has a large share. RFID and EAS technology and polymer electronics are wide fields of potential applications and future growth for metallized substrates. [Pg.202]

Essentially polymer-film capacitors comprise dielectric films (polymer or paper or both together) interleaved with aluminium electrodes, either as aluminium foil or, more commonly, in the form of a layer evaporated directly on the dielectric, and rolled together. They are sealed in an aluminium can or in epoxy resin. Because the dielectric films and evaporated electrodes have thicknesses of only a few microns and about 0.025 /mi respectively, volumetric efficiencies can be high. The dielectric films are polystyrene, polypropylene, polyester, polycarbonate or paper paper dielectrics are always impregnated with an insulating liquid. [Pg.257]

The anode bodies of tantalum, aluminum, and most recently niobium capacitors are made of highly porous metals. These bodies are obtained either by sintering fine metal powders or electrochemical etching of thin foils. A thin dielectric layer is then electrochemically grown on the metal surface. Due to the porous structure of the anode bodies, the cathode polymer must be able to penetrate deep into the pores and coat aU internal surfaces in order to utilize the full, potential capacitance of the anode. [Pg.410]

Polar polymer dielectric capacitors are miniaturized devices that are widely used in miniaturized circuits in modern electronics. In fabricating polar polymer dielectric capacitors, a physical vapor deposition process is used to coat polycarbonate foil with an A1 layer ( 0.5 pm) to act as the electrode plates. Melted metal is then deposited by an airbrush method on either a cylindrical or flattened roll to provide contacts for the terminal connections. By changing the dielectric thickness, the capacitor s voltage can be changed from 60 to 250 V. [Pg.34]

All production formed capacitors use laminate-like materials. Most typically, the capacitor manufacturer starts with an especially flat copper foil on at least one side. This copper foil is precisely coated with the dielectric material filled polymer. Either the top foil electrode is then laminated or two layers of coated foil are bonded polymer to polymer. [Pg.462]

Fig. 2 Schematic cross section of the ferroelectret foil shown in Fig. 1 left). Ferroelectrets are cellular polymers, with oppositely charged voids. Equivalent circuit representation of the cellular ferroelectret foil (right). The ferroelectret is represented by a current source and by a capacitor. Current is generated when electrical forces are apphed to the ferroelectret. The capacitance of a ferroelectret foil is small, typically around 20 pF for a c acitor with an area of 1 cm ... Fig. 2 Schematic cross section of the ferroelectret foil shown in Fig. 1 left). Ferroelectrets are cellular polymers, with oppositely charged voids. Equivalent circuit representation of the cellular ferroelectret foil (right). The ferroelectret is represented by a current source and by a capacitor. Current is generated when electrical forces are apphed to the ferroelectret. The capacitance of a ferroelectret foil is small, typically around 20 pF for a c acitor with an area of 1 cm ...

See other pages where Polymers foil capacitors is mentioned: [Pg.62]    [Pg.33]    [Pg.105]    [Pg.200]    [Pg.84]    [Pg.470]    [Pg.272]    [Pg.84]    [Pg.64]    [Pg.104]    [Pg.81]    [Pg.1588]    [Pg.459]    [Pg.13]    [Pg.33]    [Pg.166]    [Pg.124]    [Pg.374]    [Pg.172]   
See also in sourсe #XX -- [ Pg.62 ]




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Polymer capacitor

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