Showing papers on "Tantalum capacitor published in 1983"

Electrolytic capacitor with polymer conductor

Abstract: A solid electrolytic capacitor includes a conductive polymer electrolyte. The electrolyte may comprise p-doped polyacrylonitrile, polypyrrole, or polyacetylene.

Cathode for an electrolytic capacitor

Abstract: A metal container for use as a cathode in a tantalum electrolytic capacitor is drawn from a metal composite which has a layer of tantalum bonded to a copper layer in turn bonded to a nickel layer. The tantalum layer forms the interior of the can and the nickel, the exterior. A layer of tantalum carbide is formed on the tantalum interior and is covered by a layer of finely-divided carbon.

Device for use in making encapsulated chip capacitor assemblies

Abstract: A device for use in making encapsulated chip electrolytic capacitors of precise dimensions having planar surfaces and anode and cathode terminals formed from a metal channel containing the electrolyte capacitor.

Method of manufacturing a moisture sensor

Abstract: A moisture sensor is manufactured by applying a thin layer of tantalum oxide to a moisture insensitive substrate and placing at least two electrodes on the tantalum oxide layer. The tantalum oxide layer comprises the oxide of a highly resistive low density tantalum where the tantalum in the layer applied to the substrate has a density of less than 15 g/cm 3 . The low density tantalum may be applied by cathode sputtering and the oxide may be formed by anodic oxidation.

Capacitor with a heat sink core

Abstract: A capacitor construction for wound foil or electrolytic capacitors having a heat conducting inner can for improving the heat dissipation of the capacitor and for eliminating the need for pitch or epoxy to pot the capacitor roll in an outer can

Process for treating aluminum electrolytic capacitor foil

Abstract: Aluminum electrolytic capacitor foil is treated after etching but before anodizing by first contacting it with a phosphate solution and then heat treating for 30 to 90 seconds to form a thermal oxide layer of controlled thickness. On subsequent anodization, the thermal oxide layer modifies the barrier oxide layer increasing its dielectric strength and hence capacitance and also stabilizes the barrier oxide layer.

Development of a New Al - Ti Alloy Electrolytic Capacitor

Abstract: A solid electrolytic capacitor made of an Al-Ti alloy porous body has been developed. The development of this capacitor is promising because it could be as small as tantalum capacitors and as inexpensive as aluminum capacitors. Its low cost results from the utilization of low-cost materials, while a unique powder metallurgy process results in a high CV product.

Material Considerations for High Frequency, High Power Capacitors

Abstract: The objectives of this program were to develop a capacitor for high frequency, high power operation in the 10 to 40 kHz range at the 75 kVAR power level. The material selection required careful consideration with regard to heat dissipation and thermal stability for reliable service in space at continuous ac voltage. The primary consideration in the selection ion of a capacitor dielectric system normally is given to the solid dielectric material, since the characteristics of the solid determine the performance reliability, and the life of the capacitor. An important property of a solid dielectric is considered to be the dielectric loss, since the frequency of ac operation ion and the space environment direct attention to the thermal properties. The dielectric strength is also a key factor because the life will depend on the durability of the dielectric in regards to deterioration caused by partial discharges in the active volume and at the high-stress edges of the capacitor pad conductors. The temperature coefficient of dissipation factor should indicate self stabilization well below 125°C and the temperature coefficient of capacitance should be negative. An all-film long-life polypropylene capacitor was developed that functioned at the high current density of 125 A rms without supplementary need for cooling while operating in a vacuum atmosphere. The capacitor power density was approximately 24 kVAR/kg when in service at a frequency of 40 kHz. This paper describes the capacitor design and material considerations, for thermal stability and long-life performance reliability.

Electrical capacitor, especially a tantalum electrolytic capacitor

Abstract: In an electrical tantalum electrolytic capacitor, having a tantalum anode (1), a cathode silver layer (4) on the anode (1) and a cup-shaped metal housing (5) into which the tantalum anode (1) which is provided with the cathode silver layer (4) is soldered, in order to permit the use of aluminium for the cup-shaped metal housing (5), an intermediate layer (30) is provided which consists of a metal which can be connected in an electrically and mechanically stable manner to both silver and aluminium.