GB966284A - Electrical capacitors - Google Patents

Electrical capacitors

Info

Publication number
GB966284A
GB966284A GB431263A GB431263A GB966284A GB 966284 A GB966284 A GB 966284A GB 431263 A GB431263 A GB 431263A GB 431263 A GB431263 A GB 431263A GB 966284 A GB966284 A GB 966284A
Authority
GB
United Kingdom
Prior art keywords
aluminium
porous
anodic
film
anodizing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB431263A
Inventor
Robert Arthur West
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to GB431263A priority Critical patent/GB966284A/en
Publication of GB966284A publication Critical patent/GB966284A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/022—Electrolytes; Absorbents

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

At least one of the aluminium electrodes of an electrolytic capacitor has a first, dense, anodic oxide layer overlying its surface with a second porous anodic dielectric layer overlying the first and impregnated with a semi-conducting material having a resistivity between 5 x 105 and 3 x 107 ohm/cm. The double coating may be applied to one or more usually both aluminium electrode foils, and is formed by first anodizing the aluminium in a relatively strong acid e.g. oxalic, phosphoric, chromic or sulphuric in which the anodic film is somewhat soluble, so that a porous film is deposited, then anodizing in a weak acid such as boric to build up the dense film underneath the porous one. The Specification lists suitable semi-conducting liquids which may be used for impregnating the porous oxide; these include various polyhydric alcohols, sometimes with acid additives to affect the resistivity characteristics, and it is also possible to use hot polyethylene glycol which solidifies at room temperature. The completed capacitors may be of the wound form using two foils treated as described, or one such electrode may be held as an anode within a container of silver, copper, tantalum, aluminium, lead or other suitable material acting as cathode.
GB431263A 1963-02-01 1963-02-01 Electrical capacitors Expired GB966284A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB431263A GB966284A (en) 1963-02-01 1963-02-01 Electrical capacitors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB431263A GB966284A (en) 1963-02-01 1963-02-01 Electrical capacitors

Publications (1)

Publication Number Publication Date
GB966284A true GB966284A (en) 1964-08-06

Family

ID=9774799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB431263A Expired GB966284A (en) 1963-02-01 1963-02-01 Electrical capacitors

Country Status (1)

Country Link
GB (1) GB966284A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2286724A (en) * 1994-01-26 1995-08-23 Konek S A L Condenser for telephone ringing circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2286724A (en) * 1994-01-26 1995-08-23 Konek S A L Condenser for telephone ringing circuit

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