DE761371C - Process for the production of a cathodic electrode, in particular for electrolytic capacitors - Google Patents
Process for the production of a cathodic electrode, in particular for electrolytic capacitorsInfo
- Publication number
- DE761371C DE761371C DES147746D DES0147746D DE761371C DE 761371 C DE761371 C DE 761371C DE S147746 D DES147746 D DE S147746D DE S0147746 D DES0147746 D DE S0147746D DE 761371 C DE761371 C DE 761371C
- Authority
- DE
- Germany
- Prior art keywords
- electrolytic capacitors
- production
- cathodic electrode
- cathodic
- cathode
- 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
Links
- 239000003990 capacitor Substances 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000000034 method Methods 0.000 title claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 239000011049 pearl Substances 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/0425—Electrodes or formation of dielectric layers thereon characterised by the material specially adapted for cathode
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Description
Verfahren zur Herstellung einer kathodischen Elektrode, insbesondere für elektrolytische Kondensatoren Es ist eine bekannte Erscheinung, daß die Kapazität von elektrolytischen Kondensatoren durch häufiges Ein- und Ausschalten des Rundfunkgerätes, in welchem der elektroh-tische Kondensator z. D. verwendet wird, absinkt. Diese Kapazitätsverminderung, welche bis zu 5o% betragen kann, ist darauf' zurückzuführen, daß beim Ausschalten die auf der Anode befindliche Ladung auf die Kathode überfließt und hier eine Oxydation der vorzugsweise aus Aluminium bestehenden kathodischen Belegung hervorruft. Man sagt, daß solche Kondensatoren keine genügende Schaltfestigkeitaufweisen. Man hat bereit; N.crsticht, diese Oxvdation dadurch zu vermeiden, d. h. also die Schaltfestigkeit zu erhöhen, daß man das Kathodenmaterial mindestens teilweise nicht aus einem Ventilmetall, sondern aus einem anderen -Metall wie Kupfer, Zinn oder Chrom herstellt. Es hat sich aber gezeigt, da1J durch solche Fremdmetalle im Zusammenhang mit dem Elektrolyt leicht Korrosionen, insbesondere der anodischen Belegung hervorgerufen werden, die den Kondensator in seiner Lebensdauer ungünstig beeinträchtigen. Eine weitere llöglichl:cit in der Vermeidung eine: Kapazitätsverlustes durch Umladungen beim Ausschalte» der elektrolytischen Kondensatoren besteht darin. daß man die Kathode in gleicher "'eise wie die Anode formiert, d. h. mit einer vorzugsweise auseinemUmsetzungsprodukt des Katliodeninaterials bestehenden Sperrschicht überzieht. Dadurch trittbekanntlich ein großer Verlust an spezifischer Kapazität ein. so daß diese. Verfahren als unwirtschaftlich bezeichnet werden muß.Process for the production of a cathodic electrode, in particular for electrolytic capacitors. D. is used, drops. This reduction in capacity, which can be up to 50%, is due to the fact that when switching off the charge on the anode overflows onto the cathode and causes oxidation of the cathodic coating, which is preferably made of aluminum. Such capacitors are said to have insufficient switching strength. One has ready; It is important to avoid this oxidation, i.e. to increase the switching resistance, by making the cathode material at least partially not from a valve metal, but from another metal such as copper, tin or chromium. It has been shown, however, that such foreign metals in connection with the electrolyte easily cause corrosion, especially of the anodic coating, which adversely affects the life of the capacitor. Another, perhaps, one way of avoiding a loss of capacity due to charge reversal when switching off the electrolytic capacitors consists in this. that the cathode is formed in the same way as the anode, ie coated with a barrier layer preferably consisting of a reaction product of the cathode material. As is known, this results in a great loss of specific capacity, so that this process must be described as uneconomical.
Die vorliegende Erfindung bezieht sich nun auf ein '"erfahren zur Herstellung einer kathodischen Elektrode, insbesondere für elektrolytische Kondensatoren, und bezweckt, die angeführten Übelstände zu vermeiden.The present invention now relates to an '"experience for the Manufacture of a cathodic electrode, especially for electrolytic capacitors, and aims to avoid the evils mentioned.
Gemäß der Erfindung wird dies dadurch erreicht. daß die auf der vorzugsweise aus Aluniinium bestehenden katliodischen Belegung hetindliche natürliche OZvdscliicht einer ;@ürmeliehandlung, z. B. hei etwa 3oo bis tiooJ C. unterworfen wird.According to the invention this is achieved thereby. that the on the preferably catliodic occupancy consisting of aluminum one; @ ürmeliehandlung, z. B. hei about 3oo to tiooJ C. is subjected.
Durch diese Wärmebehandlung wird das natürliche Aluminiunioxvd in eine andere 'Modifikation übergeführt. Es hat sich gezeigt. ilaß diese andere 'foditilcation die Eigenschaft hat. eine Fürmierung der Kathode, d. h. die Bildung einer Sperrschicht wesentlich zu erschweren. Da die entstandene 'Modifikation des natürlichen Aluminiumoxyds nur sehr schwer zwecks Bildung einer dielektri#chen Sperrschicht Sauerstoff aufnimmt, .o kann dieser Sauerstoff bei seinem Entstehen aus dem Elektrolvt heraustreten. bevor er also in die umgewandelte natürliche Oxydschicht eintritt. Es ist in diesen Fällen zu beobachten. daß der Sauerstoff in Form von Gasblasen aus dem Elektrolyt herausperlt. Eine für die Gesamtkapazität des Kondensators schädliche Oxydation der kathodischen Belegung wird also vermieden.This heat treatment turns the natural aluminum oxide into another 'modification transferred. It has shown. Let this other 'foditilcation has the property. a coating of the cathode, d. H. the formation of a barrier layer to make it much more difficult. Because the resulting 'modification of natural aluminum oxide absorbs oxygen only with great difficulty in order to form a dielectric barrier layer, .o this oxygen can escape from the electrolvt when it is formed. so before it enters the transformed natural oxide layer. It's in these Watch cases. that the oxygen in the form of gas bubbles from the electrolyte pearls out. Oxidation harmful to the total capacity of the capacitor the cathodic occupancy is thus avoided.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES147746D DE761371C (en) | 1941-11-20 | 1941-11-20 | Process for the production of a cathodic electrode, in particular for electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES147746D DE761371C (en) | 1941-11-20 | 1941-11-20 | Process for the production of a cathodic electrode, in particular for electrolytic capacitors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE761371C true DE761371C (en) | 1954-04-29 |
Family
ID=7542498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES147746D Expired DE761371C (en) | 1941-11-20 | 1941-11-20 | Process for the production of a cathodic electrode, in particular for electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE761371C (en) |
-
1941
- 1941-11-20 DE DES147746D patent/DE761371C/en not_active Expired
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