US2424995A - Selenium element and method - Google Patents

Selenium element and method Download PDF

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Publication number
US2424995A
US2424995A US464642A US46464242A US2424995A US 2424995 A US2424995 A US 2424995A US 464642 A US464642 A US 464642A US 46464242 A US46464242 A US 46464242A US 2424995 A US2424995 A US 2424995A
Authority
US
United States
Prior art keywords
selenium
aluminum
coating
anodizing
disc
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 - Lifetime
Application number
US464642A
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English (en)
Inventor
Arthur J Miller
Otto J Mueller
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.)
Federal Telephone and Radio Corp
Original Assignee
Federal Telephone and Radio Corp
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
Priority to BE468191D priority Critical patent/BE468191A/xx
Priority to BE468181D priority patent/BE468181A/xx
Application filed by Federal Telephone and Radio Corp filed Critical Federal Telephone and Radio Corp
Priority to US464642A priority patent/US2424995A/en
Priority to GB17893/43A priority patent/GB564981A/en
Application granted granted Critical
Publication of US2424995A publication Critical patent/US2424995A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H01L21/103—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type

Definitions

  • This invention relates to selenium elements and particularly to a method of applying .pressure against a selenium coated plate.
  • the object of the invention is to provide an arrangement whereby a selenium coating can be 3 Claims. (01. 175-386) placed under a pressure without damageto the selenium.
  • mica is expensive and not always easily obtainable in a satisfactory form.
  • an aluminum sheet can satisfactorily be pressed against the selenium if it is provided'with a hydrated oxide coating of a rather critical quality.
  • a hydrated oxide coating of a rather critical quality By the use of such an oxidized aluminum sheet it is possible to bring the sheet into high pressure contact with the selenium for a considerable period of time, such as a number of hours without injuring the selenium.
  • the oxide coating on the aluminum is too thin the selenium is injured or contaminated, apparently by reaction with the surface of the aluminum, and if on the other hand the coating is too thick the selenium tends to adhere to the aluminum more readily than to the base plate with consequent injury to the selenium surface.
  • a coating of the proper thickness and qualityit is possible to apply a heavy pressure against the selenium and to heat treat it at the same time fo a considerable time, if desired, and thus improve the characteristics of the selenium.
  • FIG. 1 is a top view of a pressure device for compressing the selenium coated plate
  • the disc I is a flat sheet which may be circular, preferably of steel and preferably also nickel coated and roughened in .a wellknown manner to receive a coating of selenium 2.
  • the selenium coating may be applied in any wellknown manner such as by placing selenium powder on the disc and then heating the disc to melt the powder and fuse it to the disc.
  • the disc is shown with a centrally located hole 3 which is customarily used in order to build up a selenium element stack on a mandrel. Plates 4 and 5 represent the pressure plates of a press, the rest of the press mechanism not being illustrated.
  • the plate or disc 6 is the aluminum disc which has on it a coating of hydrated aluminum oxide 1 facing the selenium layer 2.
  • a current density of about 16.5 amperes per square root of aluminum surface area to be coated is satisfactory, although we have discovered that this can be varied within fairly wide limits, such as from about 4 to 32 amperes per'square foot; and we allow this current to flow for about seventeen minutes at this rate. While the current density to be used is not very critical so long as it is sufficient for the anodizing, the concentration of the solution in combination ,with the time of anodizing is of importance in determining the quality of the coating. If it is not desired to coat the back of the aluminum disc. the coating on the back may be prevented as by covering the back with a material which will not coat, such as styrene. Fig.
  • thinner oxide coatingsthan those obtained by the above procedure may be round satisfactory enough.
  • the thinner coatings may be obtained by the same anodizing process as described above except that the time of the anodizing in the solution may. be made shorter or the current density may be made less.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Non-Insulated Conductors (AREA)
US464642A 1942-11-05 1942-11-05 Selenium element and method Expired - Lifetime US2424995A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE468191D BE468191A (fi) 1942-11-05
BE468181D BE468181A (fi) 1942-11-05
US464642A US2424995A (en) 1942-11-05 1942-11-05 Selenium element and method
GB17893/43A GB564981A (en) 1942-11-05 1943-10-29 Methods of making selenium elements such as for electric rectifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US464642A US2424995A (en) 1942-11-05 1942-11-05 Selenium element and method

Publications (1)

Publication Number Publication Date
US2424995A true US2424995A (en) 1947-08-05

Family

ID=23844717

Family Applications (1)

Application Number Title Priority Date Filing Date
US464642A Expired - Lifetime US2424995A (en) 1942-11-05 1942-11-05 Selenium element and method

Country Status (3)

Country Link
US (1) US2424995A (fi)
BE (2) BE468181A (fi)
GB (1) GB564981A (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2551048A (en) * 1947-07-19 1951-05-01 Vickers Inc Method of making selenium coated elements
US2567877A (en) * 1947-07-11 1951-09-11 Ment Jack De Electrochemical bonding of aluminum with other materials

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220881A (en) * 1960-11-30 1965-11-30 Gen Telephone & Elect Method of making a non-linear resistor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2203328A (en) * 1938-08-06 1940-06-04 Suddeutsche App Fabrik G M B H Manufacturing selenium valve disks for rectifiers and photoelectric cells
US2221596A (en) * 1938-01-22 1940-11-12 Fides Gmbh Method of manufacturing dry rectifiers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2221596A (en) * 1938-01-22 1940-11-12 Fides Gmbh Method of manufacturing dry rectifiers
US2203328A (en) * 1938-08-06 1940-06-04 Suddeutsche App Fabrik G M B H Manufacturing selenium valve disks for rectifiers and photoelectric cells

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567877A (en) * 1947-07-11 1951-09-11 Ment Jack De Electrochemical bonding of aluminum with other materials
US2551048A (en) * 1947-07-19 1951-05-01 Vickers Inc Method of making selenium coated elements

Also Published As

Publication number Publication date
GB564981A (en) 1944-10-20
BE468181A (fi)
BE468191A (fi)

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