GB402893A - Improvements in electrical make-and-break contacts and method of making same - Google Patents

Improvements in electrical make-and-break contacts and method of making same

Info

Publication number
GB402893A
GB402893A GB2294032A GB2294032A GB402893A GB 402893 A GB402893 A GB 402893A GB 2294032 A GB2294032 A GB 2294032A GB 2294032 A GB2294032 A GB 2294032A GB 402893 A GB402893 A GB 402893A
Authority
GB
United Kingdom
Prior art keywords
single crystal
granules
hydrogen
tungsten
air
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
GB2294032A
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.)
Duracell Inc USA
Original Assignee
PR Mallory and Co Inc
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 FR742269D priority Critical patent/FR742269A/fr
Priority to FR742270D priority patent/FR742270A/fr
Priority to US551671A priority patent/US1958338A/en
Application filed by PR Mallory and Co Inc filed Critical PR Mallory and Co Inc
Priority to GB2294132A priority patent/GB402894A/en
Priority to GB2294032A priority patent/GB402893A/en
Publication of GB402893A publication Critical patent/GB402893A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

In the manufacture of metallic make-and-break contacts made of tungsten and adapted for ignition systems in motor vehicles, the material is treated so as to increase the size of the surface granules or to reduce the amount of amorphous material between the granules, a single crystal or large granule in the limit, being employed as the contact. Such single crystal contacts may be obtained by crystal growth around a single crystal wire so as to form a slug or bar which is cut into individual contact points, the latter being finally mounted on a suitable support, e.g. by copper-brazing in hydrogen. According to one method of reducing the number of granules per unit area a rod or sheet of wrought tungsten is maintained, by electrical heating, under non-oxidizing conditions, e.g. in vacuo or in an atmosphere of hydrogen, helium, or argon, at a temperature slightly less than its melting-point for a short period of time and, before exposure to the air, is allowed to cool rapidly to a temperature at which serious oxidation on exposure to the air will not occur.
GB2294032A 1931-07-18 1932-08-16 Improvements in electrical make-and-break contacts and method of making same Expired GB402893A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR742269D FR742269A (en) 1932-08-16
FR742270D FR742270A (en) 1932-08-16
US551671A US1958338A (en) 1931-07-18 1931-07-18 Electrical make-and-break contact
GB2294132A GB402894A (en) 1932-08-16 1932-08-16 Improvements in electrical make-and-break contacts and method of making same
GB2294032A GB402893A (en) 1932-08-16 1932-08-16 Improvements in electrical make-and-break contacts and method of making same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2294032A GB402893A (en) 1932-08-16 1932-08-16 Improvements in electrical make-and-break contacts and method of making same

Publications (1)

Publication Number Publication Date
GB402893A true GB402893A (en) 1933-12-14

Family

ID=10187517

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2294032A Expired GB402893A (en) 1931-07-18 1932-08-16 Improvements in electrical make-and-break contacts and method of making same
GB2294132A Expired GB402894A (en) 1932-08-16 1932-08-16 Improvements in electrical make-and-break contacts and method of making same

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB2294132A Expired GB402894A (en) 1932-08-16 1932-08-16 Improvements in electrical make-and-break contacts and method of making same

Country Status (2)

Country Link
FR (2) FR742270A (en)
GB (2) GB402893A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658680A (en) * 1968-09-04 1972-04-25 Thomson Csf Apparatus for forming silicon carbide filaments

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658680A (en) * 1968-09-04 1972-04-25 Thomson Csf Apparatus for forming silicon carbide filaments

Also Published As

Publication number Publication date
GB402894A (en) 1933-12-14
FR742270A (en) 1933-03-03
FR742269A (en) 1933-03-03

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