GB749390A - Improvements in and relating to the manufacture of electrical contacts - Google Patents

Improvements in and relating to the manufacture of electrical contacts

Info

Publication number
GB749390A
GB749390A GB2369453A GB2369453A GB749390A GB 749390 A GB749390 A GB 749390A GB 2369453 A GB2369453 A GB 2369453A GB 2369453 A GB2369453 A GB 2369453A GB 749390 A GB749390 A GB 749390A
Authority
GB
United Kingdom
Prior art keywords
sintered
powder
grams
extrude
pressed
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
GB2369453A
Inventor
John Henry Drew
Herbert Carmen Brock
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.)
Mallory Metallurgical Products Ltd
Original Assignee
Mallory Metallurgical Products Ltd
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 Mallory Metallurgical Products Ltd filed Critical Mallory Metallurgical Products Ltd
Priority to GB2369453A priority Critical patent/GB749390A/en
Publication of GB749390A publication Critical patent/GB749390A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes

Abstract

749,390. Making electrical contacts. MALLORY METALLURGICAL PRODUCTS, Ltd. Nov. 12, 1954 [Aug. 27, 1953], No. 23694/53. Classes 83 (2) and 83 (4). Powder metallurgy.-In a method of making an electrical contact, a powder compact having a facing layer in which precious metal predominates and a backing layer of a base metal is sintered to form a composite contact piece which is then subjected to a pressing operation to extrude a shank or riveting portion from the backing layer. In a modification a composite sintered strip is formed and the contact pieces are punched from the strip and then pressed to extrude the shank portion. In an example 700 grams precipitated silver powder and 300 grams carbonyl nickel powder were mixed in a porcelain mill for 6 hours and screened through a 60 mesh sieve. To make a single contact piece 0.013 grams of the mixture was placed in a die of 0.182 inch diameter on top of the same weight of electrolytic copper powder of between 100 and 300 mesh. The double layer was then compressed to a density of 7.5 grams/cc. to produce a compact 0.080 inch thick which is sintered at 750‹ C. in cracked ammonia for 15 minutes. Instead of a single compacting step, the powder may be lightly pressed, sintered at 800-900‹ C., repressed and resintered at a temperature below 780‹ C. The sintered contact piece is then pressed to extrude the shank portion. Specification 642,648 is referred to.
GB2369453A 1953-08-27 1953-08-27 Improvements in and relating to the manufacture of electrical contacts Expired GB749390A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2369453A GB749390A (en) 1953-08-27 1953-08-27 Improvements in and relating to the manufacture of electrical contacts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2369453A GB749390A (en) 1953-08-27 1953-08-27 Improvements in and relating to the manufacture of electrical contacts

Publications (1)

Publication Number Publication Date
GB749390A true GB749390A (en) 1956-05-23

Family

ID=10199751

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2369453A Expired GB749390A (en) 1953-08-27 1953-08-27 Improvements in and relating to the manufacture of electrical contacts

Country Status (1)

Country Link
GB (1) GB749390A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226517A (en) * 1961-09-26 1965-12-28 Siemens Ag Electrical contact device
DE2718975A1 (en) * 1977-04-28 1978-11-09 Siemens Ag METHOD FOR PRODUCING A BRIDGE
US4910868A (en) * 1988-02-25 1990-03-27 Merlin Gerin Manufacturing process of an electrical contact with contact pad

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226517A (en) * 1961-09-26 1965-12-28 Siemens Ag Electrical contact device
DE2718975A1 (en) * 1977-04-28 1978-11-09 Siemens Ag METHOD FOR PRODUCING A BRIDGE
FR2389216A1 (en) * 1977-04-28 1978-11-24 Siemens Ag PROCESS FOR MANUFACTURING A BRIDGE CONTACT
US4222167A (en) * 1977-04-28 1980-09-16 Siemens Aktiengesellschaft Method of manufacturing a contact bridge
US4910868A (en) * 1988-02-25 1990-03-27 Merlin Gerin Manufacturing process of an electrical contact with contact pad

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