GB811390A - Impregnated electric current collecting brushes and electric contacts - Google Patents
Impregnated electric current collecting brushes and electric contactsInfo
- Publication number
- GB811390A GB811390A GB2897956A GB2897956A GB811390A GB 811390 A GB811390 A GB 811390A GB 2897956 A GB2897956 A GB 2897956A GB 2897956 A GB2897956 A GB 2897956A GB 811390 A GB811390 A GB 811390A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sintered
- product
- pore
- mixture
- electric
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/12—Manufacture of brushes
Abstract
811,390. Impregnated electric contact brushes. MORGAN CRUCIBLE CO. Ltd. Sept. 21, 1956, No. 28979/56. Class 140. A process for the manufacture of electric current collecting brushes and electric contacts comprises the steps of (i) forming a mixture of powders of graphite and of an electricallyconducting metal and particles of a volatile pore-forming material; (ii) compacting the mixture under pressure; (iii) heat treating the compact to volatilize the pore-forming material and to sinter the porous body; (iv) impregnating the sintered body with an aqueous dispersion of a solid polymerized halogenated ethylene in which all the hydrogen atoms are substituted by halogen; and (v) heating the product to dry and sinter the solid polymerized halogenated ethylene. Specified polymerized halogenated hydrocarbons are polytetrafluoroethylene and polychlorotrifluoroethylene. A suitable metal is copper. Suitable pore-forming materials are urea and ammonium carbonate. The initial mix may be compacted by highpressure in a die or by extrusion. Impregnation of the sintered porous body may be carried out by first subjecting the body to a vacuum to remove air and then impregnating under pressure. In an example, a mixture of copper powder, graphite powder and urea powder is pressed in a mould and then sintered in a reducing atmosphere. The product is vacuumimpregnated with an aqueous dispersion of polytetrafluoroethylene and then dried and sintered. The product may then be re-pressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2897956A GB811390A (en) | 1956-09-21 | 1956-09-21 | Impregnated electric current collecting brushes and electric contacts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2897956A GB811390A (en) | 1956-09-21 | 1956-09-21 | Impregnated electric current collecting brushes and electric contacts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB811390A true GB811390A (en) | 1959-04-02 |
Family
ID=10284307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2897956A Expired GB811390A (en) | 1956-09-21 | 1956-09-21 | Impregnated electric current collecting brushes and electric contacts |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB811390A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ303830B6 (en) * | 1998-12-16 | 2013-05-22 | Victorian Rail Track | Copper-graphite composite material and process for preparing thereof |
-
1956
- 1956-09-21 GB GB2897956A patent/GB811390A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ303830B6 (en) * | 1998-12-16 | 2013-05-22 | Victorian Rail Track | Copper-graphite composite material and process for preparing thereof |
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