GB589774A - Improvements in or relating to composite metal articles and methods of making the same - Google Patents
Improvements in or relating to composite metal articles and methods of making the sameInfo
- Publication number
- GB589774A GB589774A GB8281/45A GB828145A GB589774A GB 589774 A GB589774 A GB 589774A GB 8281/45 A GB8281/45 A GB 8281/45A GB 828145 A GB828145 A GB 828145A GB 589774 A GB589774 A GB 589774A
- Authority
- GB
- United Kingdom
- Prior art keywords
- discs
- per cent
- composite metal
- making
- electrodes
- 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
- 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
- H01H11/041—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
- H01H11/045—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion with the help of an intermediate layer
Abstract
To avoid distortion &c. during manufacture, composite metal articles such as electric contacts, spark-gap electrodes, X-ray targets, sparking-plug electrodes, welding electrodes &c. consist of facings wholly or mainly of tungsten, brazed or welded to a backing member having similar expansion characteristics and consisting of 60 to 95 per cent. tungsten, 2.5 to 20 per cent. nickel and the remainder of copper and/or molybdenum; either of the last two ingredients being replaceable wholly or in part by gold. Up to 1 per cent. of cobalt, manganese and iron may also be added. In making the backing, the particles are ball milled for about 48 hours, mixed with a resin binder, screened through a 90 mesh sieve, pressed into discs large enough to allow for about 20 per cent. shrinkage, and heated to a temperature sufficient to volatilize the binder. The discs are then pushed further into the furnace for heating to the sintering temperature of 1,000 DEG C. for about 20 minutes. During heating the discs are placed on an alundum slab in a carbon boat with alundum sand between the discs and the slab to facilitate movement due to shrinkage during sintering.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US589774XA | 1944-04-04 | 1944-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB589774A true GB589774A (en) | 1947-06-30 |
Family
ID=22020061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8281/45A Expired GB589774A (en) | 1944-04-04 | 1945-04-04 | Improvements in or relating to composite metal articles and methods of making the same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB589774A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2999309A (en) * | 1955-04-06 | 1961-09-12 | Welded Carbide Tool Company In | Composite metal article and method of producing |
| GB2154800A (en) * | 1984-02-17 | 1985-09-11 | Mitsubishi Electric Corp | Contact for a vacuum circuit breaker |
-
1945
- 1945-04-04 GB GB8281/45A patent/GB589774A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2999309A (en) * | 1955-04-06 | 1961-09-12 | Welded Carbide Tool Company In | Composite metal article and method of producing |
| GB2154800A (en) * | 1984-02-17 | 1985-09-11 | Mitsubishi Electric Corp | Contact for a vacuum circuit breaker |
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