GB797842A - Improvements in or relating to the manufacture of electric discharge devices - Google Patents
Improvements in or relating to the manufacture of electric discharge devicesInfo
- Publication number
- GB797842A GB797842A GB2298555A GB2298555A GB797842A GB 797842 A GB797842 A GB 797842A GB 2298555 A GB2298555 A GB 2298555A GB 2298555 A GB2298555 A GB 2298555A GB 797842 A GB797842 A GB 797842A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- powdered
- weight
- mixture
- carbonates
- 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
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
797,842. Cathode materials and processing. GENERAL ELECTRIC CO., Ltd. Aug. 2, 1956 [Aug. 9, 1955], No. 22985/55. Class 39(1). In the manufacture of an electric discharge device other than a thermionic valve, the emissive portion of the thermionic cathode is made by mixing together powdered alkaline earth metal carbonates, powdered nickel and/or cobalt, and at least one powdered alloy of nickel and/or cobalt and at least one reducing agent (silicon, magnesium, aluminium, titanium, zirconium or tungsten), pressing the mixture into a compact body and heating the body so as to sinter the powder and decompose the carbonates to produce the corresponding oxides. The carbonates constitute between 10 and 50 per cent by weight of the mixture and include at least 10 per cent by molecular proportion of barium carbonate and the reducing agents are present in such a proportion that there are not less than 2À5 atoms of barium to each atom of the reducing agent. The preferred proportions are about 70 per cent by weight of powdered nickel and/or cobalt, 30 per cent by weight of powdered alkaline earth metal carbonates and about 35 per cent by weight of a powdered nickelsilicon alloy comprising about 30 per cent by weight of silicon. Preferably the compact body is formed by pressing the mixture at a pressure of 80 tons/sq. in. into one end of a metal tube which forms part of the cathode so that a disc of the mixture is formed which is cold welded at its rim to the end of the metal tube. The reduction takes place at a temperature of 1050‹C.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2298555A GB797842A (en) | 1955-08-09 | 1955-08-09 | Improvements in or relating to the manufacture of electric discharge devices |
| FR1155428D FR1155428A (en) | 1955-08-09 | 1956-08-07 | Manufacture of electric discharge devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2298555A GB797842A (en) | 1955-08-09 | 1955-08-09 | Improvements in or relating to the manufacture of electric discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB797842A true GB797842A (en) | 1958-07-09 |
Family
ID=10188233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2298555A Expired GB797842A (en) | 1955-08-09 | 1955-08-09 | Improvements in or relating to the manufacture of electric discharge devices |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1155428A (en) |
| GB (1) | GB797842A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2238655A (en) * | 1989-11-10 | 1991-06-05 | Samsung Electronic Devices | Dispenser cathodes |
| CN114277414A (en) * | 2021-08-05 | 2022-04-05 | 中国海洋大学 | Porous electrode and preparation method thereof |
-
1955
- 1955-08-09 GB GB2298555A patent/GB797842A/en not_active Expired
-
1956
- 1956-08-07 FR FR1155428D patent/FR1155428A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2238655A (en) * | 1989-11-10 | 1991-06-05 | Samsung Electronic Devices | Dispenser cathodes |
| GB2238655B (en) * | 1989-11-10 | 1994-02-02 | Samsung Electronic Devices | Dispenser cathodes |
| CN114277414A (en) * | 2021-08-05 | 2022-04-05 | 中国海洋大学 | Porous electrode and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1155428A (en) | 1958-04-28 |
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