GB1090935A - Improvements in and relating to methods of manufacturing indirectly heated cathodes and cathodes manufactured by said methods - Google Patents
Improvements in and relating to methods of manufacturing indirectly heated cathodes and cathodes manufactured by said methodsInfo
- Publication number
- GB1090935A GB1090935A GB8403/66A GB840366A GB1090935A GB 1090935 A GB1090935 A GB 1090935A GB 8403/66 A GB8403/66 A GB 8403/66A GB 840366 A GB840366 A GB 840366A GB 1090935 A GB1090935 A GB 1090935A
- Authority
- GB
- United Kingdom
- Prior art keywords
- methods
- cathodes
- foam
- support
- cathode
- 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
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/24—Insulating layer or body located between heater and emissive material
Landscapes
- Solid Thermionic Cathode (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
1,090,935. Thermionic cathode constructions. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Feb. 25, 1966 [March 2, 1965], No. 8403/66. Heading H1D. In a method of making an indirectly heated cathode which has the space between the filament wire 2 and the support 1 for the emissive layer 5 filled out with a porous, insulating, ceramic mass, a ceramic suspension containing gas developing constituents is applied as a thin coating to the filament wire 2 and/or the inner surface of the cathode support 1, the filament is then inserted inside the support and the ceramic suspension caused to foam and expand to fill the intervening space, after which the foam 4 is sintered and degassed. In an example, the suspension was composed of 15 gm. of aluminium powder, 100 gm. of silica (av. particle size 20Á), 650 gm. of aluminium metaphosphate, 100 gm. of bentonite, 3000 gm. of aluminium hydroxide which were mixed together in the dry state and then suspended in 3100 gm. of orthophosphoric acid. The foam was heated in air at 150‹ C. for two hours before being sintered and degassed. The emissive layer may be barium-strontium carbonate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL656502586A NL142817B (en) | 1965-03-02 | 1965-03-02 | METHOD OF MANUFACTURE OF AN INDIRECTLY HEATED CATHODE, AND CATHODE MADE IN ACCORDANCE WITH THIS METHOD. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1090935A true GB1090935A (en) | 1967-11-15 |
Family
ID=19792531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8403/66A Expired GB1090935A (en) | 1965-03-02 | 1966-02-25 | Improvements in and relating to methods of manufacturing indirectly heated cathodes and cathodes manufactured by said methods |
Country Status (9)
| Country | Link |
|---|---|
| AT (1) | AT257749B (en) |
| BE (1) | BE677153A (en) |
| CH (1) | CH442536A (en) |
| DE (1) | DE1564388C3 (en) |
| DK (1) | DK111423B (en) |
| ES (1) | ES323596A1 (en) |
| FR (1) | FR1469999A (en) |
| GB (1) | GB1090935A (en) |
| NL (1) | NL142817B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4881975A (en) * | 1986-12-23 | 1989-11-21 | Albright & Wilson Limited | Products for treating surfaces |
-
1965
- 1965-03-02 NL NL656502586A patent/NL142817B/en not_active IP Right Cessation
-
1966
- 1966-02-24 FR FR50964A patent/FR1469999A/en not_active Expired
- 1966-02-25 GB GB8403/66A patent/GB1090935A/en not_active Expired
- 1966-02-26 DK DK102466AA patent/DK111423B/en unknown
- 1966-02-26 DE DE1564388A patent/DE1564388C3/en not_active Expired
- 1966-02-26 ES ES0323596A patent/ES323596A1/en not_active Expired
- 1966-02-28 BE BE677153D patent/BE677153A/xx unknown
- 1966-02-28 AT AT184966A patent/AT257749B/en active
- 1966-02-28 CH CH282166A patent/CH442536A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE677153A (en) | 1966-08-29 |
| AT257749B (en) | 1967-10-25 |
| NL6502586A (en) | 1966-09-05 |
| DE1564388C3 (en) | 1974-06-20 |
| NL142817B (en) | 1974-07-15 |
| DK111423B (en) | 1968-08-19 |
| DE1564388B2 (en) | 1973-11-22 |
| CH442536A (en) | 1967-08-31 |
| ES323596A1 (en) | 1967-01-16 |
| FR1469999A (en) | 1967-02-17 |
| DE1564388A1 (en) | 1970-03-05 |
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