GB757272A - Improvements relating to dispenser cathodes - Google Patents
Improvements relating to dispenser cathodesInfo
- Publication number
- GB757272A GB757272A GB23248/54A GB2324854A GB757272A GB 757272 A GB757272 A GB 757272A GB 23248/54 A GB23248/54 A GB 23248/54A GB 2324854 A GB2324854 A GB 2324854A GB 757272 A GB757272 A GB 757272A
- Authority
- GB
- United Kingdom
- Prior art keywords
- holder
- closure
- recess
- metal powder
- sintered
- 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
- H01J1/28—Dispenser-type cathodes, e.g. L-cathode
-
- 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)
- Solid Thermionic Cathode (AREA)
- Powder Metallurgy (AREA)
Abstract
757,272. Thermionic cathode constructions. GENERAL ELECTRIC CO. Aug. 10, 1954 [Sept. 24, 1953], No. 23248/54. Class 39 (1). [Also in Group V] In a dispenser cathode, in which emissive material 11 is contained in a recess in a holder 5, which recess is closed by a porous sintered wall 10 of refractory metal powder, the holder itself is also of sintered metal powder, but impervious. The H-section holder 5, and closure 10, are pressed separately, and then sintered together after assembly, preferably in vacuum or a hydrogen atmosphere. The metal powder for forming the holder is of smaller grain size than that for the closure, is compacted more firmly, and sinters at a lower temperature, so that after firing, the holder is impervious, while the closure remains porous, and is frangible enough to be machined to size without filling up the pores. Molybdenum for the holder, and tungsten for the closure, are preferred materials The holder is pressed in a mould, Fig. 1 (not shown), the upper recess being tapered; the closure is similarly tapered, so that it fits exactly and flush. In the modification of Fig. 4 (not shown) the closure takes the form of filling the whole recess with the tungsten powder.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US382085A US2830218A (en) | 1953-09-24 | 1953-09-24 | Dispenser cathodes and methods of making them |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB757272A true GB757272A (en) | 1956-09-19 |
Family
ID=23507463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23248/54A Expired GB757272A (en) | 1953-09-24 | 1954-08-10 | Improvements relating to dispenser cathodes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2830218A (en) |
| FR (1) | FR1112390A (en) |
| GB (1) | GB757272A (en) |
| NL (1) | NL96853C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE564257A (en) * | 1957-01-26 | |||
| US2945150A (en) * | 1958-12-11 | 1960-07-12 | Gen Electric | Thermionic cathodes and methods of making |
| US3045320A (en) * | 1959-03-12 | 1962-07-24 | Raytheon Co | Impregnated cathodes |
| DE1112209B (en) * | 1959-03-20 | 1961-08-03 | Siemens Ag | Indirectly heated cathode with a disc-shaped emission surface and a holder made of seamless foil-tube |
| US3323916A (en) * | 1964-10-23 | 1967-06-06 | Westinghouse Electric Corp | Method of making heater assemblies by wet-settling techniques |
| DE1283402B (en) * | 1966-03-29 | 1968-11-21 | Siemens Ag | Indirectly heated storage cathode for electrical discharge vessels |
| DE2245717A1 (en) * | 1972-09-18 | 1974-03-28 | Patra Patent Treuhand | ELECTRODE WITH A POROUS SINTER BODY |
| DE3527360C2 (en) * | 1985-07-31 | 1996-04-18 | Licentia Gmbh | Supply cathode |
| GB2188771B (en) * | 1986-04-01 | 1990-12-19 | Ceradyne Inc | Dispenser cathode and method of manufacture therefor |
| DE3627384A1 (en) * | 1986-08-12 | 1988-02-18 | Siemens Ag | INDIRECTLY HEATED STORAGE CATHODE, IN PARTICULAR METAL-CAPILLARY CATHODE, FOR ELECTRICAL DISCHARGE VESSELS |
| JPH11339633A (en) * | 1997-11-04 | 1999-12-10 | Sony Corp | Impregnated cathode and manufacture therefor and electron gun and electronic tube |
| DE102010055175B4 (en) * | 2010-12-20 | 2014-07-10 | Heraeus Precious Metals Gmbh & Co. Kg | Method for producing a medical implant and medical implant |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2121589A (en) * | 1934-06-28 | 1938-06-21 | Westinghouse Electric & Mfg Co | Emissive incandescent cathode |
| US2460739A (en) * | 1946-04-17 | 1949-02-01 | Gen Electric | Electrode construction |
| NL69486C (en) * | 1947-11-26 | |||
| US2643332A (en) * | 1949-03-29 | 1953-06-23 | Hartford Nat Bank & Trust Co | High-frequency electron discharge tube system |
| BE498869A (en) * | 1949-10-25 | |||
| BE512939A (en) * | 1951-07-20 | |||
| NL91132C (en) * | 1951-11-29 |
-
0
- NL NL96853D patent/NL96853C/xx active
-
1953
- 1953-09-24 US US382085A patent/US2830218A/en not_active Expired - Lifetime
-
1954
- 1954-08-10 GB GB23248/54A patent/GB757272A/en not_active Expired
- 1954-09-10 FR FR1112390D patent/FR1112390A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL96853C (en) | |
| FR1112390A (en) | 1956-03-13 |
| US2830218A (en) | 1958-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB757272A (en) | Improvements relating to dispenser cathodes | |
| GB793726A (en) | Improvements in or relating to dispenser cathodes | |
| GB831133A (en) | Improvements relating to thermionic cathodes | |
| GB568962A (en) | Improvements in or relating to cathodes for electron discharge devices | |
| GB1025673A (en) | An anode for a high-pressure discharge lamp | |
| GB713140A (en) | Improvements in or relating to the manufacture of dispenser cathodes | |
| GB1123015A (en) | A process for producing sintered anodes | |
| GB1136999A (en) | Sintered zinc battery anode structure and method of making same | |
| GB739232A (en) | Improvements in or relating to dispenser cathodes | |
| GB1525005A (en) | Thermionic reaction cathode | |
| GB802905A (en) | Improvements in or relating to electrolytic cells for the production of aluminium | |
| GB1267074A (en) | ||
| GB790900A (en) | Improvements relating to cathode assemblies and a method of making them | |
| GB777142A (en) | Improvements in or relating to cathode bodies for use in electric discharge tubes | |
| ES208641A1 (en) | Thermionic cathode | |
| GB1177012A (en) | Tungsten-Containing Electrode | |
| GB1214226A (en) | Plaque for use as battery electrode substrate and method of making | |
| US3010826A (en) | Method of making dispenser type cathodes | |
| GB1394068A (en) | Emissive fused electrode | |
| GB924595A (en) | Method of manufacturing cathodes | |
| GB707512A (en) | Improvements in or relating to methods of making articles from refractory metals by cutting operations and to articles made by means of these methods | |
| GB1158404A (en) | Improvements in or relating to Electrochemical Devices | |
| GB782138A (en) | Improvements in or relating to sintered cathodes | |
| GB963767A (en) | Improvements in or relating to fuel cells | |
| GB950886A (en) | Thoriated thermionic cathode |