GB1264087A - - Google Patents
Info
- Publication number
- GB1264087A GB1264087A GB1264087DA GB1264087A GB 1264087 A GB1264087 A GB 1264087A GB 1264087D A GB1264087D A GB 1264087DA GB 1264087 A GB1264087 A GB 1264087A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- grains
- sintered
- compressed
- pouring
- 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
- 239000000463 material Substances 0.000 abstract 3
- 239000000203 mixture Substances 0.000 abstract 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 1
- 239000010406 cathode material Substances 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
- 229910052762 osmium Inorganic materials 0.000 abstract 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
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)
Abstract
1,264,087. Cathode materials and processing. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 18 Nov., 1970 [21 Nov., 1969], No. 54816/70. Heading H1D. A method of manufacturing a dispenser cathode comprises the steps of pouring a granular sintered first material into a holder 1, preferably a molybdenum cup to form a first layer 4, pouring in a second granular sintered material to form a second layer 5, then compressing the layers into the holder by means of a die. The layer 4 in an example comprises grains formed by mixing 20-80% by weight W powder together with powdered coprecipitated : 5BaCO 3 , 3CaCO 3 , and 2Al 2 O 3 . The mixture is compressed into a block, sintered and ground to produce grains of 36Á-135Á. Further grains are produced of the same composition together with 3% reducing agent, e.g. C, Th, Ti, or Zr, and the two types of grain are respectively mixed in the proportion 3 : 1 to form layer 4. Layer 5 comprising grains of sintered W is added and the layers are compressed until the W layer has a density equal to 75% that of solid W. A third layer 11 of osmium may be added prior to sintering at a temperature of 1550‹ C. when little shrinkage of the compressed materials occurs as stated. The Mo cup is then welded simultaneously with suspension strips 7 to a Mo sleeve in which the heater 9 is housed in an insulating material 10.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6917538A NL6917538A (en) | 1969-11-21 | 1969-11-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1264087A true GB1264087A (en) | 1972-02-16 |
Family
ID=19808445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1264087D Expired GB1264087A (en) | 1969-11-21 | 1970-11-18 |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE759174A (en) |
| CA (1) | CA960007A (en) |
| DE (1) | DE2054698A1 (en) |
| FR (1) | FR2069601A5 (en) |
| GB (1) | GB1264087A (en) |
| NL (1) | NL6917538A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0028954A1 (en) * | 1979-11-09 | 1981-05-20 | Thomson-Csf | Thermionic cathode, process for manufacturing it and electron tube incorporating such a cathode |
| GB2127617A (en) * | 1981-12-11 | 1984-04-11 | Tokyo Shibaura Electric Co | Cathode structure for electron tube |
| GB2188771A (en) * | 1986-04-01 | 1987-10-07 | Ceradyne Inc | Dispenser cathode |
| GB2196786A (en) * | 1986-10-27 | 1988-05-05 | Ceradyne Inc | Cathode assembly |
| EP0510941A1 (en) * | 1991-04-23 | 1992-10-28 | Goldstar Co. Ltd. | Method for manufacturing impregnated cathodes |
| EP0512280A1 (en) * | 1991-05-07 | 1992-11-11 | Licentia Patent-Verwaltungs-GmbH | Dispenser cathode and method of fabricating same |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2808134A1 (en) * | 1978-02-25 | 1979-08-30 | Licentia Gmbh | Long-life cathode with porous two layer emitter - has emitting layer thinner and of lower porosity than supporting layer |
| DE2822665A1 (en) * | 1978-05-05 | 1979-11-08 | Bbc Brown Boveri & Cie | GLOW CATHODE MATERIAL |
| DE2842079A1 (en) * | 1978-09-27 | 1980-04-03 | Siemens Ag | SUPPLY CATHODE, ESPECIALLY METAL CAPILLARY CATHODE |
| FR2494035A1 (en) * | 1980-11-07 | 1982-05-14 | Thomson Csf | THERMO-ELECTRONIC CATHODE FOR MICROFREQUENCY TUBE AND TUBE INCORPORATING SUCH A CATHODE |
| DE3336489A1 (en) * | 1983-10-07 | 1985-04-25 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Indirectly heated dispenser cathode |
| FR2683090A1 (en) * | 1991-10-25 | 1993-04-30 | Europ Composants Electron | Dispenser cathode and method of manufacture of such a cathode |
-
0
- BE BE759174D patent/BE759174A/en unknown
-
1969
- 1969-11-21 NL NL6917538A patent/NL6917538A/xx unknown
-
1970
- 1970-11-06 DE DE19702054698 patent/DE2054698A1/en active Pending
- 1970-11-18 CA CA098,418A patent/CA960007A/en not_active Expired
- 1970-11-18 GB GB1264087D patent/GB1264087A/en not_active Expired
- 1970-11-18 FR FR7041351A patent/FR2069601A5/fr not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0028954A1 (en) * | 1979-11-09 | 1981-05-20 | Thomson-Csf | Thermionic cathode, process for manufacturing it and electron tube incorporating such a cathode |
| GB2127617A (en) * | 1981-12-11 | 1984-04-11 | Tokyo Shibaura Electric Co | Cathode structure for electron tube |
| US4524296A (en) * | 1981-12-11 | 1985-06-18 | Tokyo Shibaura Denki Kabushiki Kaisha | Cathode structure for electron tube |
| GB2188771A (en) * | 1986-04-01 | 1987-10-07 | Ceradyne Inc | Dispenser cathode |
| GB2188771B (en) * | 1986-04-01 | 1990-12-19 | Ceradyne Inc | Dispenser cathode and method of manufacture therefor |
| GB2196786A (en) * | 1986-10-27 | 1988-05-05 | Ceradyne Inc | Cathode assembly |
| EP0510941A1 (en) * | 1991-04-23 | 1992-10-28 | Goldstar Co. Ltd. | Method for manufacturing impregnated cathodes |
| EP0512280A1 (en) * | 1991-05-07 | 1992-11-11 | Licentia Patent-Verwaltungs-GmbH | Dispenser cathode and method of fabricating same |
Also Published As
| Publication number | Publication date |
|---|---|
| BE759174A (en) | 1971-05-19 |
| DE2054698A1 (en) | 1971-11-18 |
| NL6917538A (en) | 1971-05-25 |
| FR2069601A5 (en) | 1971-09-03 |
| CA960007A (en) | 1974-12-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |