US2214902A - Method of producing cathode materials - Google Patents
Method of producing cathode materials Download PDFInfo
- Publication number
- US2214902A US2214902A US311136A US31113639A US2214902A US 2214902 A US2214902 A US 2214902A US 311136 A US311136 A US 311136A US 31113639 A US31113639 A US 31113639A US 2214902 A US2214902 A US 2214902A
- Authority
- US
- United States
- Prior art keywords
- thorium
- cathode materials
- rhenium
- producing cathode
- producing
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 title description 5
- 239000010406 cathode material Substances 0.000 title description 4
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 9
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 8
- 229910052776 Thorium Inorganic materials 0.000 description 8
- 229910052702 rhenium Inorganic materials 0.000 description 7
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 description 2
- 229910003452 thorium oxide Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002052 molecular layer Substances 0.000 description 1
- DYIZHKNUQPHNJY-UHFFFAOYSA-N oxorhenium Chemical compound [Re]=O DYIZHKNUQPHNJY-UHFFFAOYSA-N 0.000 description 1
- 229910003449 rhenium oxide Inorganic materials 0.000 description 1
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
Definitions
- This invention relates to methods of producing cathode materials and consists in certain features of novelty which will be readily understood from the following and be pointed out in the ap- 5 pended claims.
- the rhenium does not form any carbide, it involves such high absorption properties with respect to thorium that no appreciable evaporation of the thorium from its superficies will take place at normal operating temperatures of say 1800 degrees centigrade.
- thoriated rhenium cath- 5 odes The manufacture of thoriated rhenium cath- 5 odes is similar to that of thoriated tungsten cathodes.
- the method of producing cathode materials which comprises mixing metallic rhenium pow- 15 der and an additional amount up to 10 per cent of pulverized thorium oxide, compressing the resulting mixture at high pressure, and sintering the compressed compound in a protective gaseous atmosphere.
- the method of producing cathodes for electron discharge devices which comprises mixing metallic rhenium powder and an additional amount of up to 10-per cent of pulverized thorium oxide, compressing this mixture at high pressure, sintering the compressed compound in a protective gaseous atmosphere, and hammering the resulting blocks to the desirable shape and size.
- a cathode for electron discharge devices consisting of rhenium and an additional amount of up to 10 per cent of thorium.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Discharge Lamp (AREA)
Description
Patented Sept. 17, 1940 METHOD OF PRODUCING CATHODE MATERIALS Felix Herriger, Berlin, Germany, assignor to G. Lorenz Aktiengesellschaft, Berlin-Tempelhof,
Germany, a company No Drawing. Application December 27, 1939, Se-
rial No. 311,136. In Germany December 2,
3 Claims.
This invention relates to methods of producing cathode materials and consists in certain features of novelty which will be readily understood from the following and be pointed out in the ap- 5 pended claims.
It is a known fact that the electron emissive performance of thoriated tungsten cathodes on account of the absorbed mono-atomic molecular layer of thorium is lower than if the cathode is made of pure tungsten. It is also familiar to those skilled in the art that even thoriated tantalum cathodes do not give any increase with respect to the electron emission performance since the two elements thorium and tantalum are classified in the same group or family of the periodic system, from which follows that the dipole momentum, which inherently contributes toward a reduction of the electron emission performance, assumes a very low value.
Careful investigations made by applicant have proven that the dipole momentum still-may be increased. This is accomplished according to this invention by replacing the bearing cathode element tungsten by rhenium which also possesses a very high melting point. The dipole momentum between the elements thorium and rhenium is considerably higher than between thorium and tungsten, so that the electron emission performance is proportionately reduced. This 30 effect is causitive to the classification of thorium and rhenium in the periodic system.
Although the rhenium does not form any carbide, it involves such high absorption properties with respect to thorium that no appreciable evaporation of the thorium from its superficies will take place at normal operating temperatures of say 1800 degrees centigrade.
The manufacture of thoriated rhenium cath- 5 odes is similar to that of thoriated tungsten cathodes. To the metallic rhenium powder there is added up to 10 per cent of powdered rhenium oxide. This mixture is first compressed at a high pressure and then sintered in a protective gase- 10 ous atmosphere, whereupon the resulting blocks are hammered to the desirable shape and size.
What is claimed is:
1. The method of producing cathode materials which comprises mixing metallic rhenium pow- 15 der and an additional amount up to 10 per cent of pulverized thorium oxide, compressing the resulting mixture at high pressure, and sintering the compressed compound in a protective gaseous atmosphere. 20
2. The method of producing cathodes for electron discharge devices which comprises mixing metallic rhenium powder and an additional amount of up to 10-per cent of pulverized thorium oxide, compressing this mixture at high pressure, sintering the compressed compound in a protective gaseous atmosphere, and hammering the resulting blocks to the desirable shape and size.
3. As a product of manufacture, a cathode for electron discharge devices consisting of rhenium and an additional amount of up to 10 per cent of thorium.
FELIX HERRIGER.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE215769X | 1938-12-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2214902A true US2214902A (en) | 1940-09-17 |
Family
ID=5825698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US311136A Expired - Lifetime US2214902A (en) | 1938-12-02 | 1939-12-27 | Method of producing cathode materials |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2214902A (en) |
| CH (1) | CH215769A (en) |
| FR (1) | FR868423A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2520760A (en) * | 1946-03-05 | 1950-08-29 | Csf | Method of producing cathodes for electronic tubes |
| US2733319A (en) * | 1950-07-14 | 1956-01-31 | Material for electric contacts | |
| US2879432A (en) * | 1956-03-16 | 1959-03-24 | Gen Electric | Electron emitter |
| US3175904A (en) * | 1961-10-30 | 1965-03-30 | New England Materials Lab Inc | Dispersion strengthening of platinumbase alloys |
-
1939
- 1939-11-28 CH CH215769D patent/CH215769A/en unknown
- 1939-12-27 US US311136A patent/US2214902A/en not_active Expired - Lifetime
-
1940
- 1940-12-27 FR FR868423D patent/FR868423A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2520760A (en) * | 1946-03-05 | 1950-08-29 | Csf | Method of producing cathodes for electronic tubes |
| US2733319A (en) * | 1950-07-14 | 1956-01-31 | Material for electric contacts | |
| US2879432A (en) * | 1956-03-16 | 1959-03-24 | Gen Electric | Electron emitter |
| US3175904A (en) * | 1961-10-30 | 1965-03-30 | New England Materials Lab Inc | Dispersion strengthening of platinumbase alloys |
Also Published As
| Publication number | Publication date |
|---|---|
| FR868423A (en) | 1941-12-30 |
| CH215769A (en) | 1941-07-15 |
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