GB436527A - Improvements in or relating to the production of highly electro-positive metals within sealed vessels, such for example as thermionic valves - Google Patents
Improvements in or relating to the production of highly electro-positive metals within sealed vessels, such for example as thermionic valvesInfo
- Publication number
- GB436527A GB436527A GB1103934A GB1103934A GB436527A GB 436527 A GB436527 A GB 436527A GB 1103934 A GB1103934 A GB 1103934A GB 1103934 A GB1103934 A GB 1103934A GB 436527 A GB436527 A GB 436527A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heated
- aluminium
- oxides
- carbonate
- metal
- 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
- H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
- H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
- H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
- H01J7/183—Composition or manufacture of getters
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
In the production of a material for depositing alkali and alkaline earth metals within sealed vessels for photo-electric cathodes, gettering and other purposes, a mixture of an oxide or carbonate of the metal and aluminium, the number of atoms of aluminium being equal to or rather larger than the number of oxygen atoms or CO3 radicals, is heated in hydrogen at atmospheric pressure to about 1000 DEG C. It is stated that the resulting product is stable in air and that the electropositive metal can be liberated by heat. In preparing the material, oxides of barium, strontium, calcium, and lithium are preferable and p carbonate of sodium. The process is not practically possible for caesium and barely so for potassium. When oxides are employed they may be heated in vacuo instead of in hydrogen, and at a temperature of only 700 DEG C. gas being continually pumped out.ALSO:Relates to the production of deposits of alkali and alkaline earth metals within sealed vessels for photo-electric cathodes, gettering and other purposes. A mixture of an oxide or carbonate of the metal and aluminium, the number of atoms of aluminium being equal to or rather larger than the number of oxygen atoms or CO3 radicals, is heated in hydrogen at atmospheric pressure to about 1000 DEG C. It is stated that the resulting product is stable in air and that the electropositive metal can be liberated by heat. This product is introduced into the vessel in pellets or otherwise and heated in vacuo to 1000 DEG C., or over. In preparing the material, oxides of barium, strontium, calcium, and lithium are preferable and carbonate of sodium. The process is not practically possible for caesium and barely so for potassium. When oxides are employed they may be heated in vacuo instead of in hydrogen, and at a temperature of only 700 DEG C., gas being continually pumped out. In producing a photo-electric cathode the material may be enclosed in a nickel tube, which may be heated by a resistant coil and directs the metal to the required spot.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE408891D BE408891A (en) | 1934-04-12 | ||
| GB1103934A GB436527A (en) | 1934-04-12 | 1934-04-12 | Improvements in or relating to the production of highly electro-positive metals within sealed vessels, such for example as thermionic valves |
| FR788050D FR788050A (en) | 1934-04-12 | 1935-03-29 | Sensing material for vacuum tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1103934A GB436527A (en) | 1934-04-12 | 1934-04-12 | Improvements in or relating to the production of highly electro-positive metals within sealed vessels, such for example as thermionic valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB436527A true GB436527A (en) | 1935-10-14 |
Family
ID=9978905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1103934A Expired GB436527A (en) | 1934-04-12 | 1934-04-12 | Improvements in or relating to the production of highly electro-positive metals within sealed vessels, such for example as thermionic valves |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE408891A (en) |
| FR (1) | FR788050A (en) |
| GB (1) | GB436527A (en) |
-
0
- BE BE408891D patent/BE408891A/xx unknown
-
1934
- 1934-04-12 GB GB1103934A patent/GB436527A/en not_active Expired
-
1935
- 1935-03-29 FR FR788050D patent/FR788050A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE408891A (en) | |
| FR788050A (en) | 1935-10-02 |
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