GB813609A - Improvements in or relating to thermionic valves - Google Patents
Improvements in or relating to thermionic valvesInfo
- Publication number
- GB813609A GB813609A GB2976456A GB2976456A GB813609A GB 813609 A GB813609 A GB 813609A GB 2976456 A GB2976456 A GB 2976456A GB 2976456 A GB2976456 A GB 2976456A GB 813609 A GB813609 A GB 813609A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nickel
- cobalt
- per cent
- layer
- valve
- 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
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 11
- 229910052759 nickel Inorganic materials 0.000 abstract 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract 4
- 229910052803 cobalt Inorganic materials 0.000 abstract 4
- 239000010941 cobalt Substances 0.000 abstract 4
- 239000000203 mixture Substances 0.000 abstract 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract 2
- 230000003213 activating Effects 0.000 abstract 1
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive Effects 0.000 abstract 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract 1
- -1 alkaline earth metal carbonates Chemical class 0.000 abstract 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 abstract 1
- 239000010406 cathode material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229910052697 platinum Inorganic materials 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 239000003638 reducing agent Substances 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- QSGNKXDSTRDWKA-UHFFFAOYSA-N zirconium dihydride Chemical compound [ZrH2] QSGNKXDSTRDWKA-UHFFFAOYSA-N 0.000 abstract 1
- 229910000568 zirconium hydride Inorganic materials 0.000 abstract 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
813,609. Cathode materials and processing. M.-O. VALVE CO. Ltd., and JENKINS, R. O. Sept. 30, 1957 [Sept. 28, 1956], No. 29764/56. Class 39(1) A thermionic valve cathode has an emissive portion 8 consisting of a powdered pressed mixture of alkaline earth metal carbonates and nickel and/or cobalt, backed by an appreciably thicker layer 9 of nickel and/or cobalt, at least the said layer fitting tightly within a shell 1 having apertures or depressions 5, into which apertures the layer 9 is keyed at its periphery. The emissive portion 8 may be a mixture of 70 per cent by weight carbonyl nickel powder, and the remainder mixed carbonates in the molecular proportions 49À5 per cent. Ba, 43À5 per cent. Sr, and 7 per cent Ca. The powders may be compacted inside the sleeve 1 in a die 3, as shown. After the cathode is assembled inside the valve, it is heated to sinter the layers 8 and 9, at the same time activating the emissive material. The nickel layer 8 contains a small proportion of zirconium hydride as a reducing agent, but according to the Provisional Specification this additive is silicon. The nickel in either or both layers 8, 9 may be wholly or partly replaced by cobalt. The sleeve 1 may be of nickel, cobalt, or platinum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1183545D FR1183545A (en) | 1956-09-28 | 1957-09-28 | Electric discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB813609A true GB813609A (en) | 1959-05-21 |
Family
ID=1741755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2976456A Expired GB813609A (en) | 1956-09-28 | 1956-09-28 | Improvements in or relating to thermionic valves |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB813609A (en) |
-
1956
- 1956-09-28 GB GB2976456A patent/GB813609A/en not_active Expired
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