GB895238A - A cathode with sealing ring for electric discharge devices - Google Patents
A cathode with sealing ring for electric discharge devicesInfo
- Publication number
- GB895238A GB895238A GB2594/59A GB259459A GB895238A GB 895238 A GB895238 A GB 895238A GB 2594/59 A GB2594/59 A GB 2594/59A GB 259459 A GB259459 A GB 259459A GB 895238 A GB895238 A GB 895238A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- quartz
- powder
- sealing ring
- 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
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/02—Details
- H01J17/04—Electrodes; Screens
- H01J17/06—Cathodes
Landscapes
- Cold Cathode And The Manufacture (AREA)
Abstract
895,238. Cathode materials and processing. TESLA, NARODNI PODNIK. Jan. 23, 1959 [Jan. 31, 1958], No. 2594/59. Class 39 (1). A cathode 1 consists of a sintered admixture of quartz glass powder and an electrically conductive metal powder, the active end, from which the quartz has been removed, being provided with an emissive layer 4. The cathode is sintered together with a sealing ring 2 of quartz powder. As shown, the cathode is sealed into a mercury vapour quartz discharge valve and preferably comprises 10% by volume of molybdenum or tungsten powder and 90% quartz powder of the same grain size, e.g. 100-250Á. The sealing ring and cathode may be preformed by use of a binder which may be removed by heating to 350‹ C. in air, and are then placed together in a graphite form and sintered at 1800‹C. in a vacuum or a protective atmosphere. The quartz may be removed from the active end of the cathode by immersion in hydrofluoric acid. The spongy molybdenum layer which is left may be coated with an emissive paste by electrophoresis.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS895238X | 1958-01-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB895238A true GB895238A (en) | 1962-05-02 |
Family
ID=5456591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2594/59A Expired GB895238A (en) | 1958-01-31 | 1959-01-23 | A cathode with sealing ring for electric discharge devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB895238A (en) |
-
1959
- 1959-01-23 GB GB2594/59A patent/GB895238A/en not_active Expired
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