US1821359A - Wehnelt-cathode - Google Patents
Wehnelt-cathode Download PDFInfo
- Publication number
- US1821359A US1821359A US352597A US35259729A US1821359A US 1821359 A US1821359 A US 1821359A US 352597 A US352597 A US 352597A US 35259729 A US35259729 A US 35259729A US 1821359 A US1821359 A US 1821359A
- Authority
- US
- United States
- Prior art keywords
- cathode
- wehnelt
- compound
- beryllium
- zirconium
- 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
- 150000001875 compounds Chemical class 0.000 description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 3
- 229910001928 zirconium oxide Inorganic materials 0.000 description 3
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 2
- 229910052790 beryllium Inorganic materials 0.000 description 2
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 2
- 150000001573 beryllium compounds Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000003755 zirconium compounds Chemical class 0.000 description 2
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 description 1
- 244000171897 Acacia nilotica subsp nilotica Species 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 150000001553 barium compounds Chemical class 0.000 description 1
- ZBUQRSWEONVBES-UHFFFAOYSA-L beryllium carbonate Chemical compound [Be+2].[O-]C([O-])=O ZBUQRSWEONVBES-UHFFFAOYSA-L 0.000 description 1
- 229910000023 beryllium carbonate Inorganic materials 0.000 description 1
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- -1 oxides Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 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
- H01J1/14—Solid thermionic cathodes characterised by the material
-
- 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
- the invention concerns cathodes, more particularly, Wehnelt-cathodes, and the process of manufacturing the same, and has for its object the provision of a cathode havl ing long life.
- a Wehnelt-cathode contains metallic compounds, such as oxides, which when heated emit electrons.
- the Wehnelt-cathode contains, in addition to the active emitting compound consisting, for example, of barium or a barium compound, a beryllium compound, preferably beryllium oxide. This has been found to increase the life of the cathode. Particular] good results are obtained by adding am a zirconium compound, preferab y zirconium oxide.
- a cathode which, ,in addition to the active emitting compound, contains both a beryllium and a zirconium compound, has proved I so to possess better emitting and lasting properties than a cathode which contains only a beryllium compound or only .a zirconium. compound.
- Such a Wehnelt-cathode can be manufactured by coating a core with a suspension of barium carbonate, beryllium carbonate, zirconium oxide, and if desired, an agglutinant, e. g. arabic, and by subsequently heating t e body, preferably in a vacuum, and
- the core may, for example, be anickel wire, or a tun 11 wire having helically wound on it a mckel wire.
- a process of manufacturing a Wehneltcathode in which the core is coated with a sus nsion of barium carbonate, beryllium car onate, zirconium oxide and an agglutinant, and is subsequently heated in a vacuum.
Description
Patented sq. 1, 1931 1,821,359
UNITED STATES PATENT OFFICE ENG-BEBE. HABHEN BEERINK AND J'OEANNES GIJ'SBEETU'S WILHELI mu, 0] EINDHOVEN, NETHERLANDS, ASSIGNORS 1'0 RADIO QOBPOBATION OI AIERIGA, A CORPORATION OF DELAWARE WEHNELT-CATHODE No Drawing. -App1icati0n fled April 4, 1929, Serial No. 352,597, and in the Ietherluds April 18, 1988.
The invention concerns cathodes, more particularly, Wehnelt-cathodes, and the process of manufacturing the same, and has for its object the provision of a cathode havl ing long life. As is known, a Wehnelt-cathode contains metallic compounds, such as oxides, which when heated emit electrons.
In our invention, the Wehnelt-cathode contains, in addition to the active emitting compound consisting, for example, of barium or a barium compound, a beryllium compound, preferably beryllium oxide. This has been found to increase the life of the cathode. Particular] good results are obtained by adding am a zirconium compound, preferab y zirconium oxide. A cathode which, ,in addition to the active emitting compound, contains both a beryllium and a zirconium compound, has proved I so to possess better emitting and lasting properties than a cathode which contains only a beryllium compound or only .a zirconium. compound.
Such a Wehnelt-cathode can be manufactured by coating a core with a suspension of barium carbonate, beryllium carbonate, zirconium oxide, and if desired, an agglutinant, e. g. arabic, and by subsequently heating t e body, preferably in a vacuum, and
30 preferably to a temperature of about 1000 C. The core may, for example, be anickel wire, or a tun 11 wire having helically wound on it a mckel wire.
I claim:
A process of manufacturing a Wehneltcathode, in which the core is coated with a sus nsion of barium carbonate, beryllium car onate, zirconium oxide and an agglutinant, and is subsequently heated in a vacuum.
ENGBER'I' BAR-Eli REERINK. JOHAIINES GIJSIERTUS ILIIELM MULDER.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL309578X | 1928-04-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1821359A true US1821359A (en) | 1931-09-01 |
Family
ID=19783587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US352597A Expired - Lifetime US1821359A (en) | 1928-04-13 | 1929-04-04 | Wehnelt-cathode |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1821359A (en) |
| BE (1) | BE359097A (en) |
| FR (1) | FR671657A (en) |
| GB (1) | GB309578A (en) |
| NL (1) | NL23762C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2530394A (en) * | 1947-06-05 | 1950-11-21 | Sylvania Electric Prod | Electrode coating for discharge devices |
| US2552654A (en) * | 1948-08-30 | 1951-05-15 | Rca Corp | Heat-resistant cathode coatings |
| US2663816A (en) * | 1949-09-28 | 1953-12-22 | Sylvania Electric Prod | Electric discharge lamp |
| DE974888C (en) * | 1952-03-24 | 1961-05-25 | Philips Nv | Process for the manufacture of a cathode for electrical discharge tubes |
| US3134691A (en) * | 1960-10-18 | 1964-05-26 | Tesla Np | Heating filament assembly and a method of preparing same |
-
0
- NL NL23762D patent/NL23762C/xx active
- BE BE359097D patent/BE359097A/xx unknown
-
1929
- 1929-03-18 FR FR671657D patent/FR671657A/en not_active Expired
- 1929-03-18 GB GB8714/29A patent/GB309578A/en not_active Expired
- 1929-04-04 US US352597A patent/US1821359A/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2530394A (en) * | 1947-06-05 | 1950-11-21 | Sylvania Electric Prod | Electrode coating for discharge devices |
| US2552654A (en) * | 1948-08-30 | 1951-05-15 | Rca Corp | Heat-resistant cathode coatings |
| US2663816A (en) * | 1949-09-28 | 1953-12-22 | Sylvania Electric Prod | Electric discharge lamp |
| DE974888C (en) * | 1952-03-24 | 1961-05-25 | Philips Nv | Process for the manufacture of a cathode for electrical discharge tubes |
| US3134691A (en) * | 1960-10-18 | 1964-05-26 | Tesla Np | Heating filament assembly and a method of preparing same |
Also Published As
| Publication number | Publication date |
|---|---|
| NL23762C (en) | |
| GB309578A (en) | 1930-03-06 |
| BE359097A (en) | |
| FR671657A (en) | 1929-12-16 |
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