US3676731A - Dispenser cathode structure - Google Patents
Dispenser cathode structure Download PDFInfo
- Publication number
- US3676731A US3676731A US120637A US3676731DA US3676731A US 3676731 A US3676731 A US 3676731A US 120637 A US120637 A US 120637A US 3676731D A US3676731D A US 3676731DA US 3676731 A US3676731 A US 3676731A
- Authority
- US
- United States
- Prior art keywords
- storage chamber
- cover member
- barium
- cathode
- protective coating
- 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
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000003860 storage Methods 0.000 claims abstract description 30
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 16
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 15
- 239000010937 tungsten Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000011253 protective coating Substances 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 239000011347 resin Substances 0.000 claims abstract description 13
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 12
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 12
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052762 osmium Inorganic materials 0.000 claims abstract description 11
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000012188 paraffin wax Substances 0.000 claims abstract description 10
- 229910052788 barium Inorganic materials 0.000 claims abstract description 8
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000002035 prolonged effect Effects 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 abstract description 10
- -1 i.e. Chemical class 0.000 abstract description 8
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 abstract description 5
- 230000004913 activation Effects 0.000 abstract description 3
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical class [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 10
- 239000000243 solution Substances 0.000 description 8
- 238000007789 sealing Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 230000001464 adherent effect Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000011877 solvent mixture Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 2
- XOIMAGBXKCHBPG-UHFFFAOYSA-N [Os].[Re].[W] Chemical compound [Os].[Re].[W] XOIMAGBXKCHBPG-UHFFFAOYSA-N 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-M hexanoate Chemical compound CCCCCC([O-])=O FUZZWVXGSFPDMH-UHFFFAOYSA-M 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241001026509 Kata Species 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- CSSYLTMKCUORDA-UHFFFAOYSA-N barium(2+);oxygen(2-) Chemical class [O-2].[Ba+2] CSSYLTMKCUORDA-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- NEDFZELJKGZAQF-UHFFFAOYSA-J strontium;barium(2+);dicarbonate Chemical compound [Sr+2].[Ba+2].[O-]C([O-])=O.[O-]C([O-])=O NEDFZELJKGZAQF-UHFFFAOYSA-J 0.000 description 1
Images
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
-
- 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
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/28—Dispenser-type cathodes, e.g. L-cathode
Definitions
- desired protection is achieved by coating a suitable sealing member, i.e., a tungsten disk, with a solution of paraffin in chloroform or other suitable solvent.
- a suitable sealing member i.e., a tungsten disk
- the protection afiorded to a porous disk by means of this embodiment is highly effective and even allows the use of barium oxide (which is quite sensitive to humidity) as a supply source material in MK-cathodes, without any adverse effects.
- barium oxide which is quite sensitive to humidity
- MK cathodes which are thus rendered extremely well suited for prolonged storage, have a further improved characteristic in that no essential gas production takes place during the start of the heating process.
- the advantages of cathodes utilizing carbonates supply source materials and osmiumtated or rheniumtated tungsten disks are not diminished or altered and in fact make such cathodes even more advantageous.
- EXAMPLE I 4.0 milliliters of Pexisol P-550 (a trademark for a methyl mathacrylate resin) was dissolved in a solvent mixture of about 1.0 milliliters of butyl acetate and 0.1 gram of 2-ethyl phthalic acid ester. About 0.1 milliliters of this solution was applied, as by plunging or submerging, to a surface of a circular rheniumated tungsten disk having a diameter of about 3 millimeters. After evaporation of the solvent mixture, a thin film of plexiglass (a tradename for methyl mathacrylate resin) remained tightly adherent to the coated surface. This protective coating wasimpervious to water vapor over extended periods of time and wasreadily removed at elevated temperatures without any adverse effect on the disk.
- the cathode structure illustrates, has a cupshaped member 1 with a storage chamber la that is open at its upper edge.
- An amount of a stock supply material such as an alkalineearth metal carbonate or alkaline-earth metal oxide (i.e., barium'strontium carbonate or barium oxide), either in powder or tablet-like form is positioned within the storage chamber 10.
- %he invention provides a novel indirectly heated dispenser cathode structure and method of producing the same.
- the structure comprises a member having an open ended storage chamber for suitable supply source materials and a porous cover member of a suitable metal sealing the storage chamber and provided with a protective vapor-impermeable coating of a hydrophobic material that vaporizes under nonnal cathode operating conditions.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
- Battery Electrode And Active Subsutance (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2010479A DE2010479C3 (de) | 1970-03-05 | 1970-03-05 | Metallkapillar Kathode mit gegen Luftfeuchtigkeit geschütztem porösem Emissionsstofftrager |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3676731A true US3676731A (en) | 1972-07-11 |
Family
ID=5764232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US120637A Expired - Lifetime US3676731A (en) | 1970-03-05 | 1971-03-03 | Dispenser cathode structure |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3676731A (de) |
| CA (1) | CA942373A (de) |
| DE (1) | DE2010479C3 (de) |
| GB (1) | GB1309023A (de) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2947919A1 (de) * | 1978-11-30 | 1980-06-12 | Varian Associates | Vorratskathode, verfahren zu ihrer herstellung sowie pille dafuer |
| US4310603A (en) * | 1978-11-30 | 1982-01-12 | Varian Associates, Inc. | Dispenser cathode |
| EP0053867A1 (de) * | 1980-12-09 | 1982-06-16 | Thorn Emi-Varian Limited | Thermische Elektronenemittoren und Verfahren zu ihrer Herstellung |
| US4803397A (en) * | 1986-08-12 | 1989-02-07 | Siemens Aktiengesellschaft | Indirectly heated dispenser metal capillary cathode for electrical discharge devices |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63236239A (ja) * | 1987-03-10 | 1988-10-03 | シーメンス、アクチエンゲゼルシヤフト | 放電管用デイスペンサー陰極とその製法 |
-
1970
- 1970-03-05 DE DE2010479A patent/DE2010479C3/de not_active Expired
-
1971
- 1971-03-03 US US120637A patent/US3676731A/en not_active Expired - Lifetime
- 1971-03-05 CA CA106,981A patent/CA942373A/en not_active Expired
- 1971-04-19 GB GB2312071*A patent/GB1309023A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2947919A1 (de) * | 1978-11-30 | 1980-06-12 | Varian Associates | Vorratskathode, verfahren zu ihrer herstellung sowie pille dafuer |
| US4310603A (en) * | 1978-11-30 | 1982-01-12 | Varian Associates, Inc. | Dispenser cathode |
| EP0053867A1 (de) * | 1980-12-09 | 1982-06-16 | Thorn Emi-Varian Limited | Thermische Elektronenemittoren und Verfahren zu ihrer Herstellung |
| US4803397A (en) * | 1986-08-12 | 1989-02-07 | Siemens Aktiengesellschaft | Indirectly heated dispenser metal capillary cathode for electrical discharge devices |
Also Published As
| Publication number | Publication date |
|---|---|
| CA942373A (en) | 1974-02-19 |
| DE2010479A1 (de) | 1971-09-16 |
| GB1309023A (en) | 1973-03-07 |
| DE2010479C3 (de) | 1973-11-22 |
| DE2010479B2 (de) | 1973-04-12 |
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