US3770601A - Method of electrocoating a heating member with a dark-coloured insulating layer and heating member for an indirectly heated cathode manufactured by said method - Google Patents
Method of electrocoating a heating member with a dark-coloured insulating layer and heating member for an indirectly heated cathode manufactured by said method Download PDFInfo
- Publication number
- US3770601A US3770601A US00267577A US3770601DA US3770601A US 3770601 A US3770601 A US 3770601A US 00267577 A US00267577 A US 00267577A US 3770601D A US3770601D A US 3770601DA US 3770601 A US3770601 A US 3770601A
- Authority
- US
- United States
- Prior art keywords
- layer
- heating member
- dark
- insulating layer
- indirectly heated
- 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
- 238000000034 method Methods 0.000 title claims description 15
- 238000010438 heat treatment Methods 0.000 title claims description 14
- 238000004070 electrodeposition Methods 0.000 title description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000008096 xylene Substances 0.000 claims abstract description 13
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 7
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims description 17
- 239000002904 solvent Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000009835 boiling Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 12
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 7
- 150000004706 metal oxides Chemical class 0.000 description 7
- 239000000725 suspension Substances 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 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
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000549 coloured material Substances 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 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
- H01J9/08—Manufacture of heaters for indirectly-heated cathodes
Definitions
- the invention relates to a method of covering a heating member for an indirectly heated cathode with an insulating layer which is dark-coloured at the surface, in which adark-coloured layer is provided on an unsintered insulating layer after which both layers are simultaneously heated and sintered.
- the invention furthermore relates to a heating member manufactured by means of said method.
- German Patent Specification 1,281,038 it is known from German Patent Specification 1,281,038 to provide a dark-colouredtungstic acidfication 1,355,710 to provide a black zirconium oxidecontaining layer on an unsintered aluminium oxide layer and to add collodium to both layers as a binder. In this known method, the two layers were simultaneously sintered. I
- a very favourable method of covering a heating member for an indirectly heated cathode with an insulating layer which is coloured dark at the surface, in which a dark-coloured second layer is provided on an unsintered first insulating layer consisting of a suitable metal oxide and a binder, after which both layers are simultaneously heated and sintered, is obtained, if according to the invention, the metal oxide and the binder of the first layer are both provided electrophoretically on the heating wire, after which on said first layer is provided a second layer of a suspension containing a darkcoloured material anda suitable metal oxide in a finely divided condition, a solution of a binder, a solvent for the binder present in the first layer, and a material which hampers the action of said solvent on the binder in the first layer.
- the first layer may consist of an oxide of aluminium, magnesium or beryllium with polyvinyl acetate as a binder, which materials are both provided by electrophoresis from methanol on a filament which, for exammethods ple, is helically wound.
- a darkcoloured second layer is provided consisting of a suspension containing:
- polymetacrylate solution 400 g of polymetacrylate in 1000 ml of petrol of boiling point between 100C and 140C 700 ml of xylene,
- the ratio of the quantities of petrol and xylene may be between 7 :3
- the particle size distribution of the metal oxide present in the suspension for the dark-coloured second layer preferably is: 14 percent smaller than 1 u, 100% smaller than 8 iii stead ofthe aluminium oxide, the oxide of thorium (ThO beryllium (BeO), zirconium (ZrO,) or magnesium (MgO) may be used in said suspension.
- a heating rnernber comprising a first insulating layer and a dark second layer provided by means of the method as claimed in claim 1.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
- Laminated Bodies (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7109224A NL7109224A (enrdf_load_stackoverflow) | 1971-07-03 | 1971-07-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3770601A true US3770601A (en) | 1973-11-06 |
Family
ID=19813548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00267577A Expired - Lifetime US3770601A (en) | 1971-07-03 | 1972-06-29 | Method of electrocoating a heating member with a dark-coloured insulating layer and heating member for an indirectly heated cathode manufactured by said method |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3770601A (enrdf_load_stackoverflow) |
| JP (1) | JPS526137B1 (enrdf_load_stackoverflow) |
| CA (1) | CA958758A (enrdf_load_stackoverflow) |
| FR (1) | FR2144745B1 (enrdf_load_stackoverflow) |
| GB (1) | GB1359789A (enrdf_load_stackoverflow) |
| NL (1) | NL7109224A (enrdf_load_stackoverflow) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4077806A (en) * | 1973-05-23 | 1978-03-07 | The Richardson Company | Light sensitive composition and products thereof |
| US4789309A (en) * | 1987-12-07 | 1988-12-06 | Saes Getters Spa | Reinforced insulated heater getter device |
| EP0364018A1 (en) * | 1988-09-29 | 1990-04-18 | Koninklijke Philips Electronics N.V. | Method of applying a thermally black layer to a heating member for an indirectly heated cathode |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3808043A (en) * | 1972-05-30 | 1974-04-30 | Rca Corp | Method of fabricating a dark heater |
| JPS5778609U (enrdf_load_stackoverflow) * | 1980-10-30 | 1982-05-15 | ||
| GB8611967D0 (en) * | 1986-05-16 | 1986-10-29 | English Electric Valve Co Ltd | Directly heated cathodes |
| JP6662334B2 (ja) | 2017-03-22 | 2020-03-11 | ヤマハ株式会社 | 音響処理装置 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2800446A (en) * | 1953-07-27 | 1957-07-23 | Rca Corp | Electron emissive coating material and method of application |
| US3024184A (en) * | 1958-09-29 | 1962-03-06 | Sylvania Electric Prod | Electrophoretic article coating machine |
-
1971
- 1971-07-03 NL NL7109224A patent/NL7109224A/xx unknown
-
1972
- 1972-06-28 CA CA145,878A patent/CA958758A/en not_active Expired
- 1972-06-29 US US00267577A patent/US3770601A/en not_active Expired - Lifetime
- 1972-06-30 GB GB3077872A patent/GB1359789A/en not_active Expired
- 1972-06-30 JP JP47065819A patent/JPS526137B1/ja active Pending
- 1972-07-03 FR FR7224010A patent/FR2144745B1/fr not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2800446A (en) * | 1953-07-27 | 1957-07-23 | Rca Corp | Electron emissive coating material and method of application |
| US3024184A (en) * | 1958-09-29 | 1962-03-06 | Sylvania Electric Prod | Electrophoretic article coating machine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4077806A (en) * | 1973-05-23 | 1978-03-07 | The Richardson Company | Light sensitive composition and products thereof |
| US4789309A (en) * | 1987-12-07 | 1988-12-06 | Saes Getters Spa | Reinforced insulated heater getter device |
| EP0364018A1 (en) * | 1988-09-29 | 1990-04-18 | Koninklijke Philips Electronics N.V. | Method of applying a thermally black layer to a heating member for an indirectly heated cathode |
| US4983420A (en) * | 1988-09-29 | 1991-01-08 | U.S. Philips Corporation | Method of applying a thermally black layer to a heating member for an indirectly heated cathode |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2230750B2 (de) | 1976-01-08 |
| FR2144745B1 (enrdf_load_stackoverflow) | 1977-04-01 |
| CA958758A (en) | 1974-12-03 |
| GB1359789A (en) | 1974-07-10 |
| NL7109224A (enrdf_load_stackoverflow) | 1973-01-05 |
| FR2144745A1 (enrdf_load_stackoverflow) | 1973-02-16 |
| DE2230750A1 (de) | 1973-01-11 |
| JPS526137B1 (enrdf_load_stackoverflow) | 1977-02-19 |
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