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GB1359789A - Method of covering a heater with an electrically insulating layer - Google Patents

Method of covering a heater with an electrically insulating layer

Info

Publication number
GB1359789A
GB1359789A GB3077872A GB3077872A GB1359789A GB 1359789 A GB1359789 A GB 1359789A GB 3077872 A GB3077872 A GB 3077872A GB 3077872 A GB3077872 A GB 3077872A GB 1359789 A GB1359789 A GB 1359789A
Authority
GB
United Kingdom
Prior art keywords
binder
solvent
wire
heater
layers
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
Application number
GB3077872A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1359789A publication Critical patent/GB1359789A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Laminated Bodies (AREA)

Abstract

1359789 Thermionic cathode constructions PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 30 June 1972 [3 July 1971] 30778/72 Heading H1D A method of forming a superficially dark insulating coating on a heater wire for an indirectly heated cathode comprises electrophoretically depositing a first binder (e.g. PVA) and a first metal oxide (Al 2 O 3 ) on the wire; applying a suspension containing a dark material (W powder), a second metal oxide (Al 2 O 3 ), a solution of a second different binder (polymethacrylate in petroleum spirit), a solvent for the first binder (xylene) and a substance (petroleum spirit) which mitigates attack of the first binder by the solvent; and heating the wire to sinter the two layers, the suspension containing only sufficient solvent for the first binder to promote adhesion between the layers. The oxides may be Al 2 O 3 , ThO 2 , ZrO 2 , MgO or BeO. Sintering takes place at 1600‹ C. in H 2 -N 2 atmosphere.
GB3077872A 1971-07-03 1972-06-30 Method of covering a heater with an electrically insulating layer Expired GB1359789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7109224A NL7109224A (en) 1971-07-03 1971-07-03

Publications (1)

Publication Number Publication Date
GB1359789A true GB1359789A (en) 1974-07-10

Family

ID=19813548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3077872A Expired GB1359789A (en) 1971-07-03 1972-06-30 Method of covering a heater with an electrically insulating layer

Country Status (6)

Country Link
US (1) US3770601A (en)
JP (1) JPS526137B1 (en)
CA (1) CA958758A (en)
FR (1) FR2144745B1 (en)
GB (1) GB1359789A (en)
NL (1) NL7109224A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190788A (en) * 1986-05-16 1987-11-25 English Electric Valve Co Ltd Cathode

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808043A (en) * 1972-05-30 1974-04-30 Rca Corp Method of fabricating a dark heater
US3930868A (en) * 1973-05-23 1976-01-06 The Richardson Company Light sensitive arylglyoxyacrylate compositions
JPS5778609U (en) * 1980-10-30 1982-05-15
US4789309A (en) * 1987-12-07 1988-12-06 Saes Getters Spa Reinforced insulated heater getter device
NL8802387A (en) * 1988-09-29 1990-04-17 Philips Nv METHOD FOR APPLYING A THERMAL BLACK COAT TO A HEATING BODY FOR AN INDIRECTLY HEATED CATHOD.
JP6662334B2 (en) 2017-03-22 2020-03-11 ヤマハ株式会社 Sound processing device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE530668A (en) * 1953-07-27
US3024184A (en) * 1958-09-29 1962-03-06 Sylvania Electric Prod Electrophoretic article coating machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190788A (en) * 1986-05-16 1987-11-25 English Electric Valve Co Ltd Cathode
US4810925A (en) * 1986-05-16 1989-03-07 English Electric Valve Company Limited Directly heated cathodes
GB2190788B (en) * 1986-05-16 1990-07-25 English Electric Valve Co Ltd Directly heated cathodes

Also Published As

Publication number Publication date
CA958758A (en) 1974-12-03
NL7109224A (en) 1973-01-05
JPS526137B1 (en) 1977-02-19
FR2144745A1 (en) 1973-02-16
FR2144745B1 (en) 1977-04-01
DE2230750B2 (en) 1976-01-08
US3770601A (en) 1973-11-06
DE2230750A1 (en) 1973-01-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee