GB1418196A - Fabrication of dark heaters - Google Patents

Fabrication of dark heaters

Info

Publication number
GB1418196A
GB1418196A GB1602173A GB1602173A GB1418196A GB 1418196 A GB1418196 A GB 1418196A GB 1602173 A GB1602173 A GB 1602173A GB 1602173 A GB1602173 A GB 1602173A GB 1418196 A GB1418196 A GB 1418196A
Authority
GB
United Kingdom
Prior art keywords
particles
bath
april
coated
dark
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
GB1602173A
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Publication of GB1418196A publication Critical patent/GB1418196A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • 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

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Solid Thermionic Cathode (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

1418196 Thermionic cathode constrictions RCA CORPORATION 4 April 1973 [7 April 1972] 16021/73 Heading H1D An insulated thermionic cathode "dark" heater is coated with particles of high thermal emissivity material by passing it through a bath comprising a liquid vehicle in which the particles are evenly dispersed. This prevents the particles penetrating the insulation and reducing to resistance. Penetration is caused by liquid near the surface of the bath containing a low concentration of particles and hence having a low viscosity and high penetrating ability. A cathode heater for a colour TV tube comprising an Al 2 O 3 coated W wire is dipped in a bath of W particles dispersed in nitrocellulose, alcohol and butyl acetate. The particles are 0À5 to 10 Á in size. The bath is prepared by ball milling the particles and liquid until the specific gravity or viscosity reaches a stable value. The bath may additionally contain Al 2 O 3 particles. Mo, C, Cr 2 O 3 , BN 3 , SiC particles may be used instead of W. The insulating coating may be ZrO, BeO or Cr 2 O 3 and TiO 2 .
GB1602173A 1972-04-07 1973-04-04 Fabrication of dark heaters Expired GB1418196A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00242240A US3852105A (en) 1972-04-07 1972-04-07 Fabrication of dark heaters

Publications (1)

Publication Number Publication Date
GB1418196A true GB1418196A (en) 1975-12-17

Family

ID=22914004

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1602173A Expired GB1418196A (en) 1972-04-07 1973-04-04 Fabrication of dark heaters

Country Status (6)

Country Link
US (1) US3852105A (en)
JP (1) JPS5331591B2 (en)
CA (1) CA1014805A (en)
FR (1) FR2179251B1 (en)
GB (1) GB1418196A (en)
NL (1) NL7304824A (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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1074284A (en) * 1976-06-07 1980-03-25 Ethyl Corporation Chemical process
JPH0622095B2 (en) * 1985-05-17 1994-03-23 株式会社日立製作所 Dark heater manufacturing method
DE3628363A1 (en) * 1986-08-21 1988-02-25 Mtu Muenchen Gmbh PROCESS FOR PRODUCING PROTECTIVE LAYERS
DE19837007C2 (en) * 1998-08-14 2003-07-03 Siemens Ag Method for producing a component of the vacuum housing of an electron tube formed from a metal
US20050194374A1 (en) * 2004-03-02 2005-09-08 Applied Materials, Inc. Heated ceramic substrate support with protective coating

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764511A (en) * 1953-08-28 1956-09-25 Sylvania Electric Prod Filamentary cathode and method of making same
US3246197A (en) * 1962-10-02 1966-04-12 Westinghouse Electric Corp Cathode heater having an aluminum oxide and tungesten coating
BE637284A (en) * 1963-08-29
GB1060942A (en) * 1964-01-27 1967-03-08 Varian Associates Cathode heater assembly and method of making same
US3328201A (en) * 1964-04-27 1967-06-27 Rca Corp Heater for electron tubes
US3401297A (en) * 1965-08-23 1968-09-10 Varian Associates Thermionic cathodes for electron discharge devices with improved refractory metal heater wires

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
DE2316565A1 (en) 1973-10-18
CA1014805A (en) 1977-08-02
JPS5331591B2 (en) 1978-09-04
NL7304824A (en) 1973-10-09
FR2179251B1 (en) 1978-05-26
FR2179251A1 (en) 1973-11-16
DE2316565B2 (en) 1976-01-15
JPS4917960A (en) 1974-02-16
US3852105A (en) 1974-12-03

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19930403