GB646846A - Improved method of providing an electric insulator with a resistance coating - Google Patents

Improved method of providing an electric insulator with a resistance coating

Info

Publication number
GB646846A
GB646846A GB2584/48A GB258448A GB646846A GB 646846 A GB646846 A GB 646846A GB 2584/48 A GB2584/48 A GB 2584/48A GB 258448 A GB258448 A GB 258448A GB 646846 A GB646846 A GB 646846A
Authority
GB
United Kingdom
Prior art keywords
produce
lead oxide
coating
glass
jan
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
GB2584/48A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB646846A publication Critical patent/GB646846A/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
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/06—Vessels or containers specially adapted for operation at high tension, e.g. by improved potential distribution over surface of vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/08—Vessels; Containers; Shields associated therewith; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Bodies (AREA)

Abstract

646,846. Resistance coatings and deposits; insulators. BRITISH THOMSON-HOUSTON CO., Ltd. Jan. 28, 1948, No. 2584. Convention date, Jan. 29, 1947. [Classes 36 and 37] [Also in Groups II, XXIII, and XL (a)] A non-conductive base, for example a glass or ceramic tube, is provided with one or more surface layers of glass containing reduced lead oxide and constituting a resistance element of high ohmic value. In an X-ray tube two superimposed layers 2 on the inner surface of the tube 1 produce the required surface conductivity ensuring uniform potential distribution during operation. The coating process consists in: (1) preparing powdered glass of lead oxide content between 60 and 85 per cent; (2) applying as a suspension in, for example, a solution of nitrocellulose in amyl acetate; (3) baking the first coating at 630‹ C. for half-an-hour in air to produce a shiny glaze; (4) baking the second coating at 590‹ C., i.e. below fusion, in air for half an hour to produce an unglazed sintered layer of matt appearance; (5) heat-treating in the presence of a reducing gas, for example, hydrogen at 350 to 400‹ C. for 10 to 16 hours. It is stated that the lead oxide reduction effected involves particularly the outer layer which assumes a black appearance. Surface resistivity for tubes treated as above is given as 1000 to 4000 megohms per square of surface. Specification 647,233, [Group XL (a)], is referred to.
GB2584/48A 1947-01-29 1948-01-28 Improved method of providing an electric insulator with a resistance coating Expired GB646846A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US646846XA 1947-01-29 1947-01-29

Publications (1)

Publication Number Publication Date
GB646846A true GB646846A (en) 1950-11-29

Family

ID=22057618

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2584/48A Expired GB646846A (en) 1947-01-29 1948-01-28 Improved method of providing an electric insulator with a resistance coating

Country Status (3)

Country Link
BE (1) BE481748A (en)
FR (1) FR960386A (en)
GB (1) GB646846A (en)

Also Published As

Publication number Publication date
FR960386A (en) 1950-04-18
BE481748A (en)

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