GB809281A - Improvements in and relating to seals - Google Patents

Improvements in and relating to seals

Info

Publication number
GB809281A
GB809281A GB26532/45A GB2653245A GB809281A GB 809281 A GB809281 A GB 809281A GB 26532/45 A GB26532/45 A GB 26532/45A GB 2653245 A GB2653245 A GB 2653245A GB 809281 A GB809281 A GB 809281A
Authority
GB
United Kingdom
Prior art keywords
vapour
product
graphite
polytetrafluorethylene
heating
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
GB26532/45A
Inventor
Bernard William Bradford
Wilfred Jesse Skinner
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB26532/45A priority Critical patent/GB809281A/en
Publication of GB809281A publication Critical patent/GB809281A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/24—Promoting flow of the coolant
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/02—Ingredients treated with inorganic substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/20—Packing materials therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

Graphite is contacted with uranium hexafluoride vapour to form a product which is admixed with polytetrafluorethylene to produce a moulding composition from which seals resistant to UF6 vapour under conditions of rubbing friction may be made. Granular graphite is degassed by heating in an evacuated vessel at 100 DEG C. and cooled. UF6 vapour is introduced and left in contact for 24 hours, and the product is ground. Massive or lumpy graphite requires several days' exposure to UF6 vapour.ALSO:A mouldable composition comprises an admixture of polytetrafluorethylene and the product of treating graphitic carbon with uranium hexafluoride vapour (see Group III). The ground graphite product and an equal weight of ground polytetrafluorethylene are intimately mixed, first by hand, and then by mill. The mixture is moulded at 2 1/2 tons per square inch, and the strength of the mouldings is improved by heating at 380-420 DEG C., preferably 400 DEG C. for 3-4 hours; this heating may be effected in the mould after pressing. Seals resistant to UF6 vapour under conditions of rubbing friction may be made from the composition.
GB26532/45A 1945-10-10 1945-10-10 Improvements in and relating to seals Expired GB809281A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB26532/45A GB809281A (en) 1945-10-10 1945-10-10 Improvements in and relating to seals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26532/45A GB809281A (en) 1945-10-10 1945-10-10 Improvements in and relating to seals

Publications (1)

Publication Number Publication Date
GB809281A true GB809281A (en) 1959-02-18

Family

ID=10245118

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26532/45A Expired GB809281A (en) 1945-10-10 1945-10-10 Improvements in and relating to seals

Country Status (1)

Country Link
GB (1) GB809281A (en)

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