GB579515A - Improvements in or relating to vacuum tight seals - Google Patents

Improvements in or relating to vacuum tight seals

Info

Publication number
GB579515A
GB579515A GB7931/44A GB793144A GB579515A GB 579515 A GB579515 A GB 579515A GB 7931/44 A GB7931/44 A GB 7931/44A GB 793144 A GB793144 A GB 793144A GB 579515 A GB579515 A GB 579515A
Authority
GB
United Kingdom
Prior art keywords
per cent
silica
zircon
expansion
employed
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
GB7931/44A
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.)
Westinghouse Electric International Co
Original Assignee
Westinghouse Electric International Co
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 Westinghouse Electric International Co filed Critical Westinghouse Electric International Co
Publication of GB579515A publication Critical patent/GB579515A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
    • C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
    • C04B37/023—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used
    • C04B37/025—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used consisting of glass or ceramic material
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6562—Heating rate
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
    • C04B2237/10—Glass interlayers, e.g. frit or flux
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/32—Ceramic
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/40—Metallic
    • C04B2237/405—Iron metal group, e.g. Co or Ni
    • 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
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/62—Forming laminates or joined articles comprising holes, channels or other types of openings

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Insulators (AREA)

Abstract

In the manufacture of electrical apparatus comprising a cylindrical porcelain bushing connected to a closely-surrounding metal collar by a ring of glass which fuses during firing to form a vacuum-tight seal, a porcelain is employed which has no abrupt variation in its rate of expansion between room temperature and 1100 DEG C. and which is formed from a mixture containing substantially 1.58 per cent Na2O, 3.35 per cent K2O, 0.09 per cent CaO, 0.12 per cent MgO, 0.71 per cent TiO2, 0.47 per cent Fe2O3, 24.80 per cent Al2O3, 10-41 per cent zircon, cordierite, fused silica, or mulliteforming materials, and the remainder silica. The mixture is fired at approximately 1225 DEG C. Preferably, all the free silica is replaced as by zircon, a satisfactory final mixture including 12.57 per cent ZrO2 and 56.31 per cent SiO2. The coefficient of expansion is close to that of the nickel-cobalt-iron alloy of which the collar is made and to a borosilicate glass employed for the seal.
GB7931/44A 1943-05-08 1944-04-27 Improvements in or relating to vacuum tight seals Expired GB579515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US579515XA 1943-05-08 1943-05-08

Publications (1)

Publication Number Publication Date
GB579515A true GB579515A (en) 1946-08-07

Family

ID=22013737

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7931/44A Expired GB579515A (en) 1943-05-08 1944-04-27 Improvements in or relating to vacuum tight seals

Country Status (1)

Country Link
GB (1) GB579515A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995032163A1 (en) * 1994-05-25 1995-11-30 Office National D'etudes Et De Recherches Aerospatiales Process and composition for assembling part made of ceramic and refractory alloy
WO2014139864A1 (en) * 2013-03-12 2014-09-18 Hug Engineering Ag Method for producing a moulded article and moulded article
EP3098280A1 (en) * 2015-05-29 2016-11-30 Palo Alto Research Center, Incorporated High temperature seal compositions and methods of using same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995032163A1 (en) * 1994-05-25 1995-11-30 Office National D'etudes Et De Recherches Aerospatiales Process and composition for assembling part made of ceramic and refractory alloy
FR2720392A1 (en) * 1994-05-25 1995-12-01 Onera (Off Nat Aerospatiale) Process and composition for assembling ceramic and refractory alloy parts
WO2014139864A1 (en) * 2013-03-12 2014-09-18 Hug Engineering Ag Method for producing a moulded article and moulded article
US10233124B2 (en) 2013-03-12 2019-03-19 Hug Engineering Ag Method for producing a molded article and molded article
EP3789363A1 (en) * 2013-03-12 2021-03-10 Hug Engineering AG Method of producing a moulding
EP3098280A1 (en) * 2015-05-29 2016-11-30 Palo Alto Research Center, Incorporated High temperature seal compositions and methods of using same
US9976058B2 (en) 2015-05-29 2018-05-22 Palo Alto Research Center Incorporated High temperature seal compositions and methods of using same

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