GB1196899A - Seals between Sintered Ceramic Parts - Google Patents

Seals between Sintered Ceramic Parts

Info

Publication number
GB1196899A
GB1196899A GB2003169A GB2003169A GB1196899A GB 1196899 A GB1196899 A GB 1196899A GB 2003169 A GB2003169 A GB 2003169A GB 2003169 A GB2003169 A GB 2003169A GB 1196899 A GB1196899 A GB 1196899A
Authority
GB
United Kingdom
Prior art keywords
envelope
plugs
density
powder
firing
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
GB2003169A
Inventor
David Tom Evans
Michael Albert Parrott
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.)
Thorn Lighting Ltd
Original Assignee
Thorn Lighting 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 Thorn Lighting Ltd filed Critical Thorn Lighting Ltd
Priority to GB2003169A priority Critical patent/GB1196899A/en
Priority to CA080068A priority patent/CA920777A/en
Priority to DE19702017854 priority patent/DE2017854C3/en
Priority to NL7005546A priority patent/NL143203B/en
Publication of GB1196899A publication Critical patent/GB1196899A/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
    • C04B37/001—Joining burned ceramic articles with other burned ceramic articles or other articles by heating directly with other burned ceramic articles
    • 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
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/24—Vacuum-tight joints between parts of vessel between insulating parts of vessel
    • 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
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • C04B2235/9615—Linear firing shrinkage
    • 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
    • C04B2237/34—Oxidic
    • C04B2237/343—Alumina or aluminates
    • 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
    • C04B2237/84—Joining of a first substrate with a second substrate at least partially inside the first substrate, where the bonding area is at the inside of the first substrate, e.g. one tube inside another tube
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0037—Solid sealing members other than lamp bases
    • H01J2893/0038—Direct connection between two insulating elements, in particular via glass material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

1,196,899. Joining ceramic articles; shaped alumina articles. THORN LIGHTING Ltd. 18 April, 1969, No. 20031/69. Headings C1A and C1J. The tubular envelope of a discharge lamp is made from a sub-micron, ball-milled alumina powder, containing a small amount of magnesia, by isostatic pressing at 5 tons per square inch and firing at 1100‹ C. to a density of 1À84 gm. cm<SP>-3</SP>. Some of the same ball-milled magnesiacontaining alumina powder is spray dried from an aqueous suspension, which can contain an organic binder, to produce spheroidal particles having a higher bulk density than the ballmilled powder. End plugs for the envelope are made by compacting the spray-dried powder at 5 tons per square inch and firing the compacts at 1100‹ C. to a density of 2À15 gm. cm<SP>-3</SP>. The plugs are machined, if necessary, to fit tightly inside the envelope and the envelope and plug assembly is sintered in hydrogen at 1800‹ C. to a density of 3À95 gm. cm<SP>-3</SP>. The envelope shrinks more than the plugs to achieve a hermetic seal with grain growth across the interface. The plugs may have one or more holes for electrodes and/or exhaust tubes. The differential shrinkage can be controlled by using materials of different compositions; by pressing the plugs at a higher pressure than the envelope or by partially sintering the compacted plugs before machining.
GB2003169A 1969-04-18 1969-04-18 Seals between Sintered Ceramic Parts Expired GB1196899A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2003169A GB1196899A (en) 1969-04-18 1969-04-18 Seals between Sintered Ceramic Parts
CA080068A CA920777A (en) 1969-04-18 1970-04-14 Seals between sintered ceramic parts
DE19702017854 DE2017854C3 (en) 1969-04-18 1970-04-14 Process for the production of temperature-resistant, hermetically sealed seals for pistons made of sintered ceramic
NL7005546A NL143203B (en) 1969-04-18 1970-04-17 METHOD OF MANUFACTURING A SINTERED CERAMIC OBJECT.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2003169A GB1196899A (en) 1969-04-18 1969-04-18 Seals between Sintered Ceramic Parts

Publications (1)

Publication Number Publication Date
GB1196899A true GB1196899A (en) 1970-07-01

Family

ID=10139217

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2003169A Expired GB1196899A (en) 1969-04-18 1969-04-18 Seals between Sintered Ceramic Parts

Country Status (3)

Country Link
CA (1) CA920777A (en)
GB (1) GB1196899A (en)
NL (1) NL143203B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0136505A2 (en) * 1983-09-06 1985-04-10 GTE Laboratories Incorporated Direct seal between niobium and ceramics
FR2623334A1 (en) * 1987-10-06 1989-05-19 Lilliwyte Sa COMPOSITE MANUFACTURE PRODUCT IN BETA-ALUMINUM

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011993A1 (en) * 1978-12-01 1980-06-11 Thorn Emi Plc Electric discharge lamps

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0136505A2 (en) * 1983-09-06 1985-04-10 GTE Laboratories Incorporated Direct seal between niobium and ceramics
EP0136505A3 (en) * 1983-09-06 1986-01-15 Gte Laboratories Incorporated Direct seal between niobium and ceramics
FR2623334A1 (en) * 1987-10-06 1989-05-19 Lilliwyte Sa COMPOSITE MANUFACTURE PRODUCT IN BETA-ALUMINUM

Also Published As

Publication number Publication date
DE2017854A1 (en) 1970-11-19
NL143203B (en) 1974-09-16
DE2017854B2 (en) 1973-12-20
CA920777A (en) 1973-02-13
NL7005546A (en) 1970-10-20

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee