NL143203B - METHOD OF MANUFACTURING A SINTERED CERAMIC OBJECT. - Google Patents

METHOD OF MANUFACTURING A SINTERED CERAMIC OBJECT.

Info

Publication number
NL143203B
NL143203B NL7005546A NL7005546A NL143203B NL 143203 B NL143203 B NL 143203B NL 7005546 A NL7005546 A NL 7005546A NL 7005546 A NL7005546 A NL 7005546A NL 143203 B NL143203 B NL 143203B
Authority
NL
Netherlands
Prior art keywords
envelope
plugs
density
powder
firing
Prior art date
Application number
NL7005546A
Other languages
Dutch (nl)
Other versions
NL7005546A (en
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
Publication of NL7005546A publication Critical patent/NL7005546A/xx
Publication of NL143203B publication Critical patent/NL143203B/en

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.
NL7005546A 1969-04-18 1970-04-17 METHOD OF MANUFACTURING A SINTERED CERAMIC OBJECT. NL143203B (en)

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 (2)

Publication Number Publication Date
NL7005546A NL7005546A (en) 1970-10-20
NL143203B true NL143203B (en) 1974-09-16

Family

ID=10139217

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7005546A NL143203B (en) 1969-04-18 1970-04-17 METHOD OF MANUFACTURING A SINTERED CERAMIC OBJECT.

Country Status (3)

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

Families Citing this family (3)

* 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
US4545799A (en) * 1983-09-06 1985-10-08 Gte Laboratories Incorporated Method of making direct seal between niobium and ceramics
GB8723408D0 (en) * 1987-10-06 1987-11-11 Lilliwyte Sa Electrolyte separator

Also Published As

Publication number Publication date
NL7005546A (en) 1970-10-20
DE2017854A1 (en) 1970-11-19
GB1196899A (en) 1970-07-01
DE2017854B2 (en) 1973-12-20
CA920777A (en) 1973-02-13

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Legal Events

Date Code Title Description
V1 Lapsed because of non-payment of the annual fee
NL80 Abbreviated name of patent owner mentioned of already nullified patent

Owner name: THORN