GB1443741A - Process for the manufacture of translucent polycrystalline alumina bodies - Google Patents

Process for the manufacture of translucent polycrystalline alumina bodies

Info

Publication number
GB1443741A
GB1443741A GB3168073A GB3168073A GB1443741A GB 1443741 A GB1443741 A GB 1443741A GB 3168073 A GB3168073 A GB 3168073A GB 3168073 A GB3168073 A GB 3168073A GB 1443741 A GB1443741 A GB 1443741A
Authority
GB
United Kingdom
Prior art keywords
plasticizer
heating
bodies
stage
supported
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
GB3168073A
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.)
Nikex Nehezipari Kulkereskedelmi Vallalat
Original Assignee
Nikex Nehezipari Kulkereskedelmi Vallalat
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 Nikex Nehezipari Kulkereskedelmi Vallalat filed Critical Nikex Nehezipari Kulkereskedelmi Vallalat
Priority to GB3168073A priority Critical patent/GB1443741A/en
Publication of GB1443741A publication Critical patent/GB1443741A/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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/111—Fine ceramics
    • C04B35/115—Translucent or transparent products
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • 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
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
    • H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

1443741 Shaped bodies of alumina NIKEX NEHEZIPARI KULKERESKEDELMI VALLALAT 3 July 1973 31680/73 Heading C1A [Also in Divisions B5 and H1] Tubular-shaped, polycrystalline, translucent, dense alumina bodies are formed from finelydivided Al 2 O 3 and an organic plasticizer by cold-flow pressing, heating first to remove the plasticizer and then separately to sinter. The shape of the body may be mechanically altered before heating. The formed body may be supported during the first stage of heating by, e.g. Al 2 O 3 powder which also absorbs the plasticizer; the heating may be at a rate of 5-10‹ C. per hour until the plasticizer is removed and then to a maximum of 1200- 1400‹ C. During the second stage of heating, i.e. sintering the body may be supported in a vertical position on a smooth Al 2 O 3 mandrel and surrounded by an Mo sheath and heated to over 1800‹ C. for 5-10 minutes in an inert gas, a reducing atmosphere, a plasma or a vacuum. The material used may be 90% pure α-Al 2 O 3 , up to 5% γ-Al 2 O 3 , up to 1% plasticizer and a metal additive, e.g. Mg(NO 3 ) 2 . The plasticizer may be paraffin and a fatty acid, e.g. oleic or beeswax and may be dissolved in a solvent to incorporate it in the Al 2 O 3 . The products are used for metal vapour lamp bodies.
GB3168073A 1973-07-03 1973-07-03 Process for the manufacture of translucent polycrystalline alumina bodies Expired GB1443741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3168073A GB1443741A (en) 1973-07-03 1973-07-03 Process for the manufacture of translucent polycrystalline alumina bodies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3168073A GB1443741A (en) 1973-07-03 1973-07-03 Process for the manufacture of translucent polycrystalline alumina bodies

Publications (1)

Publication Number Publication Date
GB1443741A true GB1443741A (en) 1976-07-21

Family

ID=10326800

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3168073A Expired GB1443741A (en) 1973-07-03 1973-07-03 Process for the manufacture of translucent polycrystalline alumina bodies

Country Status (1)

Country Link
GB (1) GB1443741A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2932789A1 (en) * 1978-08-14 1980-03-06 Ngk Insulators Ltd POLYCRYSTALLINE TRANSPARENT SPINEL INTERMEDIATORS AND METHOD FOR THE PRODUCTION THEREOF
US4214666A (en) * 1977-12-02 1980-07-29 Ngk Insulators, Ltd. Tubular discharge envelope composed of a polycrystalline transparent alumina and a high-pressure vapor discharge lamp using the same
US4222978A (en) * 1978-05-12 1980-09-16 Ngk Insulators, Ltd. Method for producing polycrystalline translucent alumina having an excellent in-line transmission
FR2530999A1 (en) * 1982-07-30 1984-02-03 Ceraver METHOD FOR MANUFACTURING A SPIRAL TUBULAR ENCLOSURE, DEVICE FOR MANUFACTURING ACCORDING TO SAID METHOD AND APPLICATIONS THEREOF
EP0111079A2 (en) * 1982-12-07 1984-06-20 Hutschenreuther AG Method of preparing ceramic compositions to be injection-moulded
US4762655A (en) * 1985-11-27 1988-08-09 Gte Laboratories Incorporated Method of sintering translucent alumina
US4948538A (en) * 1988-10-11 1990-08-14 Gte Laboratories Incorporated Method of making translucent alumina articles

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214666A (en) * 1977-12-02 1980-07-29 Ngk Insulators, Ltd. Tubular discharge envelope composed of a polycrystalline transparent alumina and a high-pressure vapor discharge lamp using the same
US4222978A (en) * 1978-05-12 1980-09-16 Ngk Insulators, Ltd. Method for producing polycrystalline translucent alumina having an excellent in-line transmission
DE2932789A1 (en) * 1978-08-14 1980-03-06 Ngk Insulators Ltd POLYCRYSTALLINE TRANSPARENT SPINEL INTERMEDIATORS AND METHOD FOR THE PRODUCTION THEREOF
DE2932789C2 (en) 1978-08-14 1982-07-15 NGK Insulators Ltd., Nagoya, Aichi Polycrystalline transparent spinel sintered bodies and process for their manufacture
FR2530999A1 (en) * 1982-07-30 1984-02-03 Ceraver METHOD FOR MANUFACTURING A SPIRAL TUBULAR ENCLOSURE, DEVICE FOR MANUFACTURING ACCORDING TO SAID METHOD AND APPLICATIONS THEREOF
EP0100968A1 (en) * 1982-07-30 1984-02-22 CERAVER Société anonyme dite: Method of producing a tubular helical enclosure, apparatus for production by this method, and its applications
EP0111079A2 (en) * 1982-12-07 1984-06-20 Hutschenreuther AG Method of preparing ceramic compositions to be injection-moulded
EP0111079A3 (en) * 1982-12-07 1986-04-23 Hutschenreuther Ag Method of preparing ceramic compositions to be injection-moulded
US4762655A (en) * 1985-11-27 1988-08-09 Gte Laboratories Incorporated Method of sintering translucent alumina
US4948538A (en) * 1988-10-11 1990-08-14 Gte Laboratories Incorporated Method of making translucent alumina articles

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Legal Events

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