GB1443741A - Process for the manufacture of translucent polycrystalline alumina bodies - Google Patents
Process for the manufacture of translucent polycrystalline alumina bodiesInfo
- 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
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title abstract 3
- 238000004519 manufacturing process Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 abstract 6
- 239000004014 plasticizer Substances 0.000 abstract 6
- 238000010438 heat treatment Methods 0.000 abstract 5
- 239000002184 metal Substances 0.000 abstract 2
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 235000013871 bee wax Nutrition 0.000 abstract 1
- 239000012166 beeswax Substances 0.000 abstract 1
- 235000014113 dietary fatty acids Nutrition 0.000 abstract 1
- 229930195729 fatty acid Natural products 0.000 abstract 1
- 239000000194 fatty acid Substances 0.000 abstract 1
- 150000004665 fatty acids Chemical class 0.000 abstract 1
- 239000011261 inert gas Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 abstract 1
- 239000012188 paraffin wax Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
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.
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)
| 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 |
| 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 |
-
1973
- 1973-07-03 GB GB3168073A patent/GB1443741A/en not_active Expired
Cited By (9)
| 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 |
| 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 |