DK0425325T3 - Macro crystals of alpha alumina in the form of slices and process for their preparation - Google Patents

Macro crystals of alpha alumina in the form of slices and process for their preparation

Info

Publication number
DK0425325T3
DK0425325T3 DK90402599.6T DK90402599T DK0425325T3 DK 0425325 T3 DK0425325 T3 DK 0425325T3 DK 90402599 T DK90402599 T DK 90402599T DK 0425325 T3 DK0425325 T3 DK 0425325T3
Authority
DK
Denmark
Prior art keywords
alpha alumina
slices
preparation
alumina
macrocrystals
Prior art date
Application number
DK90402599.6T
Other languages
Danish (da)
Inventor
Roland Bachelard
Annick Faure
Original Assignee
Atochem Elf Sa
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 Atochem Elf Sa filed Critical Atochem Elf Sa
Application granted granted Critical
Publication of DK0425325T3 publication Critical patent/DK0425325T3/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10—Inorganic compounds or compositions
    • C30B29/16—Oxides
    • C30B29/20—Aluminium oxides
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B9/00—Single-crystal growth from melt solutions using molten solvents
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
    • C01P2004/22—Particle morphology extending in two dimensions, e.g. plate-like with a polygonal circumferential shape
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/54—Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Paper (AREA)

Abstract

Macrocrystals of alpha alumina in the form of monocrystalline hexagonal platelets. The invention also relates to a process for the manufacture of these macrocrystals by calcination of alumina, for example transition alumina, and in the presence of a fluorine-containing flux, at a relatively low temperature. The macrocrystals of alpha alumina can be employed as reinforcing materials.
DK90402599.6T 1989-09-21 1990-09-20 Macro crystals of alpha alumina in the form of slices and process for their preparation DK0425325T3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8912402A FR2652075B1 (en) 1989-09-21 1989-09-21 ALPHA ALUMINA MACROCRYSTALS IN THE FORM OF PLATES AND PROCESS FOR OBTAINING SAME.

Publications (1)

Publication Number Publication Date
DK0425325T3 true DK0425325T3 (en) 1994-02-14

Family

ID=9385725

Family Applications (1)

Application Number Title Priority Date Filing Date
DK90402599.6T DK0425325T3 (en) 1989-09-21 1990-09-20 Macro crystals of alpha alumina in the form of slices and process for their preparation

Country Status (15)

Country Link
EP (1) EP0425325B1 (en)
JP (1) JP2564205B2 (en)
KR (1) KR950003419B1 (en)
CN (1) CN1047576C (en)
AT (1) ATE98304T1 (en)
AU (1) AU627933B2 (en)
CA (1) CA2025037A1 (en)
DD (1) DD295885A5 (en)
DE (1) DE69005077T2 (en)
DK (1) DK0425325T3 (en)
ES (1) ES2060108T3 (en)
FR (1) FR2652075B1 (en)
IE (1) IE903320A1 (en)
IL (1) IL95719A0 (en)
NO (1) NO903690L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9718726B2 (en) 2012-11-07 2017-08-01 Asahi Glass Company, Limited Glass ceramic substrate and portable electronic device housing using the substrate

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU639326B2 (en) * 1990-05-23 1993-07-22 Atochem Ceramic preforms comprising monocrystalline hexagonal platelets of alpha-alumina, their production and applications thereof
DE69324581T2 (en) * 1992-06-02 1999-11-18 Sumitomo Chemical Co., Ltd. ALPHA ALUMINUM OXIDE
CA2099734A1 (en) * 1992-07-01 1994-01-02 Akihiko Takahashi Process for preparing polyhedral alpha-alumina particles
CA2136582A1 (en) 1993-11-25 1995-05-26 Masahide Mohri Method for producing alpha-alumina powder
FR2715169B1 (en) * 1994-01-14 1996-04-05 Atochem Elf Sa Macrocrystals containing aluminum nitride in the form of platelets, their preparation process and their uses.
JP3416855B2 (en) * 1994-04-15 2003-06-16 株式会社フジミインコーポレーテッド Polishing composition and polishing method
AU699077B2 (en) * 1995-02-21 1998-11-19 Sumitomo Chemical Company, Limited Alpha-alumina and method for producing the same
FR2734812B1 (en) * 1995-05-31 1997-07-04 Atochem Elf Sa PROCESS FOR THE PREPARATION OF CERAMIC DRILL PARTS COMPRISING SINGLE-CRYSTAL ALPHA ALUMINUM WAFERS
TW460548B (en) * 1998-12-23 2001-10-21 Merck Patent Gmbh Pigment mixture
JP4270848B2 (en) * 2002-11-08 2009-06-03 昭和電工株式会社 Alumina particles and method for producing the same
AU2003900030A0 (en) 2003-01-07 2003-01-23 Advanced Nano Technologies Pty Ltd Process for the production of ultrafine plate-like alumina particles
KR100555751B1 (en) 2004-01-05 2006-03-03 삼성전자주식회사 Process cartridge for image forming apparatus
JP4841851B2 (en) * 2005-03-02 2011-12-21 電気化学工業株式会社 Alumina and production method thereof
CN100348494C (en) * 2005-08-26 2007-11-14 郑州大学 High dispersibility alpha-Al2O3 nanometer powder preparation method
JP5211467B2 (en) * 2006-11-22 2013-06-12 日本軽金属株式会社 Method for producing polyhedral α-alumina
KR100803049B1 (en) * 2007-08-31 2008-02-22 (주)제이피에스 마이크로텍 Manufacture method of flake aluminum oxide using microwave
DE102009014638A1 (en) 2009-03-24 2010-09-30 Clariant International Ltd. Laminates containing hard, plate-shaped minerals
JPWO2013133300A1 (en) * 2012-03-09 2015-07-30 旭硝子株式会社 Glass ceramic body, laminate, portable electronic device casing, and portable electronic device
WO2014051091A1 (en) * 2012-09-28 2014-04-03 Dic株式会社 α-ALUMINA MICROPARTICLES AND METHOD FOR PRODUCING SAME
CN102924092A (en) * 2012-10-24 2013-02-13 江苏大学 Low-cost and pollution-free preparation method for highly dispersed flaky alumina
JP6646864B2 (en) * 2015-06-01 2020-02-14 Dic株式会社 Method for producing plate-like alumina particles
CN104925843A (en) * 2015-06-03 2015-09-23 清华大学 Method for preparing laminar alpha-Al2O3 pearlescent pigment base material by use of compound aluminum salt
CN108560052B (en) * 2018-04-26 2020-05-01 闽江学院 Preparation method and application of monocrystal hexagonal alumina
CN113329972B (en) * 2019-01-25 2022-09-20 Dic株式会社 Plate-like alumina particles and method for producing plate-like alumina particles
JP6708281B2 (en) * 2019-03-27 2020-06-10 Dic株式会社 Plate-shaped alumina particles
JP7524945B2 (en) 2019-10-09 2024-07-30 Dic株式会社 Plate-like alumina particles and method for producing plate-like alumina particles
WO2021068125A1 (en) * 2019-10-09 2021-04-15 Dic Corporation Plate-like alumina particle and method for manufacturing plate-like alumina particle
CN110938862A (en) * 2019-12-23 2020-03-31 苏州纳迪微电子有限公司 High-purity monocrystalline corundum powder and preparation method thereof
CN114057505B (en) * 2021-12-13 2023-02-28 西安邮电大学 Preparation method of porous flaky alumina framework

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB935390A (en) * 1960-12-20 1963-08-28 Gen Electric Co Ltd Improvements in or relating to the manufacture of corundum crystals
JPS5215498A (en) * 1975-07-28 1977-02-05 Showa Denko Kk Process for production of granular corrundum
DE2623482C2 (en) * 1976-05-26 1985-06-27 Alcoa Chemie GmbH, 6700 Ludwigshafen Process for the production of a crystalline aluminum oxide for polishing, lapping and grinding media
DE2850064B1 (en) * 1978-11-18 1980-05-08 Giulini Chemie Hexagonal tabular alpha alumina single crystals and process for their manufacture
JPS5819640A (en) * 1981-07-27 1983-02-04 Matsushita Electric Ind Co Ltd Temperature control device of air conditioners etc.
JPS6033763A (en) * 1983-08-05 1985-02-21 Nippon Telegr & Teleph Corp <Ntt> Speed selecting communication system
JPS6054916A (en) * 1983-09-06 1985-03-29 坂東　尚周 Hexagonal flake a-al203 particle and manufacture
JPS6433055A (en) * 1987-07-27 1989-02-02 Sumitomo Cement Co Sintered body of alumina having high strength and its production
US5009676A (en) * 1989-04-28 1991-04-23 Norton Company Sintered sol gel alumina abrasive filaments
JP3207739B2 (en) * 1996-01-19 2001-09-10 松下電器産業株式会社 Image playback device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9718726B2 (en) 2012-11-07 2017-08-01 Asahi Glass Company, Limited Glass ceramic substrate and portable electronic device housing using the substrate

Also Published As

Publication number Publication date
CA2025037A1 (en) 1991-03-22
ES2060108T3 (en) 1994-11-16
DE69005077T2 (en) 1994-05-26
AU627933B2 (en) 1992-09-03
CN1050366A (en) 1991-04-03
DE69005077D1 (en) 1994-01-20
AU6269790A (en) 1991-04-11
JP2564205B2 (en) 1996-12-18
IL95719A0 (en) 1991-06-30
JPH03131517A (en) 1991-06-05
NO903690L (en) 1991-03-22
KR910006145A (en) 1991-04-27
IE903320A1 (en) 1991-04-10
EP0425325B1 (en) 1993-12-08
KR950003419B1 (en) 1995-04-12
NO903690D0 (en) 1990-08-22
FR2652075B1 (en) 1991-12-06
EP0425325A1 (en) 1991-05-02
DD295885A5 (en) 1991-11-14
ATE98304T1 (en) 1993-12-15
CN1047576C (en) 1999-12-22
FR2652075A1 (en) 1991-03-22

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