[go: up one dir, main page]

IL95719A0 - Microcrystals of alpha-alumina in the form of platelets and their production - Google Patents

Microcrystals of alpha-alumina in the form of platelets and their production

Info

Publication number
IL95719A0
IL95719A0 IL95719A IL9571990A IL95719A0 IL 95719 A0 IL95719 A0 IL 95719A0 IL 95719 A IL95719 A IL 95719A IL 9571990 A IL9571990 A IL 9571990A IL 95719 A0 IL95719 A0 IL 95719A0
Authority
IL
Israel
Prior art keywords
alumina
alpha
platelets
microcrystals
production
Prior art date
Application number
IL95719A
Original Assignee
Atochem
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 filed Critical Atochem
Publication of IL95719A0 publication Critical patent/IL95719A0/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.
IL95719A 1989-09-21 1990-09-18 Microcrystals of alpha-alumina in the form of platelets and their production IL95719A0 (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
IL95719A0 true IL95719A0 (en) 1991-06-30

Family

ID=9385725

Family Applications (1)

Application Number Title Priority Date Filing Date
IL95719A IL95719A0 (en) 1989-09-21 1990-09-18 Microcrystals of alpha-alumina in the form of platelets and their production

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)

Families Citing this family (32)

* 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
CA2137247A1 (en) * 1992-06-02 1993-12-09 Masahide Mohri Process for producing .alpha.-alumina
CA2099734A1 (en) * 1992-07-01 1994-01-02 Akihiko Takahashi Process for preparing polyhedral alpha-alumina particles
JP3744010B2 (en) * 1993-06-30 2006-02-08 住友化学株式会社 Method for producing α-alumina powder
IL111763A (en) 1993-11-25 1998-08-16 Sumitomo Chemical Co 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
RU2171226C1 (en) * 1999-12-28 2001-07-27 Общество с ограниченной ответственностью "Геонанотехнология" Alumina production process
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 of Image Forming Device
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 Method for producing 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
CN104718162B (en) * 2012-09-28 2017-11-21 Dic株式会社 α-alumina fine particles and production method thereof
CN102924092A (en) * 2012-10-24 2013-02-13 江苏大学 Low-cost and pollution-free preparation method for highly dispersed flaky alumina
WO2014073604A1 (en) 2012-11-07 2014-05-15 旭硝子株式会社 Glass ceramic substrate and housing for portable electronic equipment using substrate
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 flake-shaped α-Al2O3 pearlescent pigment base material by using composite aluminum salt
CN108560052B (en) * 2018-04-26 2020-05-01 闽江学院 Preparation method and application of monocrystal hexagonal alumina
WO2020150985A1 (en) * 2019-01-25 2020-07-30 Dic Corporation Tabular alumina particle and method for manufacturing tabular alumina particle
JP6708281B2 (en) * 2019-03-27 2020-06-10 Dic株式会社 Plate-shaped alumina particles
US12459830B2 (en) * 2019-10-09 2025-11-04 Dic Corporation Plate-like alumina particle and method for manufacturing plate-like alumina particle
CN114502666B (en) 2019-10-09 2024-02-13 Dic株式会社 Flaky alumina particles and methods of manufacturing flaky alumina particles
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

Also Published As

Publication number Publication date
AU6269790A (en) 1991-04-11
DD295885A5 (en) 1991-11-14
FR2652075B1 (en) 1991-12-06
FR2652075A1 (en) 1991-03-22
NO903690D0 (en) 1990-08-22
CN1047576C (en) 1999-12-22
JP2564205B2 (en) 1996-12-18
AU627933B2 (en) 1992-09-03
CA2025037A1 (en) 1991-03-22
IE903320A1 (en) 1991-04-10
KR950003419B1 (en) 1995-04-12
ES2060108T3 (en) 1994-11-16
JPH03131517A (en) 1991-06-05
KR910006145A (en) 1991-04-27
DE69005077D1 (en) 1994-01-20
NO903690L (en) 1991-03-22
DE69005077T2 (en) 1994-05-26
CN1050366A (en) 1991-04-03
EP0425325B1 (en) 1993-12-08
EP0425325A1 (en) 1991-05-02
ATE98304T1 (en) 1993-12-15
DK0425325T3 (en) 1994-02-14

Similar Documents

Publication Publication Date Title
IL95719A0 (en) Microcrystals of alpha-alumina in the form of platelets and their production
JPS6465018A (en) Ceric oxide having novel morphological characteristics and manufacture
DK548087D0 (en) Synthetic, crystalline, porous material containing silicon, titanium and gallium oxides
FR2618166B1 (en) PROCESS FOR THE MANUFACTURE OF SPECIAL ALUMIN FROM THE DUST PRODUCED DURING THE CALCINATION OF METALLURGICAL ALUMIN.
ATE26819T1 (en) PROCESS FOR THE PRODUCTION OF CRYSTALLINE ALUMINUM.
AU7620291A (en) Ceramic preforms comprising monocrystalline hexagonal platelets of alpha-alumina, their production and applications thereof
EP0157503A3 (en) Production of low silica content, high purity alumina
FI891181A7 (en) High purity method for the preparation of 4,6-diamino-1,3-benzenediol
ATE85034T1 (en) SYNTHETIC, CRYSTALLINE, POROUS, SILICA, TITANIUM OXIDE AND ALUMINUM MATERIAL.
DK609186A (en) SYNTHETIC, CRYSTALLIC AND POROEST MATERIALS CONTAINING SILICON OXIDE, TITANOXIDE AND IRON OXIDE AND PROCEDURES FOR THE PRODUCTION OF IT
EP0202551A3 (en) Siliceous raw materials for ceramics, process for their production and their use
Lee Growth of ZrO sub 2 single crystal by the flux method
Wunch et al. Formation of Crystal Structure of B 2-Type in L 21-Type for Example Co 50 MnxGa 50--x Alloys