WO2016141575A1 - Manufacturing method for nano sized alpha alumina - Google Patents

Manufacturing method for nano sized alpha alumina Download PDF

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Publication number
WO2016141575A1
WO2016141575A1 PCT/CN2015/074040 CN2015074040W WO2016141575A1 WO 2016141575 A1 WO2016141575 A1 WO 2016141575A1 CN 2015074040 W CN2015074040 W CN 2015074040W WO 2016141575 A1 WO2016141575 A1 WO 2016141575A1
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WO
WIPO (PCT)
Prior art keywords
alumina
alpha alumina
gel
powder
seed
Prior art date
Application number
PCT/CN2015/074040
Other languages
English (en)
French (fr)
Inventor
Shengguo Wang
Wei Wang
Original Assignee
Shengguo Wang
Wei Wang
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 Shengguo Wang, Wei Wang filed Critical Shengguo Wang
Priority to PCT/CN2015/074040 priority Critical patent/WO2016141575A1/en
Priority to CN201580077623.1A priority patent/CN107406268A/zh
Publication of WO2016141575A1 publication Critical patent/WO2016141575A1/en

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    • 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
    • C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
    • C01F7/447—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by wet processes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives
    • C09K3/1409—Abrasive particles per se
    • C09K3/1418—Abrasive particles per se obtained by division of a mass agglomerated by sintering
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • 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
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer

Definitions

  • the invention relates to a manufacturing method to prepare nano sized alpha alumina, suitable as seed material for sol gel abrasive grain manufacture.
  • the raw material of this manufacturing method is nano crystalline alpha alumina monohydrate derived from hydrothermally treated alumina trihydrate and the manufacturing process is conventional sol gel route including seed suspension & sol preparation, gel formation, drying, calcining, sintering and disagglomerating the powder.
  • the 3M Co. invented a sol gel abrasive material called Cubitron for use in coated abrasive products such as fiber discs, grinding belts and flap discs.
  • the Norton Company introduced seeded gel (SG) abrasive. This abrasive was a natural outcome of the wave of technology sweeping the ceramics industry at that time to develop high strength engineering ceramics using sol gel process.
  • This class of abrasive is often termed “ceramic” .
  • Seeded gel is produced by a chemical process. Nano sized alpha alumina seed suspension with small dispersed particle size (preferably less than 300 nanometers) is mixed with boehmite precursor sol and gelled. The resulting gel is dried, granulated to size, calcined and sintered. The resulting grains are composed of a single phase alpha alumina structure with a crystalline size of about 0.2 ⁇ m. Defects from crushing are avoided; the resulting abrasive grain is unusually tough but self-sharpening because fracture now occurs at the micron level.
  • the key raw materials of seeded sol gel abrasive grain include high purity nano-sized alpha alumina seed and boehmite.
  • High purity nano-sized alpha alumina is available from the market.
  • the suppliers include Sumitomo Chemical Co., Ltd., Taimei Chemicals Co., Ltd. and some Chinese suppliers. But high purity nano-sized alpha alumina is usually not cheap due to its current manufacture methods.
  • US 4,657,754 describes a method of preparing an alumina powder containing alpha alumina crystals having a size below 1 micron comprising seeding an alumina gel precursor of alpha alumina with submicron alpha alumina seed particles, sintering the seeded precursor at 900°C to 1350°C for a time sufficient to convert at least a portion of the non-alpha alumina to alpha alumina, and crushing the sintered product to a powder having a particle size of less than 1 micron.
  • US5,284,809 describes a method for the preparation of very finely particulate alpha alumina powder comprising: (a) forming a suspension of a precursor of alpha alumina and sufficient liquid to provide a solid content in the suspension of 10 to 40 weight percent, the precursor of alumina being aluminum hydroxide, Al (OH) 3 ; (b) wet milling and disagglomerated agglomerates of the aluminum oxide; (c) drying the disagglomerated suspension to provide a dried particulate material; (d) calcining the dried particulate material at a temperature of 1000 to 1350°C; and (e) milling and disagglomerating the calcined particulate material to provide the very finely particulate alpha alumina powder.
  • This method used cheap raw material aluminum hydroxide, Al (OH) 3 ; but the Al(OH) 3 is from Bayer process, so it’s not high purity alpha alumina.
  • High purity, nano-sized alpha alumina powder from Sumitomo or Taimei is mixed with deionized water and nitric acid in a high shear mixer to form slurry; then the slurry is ground in a nano mill to particle size D 50 ⁇ 200 nm.
  • the alpha alumina seed suspension is mixed with sol of alpha alumina monohydrate (boehmite) , the seed alumina is 1 wt%of final alpha alumina content.
  • the mixed dispersion is then gelled, dried, calcined and disagglometated to finely particulate powder by ball mill, jet mill, nano mill or small media mill.
  • alpha alumina precursor boehmite is converted from hydrothermally treated alumina trihydrate Al (OH) 3 , so the cost is very attractive and the impurities is less than 0.1%, the obtained nano-sized alpha alumina is suitable as seed material for ceramic abrasive manufacture.
  • Fig. 1 is process to make nano sized alpha alumina.
  • Fig. 1 The invented manufacturing method to make nano sized alpha alumina is illustrated in Fig. 1.
  • the detailed description of the invention is illustrated in the following example.
  • the gel was dried and pulverized to a powder of -120 mesh, then the powder was calcined in a 1200 °C rotary kiln which was a 15 cm diameter, 200 cm long silicon carbon tube for 6 minutes.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Compositions Of Oxide Ceramics (AREA)
PCT/CN2015/074040 2015-03-11 2015-03-11 Manufacturing method for nano sized alpha alumina WO2016141575A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2015/074040 WO2016141575A1 (en) 2015-03-11 2015-03-11 Manufacturing method for nano sized alpha alumina
CN201580077623.1A CN107406268A (zh) 2015-03-11 2015-03-11 纳米阿尔法氧化铝的生产方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/074040 WO2016141575A1 (en) 2015-03-11 2015-03-11 Manufacturing method for nano sized alpha alumina

Publications (1)

Publication Number Publication Date
WO2016141575A1 true WO2016141575A1 (en) 2016-09-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/074040 WO2016141575A1 (en) 2015-03-11 2015-03-11 Manufacturing method for nano sized alpha alumina

Country Status (2)

Country Link
CN (1) CN107406268A (zh)
WO (1) WO2016141575A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112661496A (zh) * 2020-12-25 2021-04-16 淄博晨曜陶瓷科技有限公司 一种新能源锂电池隔膜涂覆用超细无机粉体

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113620328B (zh) * 2021-08-17 2023-07-11 苏瓷纳米技术(苏州)有限公司 纳米氧化铝晶种的制备方法、高纯氧化铝纳米晶的制备方法
CN115520885B (zh) * 2022-08-29 2024-03-22 深圳陶陶科技有限公司 一种由氢氧化铝粗粉制备多级结构勃姆石及陶瓷用氧化铝的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4657754A (en) * 1985-11-21 1987-04-14 Norton Company Aluminum oxide powders and process
US5007943A (en) * 1989-11-03 1991-04-16 Norton Company Sol-gel process alumina abrasive grain blends in coated abrasive material
US5383945A (en) * 1984-01-19 1995-01-24 Norton Company Abrasive material and method
US5876470A (en) * 1997-08-01 1999-03-02 Minnesota Mining And Manufacturing Company Abrasive articles comprising a blend of abrasive particles
WO2008079680A1 (en) * 2006-12-19 2008-07-03 Saint-Gobain Ceramics & Plastics, Inc. Submicron alpha alumina high temperature bonded abrasives

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103013442B (zh) * 2011-09-22 2014-05-14 鲁信创业投资集团股份有限公司 一种α-氧化铝基磨料及其制备方法
CN102815732A (zh) * 2012-09-20 2012-12-12 天津碧海蓝天水性高分子材料有限公司 一种具有高分散性能的纳米勃姆石、制备方法及其应用

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5383945A (en) * 1984-01-19 1995-01-24 Norton Company Abrasive material and method
US4657754A (en) * 1985-11-21 1987-04-14 Norton Company Aluminum oxide powders and process
US5007943A (en) * 1989-11-03 1991-04-16 Norton Company Sol-gel process alumina abrasive grain blends in coated abrasive material
US5876470A (en) * 1997-08-01 1999-03-02 Minnesota Mining And Manufacturing Company Abrasive articles comprising a blend of abrasive particles
WO2008079680A1 (en) * 2006-12-19 2008-07-03 Saint-Gobain Ceramics & Plastics, Inc. Submicron alpha alumina high temperature bonded abrasives

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112661496A (zh) * 2020-12-25 2021-04-16 淄博晨曜陶瓷科技有限公司 一种新能源锂电池隔膜涂覆用超细无机粉体

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Publication number Publication date
CN107406268A (zh) 2017-11-28

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