Title:
α-アルミナ粒子およびその製造方法
Document Type and Number:
Japanese Patent JP4556284
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain an α-alumina particle suitable for a polishing material a raw material for single crystals and a filler and having >30 and <=1,000 μm average primary particle diameter, a narrow distribution of particle size, a polyhedral form of a uniform shape and >=99.9 mass % purity, and to provide a method for producing the α-alumina particle. SOLUTION: This method for producing the α-alumina particle comprises baking aluminum hydroxide having >=99.9 mass % purity and >=450 deg.C dehydrating temperature in an atmosphere containing at least one kind of gas selected from (a) hydrogen chloride, (b) a component prepared from molecular chlorine and water vapor and (3) molecular chlorine at a temperature within the range of >=800 and <=1,200 deg.C. The resultant α-alumina particle has the polyhedral form, <=3 aspect ratio, <=5 D90/D10 when the particle diameters of cumulative 10% and 90% are D10 and D90 from the fine particle side of a cumulative particle size distribution of the α-alumina particle, >30 and <=1,000 μm average primary particle diameter and >=99.9 mass % purity.
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Inventors:
Yoshio Uchida
Nao Watanabe
Nao Watanabe
Application Number:
JP2000123986A
Publication Date:
October 06, 2010
Filing Date:
April 25, 2000
Export Citation:
Assignee:
Sumitomo Chemical Co., Ltd.
International Classes:
C01F7/44; C08K3/22; C09K3/14
Domestic Patent References:
| JP2239113A | ||||
| JP1275421A | ||||
| JP8290814A | ||||
| JP7206432A | ||||
| JP7206430A | ||||
| JP6191835A | ||||
| JP11021125A | ||||
| JP2001180930A | ||||
| JP2001139326A |
Attorney, Agent or Firm:
Toru Nakayama