Invention Grant
- Patent Title: Method for manufacturing plate-like alumina powder and plate-like alumina powder
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Application No.: US15446479Application Date: 2017-03-01
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Publication No.: US10343928B2Publication Date: 2019-07-09
- Inventor: Morimichi Watanabe , Hiroshi Fukui , Kei Sato , Tsutomu Nanataki
- Applicant: NGK INSULATORS, LTD.
- Applicant Address: JP Nagoya
- Assignee: NGK Insulators, Ltd.
- Current Assignee: NGK Insulators, Ltd.
- Current Assignee Address: JP Nagoya
- Agency: Burr & Brown, PLLC
- Priority: JP2014-241684 20141128
- Main IPC: C01F7/30
- IPC: C01F7/30 ; C04B35/626 ; C30B1/02 ; C30B29/20 ; C30B29/64 ; C01F7/44 ; C04B35/111

Abstract:
96 parts by mass of a γ-alumina powder, 4 parts by mass of a an AlF3 powder, and 0.17 parts by mass of an α-alumina powder as a seed crystal were mixed by a pot mill. The purities of each raw material were evaluated, and it was found that the mass ratio of each impurity element other than Al, O, F, H, C, and S was 10 ppm or less. In a high-purity alumina-made sagger having a purity of 99.9 percent by mass, 300 g of the obtained mixed powder was received, and after a high-purity alumina-made lid having a purity of 99.9 percent by mass was placed on the sagger, a heat treatment was perforated at 900° C. for 3 hours in an electric furnace in an air flow atmosphere, so that an alumina powder was obtained. The value of AlF3 mass/container volume was 0.016 g/cm3.
Public/Granted literature
- US20170166454A1 METHOD FOR MANUFACTURING PLATE-LIKE ALUMINA POWDER AND PLATE-LIKE ALUMINA POWDER Public/Granted day:2017-06-15
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