Plate-like alumina particle and method for manufacturing plate-like alumina particle

Patent metadata

Field	Value
Publication number	US-12459830-B2
Application number	US-201917766716-A
Country	US
Kind code	B2
Filing date	Oct 9, 2019
Priority date	Oct 9, 2019
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A plate-like alumina particle, in which a ratio I(006)/I(ll3) of a peak intensity I(006) at 20=41.6±0.3 degrees which corresponds to a (006) face to a peak intensity I(113) at 20=43.3±0.3 degrees which corresponds to a (113) face of diffraction peaks obtained by X-ray diffraction measurement using a Cu-Ka ray, is 0.2 or more. A method for manufacturing the plate-like alumina particle including mixing an aluminum compound including an aluminum element, a molybdenum compound including a molybdenum element, and a shape-controlling agent to produce a mixture and firing the mixture.

First claim

The invention claimed is:

1 . A method for manufacturing a plate-like alumina particle, the method comprising:
mixing an aluminum compound containing an aluminum element of 50% by mass or more in a form of Al 2 O 3 , a molybdenum compound containing a molybdenum element of 7% by mass or more and 40% by mass or less in a form of MoO 3 , and a raw material germanium compound of 0.4% by mass or more and less than 1.5% by mass in a form of GeO 2 to produce a mixture; and firing the mixture, wherein each of the 50% by mass, the 7% by mass, the 40% by mass, the 0.4% by mass, and 1.5% by mass is a mass percentage with respect to a total amount of raw materials in forms of oxides which is assumed to be 100% by mass, for the plate-like alumina particle, a ratio I(006)/I(113) of a peak intensity I(006) to a peak intensity I(113) is 0.2 or more, the peak intensity I(006) is an intensity of a peak at 2θ=41.6±0.3 degrees which corresponds to a (006)-face diffraction peak obtained by X-ray diffraction measurement using a Cu-Kα ray, and the peak intensity I(113) is an intensity of a peak at 2θ=43.3±0.3 degrees which corresponds to a (113)-face diffraction peak obtained by X-ray diffraction measurement using a Cu-Kα ray.

2 . The method according to claim 1 ,
wherein a thickness of the plate-like alumina particle is 0.1 μm or more.

3 . The method according to claim 1 ,
wherein a D 50 value of the plate-like alumina particle is 20 μm or more.

4 . The method according to claim 1 ,
wherein the plate-like alumina particle comprises mullite in a surface layer.

5 . The method according to claim 2 ,
wherein a D 50 value of the plate-like alumina particle is 20 μm or more.

6 . The method according to claim 2 ,
wherein the plate-like alumina particle comprises mullite in a surface layer.

7 . The method according to claim 3 ,
wherein the plate-like alumina particle comprises mullite in a surface layer.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Yang Shaowei
• Dohi Tomoki
• Oki Hironobu
• Yuan Jianjun
• Liu Cheng
• Li Meng
• Zhao Wei

Classifications

• C08K2003/2227

  of aluminium · CPC title

• C08K7/24

  inorganic · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title

• C01F7/442 Primary

  in presence of a calcination additive · CPC title