Composite ceramic powder, sealing material, and composite ceramic powder production method

Patent metadata

Field	Value
Publication number	US-10913686-B2
Application number	US-201716314990-A
Country	US
Kind code	B2
Filing date	Jun 19, 2017
Priority date	Jul 6, 2016
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A composite ceramic powder of the present invention includes: a LAS-based ceramic powder having precipitated therein β-eucryptite or a β-quartz solid solution as a main crystal; and TiO 2 powder and/or ZrO 2 powder.

First claim

The invention claimed is:

1. A method of producing a composite ceramic powder, comprising the steps of:
firing a raw material batch to obtain, through a solid phase reaction, a sintered body having precipitated therein β-eucryptite or a β-quartz solid solution as a main crystal;
pulverizing the sintered body to obtain a LAS-based ceramic powder; and
mixing the obtained LAS-based ceramic powder and TiO 2 powder and/or ZrO 2 powder to obtain a composite ceramic powder.

2. The method of producing a composite ceramic powder according to claim 1 , comprising using a pulverized product of a pre-sintered body containing Li, Al, and Si as a whole or part of introduction raw materials for Li, Al, and Si of the LAS-based ceramic powder.

3. The method of producing a composite ceramic powder according to claim 1 , comprising using any one of an oxide raw material, a hydroxide raw material, and a carbonate raw material as a whole or part of introduction raw materials for Li, Al, and Si of the LAS-based ceramic powder.

4. The method of producing a composite ceramic powder according to claim 1 , comprising blending the raw material batch so that the LAS-based ceramic powder to be obtained comprises as a composition, in terms of mol %, 10% to 35% of Li 2 O, 10% to 35% of Al 2 O 3 , and 30% to 80% of SiO 2 .

5. The method of producing a composite ceramic powder according to claim 1 , wherein the firing a raw material batch is performed at from 1,000° C. to 1,450° C. to obtain, through the solid phase reaction, the sintered body having precipitated therein β-eucryptite or a β-quartz solid solution as a main crystal.

6. The method of producing a composite ceramic powder according to claim 1 , wherein the pulverizing the sintered body is performed so that the LAS-based ceramic powder is substantially free of microcracks.

7. The method of producing a composite ceramic powder according to claim 1 , wherein a content of the TiO 2 powder and the ZrO 2 powder in terms of a total content is from 0.05 mass % to 10 mass %.

8. The method of producing a composite ceramic powder according to claim 1 , wherein the composite ceramic powder is substantially free of a glass phase.

9. A method of producing a sealing material, comprising a glass powder and a composite ceramic powder,
wherein the composite ceramic powder is produced by the method of producing a composite ceramic powder according to claim 1 .

Assignees

• Nippon Electric Glass Co

Inventors

• Hirose Masayuki
• Nishikawa Yoshikatsu
• Oka Takuji

Classifications

• C03C8/24 Primary

  Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders · CPC title

• C04B2235/87

  Grain boundary phases intentionally being absent · CPC title

• C04B35/62685

  characterised by the order of addition of constituents or additives · CPC title

• C04B2235/767

  Hexagonal symmetry, e.g. beta-Si3N4, beta-Sialon, alpha-SiC or hexa-ferrites · CPC title

• C04B2235/6562

  Heating rate · CPC title