Aluminum nitride-based powder and method for producing same

Patent metadata

Field	Value
Publication number	US-12281010-B2
Application number	US-201816615498-A
Country	US
Kind code	B2
Filing date	May 17, 2018
Priority date	May 22, 2017
Publication date	Apr 22, 2025
Grant date	Apr 22, 2025

Abstract

To provide an aluminum nitride-based powder that includes less amount of fine powder that is hard to be completely removed, has superior filling performance for a polymeric material, and also has thermal conductivity. The present invention relates to an aluminum nitride-based powder comprising aluminum nitride-based particles, wherein (1) the average particle size D50 is 15 to 200 μm; (2) a content of particles having a particle size of at most 5 μm is at most 60% on a particle number basis; (3) a content of an alkaline earth metal element and a rare-earth element is at most 0.1 weight %; (4) a content of oxygen is at most 0.5 weight %; and (5) a content of silicon is at most 1000 ppm by weight, and a content of iron is at most 1000 ppm by weight.

First claim

The invention claimed is:

1. An aluminum nitride-based powder comprising aluminum nitride-based particles, wherein
(1) an average particle diameter D50 is 15 to 200 μm;
(2) a content of particles having a particle diameter of 5 μm or less is not more than 60% on a particle number basis;
(3) a content of an alkaline earth metal element and a rare-earth element is not more than 0.1 weight %;
(4) a content of oxygen is not more than 0.2 weight %;
(5) a content of silicon is not more than 1000 ppm by weight, and a content of iron is not more than 1000 ppm by weight, and
(6) a BET specific surface area of the aluminum nitride-based powder is 0.05 to 0.1 m 2 /g.

2. The aluminum nitride-based powder according to claim 1 , wherein the aluminum nitride-based powder contains an agglomerating particle in which fine particles having a particle diameter of 5 μm or less adhere to particles having a particle diameter of more than 5 μm.

3. The aluminum nitride-based powder according to claim 1 , wherein the aluminum nitride-based powder contains an agglomerating particle in which fine particles having a particle diameter of 1 μm or less adhere to particles having a particle diameter of more than 5 μm, an average number of the fine particle adhering to one side of the particle having a particle size of more than 5 μm is 50 or less.

4. The aluminum nitride-based powder according to claim 1 , wherein a content of carbon is not more than 0.1 weight %.

5. The aluminum nitride-based powder according to claim 1 , wherein the aluminum nitride-based powder has a BET specific surface area of 0.08 to 0.5 m 2 /g.

6. The aluminum nitride-based powder according to claim 1 , wherein a content of particles having a particle size of 5 pm or less is not more than 35% on a particle number basis.

7. A composition comprising:
the aluminum nitride-based powder according to claim 1 ; and
a polymeric material.

8. A composition comprising:
the aluminum nitride-based powder according to claim 2 ; and
a polymeric material.

9. A composition comprising:
the aluminum nitride-based powder according to claim 3 ; and
a polymeric material.

10. A composition comprising:
the aluminum nitride-based powder according to claim 4 ; and
a polymeric material.

11. A composition comprising:
the aluminum nitride-based powder according to claim 5 ; and
a polymeric material.

Assignees

• Toyo Aluminium Kk

Inventors

• Tanaka Takamasa
• Kusui Jun
• Nakashima Katsumi
• Higashimura Kazuya
• Kanno Shuhei

Classifications

• C08K2003/282

  Binary compounds of nitrogen with aluminium · CPC title

• C08K3/28

  Nitrogen-containing compounds · CPC title

• C01P2004/60

  Particles characterised by their size · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01P2006/12

  Surface area · CPC title