Boron nitride nanotube (BNNT)-nanoparticle composites, methods for the preparation thereof and their macroscopic assemblies

Patent metadata

Field	Value
Publication number	US-12286347-B2
Application number	US-201816647959-A
Country	US
Kind code	B2
Filing date	Sep 18, 2018
Priority date	Sep 21, 2017
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

The present application relates to boron nitride nanotube (BNNT)-nanoparticle composites, to methods of preparing such composites and their use, for example, in metal/ceramic matrix composites and/or macroscopic assemblies. For example, the methods comprise subjecting a source of hydrogen, a source of boron, a source of nitrogen and a nanoparticle precursor to a stable induction thermal plasma and cooling the reaction mixture to obtain the composite.

First claim

The invention claimed is:

1. A method for preparing a boron nitride nanotube (BNNT)-nanoparticle composite, the method comprising:
subjecting a source of hydrogen, a source of boron, a source of nitrogen and a nanoparticle precursor that is a non-catalytic metal or a non-catalytic ceramic to a stable induction thermal plasma to form a reaction mixture in the plasma; and
cooling the reaction mixture to obtain the BNNT-nanoparticle composite with nanoparticles attached to on outer surface of BNNTs.

2. The method of claim 1 , wherein the stable induction thermal plasma has a plasma temperature of about 1,000 K to about 10,000 K.

3. The method of claim 1 , wherein the reaction mixture is formed in the plasma at a pressure of less than 2 atm.

4. The method of claim 1 , wherein (a) the source of boron is boron nitride, elemental boron, borane, ammonia borane (borazane), borazine, a boron trihalide, a metal boride or mixtures thereof; (b) the source of nitrogen is boron nitride, N 2 , NH 3 , NH 4 OH, borazane, borazine or mixtures thereof; and/or (c) the source of hydrogen is H 2 , NH 3 , NH 4 OH, borane, borazane, borazine or mixtures thereof.

5. The method of claim 1 , wherein the nanoparticle precursor is a metal ceramic, or a metallic element or alloy.

6. The method of claim 5 , wherein the nanoparticle precursor is aluminum nitride (AIN), gallium nitride (GaN), tantalum nitride (TaN), tungsten nitride (W 2 N, WN, WN 2 ), magnesium nitride (Mg 3 N 2 ) or titanium nitride (TIN).

7. The method of claim 6 , wherein the nanoparticle precursor is AIN.

8. The method of claim 5 , wherein the nanoparticle precursor is copper metal, aluminum metal, silver metal, gold metal, gallium metal or magnesium metal.

9. The method of claim 8 , wherein the nanoparticle precursor is copper metal.

10. The method of claim 1 , wherein the source of boron is hexagonal boron nitride (h-BN); the source of nitrogen is a mixture of hexagonal boron nitride (h-BN) and N 2 ; and the source of hydrogen is H 2 .

11. The method of claim 10 , wherein the N 2 and H 2 are introduced into the stable induction plasma in a sheath gas.

12. The method of claim 11 , wherein the sheath gas further comprises argon.

13. The method of claim 10 , wherein the h-BN and the nanoparticle precursor are introduced into the stable induction plasma as a powder.

14. The method of claim 13 , wherein the ratio by weight of the h-BN to the nanoparticle precursor is from about 99:0.1 to about 50:50.

15. The method of claim 14 , wherein the ratio by weight of the h-BN to the nanoparticle precursor is from about 93.5:6.5 to about 50:50.

16. The method of claim 1 , wherein cooling the reaction mixture comprises cooling in a reaction zone downstream of the stable induction plasma.

Assignees

• Nat Res Council Canada

Inventors

• Kim Keun Su
• Simard Benoit
• Kingston Christopher Thomas
• Shin Homin

Classifications

• C01P2004/13

  Nanotubes · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title

• C01P2002/84

  by UV- or VIS- data · CPC title

• C01P2002/82

  by IR- or Raman-data · CPC title

• C01B21/0648 Primary

  After-treatment, e.g. grinding, purification (transformation of hexagonal into cubic or wurtzitic boron nitride C04B35/5831) · CPC title