IP Library › Granted Patent US 12,286,347
Granted Patent B2
US 12,286,347 · App. 16/647,959 · Granted Apr 29, 2025

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

Inventors: Keun Su Kim (Ottawa, CA); Benoit Simard (Ottawa, CA); Christopher Thomas Kingston (Ottawa, CA); Homin Shin (Ottawa, CA)
Assignee: National Research Council of Canada
C01B21/0646C01B21/0648B82Y30/00B82Y40/00C01P2002/82C01P2002/84C01P2004/04C01P2004/13
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Quick Facts
Patent No.
US 12,286,347
App. No.
16/647,959
Granted
Apr 29, 2025
Kind
B2
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.

Claims (18)

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.

Continuity (2)
Provisional Application 62561405 · Sep 21, 2017
Related Publication 20200216317A1 · Jul 9, 2020
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