Formation of boron carbide-boron nitride carbon compositions

Patent metadata

Field	Value
Publication number	US-9580359-B2
Application number	US-201414333714-A
Country	US
Kind code	B2
Filing date	Jul 17, 2014
Priority date	Jan 26, 2012
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A composition having nanoparticles of a boron carbide and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising boron and an organic component. The organic component is an organic compound having a char yield of at least 60% by weight or a thermoset made from the organic compound. A method of combining boron and an organic compound having a char yield of at least 60% by weight, and heating to form boron carbide or boron nitride nanoparticles.

First claim

What is claimed is:

1. A method comprising:
combining elemental boron and an organic compound having a char yield of at least 60% by weight to form a precursor mixture; and
heating the precursor mixture in an inert atmosphere or vacuum at a temperature that causes polymerization of the organic compound to a thermoset to form a thermoset composition.

2. The method of claim 1 , further comprising:
placing the precursor mixture into a mold or shaped reactor.

3. The method of claim 1 , further comprising:
forming the precursor mixture into a shaped component.

4. The method of claim 1 , wherein heating the precursor mixture is performed at 150-600° C.

5. The method of claim 1 , further comprising:
heating the thermoset composition in an inert atmosphere, argon, nitrogen, or vacuum at a temperature that causes formation of a ceramic comprising nanoparticles of boron carbide or boron nitride in a carbonaceous matrix.

6. The method of claim 5 , wherein heating the thermoset composition is performed at 500-1900° C.

7. A method comprising:
providing a precursor mixture of elemental boron and an organic compound;
heating the precursor mixture in a vacuum or in an inert atmosphere at elevated pressure and at a temperature that causes polymerization of the organic compound to a thermoset to form a boron-thermoset composition; and
heating the boron-thermoset composition in an inert atmosphere, argon, nitrogen, or vacuum at a temperature that causes formation of a ceramic comprising nanoparticles of boron carbide or boron nitride in a carbonaceous matrix;
wherein the organic compound has a char yield of at least 60% by weight when heated at the elevated pressure.

Assignees

• Keller Teddy M
• Saab Andrew
• Laskoski Matthew
• Us Gov Sec Navy

Inventors

• Keller Teddy M
• Saab Andrew
• Laskoski Matthew

Classifications

• C04B2235/9661

  Colour · CPC title

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title

• C04B2235/3821

  Boron carbides · CPC title

• C04B2235/421

  Boron · CPC title

• C04B2235/48

  Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins · CPC title