Method for providing crystalline silicon-containing ceramic material

Patent metadata

Field	Value
Publication number	US-9908818-B2
Application number	US-201415027705-A
Country	US
Kind code	B2
Filing date	Sep 24, 2014
Priority date	Oct 8, 2013
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

Disclosed is a method for providing a crystalline ceramic material. In an example, the method includes providing a silicon-containing preceramic polymer material that can be thermally converted to one or more crystalline polymorphs. The silicon-containing preceramic polymer material includes dispersed therein an effective amount of dopant particles. The silicon-containing preceramic polymer material is then thermally converted to the silicon-containing ceramic material. The effective amount of dopant particles enhance the formation of at least one of the one or more crystalline polymorphs, relative to the silicon-containing preceramic polymer without the dopant particles, with respect to at least one of formation of a selected polymorph of the one or more crystalline polymorphs formed, an amount formed of a selected polymorph of the one or more crystalline polymorphs formed, and a temperature of formation of the one or more crystalline polymorphs.

First claim

What is claimed is:

1. A method for providing a crystalline ceramic material, the method comprising:
providing a silicon-containing preceramic polymer material that can be thermally converted to a silicon-containing ceramic material containing one or more crystalline polymorphs, the silicon-containing preceramic polymer material including dispersed therein an effective amount of dopant particles, wherein the dopant particles are either carbon-containing particles that are selected from the group consisting of boron carbide, nano-diamond, graphite, graphene, activated carbon, carbon nanotubes, and combinations thereof or nitride particles selected from the group consisting of gallium nitride, boron nitride, silicon nitride, and combinations thereof; and
thermally converting the silicon-containing preceramic polymer material to the silicon-containing ceramic material, the effective amount of dopant particles enhancing the formation of at least one of the one or more crystalline polymorphs, relative to the silicon-containing preceramic polymer without the dopant particles, with respect to at least one of:
formation of a selected polymorph of the one or more crystalline polymorphs formed,
an amount formed of a selected polymorph of the one or more crystalline polymorphs formed, and
a temperature of formation of the one or more crystalline polymorphs.

2. The method as recited in claim 1 , wherein the silicon-containing ceramic material is silicon carbide.

3. The method as recited in claim 1 , wherein the silicon-containing ceramic material is a silicon-carbon ceramic compound including an element selected from the group consisting of nitrogen, boron, oxygen and combinations thereof.

4. The method as recited in claim 1 , wherein the silicon-containing preceramic polymer material includes, by weight, up to 40% of the dopant particles.

5. The method as recited in claim 1 , wherein the silicon-containing preceramic polymer material includes, by weight, up to 20% of the dopant particles.

6. The method as recited in claim 1 , wherein the silicon-containing preceramic polymer material includes, by weight, up to 10% of the dopant particles.

7. The method as recited in claim 6 , wherein the silicon-containing preceramic polymer material includes, by weight, up to 5% of the dopant particles.

8. The method as recited in claim 1 , wherein the silicon-containing ceramic material is silicon carbide, the silicon-containing preceramic polymer material includes, by weight, up to 10% of the dopant particles, and the silicon-containing preceramic polymer material is disposed within pores of a silicon carbide fiber structure.

9. The method as recited in claim 1 , wherein the dopant particles are the carbon-containing particles and are selected from the group consisting of nano-diamond, graphite, graphene, activated carbon, carbon nanotubes, and combinations thereof.

10. The method as recited in claim 9 , wherein the silicon-containing preceramic polymer material includes, by weight, up to 5% of the dopant particles.

11. The method as recited in claim 1 , wherein the dopant particles are the nitride particles and are selected from the group consisting of gallium nitride, boron nitride, and combinations thereof.

12. The method as recited in claim 11 , wherein the silicon-containing preceramic polymer material includes, by weight, up to 5% of the dopant particles.

Assignees

• United Technologies Corp

Inventors

• Limarga Andi M
• Sheedy Paul
• Schmidt Wayde R
• Berczik Douglas M
• Kashyap Tania Bhatia
• Hermann Mark A

Classifications

• C04B2235/5288

  Carbon nanotubes · CPC title

• C04B2235/425

  Graphite · CPC title

• C04B2235/3852

  Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride · CPC title

• C04B2235/5244

  Silicon carbide · CPC title

• C04B2235/383

  Alpha silicon carbide · CPC title