Fugitive fiber commingling to provide loft in ceramic fiber tows

Patent metadata

Field	Value
Publication number	US-11434176-B2
Application number	US-201816111508-A
Country	US
Kind code	B2
Filing date	Aug 24, 2018
Priority date	Dec 11, 2017
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A method of making a ceramic fiber tow and the system regarding the same may be included. The method may include commingling a plurality of ceramic fibers with a fugitive fiber to form a single ceramic fiber tow. The fugitive fiber may be positioned between at least two ceramic fibers included in the single ceramic fiber tow. The method may further include forming a porous ceramic preform including at least the single ceramic fiber tow. The method may further include removing the fugitive fiber from the ceramic fiber tow leaving a space between at least two ceramic fibers of the single ceramic fiber tow. The method may further include replacing the spaces between ceramic fibers included in the ceramic fiber tows with a ceramic matrix.

First claim

What is claimed is:

1. A method comprising:
commingling a plurality of ceramic fibers with a fugitive fiber to form a ceramic fiber tow, the fugitive fiber positioned between at least two ceramic fibers of the ceramic fiber tow;
forming a porous ceramic preform comprising at least the ceramic fiber tow;
removing the fugitive fiber from the ceramic fiber tow leaving a space between the at least two ceramic fibers of the ceramic fiber tow;
infiltrating the porous ceramic preform to form a ceramic matrix composite component, the infiltrating comprising chemical vapor infiltration and/or melt infiltration, and replacing the space between the at least two ceramic fibers of the single ceramic fiber tow at least in part by a ceramic matrix.

2. The method of claim 1 , further comprising removing a native polymer from the ceramic fibers.

3. The method of claim 2 , wherein removing the native polymer from the ceramic fibers comprises thermally decomposing the native polymer.

4. The method of claim 2 , wherein removing the native polymer from the ceramic fibers comprises dissolving the native polymer.

5. The method of claim 1 , wherein commingling the ceramic fibers with the fugitive fiber comprises rolling the ceramic fibers and the fugitive fiber through a series of rollers.

6. The method of claim 1 , wherein commingling the plurality of ceramic fibers with the fugitive fiber is carried out with a ratio of ceramic fibers to fugitive fiber is between 1:0.05 and 1:2 by volume.

7. The method of claim 1 , wherein the commingling the ceramic fibers with the fugitive fiber comprises air-jet texturing.

8. The method of claim 1 , wherein the removing the fugitive fiber from the ceramic fiber tow comprises thermally decomposing the fugitive fiber.

9. The method of claim 1 , wherein removing the fugitive fiber from the ceramic fiber tow comprises dissolving the fugitive fiber.

10. The method of claim 1 , wherein removing the fugitive fiber from the ceramic fiber tow leaving a space between the at least two ceramic fibers of the single ceramic fiber tow comprises positioning each of the ceramic fibers a distance apart from each other ceramic fiber, the distance being between 0.1 μm and 200 μm.

11. The method of claim 1 , further comprising forming the ceramic fiber tow into a uni-directional tape.

Assignees

• Rolls Royce High Temperature Composites Inc

Inventors

• Harris Stephen

Classifications

• D10B2331/06

  polyethers · CPC title

• C04B2235/5244

  Silicon carbide · CPC title

• C04B2235/5224

  Alumina or aluminates · CPC title

• D02J1/18

  Separating or spreading · CPC title

• D10B2331/04

  polyesters, e.g. polyethylene terephthalate [PET] · CPC title