Method for prepregging tackifier for cmc articles

Patent metadata

Field	Value
Publication number	US-2016229759-A1
Application number	US-201415022015-A
Country	US
Kind code	A1
Filing date	Sep 11, 2014
Priority date	Sep 17, 2013
Publication date	Aug 11, 2016
Grant date	—

Abstract

A method of creating a tackified prepreg includes steps of providing a fiber weave that have unidirectional fibers and woven sections spaced apart from one another to provide unidirectional fiber sections, applying a tackifier to the fiber weave, and separating the uni-directional fiber section from the woven sections.

First claim

What is claimed is:

1 . A method of creating a tackified prepreg, comprising steps of:
providing a fiber weave having unidirectional fibers and woven sections spaced apart from one another to provide unidirectional fiber sections; applying a tackifier to the fiber weave; and separating the unidirectional fiber section from the woven sections.

2 . The method according to claim 1 , wherein the woven sections are in alternating relationship to the unidirectional fiber sections, the woven sections include cross fibers arranged transverse to the unidirectional fibers.

3 . The method according to claim 1 , wherein the separating step includes cutting the unidirectional sections from the woven sections.

4 . The method according to claim 1 , comprising the step of feeding the fiber weave between rollers.

5 . The method according to claim 4 , wherein the fiber weave is fed through a bath of the tackifier.

6 . The method according to claim 4 , wherein the rollers include a feed direction, and the unidirectional fibers are arranged in the same direction as the feed direction.

7 . The method according to claim 1 , comprising the step of arranging layers of the unidirectional fiber sections onto one another to provide a stack.

8 . The method according to claim 1 , wherein the fibers are ceramic.

9 . The method according to claim 1 , wherein the tackifier is a pre-ceramic polymer.

10 . The method according to claim 9 , wherein the tackifier is a solid at room temperature.

11 . The method according to claim 10 , wherein the tackifier an amorphous solid.

12 . A method of creating a tackified prepreg, comprising steps of:
providing a fiber weave having unidirectional fibers and woven sections spaced apart from one another to provide unidirectional fiber sections; applying a tackifier to the fiber weave; arranging layers of the fiber weave onto one another to provide a stack; and wrapping the stack around a form to provide an article having a desired shape.

13 . The method according to claim 12 , comprising the step of applying a resin to the article in a mold.

14 . The method according to claim 13 , wherein the resin is a liquid at room temperature.

15 . The method according to claim 15 , wherein the resin is a ceramic-based.

16 . The method according to claim 16 , wherein the tackifier and resin are silicon carbide-based.

17 . The method according to claim 12 , comprising heating and curing the article.

18 . The method according to claim 18 , comprising the step of machining the cured article.

19 . The method according to claim 19 , comprising the step of pyrolyzing the article, including the tackifier and the resin, subsequent to the machining step.

20 . A CMC article for a gas turbine engine comprising:
A wall having multiple tacks joined to one another, each stack including multiple layers, wherein the layers consist of unidirectional fibers forming a ceramic matrix composite with a resin and a tackifier that are different than one another.

Assignees

• United Technologies Corp

Inventors

• Prevost Erica L
• Sember Alex J

Classifications

• F01D9/041

  using blades (F01D5/148 takes precedence) · CPC title

• C04B35/571

  obtained from {Si-containing} polymer precursors {or organosilicon monomers} · CPC title

• F01D5/284

  Selection of ceramic materials · CPC title

• C04B41/87

  Ceramics · CPC title

• F05D2230/31

  Layer deposition · CPC title