Method for prepregging tackifier for cmc articles

Abstract

A method of creating a tackified prepreg, includes 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.

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;   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.   
     
     
         2 . The method according to  claim 1 , comprising the step of applying a resin to the article in a mold. 
     
     
         3 . The method according to  claim 2 , wherein the resin is a liquid at room temperature. 
     
     
         4 . The method according to  claim 3 , wherein the resin is a ceramic-based. 
     
     
         5 . The method according to  claim 4 , wherein the tackifier and resin are silicon carbide-based. 
     
     
         6 . The method according to  claim 1 , comprising heating and curing the article. 
     
     
         7 . The method according to  claim 6 , comprising the step of machining the cured article. 
     
     
         8 . The method according to  claim 7 , comprising the step of pyrolyzing the article, including the tackifier and the resin, subsequent to the machining step. 
     
     
         9 . 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.