公开(公告)号：US11117838B2

公开(公告)日：2021-09-14

申请号：US15987269

申请日：2018-05-23

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Wayne Steffier ,  Michael Jacquinto ,  Stephen Harris ,  Robert Shinavski ,  Todd Engel

IPC: C04B35/80 ,  C04B35/634 ,  C04B35/638 ,  C04B35/657 ,  C04B35/628

Abstract: A method of making a fiber preform for ceramic matrix composite (CMC) fabrication that utilizes a fugitive binder and a machining step is described. The method includes, according to one embodiment, laying up a plurality of plies to form a stack, where each ply comprises an arrangement of fibers. The stack is infiltrated with a polymer at an elevated temperature to form an infiltrated stack that is cooled to form a rigid preform. The rigid fiber preform is machined to have a predetermined shape, such that a machined fiber preform is formed. A composite assembly including the machined fiber preform is formed and then the composite assembly is heated at a sufficient temperature to pyrolyze the polymer. Thus, a porous preform of a predetermined geometry is formed for further processing into a CMC.