公开(公告)号：US11760699B2

公开(公告)日：2023-09-19

申请号：US16924742

申请日：2020-07-09

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Christopher Whitmore ,  Stephen Harris ,  Sungbo Shim ,  Timothy Western

IPC: C04B41/51 ,  C04B41/87 ,  C04B41/00 ,  C04B41/45 ,  C04B41/50

CPC classification number: C04B41/5183 ,  C04B41/0081 ,  C04B41/4523 ,  C04B41/5066 ,  C04B41/87 ,  C04B2235/3873 ,  C04B2235/616

Abstract: A method of altering a surface of a ceramic matrix composite to aid in nodule removal is described. A fiber preform comprising a framework of ceramic fibers is heated to a temperature at or above a melting temperature of silicon. During the heating, the fiber preform is infiltrated with a molten material comprising silicon. After the infiltration, the fiber preform is cooled, and the infiltrated fiber preform is exposed to a gas comprising nitrogen during cooling. Silicon nitride may be formed by a reaction of free (unreacted) silicon at or near the surface of the infiltrated fiber preform with the nitrogen. Thus, a ceramic matrix composite having a surface configured for easy nodule removal is formed. Any silicon nodules formed on the surface during cooling may be removed without machining or heat treatment.

公开(公告)号：US20210009480A1

公开(公告)日：2021-01-14

申请号：US16924742

申请日：2020-07-09

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Christopher Whitmore ,  Stephen Harris ,  Sungbo Shim ,  Timothy Western

IPC: C04B41/51 ,  C04B41/87 ,  C04B41/45 ,  C04B41/00

Abstract: A method of altering a surface of a ceramic matrix composite to aid in nodule removal is described. A fiber preform comprising a framework of ceramic fibers is heated to a temperature at or above a melting temperature of silicon. During the heating, the fiber preform is infiltrated with a molten material comprising silicon. After the infiltration, the fiber preform is cooled, and the infiltrated fiber preform is exposed to a gas comprising nitrogen during cooling. Silicon nitride may be formed by a reaction of free (unreacted) silicon at or near the surface of the infiltrated fiber preform with the nitrogen. Thus, a ceramic matrix composite having a surface configured for easy nodule removal is formed. Any silicon nodules formed on the surface during cooling may be removed without machining or heat treatment.