公开(公告)号：US11971216B1

公开(公告)日：2024-04-30

申请号：US17561152

申请日：2021-12-23

Applicant: Rolls-Royce High Temperature Composites, Inc.

Inventor： Kevin Lukhard ,  Timothy Western ,  Thomas Tran

IPC: F27B5/02 ,  F27B5/12 ,  F27D5/00

CPC classification number: F27B5/02 ,  F27B5/12 ,  F27D5/0006

Abstract: In some examples, a multilevel retort assembly. The assembly includes a base defining a base perimeter; and a plurality of shells. Each shell has a diffuser plate support and a perimeter with a substantially similar shape as the base perimeter. The plurality of shells are stacked on each other, mechanically supported by the base, and surround an inner retort volume. The at least one shell of the plurality of shells defines a removable window. The assembly also includes a plurality of diffuser plates, each diffuser plate supported by a corresponding diffuser plate support of the plurality of diffuser plate supports.

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.