公开(公告)号：US11472747B2

公开(公告)日：2022-10-18

申请号：US16596054

申请日：2019-10-08

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Andrew J. Ritchey

IPC: C04B35/628 ,  C04B35/80 ,  C04B40/00 ,  C23C16/04 ,  C23C16/458

Abstract: A method of infiltrating a fiber preform comprises positioning an assembly in a process chamber, where the assembly includes a tool comprising through-holes, a fiber preform constrained within the tool, and a sacrificial preform disposed between the fiber preform and the tool. The sacrificial preform is gas permeable. The process chamber is heated, and gaseous reactants are delivered into the process chamber during the heating. The gaseous reactants penetrate the through-holes of the tool and infiltrate the sacrificial preform and the fiber preform. Deposition of reaction products occurs on exposed surfaces of the fiber preform and the sacrificial preform, and a coating is formed thereon. In addition, the sacrificial preform accumulates excess coating material formed from increased reactions at short diffusion depths. Accordingly, the coating formed on the fiber preform exhibits a thickness variation of about 10% or less throughout a volume of the fiber preform.

公开(公告)号：US20210101841A1

公开(公告)日：2021-04-08

申请号：US16596054

申请日：2019-10-08

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Andrew J. Ritchey

IPC: C04B35/628 ,  C04B40/00 ,  C04B35/80 ,  C23C16/458 ,  C23C16/04

Abstract: A method of infiltrating a fiber preform comprises positioning an assembly in a process chamber, where the assembly includes a tool comprising through-holes, a fiber preform constrained within the tool, and a sacrificial preform disposed between the fiber preform and the tool. The sacrificial preform is gas permeable. The process chamber is heated, and gaseous reactants are delivered into the process chamber during the heating. The gaseous reactants penetrate the through-holes of the tool and infiltrate the sacrificial preform and the fiber preform. Deposition of reaction products occurs on exposed surfaces of the fiber preform and the sacrificial preform, and a coating is formed thereon. In addition, the sacrificial preform accumulates excess coating material formed from increased reactions at short diffusion depths. Accordingly, the coating formed on the fiber preform exhibits a thickness variation of about 10% or less throughout a volume of the fiber preform.