公开(公告)号：US20210147302A1

公开(公告)日：2021-05-20

申请号：US17066814

申请日：2020-10-09

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Camila S. Bortoluzzi ,  Stephen J. Richards

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

Abstract: A method of producing a CMC having a smooth surface includes forming a fiber preform; rigidizing the preform with an interphase coating; infiltrating a ceramic slurry into the preform to form a green body; conducting secondary operations on the green body; applying a slurry-based layer onto a portion of the green body; and infiltrating the green body with a molten silicon or silicon alloy, such that the CMC exhibits a smooth surface. The application of the slurry-based surface layer onto the green body includes placing the green body into a tool fixture having upper and lower components, such that a gap is present between the green body and at least one of the upper and lower components; and delivering a surface layer slurry into at least one gap, such that the surface layer slurry forms the slurry-based layer on at least a portion of the green body.

公开(公告)号：US12054438B2

公开(公告)日：2024-08-06

申请号：US17006191

申请日：2020-08-28

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Camila S. Bortoluzzi ,  Sungbo Shim

IPC: C04B41/52 ,  C04B35/628 ,  C04B35/80 ,  C04B41/00 ,  C04B41/45 ,  C04B41/50 ,  C04B41/51

CPC classification number: C04B41/52 ,  C04B35/62863 ,  C04B35/62871 ,  C04B35/80 ,  C04B41/0072 ,  C04B41/4525 ,  C04B41/4531 ,  C04B41/4578 ,  C04B41/4584 ,  C04B41/5001 ,  C04B41/5059 ,  C04B41/5066 ,  C04B41/5096 ,  C04B41/5105 ,  C04B2235/524 ,  C04B2235/5252 ,  C04B2235/614 ,  C04B2235/616 ,  C04B2235/6567

Abstract: A method of producing a melt infiltrated ceramic matrix composite (CMC) article that includes the steps of: forming a ceramic fiber preform; optionally, rigidizing the ceramic fiber preform with a fiber interphase coating via a Chemical Vapor Infiltration (CVI) process, infiltrating a ceramic slurry into the porous body or preform, conducting one or more secondary operations, and finally, melt infiltrating the preform with molten silicon or a silicon alloy to form the CMC article. The infiltration of a ceramic slurry into a ceramic fiber preform to form a green body is performed along with the use of convection and/or conduction as heat transfer mechanisms, such that the ceramic slurry does not require the incorporation of a pre-gelation material in order for the slurry to remain within the green body during subsequent processing steps.

公开(公告)号：US20210155558A1

公开(公告)日：2021-05-27

申请号：US17006191

申请日：2020-08-28

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Camila S. Bortoluzzi ,  Sungbo Shim

IPC: C04B41/52 ,  C04B41/45 ,  C04B41/00 ,  C04B41/50 ,  C04B41/51 ,  C04B35/80

Abstract: A method of producing a melt infiltrated ceramic matrix composite (CMC) article that includes the steps of: forming a ceramic fiber preform; optionally, rigidizing the ceramic fiber preform with a fiber interphase coating via a Chemical Vapor Infiltration (CVI) process, infiltrating a ceramic slurry into the porous body or preform, conducting one or more secondary operations, and finally, melt infiltrating the preform with molten silicon or a silicon alloy to form the CMC article. The infiltration of a ceramic slurry into a ceramic fiber preform to form a green body is performed along with the use of convection and/or conduction as heat transfer mechanisms, such that the ceramic slurry does not require the incorporation of a pre-gelation material in order for the slurry to remain within the green body during subsequent processing steps.

公开(公告)号：US20210147303A1

公开(公告)日：2021-05-20

申请号：US17088897

申请日：2020-11-04

Applicant: Rolls-Royce High Temperature Composites Inc.

Inventor： Camila S. Bortoluzzi ,  Sungbo Shim ,  Pathikumar Sellappan

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

Abstract: A method of producing a CMC component that includes forming a preform having a plurality of ceramic fiber plies with each ply occupying a predetermined position; rigidizing the preform with a fiber interphase coating; inspecting the preform to determine which of the plies has partially or fully delaminated; reworking the delaminated plies in the preform; infiltrating a ceramic slurry into the preform to form a green body; optionally, conducting a secondary operation on the green body; and infiltrating the green body with a molten silicon or silicon alloy to form the CMC component. The step of reworking delaminated plies may also be applied to a green body formed after ceramic slurry infiltration into a rigidized fiber preform.