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    METHOD TO PROCESS A CERAMIC MATRIX COMPOSITE (CMC) WITH A PROTECTIVE CERAMIC COATING
    153.
    发明申请
    METHOD TO PROCESS A CERAMIC MATRIX COMPOSITE (CMC) WITH A PROTECTIVE CERAMIC COATING 有权

    公开(公告)号：US20210230071A1

    公开(公告)日：2021-07-29

    申请号：US17229154

    申请日：2021-04-13

    Applicant: Rolls-Royce High Temperature Composites Inc.

    Inventor： Sungbo Shim

    IPC: C04B35/515 ,  C04B41/00 ,  C04B35/76 ,  C04B35/573 ,  B32B18/00 ,  C04B41/52 ,  C04B41/89 ,  C04B35/565 ,  C04B38/06 ,  C04B35/571

    Abstract: A method of producing a ceramic matrix composite including a protective ceramic coating thereon comprises applying a surface slurry onto an outer surface of an impregnated fiber preform. The surface slurry includes particulate ceramic solids dispersed in a flowable preceramic polymer comprising silicon, and the impregnated fiber preform comprises a framework of ceramic fibers loaded with particulate matter. The flowable preceramic polymer is cured, thereby forming on the outer surface a composite layer comprising a cured preceramic polymer with the particulate ceramic solids dispersed therein. The cured preceramic polymer is then pyrolyzed to form a porous ceramic layer comprising silicon carbide, and the impregnated fiber preform and the porous ceramic layer are infiltrated with a molten material comprising silicon. After infiltration, the molten material is cooled to form a ceramic matrix composite body with a protective ceramic coating thereon.

    METHOD OF ALTERING A SURFACE OF A CERAMIC MATRIX COMPOSITE TO AID IN NODULE REMOVAL
    155.
    发明申请
    METHOD OF ALTERING A SURFACE OF A CERAMIC MATRIX COMPOSITE TO AID IN NODULE REMOVAL 有权

    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.

    Forming a surface layer on a ceramic matrix composite article
    157.
    发明授权
    Forming a surface layer on a ceramic matrix composite article 有权

    公开(公告)号：US10774010B2

    公开(公告)日：2020-09-15

    申请号：US15499946

    申请日：2017-04-28

    Applicant: Rolls-Royce High Temperature Composites, Inc.

    Inventor： Sungbo Shim ,  Andrew Joseph Lazur ,  Robert Shinavski

    IPC: C04B41/00 ,  C04B41/89 ,  C04B41/52 ,  C04B35/80 ,  F01D5/28 ,  B05D7/24 ,  B05D3/00 ,  B05D7/22

    Abstract: Techniques for infiltrating a CMC substrate may include infiltrating the CMC substrate with a first slurry to at least partially fill at least some inner spaces of the CMC substrate, where the first slurry includes first solid particles, drying the first slurry to form an infiltrated CMC including the first solid particles, depositing a second slurry including a carrier material and second solid particles on a surface of the infiltrated CMC, where the second solid particles include a plurality of fine ceramic particles, a plurality of coarse ceramic particles, and a plurality of diamond particles, drying the second slurry to form an article having an outer surface layer including the second solid particles on the infiltrated CMC, and infiltrating the article with a molten infiltrant to form a composite article.

    Combustor tile with monolithic inserts
    158.
    发明授权
    Combustor tile with monolithic inserts 有权

    公开(公告)号：US10767863B2

    公开(公告)日：2020-09-08

    申请号：US15217444

    申请日：2016-07-22

    Applicant: Rolls-Royce North American Technologies Inc. ,  Rolls-Royce Corporation ,  Rolls-Royce High Temperature Composites Inc.

    Inventor： Ted Joseph Freeman ,  Bruce E. Varney ,  Andrew Joseph Lazur

    IPC: F23R3/00 ,  F01D9/04 ,  F23M5/04

    Abstract: An annular assembly for a gas turbine engine and a method of making the annular assembly. The annular assembly comprises a supporting member comprising metal and including a support hole therethrough, and a liner tile made of ceramic matrix composite material. A plurality of the liner tile form an annular liner to shield hot combustion gases produced by the gas turbine engine. The liner tile is disposed adjacent the supporting member. A connecting member comprising ceramic material has a base element and a stem. The base element is embedded in the liner tile during construction of the liner tile to form an integrated structure therewith. A distal end of the stem passes through the support hole and is mated with a retaining member to retain the liner tile adjacent the supporting member.

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