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    CERAMIC MATRIX COMPOSITES HAVING MONOMODAL PORE SIZE DISTRIBUTION AND LOW FIBER VOLUME FRACTION
    1.
    发明申请
    CERAMIC MATRIX COMPOSITES HAVING MONOMODAL PORE SIZE DISTRIBUTION AND LOW FIBER VOLUME FRACTION 审中-公开

    公开(公告)号：US20180093926A1

    公开(公告)日：2018-04-05

    申请号：US15831896

    申请日：2017-12-05

    Applicant: GENERAL ELECTRIC COMPANY

    Inventor： Gregory Scot CORMAN ,  Jared Hogg WEAVER ,  Krishan Lal LUTHRA

    IPC: C04B35/76 ,  F01D5/28 ,  C04B38/06 ,  F01D9/02 ,  C04B35/626 ,  C04B35/80

    Abstract: Ceramic matrix composite articles include, for example, a plurality of unidirectional arrays of fiber tows in a matrix having a monomodal pore size distribution, and a fiber volume fraction between about 15 percent and about 35 percent. The articles may be formed by, for example, providing a shaped preform comprising a prepreg tape layup of unidirectional arrays of fiber tows, a matrix precursor, and a pore former, curing the shaped preform to pyrolyze the matrix precursor and burnout the pore former so that the shaped preform comprises the unidirectional arrays of fiber tows and a porous matrix having a monomodal pore size distribution, and subjecting the cured shaped preform to chemical vapor infiltration to densify the porous matrix so that the ceramic matrix composite article has a fiber volume fraction between about 15 percent and about 35 percent.

    UNIFORMITY OF FIBER SPACING IN CMC MATERIALS
    2.
    发明申请
    UNIFORMITY OF FIBER SPACING IN CMC MATERIALS 审中-公开
    CMC材料中纤维间距的均匀性

    公开(公告)号：US20170029339A1

    公开(公告)日：2017-02-02

    申请号：US14813271

    申请日：2015-07-30

    Applicant: General Electric Company

    Inventor： Jared Hogg WEAVER ,  Gregory Scot CORMAN ,  Daniel Gene DUNN

    IPC: C04B35/565 ,  B05D7/24

    CPC classification number: C04B35/565 ,  B05D7/24 ,  C04B35/80 ,  C04B35/806 ,  C04B2235/422 ,  C04B2235/5244 ,  C04B2235/5264 ,  C04B2235/54 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/616

    Abstract: A pliable tape is generally provided that includes: a plurality of fibers forming unidirectional arrays of tows encased within a matrix material, with four adjacent fibers in the tape define an interstitial spacing therebetween. The matrix material comprises filler particles dispersed between adjacent fibers in the tape. In one embodiment, the filler particles have a median particle size defining the interstitial spacing such that the interstitial spacing is about 0.75 to about 1.1 of the median particle size. In another embodiment, the filler particles have a median particle size that is related to the surface-to-surface spacing between adjacent fibers, with the ratio of the surface-to-surface spacing between adjacent fibers and the median particle size being about 0.3:1 to about 1:1. Methods are also provided for forming a ceramic matrix composite.

    Abstract translation: 通常提供柔韧的带，其包括：多个纤维，其形成包围在基质材料内的纤维束的单向阵列，带中的四个相邻的纤维限定其间的间隙。 基质材料包括分散在带中的相邻纤维之间的填料颗粒。 在一个实施方案中，填料颗粒具有限定间隙间距的中值粒度，使得间隙间距为中值粒度的约0.75至约1.1。 在另一个实施方案中，填料颗粒具有与相邻纤维之间的表面到表面间隔相关的中值粒度，相邻纤维之间的表面与表面间隔的比率与中值粒径之比为约0.3： 1至约1：1。 还提供了形成陶瓷基质复合材料的方法。

    SEAL COATS TO PREVENT SILICON LOSS DURING RE-MELT INFILTRATION OF SI CONTINING COMPOSITES
    6.
    发明申请
    SEAL COATS TO PREVENT SILICON LOSS DURING RE-MELT INFILTRATION OF SI CONTINING COMPOSITES 审中-公开

    公开(公告)号：US20180037513A1

    公开(公告)日：2018-02-08

    申请号：US15228693

    申请日：2016-08-04

    Applicant: GENERAL ELECTRIC COMPANY

    Inventor： Daniel Gene DUNN ,  Gregory Scot CORMAN ,  Jared Hogg WEAVER

    IPC: C04B37/00 ,  F01D5/00 ,  F01D5/28 ,  C23C16/32 ,  F23R3/00

    Abstract: Provided is a method including obtaining ceramic matrix composite (CMC) with a first matrix portion including a silicon carbide and silicon phase dispersed therewithin, disposing a coating thereupon to form a sealed part, and forming thereupon another segment comprising a CMC, which may be another matrix portion including a silicon carbide and a silicon phase dispersed within therewithin. Also provided is a gas turbine component with a CMC segment including a matrix portion including a silicon carbide and a silicon phase dispersed therewithin, a sealing layer including silicon carbide enclosing the first segment, and a second segment on the sealing layer, wherein the second segment includes a melt-infiltrated CMC having a matrix portion including a silicon carbide and a silicon phase dispersed therewithin.

    UNIFORMITY OF FIBER SPACING IN CMC MATERIALS
    7.
    发明申请
    UNIFORMITY OF FIBER SPACING IN CMC MATERIALS 审中-公开
    CMC材料中纤维间距的均匀性

    公开(公告)号：US20170029340A1

    公开(公告)日：2017-02-02

    申请号：US14813239

    申请日：2015-07-30

    Applicant: General Electric Company

    Inventor： Jared Hogg WEAVER ,  Gregory Scot CORMAN ,  Daniel Gene DUNN

    IPC: C04B35/76 ,  B29C70/02

    CPC classification number: C04B35/76 ,  B29C70/025 ,  B29L2031/00 ,  C04B35/80 ,  C04B35/806 ,  C04B35/83 ,  C04B2235/32 ,  C04B2235/3826 ,  C04B2235/421 ,  C04B2235/422 ,  C04B2235/48 ,  C04B2235/5244 ,  C04B2235/5264 ,  C04B2235/5268 ,  C04B2235/54 ,  C04B2235/5436 ,  C04B2235/614 ,  C04B2235/616

    Abstract: A pre-impregnated composite tape is provided that includes: a matrix material; a plurality of fibers forming unidirectional arrays of tows encased within the matrix material; and a plurality of filler particles dispersed between adjacent fibers in the tape. The fibers have a mean fiber diameter of about 5 microns and about 40 microns, and are included within the tape at a volume fraction of about 15% and about 40%. The plurality of filler particles have a log-normal volumetric median particle size, such that the tape has a ratio of the log-normal volumetric median particle size to the mean fiber diameter that is about 0.05:1 to about 1:1. A method is also provided for forming a ceramic matrix composite.

    Abstract translation: 提供预浸渍复合胶带，其包括：基质材料; 多个纤维，其形成包含在基质材料内的丝束的单向阵列; 以及分散在带中的相邻纤维之间的多个填料颗粒。 纤维的平均纤维直径为约5微米至约40微米，并且以约15％至约40％的体积分数包含在带内。 多个填料颗粒具有对数正态体积中值粒径，使得带具有对数正态体积中值粒径与平均纤维直径的比例为约0.05:1至约1:1。 还提供了一种用于形成陶瓷基质复合材料的方法。

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