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    High temperature electromagnetic radiation absorbent material and method for manufacturing the same
    54.
    发明授权
    High temperature electromagnetic radiation absorbent material and method for manufacturing the same 失效
    高温电磁辐射吸收材料及其制造方法

    公开(公告)号：US5935679A

    公开(公告)日：1999-08-10

    申请号：US876541

    申请日：1997-06-09

    申请人： Robert A. Petrisko ,  Gary Lee Stark ,  Daniel R. Petrak ,  Richard E. Jones

    发明人： Robert A. Petrisko ,  Gary Lee Stark ,  Daniel R. Petrak ,  Richard E. Jones

    IPC分类号： B01D15/00 ,  B01D53/02 ,  B01J20/20 ,  B01J20/28 ,  B32B9/00

    CPC分类号： B01J20/2803 ,  B01D15/00 ,  B01D53/02 ,  B01J20/20 ,  B01J20/28009 ,  B01J20/28023 ,  B01J20/28028 ,  B01J20/28045 ,  Y10T428/24149 ,  Y10T442/2975

    摘要： Conductive and/or chemically absorptive ceramic fibers are woven with optional non-conductive/non-absorptive ceramic fibers to create a fiber reinforcement which is impregnated with a ceramic-material-producing (pre-ceramic polymer) binder and heated to create the ceramic honeycomb with controlled ohmic loss and/or chemical absorption properties. The desired properties of the honeycomb material can be provided by the conductive and/absorptive ceramic fibers alone or in combination with non-fibrous or fibrous conductive and/or absorptive ceramic material provided by the binder, typically a preceramic polymer which may or may not contain dispersed ceramic materials; after the honeycomb is formed, the non-fibrous or fibrous conductive and/or absorptive ceramic material is interspersed throughout the honeycomb. By heating the impregnated fiber reinforcement in the absence of oxygen, carbon from any carbon-containing materials within the binder remain as a part of the honeycomb material. The honeycomb can be loaded with additional carbon or carbon-containing fibers by repeating the loading and heating in the absence of oxygen steps. For applications requiring long-term thermo-oxidative resistance, refractory ceramics like pure silicon carbide can be substituted for the fibers or fillers employed.

    摘要翻译： 导电和/或化学吸收陶瓷纤维用可选的非导电/非吸收性陶瓷纤维编织，以产生纤维增强物，其被陶瓷材料生产（预陶瓷聚合物）粘合剂浸渍并加热以产生陶瓷蜂窝体 具有受控的欧姆损失和/或化学吸收性能。 蜂窝材料的所需性能可以由导电和/或吸收性陶瓷纤维单独提供，或与由粘合剂提供的非纤维或纤维状导电和/或吸收性陶瓷材料组合提供，通常为可以含或不含有 分散陶瓷材料; 在形成蜂窝体之后，非纤维状或纤维状的导电和/或吸收性陶瓷材料穿过整个蜂窝体。 通过在不存在氧的情况下加热浸渍的纤维增强材料，粘合剂中任何含碳材料的碳残留作为蜂窝材料的一部分。 通过在不存在氧气步骤的情况下重复加载和加热，蜂窝体可以加载额外的碳或含碳纤维。 对于需要长期耐热氧化性的应用，像纯碳化硅这样的耐火陶瓷可以代替所用的纤维或填料。

    Fibrous composites including monazites and xenotimes
    56.
    发明授权
    Fibrous composites including monazites and xenotimes 失效
    纤维复合材料包括独居石和异型材

    公开(公告)号：US5665463A

    公开(公告)日：1997-09-09

    申请号：US592155

    申请日：1996-01-26

    申请人： Peter E. D. Morgan ,  David B. Marshall

    发明人： Peter E. D. Morgan ,  David B. Marshall

    IPC分类号： C04B35/447 ,  C04B35/80 ,  B32B7/00

    CPC分类号： C04B35/447 ,  C04B35/803 ,  Y10T428/2933 ,  Y10T428/294 ,  Y10T428/2958 ,  Y10T442/2361 ,  Y10T442/2975 ,  Y10T442/3659 ,  Y10T442/488 ,  Y10T442/67

    摘要： Thermodynamically stable ceramic composites are provided for use in high temperature reactive environments. A phosphate selected from monazites and xenotimes functions as a weak bond material in the composite. Monazite comprises a family of minerals having the form MPO.sub.4, where M is selected from the larger trivalent rare earth elements of the lanthanide series (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, and Tb) and coupled substituted divalents and tetravalents such as Ca or Sr with Zr or Th. Xenotimes are phosphates similar to monazite where M is selected from Sc, Y, and the smaller trivalent rare earth elements of the lanthanide series (Dy, Ho, Er, Tm, Yb, and Lu). High temperature ceramic composites that include monazite or xenotime and exhibit damage tolerant behavior or non-catastrophic fracture may be fabricated in a variety of material systems and reinforcement morphologies, including multilayered laminar composites; fiber, whisker, and particulate reinforced composites; hybrid laminar composites; and fabric or fiber preform composites. In preferred embodiments, the ceramic matrix comprises a material similar to the reinforcement to improve compatibility of the composite materials. The weak bond material allows debonding and "frictional" sliding between the constituents of the composite and inhibits crack growth across the interface.

    摘要翻译： 提供热力学稳定的陶瓷复合材料用于高温反应性环境。 选自独居石和硝酸盐的磷酸盐在复合材料中起到弱键材料的作用。 独居石包括具有MPO4形式的矿物族，其中M选自镧系（La，Ce，Pr，Nd，Pm，Sm，Eu，Gd和Tb）的较大的三价稀土元素和偶联的取代的二价 和四价体如Ca或Sr与Zr或Th。 Xenotimes是类似于独居石的磷酸盐，其中M选自Sc，Y，以及镧系（Dy，Ho，Er，Tm，Yb和Lu）中较小的三价稀土元素。 包括独居石或堇青石并具有损伤容忍行为或非灾难性断裂的高温陶瓷复合材料可以在各种材料体系和增强形态中制造，包括多层层状复合材料; 纤维，晶须和颗粒增强复合材料; 混合层流复合材料; 织物或纤维预制件复合材料。 在优选的实施方案中，陶瓷基质包括类似于增强材料以改善复合材料的相容性的材料。 弱粘合材料允许复合材料的组分之间的剥离和“摩擦”滑动并且抑制在界面上的裂纹扩展。

    Toughened ceramic composite materials comprising coated refractory fibers in a ceramic matrix wherein the fibers are coated with carbon and an additional coating of ceramic material and carbon mixture
    59.
    发明授权
    Toughened ceramic composite materials comprising coated refractory fibers in a ceramic matrix wherein the fibers are coated with carbon and an additional coating of ceramic material and carbon mixture 失效
    在陶瓷基体中包含涂覆耐火纤维的增韧陶瓷复合材料，其中所述纤维涂覆有碳和另外的陶瓷材料和碳混合物涂层

    公开(公告)号：US5480707A

    公开(公告)日：1996-01-02

    申请号：US132671

    申请日：1993-10-06

    申请人： Wayne S. Steffier

    发明人： Wayne S. Steffier

    IPC分类号： C04B35/565 ,  C04B35/628 ,  C04B35/80 ,  D03D3/00 ,  C04B35/03 ,  C04B35/52

    CPC分类号： C04B35/62873 ,  C04B35/565 ,  C04B35/6286 ,  C04B35/62863 ,  C04B35/62884 ,  C04B35/62897 ,  C04B35/806 ,  C04B2235/5224 ,  C04B2235/5244 ,  C04B2235/5248 ,  C04B2235/5268 ,  C04B2235/77 ,  C04B2235/96 ,  Y10S428/902 ,  Y10T428/2938 ,  Y10T442/2148 ,  Y10T442/2557 ,  Y10T442/2975 ,  Y10T442/3528 ,  Y10T442/59

    摘要： A fiber reinforced ceramic composite material exhibiting high tensile strength, high fracture toughness and high-temperature oxidation resistance is produced by simultaneously depositing a thin coating layer of refractory metal carbide with fugitive carbon onto the fiber reinforcement prior to the subsequent densification with the ceramic matrix. The energy behind propagating matrix cracks in the resulting composite material are effectively dissipated by crack deflection/branching, fiber debonding and frictional slip through the relatively weak and compliant fiber coating layer. These energy release and arrest mechanisms sufficiently impede the driving force behind unstable crack propagation and render the cracks non-critical, thereby serving to blunt and/or divert propagating matrix cracks at or around the reinforcing fiber. While significantly increasing the strength and fracture toughness of the composite, the compliant refractory fiber coating system enables the composite to remain oxidatively stable when stressed at or beyond the matrix cracking stress point and subsequently exposed to temperatures above 800.degree. C. in air.

    摘要翻译： 通过在随后用陶瓷基体致密化之前，同时在纤维增强层上沉积具有耐火金属碳化物的薄涂层，将耐火金属碳化物的薄涂层同时沉积在纤维增强体上，形成显示出高拉伸强度，高断裂韧性和高温抗氧化性的纤维增强陶瓷复合材料。 所得复合材料中传播的基体裂纹后的能量通过裂纹偏转/分支，纤维脱粘和摩擦滑移有效地消散，通过相对较弱且柔顺的纤维涂层。 这些能量释放和阻止机制充分阻碍了不稳定裂纹扩展后的驱动力，使裂纹非关键，从而在增强纤维或其附近钝化和/或转移传播的基质裂纹。 同时显着提高复合材料的强度和断裂韧性，柔性耐火纤维涂层系统使复合材料在受到基体裂纹应力点应力或超过基体裂纹应力点时保持氧化稳定性，随后在空气中暴露于高于800℃的温度。

    Multilayer fiber coating comprising alternate fugitive carbon and ceramic coating material for toughened ceramic composite materials
    60.
    发明授权
    Multilayer fiber coating comprising alternate fugitive carbon and ceramic coating material for toughened ceramic composite materials 失效
    多层纤维涂层，包括用于增韧陶瓷复合材料的交替的短暂碳和陶瓷涂层材料

    公开(公告)号：US5455106A

    公开(公告)日：1995-10-03

    申请号：US132524

    申请日：1993-10-06

    申请人： Wayne S. Steffier

    发明人： Wayne S. Steffier

    IPC分类号： C04B35/628 ,  C04B35/80 ,  D03D3/00 ,  C04B35/03 ,  C04B35/08 ,  D02G3/00

    CPC分类号： C04B35/62873 ,  C04B35/565 ,  C04B35/62863 ,  C04B35/62884 ,  C04B35/62897 ,  C04B35/806 ,  C04B2235/5224 ,  C04B2235/5244 ,  C04B2235/5248 ,  C04B2235/5268 ,  C04B2235/614 ,  C04B2235/77 ,  C04B2235/96 ,  Y10S428/902 ,  Y10T428/2938 ,  Y10T442/2107 ,  Y10T442/2557 ,  Y10T442/2975

    摘要： A fiber-reinforced ceramic-matrix composite material exhibiting high tensile strength, high fracture toughness and high-temperature oxidation resistance is produced by alternatively depositing multiple thin layers of ceramic material separated by very thin intermediate layers of fugitive carbon onto the fiber reinforcement prior to the subsequent densification with the ceramic matrix. The energy behind propagating matrix cracks in the resulting composite material are effectively dissipated by the progressive increase in crack deflection/branching and frictional slip through the successive ceramic layers of the multilayer fiber coating system. These energy release and arrest mechanisms sufficiently impede the driving force behind unstable crack propagation and render the cracks non-critical, thereby serving to blunt and/or divert propagating matrix cracks at or around the reinforcing fiber. While significantly increasing the strength and fracture toughness of the composite, the multilayer refractory fiber coating system enables the composite to remain oxidatively stable when stressed at or beyond the matrix cracking stress point and subsequently exposed to temperatures above 800.degree. C. in air.

    摘要翻译： 通过交替地将由非常薄的中间层的缓冲性碳分离的多个陶瓷材料薄层交替地沉积到纤维增强材料之前，形成具有高拉伸强度，高断裂韧性和高温抗氧化性的纤维增强陶瓷基复合材料 随后用陶瓷基体致密化。 通过多层纤维涂层系统的连续陶瓷层的裂纹偏转/分支和摩擦滑移的逐渐增加，所得复合材料中传播的基体裂纹的能量被有效地消散。 这些能量释放和阻止机制充分阻碍了不稳定裂纹扩展后的驱动力，使裂纹非关键，从而在增强纤维或其附近钝化和/或转移传播的基质裂纹。 同时显着提高复合材料的强度和断裂韧性，多层耐火纤维涂层系统能够使复合材料在基体裂纹应力点或以上受应力时保持氧化稳定性，随后在空气中暴露于高于800℃的温度。