摘要:
A composite article may include a matrix and a plurality of fibers embedded in the matrix. Each one of the fibers has a fiber length and a fiber geometry. The fiber geometry of at least a portion of the fibers may vary along the fiber length.
摘要:
A ceramic matrix composite with a ceramic matrix and a gradient layering of coating on ceramic fibers. The coating typically improves the performance of the composite in one direction while degrading it in another direction. For a SiC-SiC ceramic matrix composite, a BN coating is layered in a gradient fashion or in a step-wise fashion in different regions of the article comprising the ceramic. The BN coating thickness is applied over the ceramic fibers to produce varying desired physical properties by varying the coating thickness within differing regions of the composite, thereby tailoring the strength of the composite in the different regions. The coating may be applied as a single layer as a multi-layer coating to enhance the performance of the coating as the ceramic matrix is formed or infiltrated from precursor materials into a preform of the ceramic fibers.
摘要:
A composite structure includes at least one resin matrix layer having a resin material and a plurality of fiber elements and a plurality of titanium particles provided in the resin material. A method of toughening a resin matrix layer is also disclosed.
摘要:
A method for making a variable-density carbon nanotube film is provided. A drawn carbon nanotube film, including a number of carbon nanotubes aligned along an aligned direction, is prepared. A number of thin regions are formed in the drawn carbon nanotube film along the aligned direction by reducing density of carbon nanotubes in each of the plurality of thin regions. A variable-density carbon nanotube film is provided and includes a number of thin regions and at least one normal region having a density of carbon nanotubes greater than that of the thin regions. The at least one normal region includes a number of carbon nanotubes substantially aligned along an aligned direction. The thin regions are arranged in the form of at least one row extending along the aligned direction.
摘要:
A carbon-fiber-reinforced SiC composite having a high tensile strength is produced by impregnating a carbon-fiber-reinforced carbon composite with melted metal Si. The carbon-fiber-reinforced carbon composite includes carbon fibers that are pitch-based short carbon fibers. The pitch-based short carbon fibers are oriented in two-dimensional random directions. The carbon-fiber-reinforced carbon composite has a bulk density of 1.2 to 1.7 g/cm3, a porosity of 15 to 40 vol %, and a carbon fiber volume content of 20 to 50 vol %.
摘要翻译:通过用熔融的金属Si浸渍碳纤维增强的碳复合材料来制造具有高拉伸强度的碳纤维增强的SiC复合材料。 碳纤维增强碳复合材料包括作为沥青类短碳纤维的碳纤维。 基于沥青的短碳纤维以二维随机方向取向。 碳纤维增强碳复合材料的堆积密度为1.2〜1.7g / cm 3,孔隙率为15〜40体积%,碳纤维体积含量为20〜50体积%。
摘要:
A composite material according to the present invention includes: a fiber fabric (2) composed of certain fibers; and a matrix (3) which is so formed as to adhere to the fiber fabric (2). The fiber fabric (2) contains main constitutional fibers (21) and auxiliary fibers (22) which compensate the characteristics of the main constitutional fibers (21) when they are exposed to a high temperature atmosphere.
摘要:
Penetration resistant composites and articles that are lightweight and ultraviolet light stable. One penetration resistant composite has a plate and a plurality of fibrous layers disposed adjacent at least one major surface of the plate. At least one of the fibrous layers includes a polymer fiber that is ultraviolet light stable. The composite has an areal density of less than about 25 kilograms per square meter, and is non-penetratable in accordance with standard NIJ-0101.04 level III dated September 2000.
摘要:
A hybrid ceramic matrix composite (CMC) structure 10 and method for fabricating such an structure are provided. A CMC substrate 12 includes layers 16, 18, 20 of ceramic fibers. Fugitive objects 22 are disposed on at least one of the plurality of layers prior to laying a subsequent layer of ceramic fibers. An outer surface of the subsequent layer influences a shape of the outer surface of the substrate by defining protuberances 24 on the outer surface of the substrate where respective cavities 26 are formed beneath respective protuberances upon dissipation of the fugitives. A liquefied ceramic coating 34 is deposited on the outer surface of the ceramic substrate to fill the cavities. When the ceramic coating is cured to a solidified state, the cavities containing the solidified coating constitute an anchoring arrangement between the ceramic substrate and the ceramic coating.
摘要:
Disclosed are structural materials including polymeric reinforcment fibers that can provide added strength and fracture toughness to the matrix. The polymeric reinforcement fibers are polypropylene-based monofilament fibers or tape fibers exhibiting extremely favorable mechanical characteristics for structural reinforcement including modulus greater than 12 MPa and elongation less than about 10%. The disclosed reinforced composite materials can exhibit desired average residual strength values with less total fiber loading necessary to attain the ARS values as compared to previously known polymer reinforced materials. Very high strength and fracture toughness can be attained in the disclosed composite materials.
摘要:
A panel is provided having a surface layer. The surface layer includes a surface that is the exterior surface of the panel. The surface layer includes a blend of nucleated binder fibers and synthetic fibers and forms a finishable, substantially defect and porosity free surface layer based on visual inspection.