摘要:
A tackifier composition includes a carrier solvent, a resin material, and an inorganic filler. The tackifier composition may be deposited onto at least a portion of a woven fiber structure and then dried to remove the carrier solvent. The dried woven fiber structure may then be formed into a preform.
摘要:
A production process which comprises a preform formation step of forming a fiber preform made of silicon carbide short fibers having heat resistance of 1000° C. or greater; a sol-gel preparation step of preparing a sol-gel solution containing a heat resistant compound having heat resistance of 1000° C. or greater; an impregnation-drying-calcination step of impregnating the fiber preform with the sol-gel solution, followed by drying and calcining; and a crystallization step of crystallizing the fiber preform after impregnation, drying and calcination.
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 protective jacketing-insulation composite structure and method is provided for inhibiting the corrosion of a pipeline. The method includes forming a porous-insulation into an elongated-arcuate-shape, applying a sodium silicate solution layer to the insulation and at least partially within the pores thereof, permitting the sodium silicate solution layer to set to a threshold amount, adhering an outer facing to the sodium silicate solution layer after the permitting step is accomplished, installing the insulation and facing to the outer surface of a pipeline, and sealing any exposed edges or seams that may exist between multiple installed products. A structure such as made from this method can have a release layer and contact adhesive.
摘要:
An article such as a fan blade of a turbofan engine comprises a core made up of components at least some of which comprise packs of rods embedded in a resin matrix material. The rods extend in the span-wise direction of the blade to resist centrifugal forces imposed on the blade during operation. The core is encased in a skin-formed from preforms which may comprise fabric reinforcements.
摘要:
An impregnated fibrous veil comprises a nonwoven fibrous veil including a prebinder and reinforcing fibers. The reinforcing fibers are selected from a group consisting of glass fibers, ceramic fibers and mixtures thereof. The nonwoven fibrous veil has at least one face impregnated with a surface finish formulation. The surface finish formulation includes about 80 to about 98 weight percent filler, about 2 to about 20 weight percent binder and about 0 to about 1 weight percent optical brightener.
摘要:
A composite is described which has particular utility in the formation of components for gas turbine engines. The composite broadly comprises a substrate having a surface and at least one layer of a BN/Si3N4 coating on the substrate surface. The coating preferably is formed by alternative layers of a BN material and a Si3N4 material. The substrate may be a cloth material with fibers, such as SiC fibers, woven therein.
摘要翻译:描述了在形成燃气涡轮发动机的部件时特别有用的复合材料。 复合材料广泛地包括在基材表面上具有表面和至少一层BN / Si 3 N 4涂层的基材。 涂层优选由BN材料和Si 3 N 4材料的替代层形成。 衬底可以是其中编织有诸如SiC纤维的纤维的布料。
摘要:
A thermal protection paste as described herein can be used by itself, or impregnated into a high temperature resistant fabric to form a repair patch, to repair a thermal protection structure. The paste includes a ceramic composition that includes ceramic material having at least a first controlled particle size and a second controlled particle size that is larger than the first controlled particle size. The ceramic composition is mixed into a high temperature ceramic precursor resin to form the paste. The paste (or patch) is applied to the structure under repair and initially heated to cure the paste and to secure it in place. When the paste and/or patch is cured, it becomes a cross-linked polymer having high thermal protection characteristics. When the paste is exposed to very high temperature, e.g., spacecraft reentry temperatures, it pyrolizes and retains its high thermal protection characteristics.
摘要:
A protective jacketing-insulation composite structure and method is provided for inhibiting the corrosion of a pipeline. The method includes forming a porous-insulation into an elongated-arcuate-shape, applying a sodium silicate solution layer to the insulation and at least partially within the pores thereof, permitting the sodium silicate solution layer to set to a threshold amount, adhering an outer facing to the sodium silicate solution layer after the permitting step is accomplished, installing the insulation and facing to the outer surface of a pipeline, and sealing any exposed edges or seams that may exist between multiple installed products. A structure such as made from this method can have a release layer and contact adhesive.
摘要:
A composite sheet, and a process of making the same, including cured modified urea formaldehyde reinforced by glass fibers. The modifier is an acrylonitrile-butadiene-styrene copolymer. A roofing shingle, formed by coating the composite sheet with filled asphalt, represents a major application of the composite sheet.