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1
US10201924B2
Publication/Patent Number: US10201924B2
Publication date: 2019-02-12
Application number: 15/911,670
Filing date: 2018-03-05
Inventor: Grabe, Norman  
Abstract: A method produces a polysilane by reacting at least two silane monomers and at least one alkali metal. The silane monomers have the following structural units: at least one aryl group, at least one alkyl group, at least one alkenyl group, and at least three halogen atoms. Wherein at least three of the halogen atoms are bonded to a silicon atom of one of the silane monomers, and the reaction step takes place in an ether-containing solvent, particularly preferably dioxane. The obtained polysilane has a high molecular mass and, at 100° C., a viscosity of 1,500 to 3,000 Pa·s. The polysilane is very suitable for being processed to form silicon carbide fibers and fiber composites. A method produces a polysilane by reacting at least two silane monomers and at least one alkali metal. The silane monomers have the following structural units: at least one aryl group, at least one alkyl group, at least one alkenyl group, and at least three halogen atoms ...more ...less
2
US20190066913A1
Publication/Patent Number: US20190066913A1
Publication date: 2019-02-28
Application number: 15/692,037
Filing date: 2017-08-31
Abstract: An electromagnetic coil with improved insulation properties at high temperatures. A bobbin is insulated by a thin ceramic composite layer that is produced by winding a glass or ceramic fiber over the support structure and impregnating it with a pre-ceramic polymer. The pre-ceramic polymer is then modified to form a ceramic SiO2 matrix around the fibrous layer. The ceramic matrix secures the glass or ceramic fibers in place and produces a dense layer. A ceramic coated magnet wire is then wound around the insulated support structure. The magnet wire is a conductor that is spiral-wrapped with a glass fiber impregnated with a pre-ceramic polymer. An electromagnetic coil with improved insulation properties at high temperatures. A bobbin is insulated by a thin ceramic composite layer that is produced by winding a glass or ceramic fiber over the support structure and impregnating it with a pre-ceramic polymer. The ...more ...less
3
US20190071363A1
Publication/Patent Number: US20190071363A1
Publication date: 2019-03-07
Application number: 15/696,869
Filing date: 2017-09-06
Abstract: The present disclosure relates to a method of fabricating a ceramic composite components. The method may include providing at least a first layer of reinforcing fiber material which may be a pre-impregnated fiber. An additively manufactured component may be provided on or near the first layer. A second layer of reinforcing fiber, which may be a pre-impregnated fiber may be formed on top the additively manufactured component. A precursor is densified to consolidates at least the first and second layer into a densified composite, wherein the additively manufactured material defines at least one cooling passage in the densified composite component. The present disclosure relates to a method of fabricating a ceramic composite components. The method may include providing at least a first layer of reinforcing fiber material which may be a pre-impregnated fiber. An additively manufactured component may be provided on or near ...more ...less
4
US20190002356A1
Publication/Patent Number: US20190002356A1
Publication date: 2019-01-03
Application number: 15/744,011
Filing date: 2016-07-04
Abstract: The invention relates to an improved method for producing silica aerogel in pure and flexible sheet form having effective suppression of radiative heat transport at high temperatures and increased thermal insulation property. The suppression of radiative heat transport was achieved by in-situ production of titanium dioxide nanoparticles in very minor concentrations during gelation of silica precursor, with nanoporous surface area more than 300 m2/g and acts as an infra red reflecting agent. When aerogel is subjected to heat during hot object insulation, it automatically turn into infra red reflecting material. Said silica aerogel can be incorporated into the inorganic fibre mat matrix individually or into two or more layers with organic sponge sheet placed in between and stitched together to form a sandwich sheet to form highly insulating flexible sheet. The invention relates to an improved method for producing silica aerogel in pure and flexible sheet form having effective suppression of radiative heat transport at high temperatures and increased thermal insulation property. The suppression of radiative heat transport was ...more ...less
5
US20190072144A1
Publication/Patent Number: US20190072144A1
Publication date: 2019-03-07
Application number: 16/183,404
Filing date: 2018-11-07
Abstract: A method of making a ceramic matrix composite (CMC) brake component may include the steps of applying a pressure to a mixture comprising ceramic powder and chopped fibers, pulsing an electrical discharge across the mixture to generate a pulsed plasma between particles of the ceramic powder, increasing a temperature applied to the mixture using direct heating to generate the CMC brake component, and reducing the temperature and the pressure applied to the CMC brake component. The ceramic powder may have a micrometer powder size or a nanometer powder size, and the chopped fibers may have an interphase coating. A method of making a ceramic matrix composite (CMC) brake component may include the steps of applying a pressure to a mixture comprising ceramic powder and chopped fibers, pulsing an electrical discharge across the mixture to generate a pulsed plasma between particles of the ...more ...less
6
US20190010091A1
Publication/Patent Number: US20190010091A1
Publication date: 2019-01-10
Application number: 16/129,845
Filing date: 2018-09-13
Abstract: A three-dimensional (3D) printing composition includes ceramic filaments comprising an additive having an aspect ratio of at least 2:1. 3D printed ceramic articles include the ceramic filaments.
7
US20190062222A1
Publication/Patent Number: US20190062222A1
Publication date: 2019-02-28
Application number: 16/101,730
Filing date: 2018-08-13
Abstract: A method and apparatus for forming a plurality of fibers from (e.g., CVD) precursors, including a reactor adapted to grow a plurality of individual fibers; and a plurality of independently controllable lasers, each laser of the plurality of lasers growing a respective fiber. A high performance fiber (HPF) structure, including a plurality of fibers arranged in the structure; a matrix disposed between the fibers; wherein a multilayer coating is provided along the surfaces of at least some of the fibers with an inner layer region having a sheet-like strength; and an outer layer region, having a particle-like strength, such that any cracks propagating toward the outer layer from the matrix propagate along the outer layer and back into the matrix, thereby preventing the cracks from approaching the fibers. A method of forming an interphase in a ceramic matrix composite material having a plurality of SiC fibers, which maximizes toughness by minimizing fiber to fiber bridging, including arranging a plurality of SiC fibers into a preform; selectively removing (e.g., etching) silicon out of the surface of the fibers resulting in a porous carbon layer on the fibers; and replacing the porous carbon layer with an interphase layer (e.g., Boron Nitride), which coats the fibers to thereby minimize fiber to fiber bridging in the preform. A method and apparatus for forming a plurality of fibers from (e.g., CVD) precursors, including a reactor adapted to grow a plurality of individual fibers; and a plurality of independently controllable lasers, each laser of the plurality of lasers growing a respective fiber. A ...more ...less
8
US20190039122A1
Publication/Patent Number: US20190039122A1
Publication date: 2019-02-07
Application number: 16/157,941
Filing date: 2018-10-11
Abstract: A method to form a displacement includes disposing a powder blend (comprising a plurality of ground ceramic particles and a plurality of ground resin particles) into a mold, densifying the powder blend while in the mold, heating the mold to form a first displacement, impregnating said first displacement with a polymer precursor compound to form a second displacement, and heating the second displacement to form a third displacement. A method to form a displacement includes disposing a powder blend (comprising a plurality of ground ceramic particles and a plurality of ground resin particles) into a mold, densifying the powder blend while in the mold, heating the mold to form a first displacement ...more ...less
9
US20190031569A1
Publication/Patent Number: US20190031569A1
Publication date: 2019-01-31
Application number: 15/985,701
Filing date: 2018-05-22
Inventor: Steibel, James Dale  
Abstract: A ceramic matrix composite article includes a melt infiltration ceramic matrix composite substrate comprising a ceramic fiber reinforcement material in a ceramic matrix material having a first free silicon proportion, and a melt infiltration ceramic matrix composite outer layer comprising a ceramic fiber reinforcement material in a ceramic matrix material having a second free silicon proportion disposed on an outer surface of at least a portion of the substrate, or a polymer impregnation and pyrolysis ceramic matrix composite outer layer comprising a ceramic fiber reinforcement material in a ceramic matrix material having a second free silicon proportion disposed on an outer surface of at least a portion of the substrate. The second free silicon proportion is less than the first free silicon proportion. A ceramic matrix composite article includes a melt infiltration ceramic matrix composite substrate comprising a ceramic fiber reinforcement material in a ceramic matrix material having a first free silicon proportion, and a melt infiltration ceramic matrix composite outer layer ...more ...less
11
EP3421233A1
Publication/Patent Number: EP3421233A1
Publication date: 2019-01-02
Application number: 18177120.5
Filing date: 2018-06-11
Abstract: Ply layups (102) and methods for forming composite components (112) are provided. For example, a method for forming a composite component (112) comprises laying up a plurality of composite plies (100) to form a composite ply layup (102); partially processing the composite ply layup (102) to form a green state layup (104); machining the green state layup (104); assembling the green state layup (104) with one or more sub-assemblies (108); and processing the green state layup (104) and the one or more sub-assemblies (104, 108, 114, 116) to form the composite component (112). In an exemplary embodiment, the composite component is a turbine nozzle airfoil (112). Another exemplary method comprises laying up a plurality of composite plies (100) to form a composite ply layup (102); compacting the composite ply layup (102) to form a green state layup (104); machining the green state layup (104); assembling the green state layup (104) with one or more sub-assemblies (108); and processing the green state layup (104) and the one or more sub-assemblies (104, 108, 114, 116) to form the composite component. Ply layups (102) and methods for forming composite components (112) are provided. For example, a method for forming a composite component (112) comprises laying up a plurality of composite plies (100) to form a composite ply layup (102); partially processing the composite ply ...more ...less
12
EP3431459A1
Publication/Patent Number: EP3431459A1
Publication date: 2019-01-23
Application number: 18174003.6
Filing date: 2018-05-24
Abstract: Ein Verfahren zum Herstellen eines Faserverbundwerkstoffs, umfassend: (i) Bereitstellen eines Granulats, das Polymer und Fasern umfasst, (ii) Herstellen eines Vorkörpers aus dem Granulat, (iii) Pyrolysieren des Vorkörpers zu einem porösen Vorkörper, und (iv) Infiltrieren des porösen Vorkörpers mit einem Matrix- oder Matrix-bildenden Material. Ein Faserverbundwerkstoff, umfassend eine Metall- oder Keramik-Matrix, mit von der Matrix eingebetteten Fasern, wobei die Fasern isotrop im Werkstoff verteilt sind. Ein Verfahren zum Herstellen eines Faserverbundwerkstoffs, umfassend: (i) Bereitstellen eines Granulats, das Polymer und Fasern umfasst, (ii) Herstellen eines Vorkörpers aus dem Granulat, (iii) Pyrolysieren des Vorkörpers zu einem porösen Vorkörper, und (iv) Infiltrieren des por ...more ...less
13
EP3428137A1
Publication/Patent Number: EP3428137A1
Publication date: 2019-01-16
Application number: 18192289.9
Filing date: 2015-04-02
Abstract: A method for forming in situ a boron nitride reaction product locally on a reinforcement phase of a ceramic matrix composite material includes the steps of providing a ceramic matrix composite material having a fiber reinforcement material; and forming in situ a layer of boron nitride on the fiber reinforcement material. A method for forming in situ a boron nitride reaction product locally on a reinforcement phase of a ceramic matrix composite material includes the steps of providing a ceramic matrix composite material having a fiber reinforcement material; and forming in situ a layer of boron ...more ...less
14
EP3473607A1
Publication/Patent Number: EP3473607A1
Publication date: 2019-04-24
Application number: 18198904.7
Filing date: 2018-10-05
Abstract: L'invention concerne un procédé de fabrication d'une pièce de friction en matériau composite, comprenant au moins l'étape suivante : - densification d'une préforme fibreuse en fils de carbone par une matrice comprenant au moins du pyrocarbone et une phase ZrOxCy, où 1 ≤ x ≤ 2 et 0 ≤ y ≤ 1, la matrice étant formée par caléfaction ou par infiltration chimique en phase vapeur à partir d'un premier précurseur du pyrocarbone et d'un deuxième précurseur comprenant du zirconium, le deuxième précurseur étant un complexe du zirconium comprenant un ligand alcoxy ou carboxylate lié au zirconium. L'invention concerne un procédé de fabrication d'une pièce de friction en matériau composite, comprenant au moins l'étape suivante : - densification d'une préforme fibreuse en fils de carbone par une matrice comprenant au moins du pyrocarbone et une phase ZrOxCy, où 1 ≤ x ≤ 2 et ...more ...less
15
US10227704B2
Publication/Patent Number: US10227704B2
Publication date: 2019-03-12
Application number: 14/903,856
Filing date: 2014-07-09
Abstract: An airfoil is disclosed. The airfoil may comprise a leading edge, a body portion and a trailing edge formed from a high-modulus plating. The body portion of the airfoil may be formed from a material having a lower elastic modulus than the high-modulus plating. The high-modulus plating may improve the stiffness of the trailing edge, allowing for thinner trailing edges with improved fatigue life to be formed. An airfoil is disclosed. The airfoil may comprise a leading edge, a body portion and a trailing edge formed from a high-modulus plating. The body portion of the airfoil may be formed from a material having a lower elastic modulus than the high-modulus plating. The high-modulus ...more ...less
16
US20190084892A1
Publication/Patent Number: US20190084892A1
Publication date: 2019-03-21
Application number: 15/710,954
Filing date: 2017-09-21
Abstract: A ceramic matrix composite article includes a chemical vapor infiltration ceramic matrix composite base portion including ceramic fiber reinforcement material in a ceramic matrix material having between 0% and 5% free silicon. The ceramic matrix composite article further includes a melt infiltration ceramic matrix composite covering portion including a ceramic fiber reinforcement material in a ceramic matrix material having a greater percentage of free silicon than the chemical vapor infiltration ceramic matrix composite base portion. A ceramic matrix composite article includes a chemical vapor infiltration ceramic matrix composite base portion including ceramic fiber reinforcement material in a ceramic matrix material having between 0% and 5% free silicon. The ceramic matrix composite article further ...more ...less
17
EP2964888B1
Publication/Patent Number: EP2964888B1
Publication date: 2019-04-03
Application number: 13870404.4
Filing date: 2013-12-26
18
US20190091783A1
Publication/Patent Number: US20190091783A1
Publication date: 2019-03-28
Application number: 16/200,875
Filing date: 2018-11-27
Abstract: Electrodes for and methods of electrical discharge machining are provided. For example, a method for forming a feature in a ceramic matrix composite (CMC) component comprises repeatedly advancing an electrode into and retracting the electrode from the CMC component until a desired depth is reached, where the electrode has a head end, a tip end, and a shaft extending from the head end to the tip end. The shaft has a first side and a second side each recessed inward such that the head end and the tip end are wider than the shaft. A method for forming a feature in a CMC component also may include feeding a dielectric fluid into the feature utilizing the recessed sides. In some embodiments, electrodes may include a shaft extending from a head end to a tip end and a central plane, where the shaft is recessed widthwise toward the central plane. Electrodes for and methods of electrical discharge machining are provided. For example, a method for forming a feature in a ceramic matrix composite (CMC) component comprises repeatedly advancing an electrode into and retracting the electrode from the CMC component until a ...more ...less
19
US10221104B2
Publication/Patent Number: US10221104B2
Publication date: 2019-03-05
Application number: 15/165,676
Filing date: 2016-05-26
Abstract: A mixed gas containing a precursor gas, an additive gas and a carrier gas is supplied to a preform stored in an electric furnace, and silicon carbide is deposited by chemical vapor deposition or chemical vapor phase impregnation to form a film. The preform includes multiple fiber bundles, and the fiber bundles include multiple fibers. This heat-resistant composite material includes a ceramic fiber preform impregnated with silicon carbide, and producing the composite material involves a step in which silicon carbide is deposited between the fibers to integrate the fibers which configure the fiber bundles, and a step in which silicon carbide is deposited between the fiber bundles to integrate the fiber bundles. Hereby, uniformity of embedding and growth rate of the silicon carbide film are both attained. A mixed gas containing a precursor gas, an additive gas and a carrier gas is supplied to a preform stored in an electric furnace, and silicon carbide is deposited by chemical vapor deposition or chemical vapor phase impregnation to form a film. The preform includes multiple ...more ...less