759results about "Ceramic layered products" patented technology

The present invention relates to a method for controlling physical properties of a silicon nitride substrate, and more specifically, the method comprises the steps of: producing a silicon nitride substrate; and adjusting a residual magnesium content in the silicon nitride substrate. The thermal conductivity of the silicon nitride substrate is inversely proportional to the residual magnesium content in the silicon nitride substrate, and the flexural strength of the silicon nitride substrate is proportional to the residual magnesium content in the silicon nitride substrate.

The invention relates to the technical field of layered products, and particularly discloses a skin material for wave-absorbing hiding and a preparation method. The skin material is of a layered structure and comprises a bionic micro-forest wave-transparent layer, a gradient transition layer, a wave-absorbing layer with a'skeleton-matrix 'dual-network structure, a reflecting layer and a heat-insulating layer which are sequentially arranged from top to bottom. A micro-cone array is arranged on the surface of the bionic micro-forest wave-transparent layer, so that broadband impedance matching is realized; the wave-absorbing layer comprises a three-dimensional ceramic skeleton and a magnetic-dielectric composite matrix filled in pores of the skeleton, and magnetic absorbents in the wave-absorbing layer are directionally arranged in the layer plane direction through a magnetic field auxiliary technology. The skin material prepared by the invention has excellent comprehensive performance of ultra-wideband wave absorption, high mechanical strength, light weight and high temperature resistance, and is particularly suitable for stealth requirements in the field of aerospace.

It is described a process for producing transparent ceramic bodies with at least two zones having different garnet composition, in particular in which one of said zones has composition Y3AI5O12. The invention is especially useful for the production of transparent ceramic bodies having preset complex shapes and / or a controlled complex distribution of doping ions.

To highly accurately calculate a lamination deviation amount between two layers of a laminated sheet body.SOLUTION: The sheet body 2 has a first sheet body 3 and a second sheet body 4 which are alternately laminated. The first sheet body includes a first mark 3334 and first through-holes 30c, 30d. The second sheet body includes a second mark 4344 and second through-holes 440c, 40d. The first marker is formed such that the first direction D1 can be specified. The second mark is formed so that the second direction D2 can be specified. When the first sheet element is accurately stacked on the second sheet element, the second mark is located at a predetermined second ideal position with respect to the first mark. When the second sheet element is accurately stacked on the first sheet element, the first mark is located at a predetermined first ideal position with respect to the second mark. In the upward view, the positional relationship between the position of the first marker and the second ideal position with respect to the first direction coincides with the positional relationship between the position of the second marker and the first ideal position with respect to the second direction.SELECTED DRAWING: Figure 6

The invention relates to the technical field of flame-retardant materials, in particular to a ceramic fiber composite resin fireproof flame-retardant material and a preparation method and application thereof. The ceramic fiber composite resin fireproof flame-retardant material comprises a ceramic fiber fireproof layer and a continuous glass fiber RTM (Resin Transfer Molding) layer, the ceramic fiber fireproof layer comprises fireproof ceramic fibers and nano oxide / modified nano oxide, and the surface of the ceramic fiber fireproof layer is subjected to plasma activation operation and silane coupling agent treatment. The ceramic fiber composite resin fireproof flame-retardant material has an excellent thermal runaway protection effect, and the bonding effect between the ceramic fiber fireproof layer and the continuous glass fiber RTM layer is excellent.

The invention discloses a floor heating structure with a phase change material layer and a preparation method of the floor heating structure, and belongs to a floor heating structure, the floor heating structure comprises a base material layer, the phase change material layer, an auxiliary heat conduction layer and a floor surface layer from bottom to top in sequence; a metal heat-conducting net is embedded into the lower part of the base material layer; the phase change material layer comprises the following components in percentage by weight: 53%-58% of methyl laurate, 30%-35% of n-decanol, 5%-8% of nano aluminum oxide, 4%-6% of polyvinyl alcohol and 0.5%-1.5% of carboxymethyl cellulose. Solid-liquid phase change is carried out through the phase change material layer, redundant heat is absorbed, latent heat is released when a heat source is shut down, and therefore frequent starting and stopping of the heat source are reduced, and energy consumption is reduced. According to the multi-layer heat conduction design, through collaborative optimization of the metal heat conduction net and the auxiliary heat conduction layer, the heat efficiency of the floor heating structure is further improved, the heat response time is shortened, the latent heat characteristic of the phase change material is utilized, the heat buffering effect can be achieved in the floor, the heating temperature fluctuation range is reduced, and the heating comfort is improved.

The invention relates to the technical field of layered products, and particularly discloses a heat-insulating and wave-absorbing skin material as well as a preparation method and application thereof. The heat-insulating and wave-absorbing skin material is of an integrated layered structure based on an aluminum oxide-mullite system, comprising a functional gradient layer with double gradients of fiber density and aperture, an impedance matching layer with a gradient dielectric constant, a resonance wave absorbing layer with a periodic dot matrix formed by silicon carbide and aluminum oxide core-shell microspheres, and a heat insulation layer with a nano-micron double-scale pore structure. According to the preparation method, a green body is constructed mainly through tape casting and silk-screen printing, and then co-sintering integrated forming is carried out. The material has the excellent characteristics of high temperature resistance, toughness, efficient heat insulation, broadband wave absorption and the like, and is suitable for extreme environments such as hypersonic aircraft skin and the like.

The invention provides an oxygen-free copper sheet for a ceramic copper-clad plate, a preparation method of the oxygen-free copper sheet and the ceramic copper-clad plate, and the preparation method comprises the following steps: (1) melting and casting a copper plate raw material to obtain a cast ingot; (2) sequentially preheating and hot-rolling the cast ingot obtained in the step (1) to obtain a hot-rolled material; (3) the hot-rolled base material in the step (2) is roughly rolled, the deformation rate of each pass of rough rolling is controlled to be smaller than or equal to 30%, and a roughly-rolled material is obtained; (4) annealing the material subjected to rough rolling in the step (3) to obtain an annealed material; and (5) the annealed material in the step (4) is subjected to finish rolling, the deformation rate of each pass of finish rolling is controlled to be smaller than or equal to 35%, and the oxygen-free copper sheet for the ceramic copper-clad plate is obtained. The oxygen-free copper sheet for the ceramic copper-clad plate has excellent mechanical property and wide application prospect.

A method for producing a sodium solid electrolyte according to an embodiment of the present invention comprises the steps of: (a) preparing sintered bodies for beta-alumina production and powder pellets comprising a sodium source (or powder packs); (b) laminating the sintered bodies and the powder pellets comprising a sodium source (or powder packs) in alternation to prepare a stack; and (c) heat-treating the stack to subject the sintered bodies to vapor-phase conversion, wherein the powder pellets (or powder packs) may be molded bodies of powder containing a sodium source.

The present disclosure provides a polymer-derived ceramic thin film thermocouple and a preparation method thereof. The polymer-derived ceramic thin film thermocouple comprises an A electrode and a B electrode, wherein one end of the A electrode and one end of the B electrode intersect and overlap to form hot junctions, an end of the A electrode away from the hot junction and the end of the B electrode away from the hot junction are provided with solder joints. Each solder joint may be connected to a lead wire, the lead wire is configured for output a signal; the A electrode is prepared by mixing a polysilazane solution, nanocomposite powder and a xylene solution, and the nanocomposite is prepared by mixing indium oxide nanopowder, zinc oxide powder and anhydrous ethanol; the B electrode is prepared by mixing a polysilazane solution, indium oxide nanopowder, and a xylene solution.

This application relates to a method for manufacturing a printed circuit board. According to the present application, it is possible to manufacture a printed circuit board having excellent bonding strength between a ceramic substrate and a metal sheet, and the manufacturing cost thereof can be reduced.

The invention relates to a sintered ceramic body having a large size and a method for manufacturing the same. The method comprises the following process steps: providing a ceramic powder (5) within an internal volume of a spark plasma sintering tool (1), wherein the tool comprises: a mold (2); upper and lower punches (4, 4 ') creating a gap (3) between the punches and the inner wall when at least one of the punches moves within the internal volume; creating a vacuum condition within the interior volume; moving at least one of the punches to apply pressure to the ceramic powder while heating, and sintering; and reducing the temperature of the sintered ceramic body.

The present invention relates to a pre-sintered multi-layered dental mill blank comprising a top layer, a bottom layer, and at least one intermediate layer. The pre-sintered multi-layered dental mill blank or a part prepared thereof has one or more desirable properties when being fully sintered by a speed sintering process. The present invention also relates to a process for preparing a dental restoration using the pre-sintered multi-layered dental mill blank as well as to a dental restoration as such. The present invention further relates to a process for sintering a dental restoration precursor.

A layered assembly for use in a controlled atmosphere chamber includes a plurality of substrates and an electrically functioning layer embedded between two adjacent substrates of the plurality of substrates, the electrically functioning layer being a material configured to secure the two adjacent substrates together using a solid- state bonding process. An electrical termination area is integral with the electrically functioning layer, and a peripheral sealing band is embedded between and extends around a periphery of internal faces of the two adjacent substrates, the peripheral sealing band being a material configured to secure and seal the two adjacent substrates together using the solid-state bonding process. Dielectric regions are present between the two adjacent substrates and between edge boundaries of the electrically functioning layer, the dielectric regions being sealed between the two adjacent substrates by the peripheral sealing band.

The invention relates to the technical field of textile materials, in particular to a thermal imaging and far infrared prevention fabric and a preparation method thereof.The fabric comprises a three-layer structure, the first layer is a base material bottom layer, the second layer is a reinforcing framework layer, and the third layer is a low-emissivity surface layer; the base material bottom layer comprises modified aramid fiber, the two sides of the modified aramid fiber are coated with low-emissivity slurry, and the low-emissivity slurry comprises nickel micro powder modified resin; the reinforced skeleton layer comprises a carbon fiber yarn and pre-oxidized fiber blend, and a conductive layer is attached to the surface of the carbon fiber yarn; the low-emissivity surface layer comprises nickel micro powder modified resin and ceramic micro powder. The preparation method of the fabric comprises the following steps: modifying the aramid fibers, pretreating the carbon fibers and the pre-oxidized fibers, coating by using low-emissivity slurry, bonding, and then carrying out hot press molding. The fabric can reflect 90% of radiant heat, and the emissivity lt of the spectrum at the wave band of 8-14 microns is achieved; the cable has excellent thermal imaging and far infrared prevention functions, has a flame retardant grade V0, and is suitable for various civil scenes.

To provide a multilayer ceramic electronic component capable of improving bias characteristics while maintaining ferroelectricity.SOLUTION: A multilayer ceramic electronic component includes: a dielectric layer that has barium titanate as a main component, and has a core portion and a shell portion covering the core portion, in which calcium is solid dissolved in the shell portion, and includes a plurality of crystal grains in which a calcium concentration in the shell portion is 10 times or more a calcium concentration in the core portion; an internal electrode that is provided with the dielectric layer interposed therebetween, and has nickel or copper as a main component; and an external electrode that is electrically connected to the internal electrode.SELECTED DRAWING: Figure 1

The invention discloses a flexible copper-clad plate with high thermal conductivity and low dielectric property and a preparation method of the flexible copper-clad plate. The flexible copper-clad plate comprises an insulating substrate, the composite film is a thermoplastic polyimide / heat-conducting low-dielectric ePTFE / thermoplastic polyimide insulating composite film which is composed of a middle layer ceramic / boron nitride-expanded polytetrafluoroethylene functional hybrid membrane and thermoplastic polyimide layers on the two sides of the middle layer ceramic / boron nitride-expanded polytetrafluoroethylene functional hybrid membrane. And the flexible conductive metal foil is compounded with the single surface, double surfaces or multiple layers of the insulating substrate through a thermal forming compounding process. Through the mode, the flexible copper-clad plate can have excellent peel strength under the adhesive-free condition through structure optimization and process innovation, low dielectric constant and low dielectric loss tangent value can be realized under the high-frequency condition, and meanwhile, the heat conductivity coefficient is remarkably improved. And through continuous production, the efficiency is greatly improved, and a high-reliability base material is provided for the high-end electronic fields such as new energy vehicles, 5G / 6G communication and wearable equipment.

Provided is a ceramic plate in which the adhesion strength between a ceramic substrate and an internal electrode is improved. This ceramic plate is provided with: a ceramic substrate containing aluminum oxide and / or aluminum nitride; and an internal electrode that contains an electrode base material, a coefficient of thermal expansion adjusting material, and Ti and is implanted in the ceramic substrate, the ceramic substrate having a Ti diffusion region in which Ti diffuses around the internal electrode.

A transpirational cooling panel comprises a porous ceramic matrix composite layer and a porous high-temperature fabric layer. A machined ceramic fiber batting is located between the porous ceramic matrix composite layer and the porous high-temperature fabric layer. A ceramic stitching joins the porous ceramic matrix composite layer and the porous high-temperature fabric layer through the machined ceramic fiber batting.

The invention discloses an aerogel heat insulation pad with a heat conduction layer and a preparation method of the aerogel heat insulation pad. The heat insulation pad is formed by clamping a heat conduction layer between two aerogel layers, and the heat conduction layer can disperse heat to the whole plane from a local concentration point and dissipate the heat to the air through the aerogel layers. By optimizing the material and structural design of the heat conduction layer, the heat dissipation and soaking capacity of the aerogel layer in the cross section direction is remarkably improved, and meanwhile the heat insulation performance of aerogel is reserved. The heat insulation pad has excellent heat management performance and is suitable for the fields of electronic equipment heat dissipation, aerospace heat management, building heat preservation and the like.

The utility model relates to energy storage equipment, in particular to a fireproof composite board and an energy storage cabinet, the fireproof composite board comprises a board body and a fireproof composite structure, the fireproof composite structure is arranged in an interlayer cavity of the board body, and the fireproof composite structure comprises a flame impact resistant layer and at least two heat insulation layers. The thermal insulation layers are stacked on the flame impact resistant layer layer by layer, gaps are pressed between the adjacent thermal insulation layers, each thermal insulation layer comprises a plurality of aerogel thermal insulation sheets which are arranged in a spliced mode, the flame impact resistant layer and the thermal insulation layers made of the aerogel materials are combined with the board body for use, and the fireproof performance and the thermal insulation performance of the board are effectively improved. And the device is suitable for equipment with high fire endurance requirements such as energy storage cabinets.

The invention relates to the technical field of chute lining plates, and discloses a high-wear-resistance chute lining plate and a preparation method thereof.The high-wear-resistance chute lining plate comprises a chute lining plate body, and the chute lining plate body comprises a ceramic layer and a buffer layer; in the ceramic layer, a matrix is prepared from 35wt% of alpha-Al2O3, and a toughening phase is prepared from 7wt% of zirconium oxide whiskers and 4wt% of TiCN nanoparticles; the buffer layer is hydrogenated butadiene-acrylonitrile rubber, and the acrylonitrile content is 34%. According to the preparation method disclosed by the invention, through a three-stage technical route of component gradient design, gel precision forming and interface reaction regulation and control, strengthening and toughening, high-temperature performance optimization and multi-scale enhancement of the alumina-based ceramic are realized: macro-scale (zirconia whisker) + mesoscale (TiCN nanoparticles) + micro-scale (NiCr metal phase) cross-scale synergy is realized; and in-situ reaction: vacuum sintering at 1850 DEG C is utilized to trigger TiCN / NiCr interface reaction, a TiC-NiCr metal ceramic transition layer is generated, and the mechanism compressive strength is improved through a metal ceramic composite material, so that the chute lining plate has better impact resistance and wear resistance effects.

A dielectric ceramic composition includes a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient, the accessory ingredient including dysprosium (Dy) and praseodymium (Pr) as first accessory ingredients. A content of the Pr satisfies 0.233 mol≤Pr≤0.699 mol, based on 100 mol of the barium titanate base material main ingredient.

An article for a high temperature environment includes a first ceramic composite substrate, a second ceramic composite substrate, and a high temperature interface between a first surface of the first ceramic composite substrate and a second surface of the second ceramic composite substrate. The high temperature interface includes at least one high temperature interface layer that includes a ceramic matrix and a plurality of fibers distributed through the ceramic matrix.

The reusable high-temperature-resistant thermal protection structure comprises a flexible buffer layer, a high-temperature-resistant thermal insulation layer and a rigid thermal protection layer, the high-temperature-resistant thermal insulation layer is located on the upper surface of the flexible buffer layer, and the flexible buffer layer and the rigid thermal protection layer are bonded and combined through a high-temperature-resistant adhesive; the rigid heat-proof layer is positioned on the upper surface of the high-temperature-resistant heat-insulating layer and is screwed and combined in a mechanical manner; and the reusable high-temperature-resistant thermal protection structure is adhered to the surface of the base material through a high-temperature-resistant adhesive. By adopting the design thought that the flexible buffer layer and the high-temperature-resistant heat-insulating layer as well as the high-temperature-resistant heat-insulating layer and the rigid heat-proof layer are respectively screwed and combined in an adhesive and mechanical manner, the heat-proof composite material has the capability of resisting a high-temperature environment of more than 1400 DEG C and repeatedly preventing heat for multiple times, the engineering workload is reduced, and the working efficiency is improved. The problems that an existing carrier rocket surface thermal protection coating is low in heat-resistant temperature and cannot be repeatedly used are solved. Meanwhile, the adopted high-temperature-resistant heat insulation layer is made of aerogel materials, the efficient heat insulation capacity is achieved, and it is ensured that heat is lost in the transfer process.

A method of manufacturing a CMC structure (F) includes infiltrating a porous substrate (A) with a composite material and performing a first densification on the infiltrated porous substrate, forming a first densified porous substrate (C), wherein the first densification includes techniques selected from the group of techniques comprising photonic curing, photonic sintering, pulsed thermal heating, or combinations thereof.

The invention discloses a novel method for preparing a metal bonding substrate. A method may include providing a ceramic substrate including a ceramic body. The method may include bonding a thick metal plate to the ceramic substrate, where the bonding includes forming a metal oxide layer by powder deposition on a metal surface and bonding the ceramic substrate and the thick metal plate together, where after the bonding, the ceramic substrate and the thick metal plate are bonded together. The metal oxide layer and the thick metal plate interact to form an interfacial layer between the thick metal plate and the ceramic substrate.