1259results about "Ceramic layered products" patented technology

The invention relates to the technical field of ceramic substrates, and provides an aluminum oxide multilayer ceramic substrate and a preparation method thereof. The aluminum oxide multilayer ceramic substrate comprises the following raw materials in parts by weight: 80-90 parts of pretreated aluminum oxide, 1-4 parts of a sintering aid, 1-2 parts of a dispersing agent, 6-12 parts of a binder and 85-95 parts of a solvent, the preparation method of the pretreated aluminum oxide comprises the following steps: performing wet ball milling, drying, sintering and crushing on aluminum oxide, manganese sesquioxide, magnesium oxide and zirconium oxide to obtain the pretreated aluminum oxide. According to the technical scheme, the problem that the bending strength of the aluminum oxide multilayer ceramic substrate prepared from the aluminum oxide raw material with the purity of 95% in the related technology is low is solved.

The invention discloses a sweating and cooling composite thermal protection structure based on a porous metamaterial, which belongs to the technical field of active thermal protection of aircrafts and comprises a layered metamaterial composite structure body. The layered metamaterial composite structure body sequentially comprises a spectrum stealth porous superstructure layer, an infrared thermal stealth porous superstructure layer and a hydrogel filling layer from top to bottom. The infrared thermal stealth superstructure porous material is used as a core, the anisotropic thermal conductivity characteristic of the infrared thermal stealth porous superstructure layer is achieved through the micro-nano structure design and different porosity distribution, transfer of surface heat flow in the horizontal direction and transfer of heat to the coolant phase change layer in the vertical direction can be accelerated, a sweating cooling mechanism is triggered, and the heat transfer efficiency is improved. Local high temperature of the surface is effectively eliminated, the average temperature of the surface is rapidly reduced, and the heat radiation amount is reduced, so that efficient thermal protection is achieved, the infrared thermal stealth function is achieved, and the spectrum stealth requirement is also met by combining the surface spectrum stealth porous superstructure layer.

A method of forming a ceramic matrix composite component includes forming a fiber preform, the fiber preform including a plurality of ceramic fiber plies, a non-reduced fiber region having an areal weight, and a reduced fiber region characterized by a reduced areal weight less than the areal weight of the non-reduced fiber region by at least 5 percent. The method further includes selectively applying ceramic particles to the reduced fiber region in such manner as to avoid applying the ceramic particles to the non-reduced fiber region, and subsequently densifying the preform.

The invention relates to the technical field of ceramic substrates, and provides an aluminum oxide high-temperature co-fired multilayer ceramic substrate and a preparation method thereof. The aluminum oxide high-temperature co-fired multilayer ceramic substrate comprises the following raw materials in parts by weight: 80-90 parts of aluminum oxide, 3-6 parts of a reinforcing agent, 2-5 parts of a sintering aid, 85-95 parts of a solvent, 6-12 parts of a binder and 0.5-1.5 parts of a dispersing agent, the reinforcing agent comprises yttrium oxide coated silicon carbide and copper oxide. According to the technical scheme, the problem that the strength of the aluminum oxide high-temperature co-fired multilayer ceramic substrate is insufficient due to long-time high-temperature sintering of a low-viscosity liquid phase in related technologies is solved.

Embodiments relate to a flame barrier that may be adhered or mechanically fastened to a substrate to provide fire resistance and / or an outer protective surface. The flame barrier may alternatively be adhered or mechanically fastened to an existing flame barrier to provide increased fire resistance and / or increased protective ability. The flame barrier is configured to protect against high temperature flames, prevent flame penetration, and contain aggressive flames to reduce the severity of the flame's impact, heat, and velocity.

The present application discloses a head-up display glass and a head-up display system. The head-up display glass includes laminated glass and a reflective film layer; the laminated glass includes an outer glass plate, a polymer interlayer, and an inner glass plate; the reflective film layer includes an inner barrier layer, an improvement layer, and at least one laminated structure arranged in a stacked manner. The inner barrier layer can block the damage of alkali metal ions on the glass surface to the improvement layer during the heat treatment process and block the oxidation of the improvement layer caused by the diffusion of oxygen. The improvement layer can further improve the reflectivity of the reflective film layer to P-polarized light while maintaining a low reflectivity of the reflective film layer to visible light, so that when the driver inside the vehicle visually observes the reflective image of the head-up display glass, only the reflective image of the reflective film layer can be observed, thus eliminating the visual ghosting phenomenon; moreover, the reflectivity of the head-up display glass in the present application to visible light is less than or equal to 15%, and no obvious reflection phenomenon can be observed inside the vehicle.

A method of manufacturing a composite panel is provided. The method includes applying a composite face sheet to a first side of a core structure, the core structure comprising a plurality of first ceramic particles each having a first particle size that is within a first particle size range and the composite face sheet comprising a plurality of second ceramic particles each having a second particle size that is within a second particle size range, wherein the second particle size range is smaller than the first particle size range and densifying the composite panel through infiltration, wherein the infiltration comprises transport of an infiltrant through the core structure and into the composite face sheet.

Composite multilayered material compositions are provided which contain one or more hexagonal boron nitride (hBN)-containing layers, together with layers comprising optional polymeric binders, glass fibers, magneto-ceramic materials, and a super-hydrophobic outer coating. Methods are provided for making the composite materials and products containing them. The composite materials are useful for making radomes and other coverings for electronic components and equipment.

The invention discloses an energy-saving driving device based on automatic control, which comprises a support frame, a conveying mechanism is mounted at the upper end of the support frame, a transmission belt is mounted on the conveying mechanism, a plurality of photonic crystal pressure sensors are arranged on the transmission belt at equal intervals, and a driving motor body is mounted at one end of the conveying mechanism. A protective shell is installed on the outer side of the driving motor body, a stator shell is installed in the protective shell, a plurality of stator grooves are formed in the circumferential side wall in the stator shell at equal intervals, and heat storage layers are installed in the stator grooves. The static heat insulation limitation of a traditional vacuum heat insulation plate is broken through, the shell of the driving device has the efficient heat insulation and active heat dissipation capacity, in addition, the maintainability is greatly reduced through the self-repairing design, the use convenience is improved, light intensity change is used for detecting goods distribution, linkage adjustment of the rotating speed of the transmission roller is achieved, and idling energy consumption is reduced; the paraffin and graphene composite phase change material can fully meet the low-temperature conveying requirement, and the service life is prolonged.

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 is applicable to the technical field of ceramic high-temperature sensors, and provides a high-temperature co-sintered multilayer special-shaped ceramic high-temperature sensor and a preparation method thereof.The ceramic high-temperature sensor sequentially comprises a protective layer, a functional layer, an insulating layer and a supporting layer, and metal electrode networks are printed on the functional layer and the supporting layer; according to the high-temperature co-sintered multilayer special-shaped ceramic high-temperature sensor, zirconium oxide and aluminum oxide are used as matrixes, lanthanum oxide and yttrium oxide are added, the microstructure and performance of ceramic are optimized, the ceramic has higher high-temperature resistance, mechanical strength and stability, the nano Al2O3 is doped with platinum-iridium alloy ink, and the high-temperature co-sintered multilayer special-shaped ceramic high-temperature sensor has the advantages that the high-temperature co-sintered multilayer special-shaped ceramic high-temperature sensor is more stable in performance. The problem of interface failure of metal and ceramic at high temperature is solved, the electrode made of high-temperature-resistant metal ink is printed on the ceramic layer through the 3D printing technology, good binding force and conductivity exist between the electrode and the ceramic layer, and the electrode can stably work in the high-temperature environment.

The present invention discloses a porous material transpiration cooling leading edge structure, which includes multiple layers of porous material layers and a cooling cavity provided on one side of the multiple layers of porous material layers. A coolant supply channel is provided in the cooling cavity, and the coolant supply channel is used to supply coolant to the cooling cavity. The multiple layers of porous material layers include an outer layer, an intermediate layer, and an inner layer, and the material of the inner layer is a shape memory alloy porous material. The present invention can adaptively adjust the porosity of the porous material, automatically adjust the usage amount of the coolant, effectively improve the usage efficiency of the coolant, and further enhance the thermal protection effect in the high-temperature tip region. Moreover, the shape memory alloy material can be reused. The porous material transpiration cooling leading edge structure can be used for structures such as the nose cone of an aircraft, the leading edge of a rudder, and the leading edge of a wing that are subjected to more high-temperature heat fluxes.

The invention provides a transparent bulletproof ceramic composite structure with an electric heating function and a preparation method of the transparent bulletproof ceramic composite structure. The composite structure comprises an anti-splashing layer (1), a first middle layer film (2), a multi-layer stacked structure (3) of glass sheets and films, a first transition layer (4), an electric heating film layer (5), a second transition layer (6), a ceramic layer (7), a first antireflection film layer (8), a second antireflection film layer (9), a third antireflection film layer (10), a second middle layer film (11), an inorganic glass layer (12), a third transition layer (13) and an anti-static layer (14) which are arranged in sequence. The composite structure provided by the invention has excellent impact resistance and bulletproof grade, can effectively resist the damage of high-speed elastic sheets or impact objects, and meets the requirements of high-safety application scenes such as weapon armors, armed airplanes and high-speed trains; and the anti-static film has clear optical observation capability, high transmissivity and anti-static property.

Systems, structures, devices, and fabrication processes for ceramic matrix composites suitable for use in a nuclear reactor environment and other applications requiring materials that can withstand high temperatures and / or highly corrosive environments are disclosed. In one aspect, a ceramic composite structure is provided. The structure comprises a chamber including an external shell and a hollow space inside the external shell. The external shell includes an inner composite layer including a first composite structure, a middle composite layer placed outside of the inner composite layer, the middle composite layer including a second composite structure that is different from the first composite structure, and an outer monolithic layer that has a spatially uniform material property and placed outside of the middle composite layer.

The invention relates to the technical field of protection equipment, and discloses a spliced bulletproof plugboard and a preparation method thereof.The spliced bulletproof plugboard comprises a first aramid sheet layer, a ceramic plate layer, a second aramid sheet layer and a polyethylene plate layer which are sequentially arranged in the direction from a bullet facing face to a bullet backing face; the ceramic plate layer comprises a ceramic plate and a long fiber layer circumferentially wrapping the side face of the ceramic plate, and the ceramic plate is formed by bonding and splicing a plurality of ceramic blocks. According to the invention, the plurality of ceramic blocks are bonded and spliced into the ceramic plate, and meanwhile, the circumferential side edge of the ceramic plate is wrapped by the long fiber layer to form circumferential constraint, so that the constraint rigidity between the spliced ceramic blocks can be effectively improved, and further, the ceramic close to a striking point is effectively prevented from shifting or being separated from the adjacent layer; the multiple resistance and the side edge protection performance of the bulletproof inserting plate are improved, and deformation and sinking at the moment of bouncing are reduced.

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.

A ceramic substrate including a porous internal structure including a sealant infiltrator. The sealant infiltrator includes sodium and silicate. The sealant infiltrator infiltrates at least some of the plurality of pores and closes the plurality of pores filled with the sealant infiltrator when exposed to a negative pressure. The sealant infiltrator is distributed across the exterior surface of the ceramic substrate.

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.

The invention provides a bulletproof structure and a preparation process thereof. The bulletproof structure comprises a ceramic layer plate, a titanium alloy layer plate, an aramid fiber layer plate, an ultra-high molecular weight polyethylene layer plate and a honeycomb heterogeneous anti-impact layer which are sequentially stacked, the ceramic layer plate and the titanium alloy layer plate, the titanium alloy layer plate and the aramid fiber layer plate, and the aramid fiber layer plate and the ultra-high molecular weight polyethylene layer plate are connected through a large-surface-density polyurethane resin adhesive film; wherein the ceramic laminate is made of nano modified B4C ceramic or nano modified TiB2 ceramic. The impact resistance of the base body can be improved, incoming projectiles are partially eroded and decomposed in the residence stage of the ceramic plate, then a large number of cracks are formed on the surfaces, conical fracture failure is achieved, bullet energy is decomposed greatly, the projectiles are eroded to deform and break, high temperature of combustion of the projectiles is blocked, and the impact resistance of the ceramic plate is improved especially for large-momentum and high-invasion-force projectiles. The invention particularly relates to a 12.7 mm armor-piercing combustion bomb and a kinetic energy warhead below.

To provide a manufacturing method for a multilayer electronic component in which reduction in quality caused by a mold release film is prevented and provide a mold release film used for the same.SOLUTION: A manufacturing method for a multilayer electronic component 1 includes a step for coating one surface of a mold release film 100 with a ceramic slurry and forming a ceramic green sheet 10, a step for printing an internal electrode pattern 12 on the ceramic green sheet 10, a step for laminating the ceramic green sheets 10 and obtaining a laminated body 2, a step for obtaining a ceramic sintered body 4, and a step for forming an external electrode 6. The mold release film 100 includes a substrate 102 and a mold release layer 110. A counter layer 2000 is provided on the surface of the substrate 102 on which the mold release layer 110 is not provided.SELECTED DRAWING: Figure 3

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

To provide a thickness measuring device capable of precisely measuring the thickness of a functional sheet of a coating film formed on a carrier sheet, and a manufacturing device and a manufacturing method of a ceramic green sheet utilizing the thickness measuring device.SOLUTION: A thickness measuring device 1 for measuring the thickness of a coating film 20 formed on a conveyed carrier sheet 10 includes: a first measurement section 1A for acquiring thickness information of the carrier sheet 10 before formation of the coating film 20 by applying light, and acquiring a first position; a second measurement section 1B for acquiring thickness information of the carrier sheet 10 and the coating film 20 after formation of the coating film 20 by applying radiations, and acquiring a second position; and an arithmetic processing section for calculating the thickness of the coating film on the basis of the thickness information of the carrier sheet of the first position and the thickness information in the second position.SELECTED DRAWING: Figure 1

A multilayer ceramic electronic component includes a component body, a first external electrode provided on a first end surface of the component body, and a second external electrode provided on a second end surface of the component body. An absolute value of a difference between a surface roughness of a first side surface and a surface roughness of a second side surface of the component body is smaller than an absolute value of a difference between a surface roughness of a first main surface and a surface roughness of a second main surface.

The invention relates to a focusing type voiceprint acquisition sensor, and discloses a sensor which realizes accurate focusing of equipment operation sound, reduction of environmental noise interference, improvement of sound signal quality, multi-dimensional voiceprint feature extraction and convenience for subsequent equipment operation state analysis through cooperation of an array type multi-direction sound acquisition module and a focusing concave mirror. The device is characterized in that the device is composed of a sound insulation cover, a sound collection hole, a voiceprint collection cylinder, a multi-angle voiceprint collection cylinder, a connecting rod, a sound collection module, a voice processing module and a focusing concave mirror, one end of the voiceprint collection cylinder is arranged on the multi-angle voiceprint collection cylinder and communicates with the multi-angle voiceprint collection cylinder, and the other end of the voiceprint collection cylinder is of an opening structure; the sound insulation cover is arranged at the other end of the voiceprint collection cylinder, sound collection holes which are densely arranged are formed in the sound insulation cover, the sound collection holes are tiny holes, the sound collection holes are close to the upper edge of the sound insulation cover, and the focusing concave mirror is arranged in the voiceprint collection cylinder and corresponds to the sound collection holes.

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 belongs to the technical field of intelligent moisture control of filter press filter plates and filter cakes, and relates to an intelligent moisture control method of a filter press filter plate and a filter cake integrated with a high-voltage-resistant electrode array. The method comprises the following steps: embedding a high-voltage-resistant electrode array into the surface of a filter plate, and detecting an electrical impedance parameter of each region in a filter cake forming process in real time; reconstructing water distribution in the filter cake in real time and generating a dynamic image by using the electrical impedance data of the plurality of groups of electrode pairs; meanwhile, establishing a mathematical model between the electrical impedance and the water content of the filter cake to obtain the real-time water content of the filter cake; and according to the moisture distribution image and the moisture content data, dynamically adjusting the parameters of the filter press through a closed-loop feedback system to realize accurate control of the moisture content of the filter cake.

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 relates to a composite flexible asphalt-based anti-corrosion paste and a preparation method thereof.The composite flexible asphalt-based anti-corrosion paste is divided into four layers including a hydrophobic blocking layer, high-temperature-resistant anti-corrosion cloth, a low-temperature flexible anti-corrosion bonding layer and an isolating membrane, and the hydrophobic blocking layer comprises a blocking layer A, a blocking layer B, a blocking layer C, a blocking layer D and a blocking layer E which are sequentially connected. The isolating membrane is a bonding layer protective membrane before construction and is torn off during construction, and the low-temperature flexible anti-corrosion bonding layer is bonded with the traffic isolating wall. The product provided by the invention has multiple properties of high binding power, low-temperature construction, high and low temperature resistance, freeze thawing resistance, aging resistance, salt resistance, ultraviolet resistance, acid and alkali corrosion resistance, water resistance and the like, effectively defends permeation of chloride ions and saline water, prevents corrosion of a snow-melting agent to the cement concrete anti-collision wall, and prolongs the anti-corrosion maintenance interval of the anti-collision wall to 3-5 years or more. The product can be well adhered to an anti-collision wall in a low-temperature state, and the apparent color of the material is not changed after the material is corroded by a snow melting agent.

A method for producing thermal insulation for a high-temperature tube furnace comprising at least the following steps: a) providing at least one heating conductor, wherein the at least one heating conductor is a wire-shaped heating conductor made of tungsten or molybdenum, b) fixing the at least one heating conductor with a slip containing aluminum oxide, c) drying the slip applied in b), d) applying a first layer of aluminum wool to the fixed at least one heating conductor, e) inserting the at least one heating conductor coated in this way into a sealable housing in such a way that a circumferential gap is formed between the sealable housing and the at least one coated heating conductor, f) introducing a second layer of a ceramic concrete mass containing at least 66% by mass of hollow spherical corundum, 2 to 12% by mass of hydraulically setting alumina cement and 1 to 2% by mass of at least one surfactant into the space formed to form a furnace body, g) Thermal treatment of the formed furnace body.