1556results 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 present disclosure provides energy absorbing materials and methods of fabricating the same. The energy absorbing materials of the present disclosure comprise a plurality of repeating cells, wherein each of the plurality of cells comprises a three-dimensional plate lattice, wherein a least a portion of plate lattice is prebuckled.

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 preparing a ceramic fabric and ceramic matrix composite components constructed from the ceramic fabric include transforming ceramic tows, or ceramic fabrics, to varying degrees from a first tow geometry to a second tow geometry, thereby reducing a first dimension of the ceramic tows and increasing a second dimension of the ceramic tows orthogonal to the first dimension. Plies constructed with flattened tows, or as-received tows, have various inter-tow pore sizes that are arranged with increasing inter-tow pore size towards exterior surfaces of the preform structure.

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.

Provided is a laminate structure for manufacturing a silicon nitride substrate, comprising: an upper plate; a lower plate; and at least one silicon nitride laminate sheet interposed between the upper plate and the lower plate, wherein the silicon nitride laminate sheet comprises one or a plurality of laminated silicon nitride sheets, and spherical boron nitride is coated on at least one surface of the silicon nitride laminate sheet.

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.

Components for a gas turbine engine and method for producing the components are provided. The components may include a substrate and a thermal barrier coating (TBC) having at least a first layer secured to a surface of the substrate. The first layer is formed of a ceramic material with a first microstructure that includes a plurality of interconnected unit cells having struts that have a relative density of greater than 98 percent and a closed cell porosity of 10 percent or greater. The TBC is secured to the substrate subsequent to formation of the TBC.

The invention discloses a lead-free energy storage ceramic laminated material, and belongs to the technical field of dielectric energy storage. The lead-free energy storage ceramic laminated material is formed by sequentially laminating lead-free energy storage ceramic with a texture structure and lead-free energy storage ceramic with a non-texture structure, and preferably, the material comprises at least three layers; when the lead-free energy storage ceramic with the texture structure is positioned on the middle layer, the lead-free energy storage ceramic with the non-texture structure is positioned on the two sides of the middle layer; when the lead-free energy storage ceramic with the non-texture structure is located on the middle layer, the lead-free energy storage ceramic with the texture structure is located on the two sides of the middle layer. Based on the structural design of at least three layers, the non-textured ceramic is selected as the high-voltage-resistant layer, the textured ceramic is selected as the high-polarization layer, the lead-free ceramic laminated material with excellent energy storage performance is obtained, and the lead-free ceramic laminated material has wide application prospects in the fields of power electronics and pulse power.

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 disclosed technology generally relates dielectric materials and methods of forming the same, and more particularly to a combination of co-fireable dielectric materials that can be attached to each other without the use of adhesives. In an aspect, a composite article comprises a magnetic portion comprising a nickel zinc ferrite. The composite article additionally comprises a non-magnetic portion contacting the magnetic portion, the non-magnetic portion comprising a spinel-structured oxide comprising Mg2-xAl2xTi1-xO4 and having a dielectric constant between about 7 and 14, wherein 0<x≤1.

The invention discloses a resin composition, a bonding sheet containing the resin composition, a copper-clad plate containing the resin composition and a preparation method of the resin composition. The resin composition comprises the following raw materials in parts by weight: 65-75 parts of ceramic powder, 25-35 parts of a modified polytetrafluoroethylene emulsion, 0.3-5 parts of a nonionic water-based anti-settling agent, 15-55 parts of an organic solvent and 10-25 parts of solvent oil. The preparation method specifically comprises the following steps: (1) vacuum mixing: adding a modified polytetrafluoroethylene emulsion into a non-ionic water-based anti-settling agent, uniformly mixing, then adding ceramic powder, and performing vacuum mixing to achieve a uniform suspension state; and (2) demulsification resinification: adding the solvent oil, uniformly mixing, then adding the organic solvent while stirring, and stirring, mixing and demulsifying to obtain the product. According to the preparation method disclosed by the invention, a preparation process is deeply studied, the ceramic is used for filling the modified polytetrafluoroethylene emulsion and the non-ionic anti-settling agent to uniformly suspend in a distribution state, and resin fibration is formed through demulsification of the organic solvent within a short time to retain the flexibility, so that the aim of preparing a base material and an FCCL with the ultrathin thickness of less than 0.050 mm is fulfilled.

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 discloses a preparation method of electrostatic chuck ceramic with low temperature dependence, the electrostatic chuck ceramic and an electrostatic chuck. The method comprises the following steps: weighing CaO powder, SiO2 powder and MgO powder according to a weight ratio, and mixing to obtain mixed powder; the mixed powder is sequentially subjected to ball milling, drying, melting, quenching and smashing, and non-crystallized mixed powder is obtained; weighing aluminum oxide powder, non-crystallized mixed powder, MgO powder and Y2O3 powder according to the weight ratio; mixing the weighed powder, adding a solvent, a dispersing agent, a binder and a plasticizer, and carrying out ball milling and vacuum defoaming to obtain tape casting slurry; preparing the tape casting slurry into a ceramic raw ceramic chip through a tape casting process; and performing lamination and isostatic pressing on the ceramic green ceramic chips to obtain the ceramic forming body. The electrostatic chuck ceramic prepared by the invention has relatively low temperature dependence, and when the electrostatic chuck ceramic is suitable for an electrostatic chuck, the electrostatic chuck ceramic can be stably adsorbed and desorbed in a relatively large temperature range.

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

The invention relates to a method for producing a part made of ceramic matrix composite material, the method comprising at least: - a step of forming (10) a fibrous preform; - a step of consolidating (20) the fibrous preform; - an injection step (30), during which a slurry comprising a powder of silicon carbide particles is injected into the fibrous preform, so as to obtain a raw part (100); and - an infiltration step (60), during which a molten silicon-based composition is infiltrated, so as to form a part made of ceramic matrix composite material. The method further comprises: - a step of depositing (40) at least one finishing layer (200) over all or part of the raw part (100); and - a thermocompression step (50), during which the finishing layer (200) is thermocompressed according to a final geometry of the part made of ceramic matrix composite material.

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