67results about "Ceramics" patented technology

A method and system for protecting electrode arrays while implanted on a brain including a flexible electrode array including non-penetrating cortical surface microelectrodes, a ceramic layer covering the electrode array and a polymer layer adjacent the ceramic layer, wherein the ceramic layer and the polymer layer hermetically seal the electrode array. The ceramic layer can be configured to exhibit sufficient flexibility to allow the electrode array to be implanted using minimally invasive surgical techniques, while still hermetically sealing the electrode array from a biological environment.

Proposed is a method for producing an insulating composite material for a silicone rubber socket, in which the method includes a step of producing a molded body of a mixture of liquid silicone and a heterogeneous composite powder composited from (i) metal powder and (ii) polymer or ceramic powder. An insulating composite material for a silicone rubber socket, produced by the method, is also proposed. Further proposed is a silicone rubber socket manufacturing method including the steps of producing a sheet-shaped molded body from a mixture including liquid silicone and a heterogeneous composite powder composited from (i) a metal powder and (ii) a polymer or ceramic powder and (b) forming a plurality of pores extending through the sheet-shaped molded body in a thickness direction and filling the pores with a conductive material. In addition, a silicone rubber socket manufactured by the method is also proposed.

The invention relates to the technical field of ceramic materials, in particular to temperature-stable low-loss low-dielectric tetragonal lithium-based microwave dielectric ceramic and a preparation method thereof, the chemical formula of the microwave dielectric ceramic is LiScO2, and the preparation raw materials are Li2CO3 and Sc2O3. The preparation method comprises the following steps: weighing Li2CO3 powder and Sc2O3 powder according to a certain proportion, mixing, sequentially carrying out wet grinding and drying, pre-sintering for 4-8 hours in an air atmosphere at the temperature of 700 DEG C to obtain pre-sintered powder, carrying out secondary ball milling and drying on the pre-sintered powder, adding a binder, granulating, carrying out compression molding, and finally sintering for 4-8 hours in an air atmosphere at the temperature of 875-925 DEG C, so as to obtain the Li2CO3 / Sc2O3 composite material. The tetragonal lithium-based microwave dielectric ceramic can be obtained. The LiScO2 microwave dielectric ceramic prepared at the sintering temperature of 900 DEG C has a near-zero temperature coefficient of resonance frequency (-3.4 ppm / DEG C), can ensure the thermal stability of devices, and is widely used for manufacturing various dielectric antenna substrates, resonators, filters and other microwave devices.

The invention relates to high-solid-content AlN ceramic slurry for tape casting, a substrate and a preparation method of the substrate, and belongs to the field of ceramic substrates. The ceramic slurry is prepared from the following components in percentage by mass: 60 to 68 weight percent of high-purity AlN powder, 3 to 6 weight percent of dispersing agent, 3 to 5 weight percent of binding agent, 4 to 6 weight percent of plasticizer, 3 to 6 weight percent of sintering aid and 32 to 45 weight percent of solvent, the mass ratio of the plasticizer to the binder ranges from 3: 5 to 4: 5. By regulating and controlling the proportion of the dispersing agent in the AlN ceramic slurry and the solid content of the high-purity AlN powder, the slurry has excellent flowability, dispersity and stability while maintaining high solid content, and is suitable for a tape casting process. The AlN ceramic substrate prepared through sintering is high in density and excellent in heat conductivity, and engineering application can be achieved.

Disclosed is a polycrystalline ceramic dielectric comprising: crystal grain bulks made of a barium titanate-based ceramic; and grain boundaries comprising interfaces between the crystal grain bulks, wherein the composition of the grain boundaries is controlled using dopants. By controlling the grain boundary composition using dopants so that the dopants are distributed across a width of 5 nm or less and using a nano-sized, fine-grained barium titanate-based ceramic precursor, the grain boundary structure within the polycrystals may maintain electroneutrality, and their ferroelectricity may be controlled, thereby allowing for smoother polarization reaction. Accordingly, the present disclosure provides polycrystalline ceramic dielectrics that have dielectric properties such as high permittivity and low dielectric losses in a wide frequency range, a small amount of reduction in electric field-dependent relative permittivity, high temperature stability, non-reducibility under a reduction sintering condition, and resulting high insulation resistance, and a preparation method therefor.

The invention relates to the technical field of key parts of new energy automobiles, and provides a ceramic packaging insulating multi-layer laminated copper alloy busbar and a preparation method of the ceramic packaging insulating multi-layer laminated copper alloy busbar. Structural filling is carried out in a mold to form a multi-layer powder preform which is coated by outer-layer ceramic insulation powder and in which internal copper alloy conductive powder is isolated by interlayer ceramic insulation powder, the multi-layer powder preform is integrally pressed into a compact green body, and the compact green body is molded into the ceramic packaging insulation multi-layer laminated copper alloy busbar through co-sintering. The ceramic packaging insulating multi-layer laminated copper alloy busbar comprises at least one copper alloy conducting layer with the thickness of 0.05 mm and at least one copper alloy conducting layer with the thickness of 0.5 mm. The core defects of a traditional laminated busbar in the aspects of thermal management, interface reliability and structural precision can be synergistically solved, and the laminated busbar with excellent conductivity, insulation, heat dissipation, mechanical strength and long-term reliability is prepared.

The application provides a rare earth doped electric porcelain and a preparation method and application thereof. The electric porcelain comprises the following preparation raw materials: aluminum oxide, ceramic powder, quartz, titanium white powder, a rare earth dopant, a dispersing agent and a forming agent. The forming agent comprises the following preparation raw materials: modified aluminum silicate, silicone rubber, isopropyl trioleic acyloxy titanate and isocyanate. The rare earth dopant comprises the following preparation raw materials: diyttrium trioxide and lanthanum stearate. In the application, the electric porcelain material with excellent mechanical properties is prepared through the collocation of the preparation raw materials.

The present invention provides: a multilayer glass ceramic dielectric material which has low dielectric characteristics and high mechanical strength in a high frequency range of 20 GHz or more; a sintered body; and a circuit member for high frequency use. A multilayer glass ceramic dielectric material according to the present invention is characterized by having a multilayer structure wherein at least an outer layer, an inner layer and another outer layer are sequentially stacked, and is also characterized in that: the outer layers are formed of a material which has a relative dielectric constant of 5.5 or less at a measurement temperature of 25°C at a frequency of 28 GHz after being sintered; and the inner layer is formed of a material, the thermal expansion coefficient of which after sintering is higher than the thermal expansion coefficient of the outer layers after sintering.

To provide a ceramic electrode material made of barium titanate, a ceramic capacitor using the same, and a method for manufacturing the same. [Solution] The ceramic electrode material of the present invention is made of barium titanate having oxygen vacancies and having a cubic crystal structure in a temperature range of at least 300K to 400K. The method for producing the ceramic electrode material made of oxygen-vacant barium titanate of the present invention includes annealing a barium titanate raw material having a stoichiometric composition in a vacuum in the presence of a Group 2 element metal.

A glass ceramic structure 100 has first ceramic layers 11 which each contain a crystal 13, and a second ceramic layer 12 which contains the crystal 13 and has a different content of the crystal 13 from the first ceramic layers 11, the glass ceramic structure 100 being characterized in that: the second ceramic layer 12 is present on a surface of the glass ceramic structure 100, or alternatively is present between the first ceramic layers 11 in the thickness direction; the relationship between a shortest distance D1 in the thickness direction from the surface of the glass ceramic structure 100 to the second ceramic layer 12 and a layer thickness t of the second ceramic layer 12 satisfies (shortest distance from surface) / (layer thickness of second ceramic layer) ≤ 10; the composition of the first ceramic layers 11 contains 45% by weight to 77.5% by weight of SiO2, 5% by weight to 20% by weight of B2O3, 2.6% by weight to 20% by weight of Al2O3, 2.7% by weight to 20% by weight of ZnO, 0% by weight to 3.4% by weight of CuO, and 0% by weight to 10% by weight of BaO; the crystal 13 is composed of at least one substance that is selected from the group consisting of Al2O3, ZnSi2O4, ZnO, ZnAl2O4, BaAl2Si2O8, ZnTiO3, Al2TiO5, TiO2, Mg2SiO4, MgSiO3, and MgO; the ratio of the cross-sectional area occupied in a ceramic cross-section by the crystal 13 present in the second ceramic layer 12 is larger than the ratio of the cross-sectional area occupied in the ceramic cross-section by the crystal 13 present in the first ceramic layer 11, the difference therebetween being 10% by area to 75% by area.

The invention discloses a raw material for producing an extra-high voltage large-tonnage insulator and a preparation method, and relates to the technical field of ceramic materials and preparation thereof.The raw material comprises porcelain sand and glaze, the porcelain sand is prepared from, by weight, 30%-50% of pug, 13%-18% of aluminum oxide powder, 10%-15% of glaze powder, 4%-9% of talc, 8%-18% of clay and 4%-9% of feldspar; the glaze is prepared from the following components in percentage by weight: 26 to 32 percent of feldspar, 23 to 28 percent of glaze powder, 3 to 7 percent of mineralizer, 11 to 16 percent of talc, 4 to 8 percent of clay for glaze, 4 to 8 percent of blank mud, 3 to 7 percent of calcined clay, 5 to 10 percent of opacifier and 0.2 to 0.7 percent of colorant. By optimizing the raw material formula and the preparation process, the mechanical strength, the insulating property and the weather resistance of the insulator are improved.

The invention relates to a flexible ceramic nanofiber electrode and a preparation method and application thereof, conductive paste is loaded on a flexible ceramic nanofiber membrane after plasma treatment, and the flexible ceramic nanofiber electrode is obtained through calcination. The flexible ceramic nanofiber electrode suitable for a wide temperature range shows good bendability, conductive stability and thermal stability in an environment of-196 to 800 DEG C.

The invention relates to the technical field of inorganic non-metal insulating materials, in particular to an insulating material resistant to high voltage breakdown at high temperature and a preparation method thereof.The preparation method comprises the steps of raw material pretreatment and homogeneous mixing, forming and low-temperature pre-sintering, high-temperature densification sintering, gradient cooling annealing and finish machining. By optimizing the combination of the base material, the reinforcing phase material and the functional modifier, the insulating material has excellent high voltage breakdown resistance and high volume resistivity in a high-temperature environment, and the reliability and stability of the material under extreme conditions are ensured; by adopting the preparation method, high densification and microstructure optimization of the material are realized, so that the mechanical strength and electrical performance consistency of the insulating material are improved.

The present invention relates to an insulating film composition for a ceramic heater silicon carbide substrate and, more specifically, comprises: a first agent comprising 30-50 wt% of glass frit, 20-40 wt% of aluminum oxide, 1-5 wt% of ethyl cellulose and 20-30 wt% of 3-hydroxy-2,2,4-trimethylpentyl isobutyrate; and a second agent comprising 20-50 wt% of glass frit, 8-15 wt% of ethyl cellulose, 0.5-2 wt% of aluminum oxide, 40-65 wt% of 3-hydroxy-2,2,4-trimethylpentyl isobutyrate and 0.1-1 wt% of dimethyl phthalate. A wafer-sized SiC substrate having a thickness of 2t or less, excellent insulating properties and minimized warpage can be manufactured using the insulating film composition for a ceramic heater silicon carbide substrate, of the present invention, and can be applied to a thick-film heater, and thus can maximize the productivity of a product produced using the heater.

The invention provides a waste electrical porcelain recycling treatment method and a porcelain insulator prepared by the waste electrical porcelain recycling treatment method. The method comprises the following steps: firstly, removing pollutants in waste electrical porcelain, and dividing the waste electrical porcelain into high (greater than or equal to 48%), medium (32-48%) and common (less than or equal to 32%) according to the content of Al2O3; then crushing by a jaw crusher and an impact crusher until the diameter is less than 10mm, feeding into a ball mill with online particle size detection and automatic material returning functions for grinding, and automatically separating out electric porcelain powder slurry with the particle size being less than 300 meshes; and carrying out iron magnetic separation and filter pressing dehydration to obtain a mud cake. And compounding 10-20 parts by weight of the waste electric porcelain powder, 80-90 parts by weight of an electric porcelain blank and 0.8-2 parts by weight of a composite plasticizer, molding and sintering to obtain the porcelain insulator. According to the method, accurate grading resource utilization of the waste electric porcelain is achieved, and the mechanical strength and the product percent of pass of the electric porcelain insulator are effectively improved while the raw material cost is remarkably reduced.

The invention discloses porcelain sand for extra-high voltage insulator production and a preparation method, the porcelain sand comprises the following components: 30-50 parts of formula mud, 13-18 parts of alumina powder, 10-15 parts of glaze powder, 4-9 parts of talc, 3-8 parts of first-class clay, 5-10 parts of second-class clay, and 4-9 parts of albite, the formula mud is prepared from the following components in parts by weight: 45 to 60 parts of kaolin, 25 to 30 parts of quartz sand, 10 to 15 parts of potassium feldspar, 8 to 10 parts of bentonite and 0.8 to 1.2 parts of carboxymethyl cellulose; the preparation method of the porcelain sand comprises the steps of ingredient grinding, magnetic separation for iron removal, filter pressing for dehydration, vacuum pugging, drying for sand making and high-temperature sintering. The porcelain sand has extremely high high temperature resistance, arc resistance and aging resistance, can be adhered to the root of an insulator blank through glue and is sintered and molded together with the blank, so that the root of the insulator can be better connected with a fitting through cement, and the overall mechanical strength and electrical performance of the insulator are improved.

The invention provides a PZT-based energy storage ceramic material with a core-shell structure as well as a preparation method and application of the PZT-based energy storage ceramic material. The PZT-based energy storage ceramic material has excellent characteristics of high polarization intensity and high breakdown electric field; the preparation method comprises the following steps: coating PBLZST tetragonal phase powder prepared by adopting a solid phase method with PLZST orthorhombic phase sol prepared by adopting a sol-gel method, and sintering at high temperature, so that ceramic grains form a core-shell microstructure with a strong polarization core and a high breakdown shell. The polarization intensity of the prepared PZT-based energy storage ceramic material can reach 35-55 [mu] C / cm < 2 >, and the breakdown electric field is about 350-400 kV / cm. The core-shell microstructure promotes the synchronous improvement of the polarization intensity and the breakdown electric field of the material. Therefore, the energy storage performance of the PZT-based energy storage ceramic material is remarkably improved at room temperature, and the recoverable energy storage density can reach about 8.96 J / cm < 3 >.

To provide a dielectric composition less likely to cause pulse pressure-resistant failure than before, and a multilayer ceramic electronic component containing the dielectric composition.SOLUTION: A dielectric composition comprises a dielectric particle containing a main component (1.020<m) expressed by a composition formula [(CaxSr(1-x))O]m[(TiyHfzZr(1-y-z))O2], a grain boundary phase located between the dielectric particles, and a segregated phase containing at least Ca, Si, and O (oxygen). Among the segregated phases, a segregated phase that further contains Mn is defined as a first segregated phase, and a segregated phase that does not substantially contain Mn is defined as a second segregated phase. Further, the number of the first segregated phases included in a predetermined cross-sectional area of the dielectric composition is N1, and the number of the second segregated phases is N2, the dielectric composition satisfies 0.23<(N1 / (N1+N2))≤1.00.SELECTED DRAWING: Figure 2

An aspect of the present invention provides hollow silica particles that exhibit a suppressed increase in viscosity after kneaded with a resin, have a high strength, and can achieve a good balance between handleability and a function thereof. Hollow silica particles in accordance with an aspect of the present invention have, in a particle size distribution based on volume distribution and measured by a laser diffraction scattering method, at least one peak in a range of not less than 0.1 µm and not more than 0.5 µm and at least one peak in a range of more than 0.5 µm and not more than 5.0 µm, particles on a side of the at least one peak in the range of 0.1 µm to 0.5 µm based on volume distribution accounting for not less than 60% by volume of the hollow silica particles, the hollow silica particles having a maximum particle diameter (D100) of not more than 10 µm, wherein 0.8<(A / B), where A is an apparent density of the hollow silica particles before kneading with a resin, and B is an apparent density of the hollow silica particles after kneading with the resin.

The invention relates to a flexible watch component for the oscillator mechanism of a watch movement, the component comprising at least one part made of a composite material (1), the composite material (1) comprising a matrix (2) and a multitude of nanotubes or nanowires (3) distributed in the matrix (2), the nanotubes or nanowires (3) being juxtaposed and arranged substantially parallel to an axis (A) substantially perpendicular to the plane (P) of the component, the matrix comprising a flexible filling material (4) for filling the interstices between the nanotubes or nanowires (3), the filling material (4) comprising at least in part a thermal compensation material whose coefficient of thermoelasticity (CTE) is of opposite sign to that of the other materials of the composite material (1).

This invention relates to a video data acquisition logging cable. The video data acquisition logging cable includes an outer sheath, multiple conductors wound around the inside of the outer sheath, and a filler material filling the gaps between the outer sheath and the conductors. Each conductor includes a hollow flexible tube, the hollow portion of which is filled with a first filler material. Multiple wire cores are arranged around the outer wall of the hollow flexible tube, and each wire core is wound around the outer wall of the hollow flexible tube. Two adjacent wire cores wound around the outer wall of each hollow flexible tube are spaced far apart. An outer sheath is also fitted over the hollow flexible tube, and the outer sheath wraps around the corresponding multiple wire cores on the hollow flexible tube. An elastic element is located inside the outer sheath and elastically connected to the inner wall of the outer sheath. An armor layer is fitted over the outer sheath. A sheath is also included. The video data acquisition logging cable provided by this invention has the advantages of high tensile strength, ensuring normal signal transmission, and long service life.

To provide a dielectric composition, a multilayer ceramic electronic component, a manufacturing method of a dielectric composition, and a manufacturing method of a multilayer ceramic electronic component, capable of achieving both a long life and the excellent temperature characteristics of capacity.SOLUTION: A dielectric composition includes: a main component containing barium titanate; a first additive containing zirconium in an amount of 2 at% or more and 10 at% or less with respect to titanium of the barium titanate; a second additive containing 0.2 at% or more and 3.5 at% or less of europium with respect to titanium of the barium titanate, and a content of a rear earth element other than the europium is less than that of the europium; a third additive containing 0.5 at% or more and 4.5 at% or less of manganese with respect to titanium of the barium titanate; and a fourth additive containing at least one of strontium and calcium in an amount of 0.1 at% or more and 3 at% or less with respect to titanium in the barium titanate.SELECTED DRAWING: Figure 6

The invention discloses a nanocrystalline composite ceramic insulating material and a preparation method thereof, and belongs to the field of nanocrystalline ceramic material preparation. Raw materials of the catalyst comprise the following components by mole percent: 40-50% of SiO2; 30%-38% of CaCO3 (calcium carbonate); 13% to 18% of Na2CO3; 0.5 to 2.5 percent of TiO2; zrO2: 0.5% to 2.5%; 1 to 3 percent of Al2O3; and 0.5 to 4.5% of K2O. The preparation method comprises the following steps: weighing the raw materials according to the proportioning requirement, fully mixing the raw materials, and carrying out ball milling treatment; keeping the temperature of the mixture at 850-950 DEG C for more than 2 hours, then keeping the temperature at the temperature not lower than 1450 DEG C for 60-90 minutes, then pouring the mixture into a preheated brass mold, and keeping the temperature at 500-550 DEG C and annealing for more than 10 hours; heat treatment is carried out in an air atmosphere through a two-step method, heat preservation is carried out at the temperature of 600-650 DEG C for a certain time, then heat treatment is carried out at the temperature of 650-700 DEG C, and the temperature interval between the heat treatment and the heat treatment is 50-100 DEG C. The nanocrystalline composite ceramic insulating material disclosed by the invention has more excellent mechanical strength and dielectric property, and is of great significance in promoting a power transmission and transformation system to develop towards a direction of higher voltage, longer distance and more reliability.

The invention discloses a BN-PI / BMI composite insulating material and a preparation method and application thereof, and belongs to the technical field of high-performance composite insulating materials and preparation thereof. The problems that the heat conductivity of an existing PI-based composite material is limited to be improved, the insulating property and the heat-conducting property are difficult to collaboratively optimize, and an efficient three-dimensional heat-conducting network construction method is lacked are solved. The BN / PI insulation paper layers and the BN / BMI adhesive layers are used for constructing a multi-layer composite structure, the BN / BMI adhesive layers are used as thermal bridges, BN filler in the adjacent BN / PI layers is effectively connected, the composite film with a three-dimensional heat conduction network penetrating through the thickness direction is successfully prepared, interlayer interface thermal resistance is remarkably reduced, and efficient cross-layer transfer of heat is achieved. Test results show that the in-plane thermal conductivity of the obtained composite film can reach 7.62 W.m <-1 >. K <-1 >, and is increased by about 38 times compared with that of a pure PI material (about 0.2 W.m <-1 >. K <-1 >).

The invention discloses a three-dimensional whisker network reinforced mesoporous composite anti-condensation insulating material and a preparation method thereof, and belongs to the technical field of insulating materials, the material is composed of 18%-22% of a three-dimensional whisker network reinforced phase, 70%-76% of a silicon oxide-aluminum oxide composite mesoporous matrix, 3%-5% of an anti-condensation functional component and 0.5%-1.5% of an interface coupling agent KH550, the mesoporous matrix is in bimodal pore size distribution, and the anti-condensation component is a composite system of fluorosilane and double nanoparticles. According to the preparation method, material performance optimization is achieved through the synergistic steps of in-situ whisker network construction, sol-gel compounding, ALD transition layer deposition, radiation crosslinking, plasma modification and the like. The dielectric strength of the obtained material is larger than or equal to 27 kV / mm, the compression strength is larger than or equal to 4.2 MPa, the 72-hour condensation inhibition rate in the 95% RH environment is larger than or equal to 96%, the high-humidity 3000-hour dielectric attenuation rate is smaller than or equal to 4%, and the material can tolerate the salt mist extreme environment, is suitable for long-acting insulation protection of electrical equipment in the high-humidity and strong-corrosion scenes such as ocean platforms and chemical industrial parks and has remarkable industrial application value.

The present invention is a glass ceramic comprising a glass containing Si, B, Al, and Zn, and an aggregate, the glass having an SiO2 content of 20-55 wt%, a B2O3 content of 15-30 wt%, a SiO2 / B2O3 weight ratio of 1.21 or more, and an Al2O3 / ZnO weight ratio of 0.8-1.3, and the aggregate having an average particle size of 1-10 [mu] m with respect to the weight of the glass ceramic, the average particle size of 1-10 [mu] m, and the average particle size of 1-10 [mu] m with respect to the weight of the glass ceramic, the average particle size of 1-10 [mu] m, the average particle size of 1-10 [mu] m, the average particle size of 1-10 [mu] m, and the average particle size of 1-10 [mu] m. The glass contains 20 to 50 wt% of SiO2, 1 to 10 wt% of TiO2, 3 wt% or less of ZrO2, and 1 wt% or less of ZnO, and the content of TiO2, ZrO2, SnO2, and SrO in the glass is 0 to 5 wt%.

To provide a new ferroelectric material exhibiting ferroelectricity by a new mechanism.SOLUTION: The ferroelectric material has a combination of crystallographic ferrochiral and ferroaxial order, or a combination of crystallographic antiferrochiral and antiferroaxial order.SELECTED DRAWING: Figure 5

The invention provides a PCB embedded power module and a forming method thereof, the PCB embedded power module comprises a power heating unit (1), two opposite sides of the power heating unit (1) are provided with power copper layers (11), and the power copper layers (11) are provided with isolation grooves; the heat conduction insulating layer is located on at least one side of the power heating unit (1), the heat conduction insulating layer comprises a ceramic material layer (2) and a heat conduction insulating film (3) which are arranged in a stacked mode, the ceramic material layer (2) is located on one side close to the power copper layer (11), the ceramic material layer (2) is attached to the outer surface of the power copper layer (11) and the inner surface of the isolation groove, and part of the heat conduction insulating film (3) is filled in the isolation groove. The ceramic material layer is additionally arranged, so that the heat dissipation performance of the PCB embedded power module is improved; the thickness of the heat-conducting insulating film can be reduced, so that the thermal resistance of the heat-conducting insulating layer is greatly reduced, and the performance of the product is greatly improved.

To provide a dielectric composition that is resistant to cracking and chipping, and a laminated ceramic electronic component containing the dielectric composition.SOLUTION: A dielectric composition includes dielectric particles containing Ca or / and Sr, at least one selected from Ca and Sr, and a segregation phase containing Mn, Si, and O.SELECTED DRAWING: Figure 2