327results about "Ceramics" patented technology

The invention relates to the technical field of insulators, and provides a high-strength insulator and a preparation method thereof.The high-strength insulator is prepared from, by weight, 20-30 parts of aluminum oxide, 10-15 parts of kaolin, 6-10 parts of aluminum nitride, 15-20 parts of mullite, 5-10 parts of mica powder, 3-6 parts of titanium dioxide and 10-15 parts of modified silicon nitride whiskers; the modified silicon nitride whiskers are obtained by modifying silicon nitride whiskers with rare earth oxide. According to the technical scheme, the problem of low insulator strength in the prior art is solved.

The invention relates to an electrically insulating composite material (40), characterized in that the material is a composite material comprising a matrix (42) made of an elastomer or a polymer, and inclusions (41) providing the material with a thermal conductivity of greater than 0.6 W / mK at room temperature, in particular greater than 1.5 W / mK at room temperature.

The invention discloses an extreme-environment-resistant long-service-life power cable which comprises a main body, and the main body comprises a cable sheath, a shielding layer, an insulating layer and a conductor layer from outside to inside in sequence. The shielding layer comprises a shielding net and a metal foil, the shielding net is of a three-dimensional net structure formed by mixing and weaving copper magnesium alloy wires and shape memory alloy, the shielding net wraps the insulating layer in all directions, and a graphene coating is coated between the insulating layer and the shielding net; the metal foil is tightly attached to the surface of the shielding net, the outer surface of the metal foil is subjected to micro-arc oxidation treatment to generate a protective layer, and the inner surface of the protective layer is coated with a self-cleaning coating. According to the self-adaptive shielding net in the shielding layer, the copper magnesium alloy wires and the memory alloy wires are mixed and woven into a three-dimensional net structure, the memory alloy wires can drive the shielding net to deform in a self-adaptive mode, the state of tightly wrapping the insulating layer is maintained, the shielding effectiveness is stable in cooperation with the metal foil, and the shielding effect is stable in various complex electromagnetic environments of extreme environments. And the cable transmission can be effectively prevented from being interfered.

The invention discloses an insulating ceramic material, a preparation method thereof and application of the insulating ceramic material in a semiconductor heater. The insulating ceramic material comprises the following raw materials in parts by weight: 70-80 parts of aluminum oxide, 20-30 parts of boron nitride, 1-2 parts of magnesium oxide, 2-3 parts of quartz fiber powder and 4-6 parts of a modifier, the preparation method of the modifier comprises the following steps: reacting sodium alginate with 3, 3 '-dithiobis (4-aminobenzoic acid) to generate a first intermediate, reacting the first intermediate with polyacrylic acid to generate a second intermediate, and generating the modifier from the second intermediate under the action of aluminum chloride. The insulating ceramic material disclosed by the invention has excellent mechanical property, heat-conducting property and insulating property, and can remarkably improve the working performance of the semiconductor heater and prolong the service life of the semiconductor heater when being applied to the semiconductor heater.

An electrical feedthrough is providing that includes a base body, an insulating material, an electrical conductor, a creepage distance extension, and a sealing member. The base body has a through opening extending therethrough. The insulating material is in the through opening. The electrical conductor extends through the insulating material such that a portion of the electrical conductor protrudes from the insulating material. The creepage distance extension surrounds at least a section of the portion. The sealing member is between the insulating material and the creepage distance extension. The sealing member is a seal material that is at least partially mineral and crystalline.

The invention relates to the technical field of wires, in particular to a high-strength, high-conductivity and corrosion-resistant ceramic aluminum alloy wire and a production process, and the wire comprises a wire body which is composed of a reinforcing core, a stranded wire layer and a ceramic layer. According to the high-strength, high-conductivity and corrosion-resistant ceramic aluminum alloy conductor and the production process, a ceramic layer is formed on each single wire, and an insulating layer can be formed between the single wires, so that an insulating and shielding effect is achieved; corona and electromagnetic interference can be reduced through the ceramic layer; the pressure sensor modules which are connected in series are mounted on the inner side limiting ring on the inner side of the inner detection pipe, so that the bending change of different positions of the wire can be monitored in real time according to the change of the inner pressure; and the ceramic layer is formed through an electrochemical oxidation process, so that the lead has excellent corrosion resistance.

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.

The invention belongs to the technical field of aluminum oxide ceramics, and particularly relates to a high-strength 99 aluminum oxide ceramic as well as a preparation method and application thereof. The boehmite and the hydrotalcite are used as main components of a binder, the boehmite and hydrotalcite composite sol is obtained by adopting a specific preparation method, and the boehmite and hydrotalcite composite sol is applied to a preparation process of aluminum oxide ceramics, so that an aluminum oxide ceramic material with high strength and high density can be obtained. Besides, the sintering aid adopted by the invention can react with MgO and Al2O3 generated by decomposition in the binder to generate a low-melting-point liquid phase, so that redistribution of substances among particles and filling of pores are facilitated, and the density and the dielectric property are further improved.

The dielectric composition of the present invention contains a strontium component, a sodium component, a niobium component, a calcium component, an yttrium component, and a zirconium component. The molar ratios (%) of the respective components in the dielectric composition in terms of oxide satisfy: 14.7 ≤ strontium component ≤ 20.7, 13.5 ≤ sodium component ≤ 23.5, 60.1 ≤ niobium component ≤ 63.2, 0.66 ≤ calcium component ≤ 2.93, 0.53 ≤ yttrium component ≤ 2.23, and 0.48 ≤ zirconium component ≤ 2.27.

The embodiment of the invention provides a resin composition as well as a preparation method and application thereof. The resin composition comprises the following components in percentage by mass: 30-60% of a cycloolefin polymer, 3-15% of an olefin polymer and / or a modified olefin polymer and 35-70% of filler, wherein the filler comprises a titanate filler and a non-titanate filler, the mass percent of the titanate filler is 10%-40%, the mass percent of the non-titanate filler is 0-40%, and the dielectric constant of the non-titanate filler is greater than 20. The resin composition provided by the embodiment of the invention has high dielectric constant, low dielectric loss and relatively high heat resistance and impact resistance, can be used as a dielectric material in the field of communication, and can meet the requirements of mechanical properties and heat resistance while improving the signal transmission efficiency.

The insulation covered conductive wire includes: a conductive wire; a non-adherent, laterally wound insulation member which covers an outer circumference of the conductive wire without adhering thereto, and is formed by laterally winding a plurality of first ceramic fibers configured from a plurality of first ceramic strands in an extending direction of the conductive wire without being in close contact and adhering to each other; and a non-adherent braided insulation member which covers an outer circumference of the non-adherent, laterally wound insulation member without adhering thereto, and is formed by braiding a plurality of second ceramic fibers configured from a plurality of second ceramic strands without being in close contact and adhering to each other.

The invention discloses an underground heater insulating material capable of improving the insulating property through zirconium doping and a preparation method thereof. The insulating material is an insulating ceramic material prepared from a mixed material containing magnesium oxide, a doping material containing a zirconium element and a modifying reagent through ball milling, drying granulation, aging forming and plastic removal sintering. As the doped material containing the zirconium element and magnesium oxide can form a solid solution, crystal lattices of magnesium oxide crystals are activated, the compact degree and strength of the material are improved, and the insulating property is improved; the modification reagent reduces the vacancy defect of MgO crystal grains, moisture absorption is not easy to form an MgO-OH structure, and the volume resistivity is improved; compared with a high-purity magnesium oxide ceramic material, the prepared insulating ceramic material has good high-temperature insulating property and can be used as an insulating material for an underground high-power heater.

An electrical feedthrough (10) is disclosed that includes a substrate (12) with at least one through opening (13), at least one electrical conductor (18) disposed within the through opening (13) and secured within the through opening (13) via at least one insulator (20), which closes the through opening (13) and provides a seal against the conductor (18) and the walls of the through opening (13). The insulator (20) has at least one retention section (22) that seals against and retains the at least one electrical conductor (18), the insulator (20) has at least one creepage extension (26) surrounding, at a distance, a portion of the electrical conductor (18) that protrudes beyond the retention section (22), the at least one creepage extension (26) being integral with the at least one retention section (22) or being connected to the at least one retention section (22) in a material-bonding manner, in particular by glass fusion or bonding, the substrate at least partially surrounding the at least one creepage extension (26), and the substrate (12) being in contact with the creepage extension (26). Further aspects of the invention relate to feedthrough assemblies including such a feedthrough (10) as well as uses of the electrical feedthrough (10).

The invention relates to a ceramic insulating material as well as a preparation method and application thereof. The ceramic insulating material comprises the following raw materials in parts by mass: 62-78 parts of alumina powder; 12 to 18 parts of glass powder; 1-5 parts of quartz powder; 3 to 5 parts of wollastonite powder; 3-6 parts of calcium oxide powder; 1-6 parts of talcum powder; and 2-6 parts of boric acid powder. According to the ceramic insulating material provided by the invention, the types and contents of the raw material components are strictly controlled, the porosity of the ceramic insulating material can be reduced, and the compactness of the material can be improved, so that the electrical strength and mechanical strength of the material are improved, the ceramic insulating material has excellent electrical insulating performance, and the stability of the ceramic insulating material during long-term high-temperature work is ensured; and on the other hand, the raw materials with specific composition and content can also reduce the water absorption rate of the ceramic insulating material, meet the requirement that the long-term waterproof grade of the material reaches IP68, and effectively solve the problem that the dielectric loss is relatively high after the ceramic insulating material is affected with damp.

To provide a dielectric ceramic composition capable of improving reliability, and to provide a multilayer ceramic capacitor comprising the same.SOLUTION: A dielectric ceramic composition according to one embodiment of this invention includes a BaTiO3-based base material main ingredient and an accessory ingredient, wherein: the accessory ingredient includes a trivalent lanthanide rare earth element A and terbium (Tb) as rare earth elements; and a ratio (Tb / A) of a content of terbium (Tb) to the content of the trivalent lanthanide rare earth element A satisfies 0.15≤Tb / A<0.50. A multilayer ceramic capacitor comprising the same is also provided.SELECTED DRAWING: Figure 3

The invention discloses an underground heater insulating material capable of improving the insulating property through manganese doping and a preparation method thereof. The insulating material is an insulating ceramic material prepared from a mixed material containing magnesium oxide, a doping material containing a manganese element and a modifying reagent through ball milling, drying granulation, aging forming and plastic removal sintering. The doping material containing the manganese element and magnesium oxide can form a solid solution, so that crystal lattices of magnesium oxide crystals are activated, the compact degree and strength of the material are improved, and the insulating property is improved; the modification reagent reduces the vacancy defect of MgO crystal grains, moisture absorption is not easy to form an MgO-OH structure, and the volume resistivity is improved; compared with a high-purity magnesium oxide ceramic material, the prepared insulating ceramic material has good high-temperature insulating property and can be used as an insulating material for an underground high-power heater.

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.

The invention relates to a preparation method of a high-strength and high-toughness coating rod type insulator for a high-speed rail contact net, and relates to the field of electrified traffic of high-speed railways. The high-strength and high-toughness coating rod type insulator comprises a porcelain insulator main body and an integrated metal flange body formed by an ETV coating and the porcelain insulator main body, the porcelain insulator main body is prepared by mixing calcined high bauxite, feldspar, kaolin, zirconite, quartz, cordierite, ceramic short fibers, clay and the like, adding the mixture into a ball mill, uniformly mixing to form slurry, sieving to remove iron, squeezing the slurry, pugging the slurry, performing high-pressure vacuum treatment, mechanically pressing to form a blank, cutting, drying, glazing, and firing at a high temperature of 1250 DEG C. The porcelain insulator main body is prepared by the steps of appearance detection, good quality detection and the like. By adopting a zirconium-aluminum composite ceramic matrix preparation technology, the composite material has the characteristics of high density, high strength, good toughness and small dispersity, the bending load tolerance strength is greater than or equal to 25KN / cm < 2 >, the torque load is greater than or equal to 15KN. M, and the composite material can completely meet the technical requirements of use of porcelain insulators in high-voltage power transmission grids of high-speed railways.

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 invention relates to a bendable insulating ceramic shell and a preparation method thereof. The bendable insulating ceramic shell is formed by nesting a plurality of special-shaped ceramic tube shells, and the nested adjacent special-shaped ceramic tube shells can freely rotate and do not separate from each other; the special-shaped ceramic tube shell is provided with a through hole through which a cable can be inserted; and the bendable insulating ceramic shell is made of one material selected from the group consisting of Al2O3, Y3Al5O12, AlN, MgO, Al2O3 / MgO and BeO. The insulating ceramic shell provided by the invention has the characteristic of being bendable, not only can provide great convenience for laying of the cable in a narrow space, but also can effectively inhibit damage of environmental impact such as vibration to the brittle ceramic structure.

The invention provides a method for manufacturing an aluminum oxide insulator resistant to 300kV direct-current voltage. The method comprises the following steps: step S1, performing isostatic pressing to form a cylindrical ceramic green body; s2, processing the shape of the green material, and turning an umbrella skirt; s3, sintering the processed green body material into ceramic to form a cooked body; s4, the size of the cooked blank is subjected to finish machining, upper and lower connecting end faces and hole sites are machined, and a ceramic insulation column is formed; s5, a metal top plate and a metal bottom corner are machined; s6, a metal top plate and a metal bottom corner are assembled at the upper end and the lower end of the ceramic insulation column respectively; and S7, spraying an insulating layer on the surface of the ceramic insulating column. By adopting the ceramic green body made of high-purity aluminum oxide, the whole ceramic insulation column is integrally sintered and formed, the bearing effect is better, the insulation performance is better, the total height design size is reduced, the bearing requirement is met, and meanwhile the machining and assembling cost is saved.

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.

According to the high-temperature-resistant power cable and the preparation method thereof, the high-temperature-resistant power cable comprises at least one conductor core and an insulating layer wrapping the surface of the conductor core, the insulating layer comprises silicone rubber and a carbon-ceramic composite material, and the weight ratio of the silicone rubber to the carbon-ceramic composite material is (10-60): 1. According to the technical scheme, through reasonable compatibility of the silicone rubber and the carbon-ceramic composite material in the insulating layer, and the weight ratio of the silicone rubber to the carbon-ceramic composite material is set within the range of (10-60): 1, the high temperature resistance of the power cable can be greatly improved.

The present application relates to winding copper wire and its related products and the production equipment and method of winding copper wire, the winding copper wire has a layer of silicon carbide ceramic layer with the thickness range of 1-5um deposited on the outer peripheral surface of the wire body. The silicon carbide ceramic layer not only has good insulation performance, but also has dense hexagonal metallographic structure, good voltage resistance and ductility, so the winding copper wire of the present application can be applied to various occasions instead of enameled copper wire, and compared with enameled copper wire, it also has the characteristics of good heat conduction performance, high wire slot fullness rate after forming into a coil, less heat generated by eddy current on the copper wire, high temperature resistance, smaller motor volume under the same power, and greater current output under the same volume.

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.

A multilayer ceramic capacitor is provided. The multilayer ceramic capacitor comprises: a ceramic body, comprising a dielectric layer and a first inner electrode and a second inner electrode; and a first outer electrode and a second outer electrode, which are arranged on the outer surface of the ceramic body, wherein the dielectric layer comprises dielectric grains containing a dielectric ceramic composition, the dielectric ceramic composition comprises a main component of a matrix material and a subsidiary component, the subsidiary component comprises Dy and Nb as a first subsidiary component, and the main component of the matrix material comprises at least one compound selected from the following compounds: BaTiO3; (Ba 1‑x Ca x )(Ti 1‑ y Ca y )O3, where 0≤x≤0.3, 0≤y≤0.1; (Ba 1‑x Ca x )(Ti 1‑y Zr y )O3, where 0≤x≤0.3, 0≤y≤0.5; and Ba(Ti 1‑y Zr y )O3, where 0

The present disclosure relates to insulating electrode edge coating compositions and methods of making the same. Energy storage devices, such as lithium ion batteries, that utilize the insulating coating compositions are also described.