158results about "Ceramics" patented technology

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 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 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.

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 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 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 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 fire resistant radiating coaxial cable that employs a high-silica fiberglass yarn spacer is described. The yarn material has mass fraction of silica (SiO2) between 95.0% and 96.5%, a mass fraction of aluminum oxide (Al2O3) greater than 3%, and a mass fraction of calcium oxide (CaO) less than 0.5%. The yarn can be wound in a low-helix-angle helix around the center conductor such that less than half fills the annular space between it and the outer conductor. The cable is configured to maintain a relatively coaxial relation between a center conductor and an outer conductor under intense fire conditions.

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.

An article of manufacture comprising a first section having a first dielectric material and a second section having a second dielectric material and provided on an outer surface of the first section. The second dielectric material of the second section is more flexible than the first dielectric material of the first section, and the second section comprises elements of an organic material located partially on an outer surface of the second section. A coaxial cable using the article of manufacture and a method of manufacturing of the article are also disclosed.

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 present invention relates to the technical field of electronic functional materials, and provides a strontium titanate-based giant dielectric ceramic material with dual donors co-doped at the A and B sites and a preparation method thereof. The present invention adopts a method of co-doping Sm at the Sr(A) site and Nb at the Ti(B) site, and combines nitrogen sintering to obtain a Sr(A)-based giant dielectric ceramic material with a chemical formula of Sr(B). 1‑ 1.5x Sm x Ti 0.097 Nb 0.003 The invention discloses a SrTiO3-based giant dielectric ceramic material with a dielectric constant of 0.018 (0<x≤0.018), which has a giant dielectric effect and good temperature stability of the dielectric constant, meeting the demand for dielectric materials for miniaturization of electronic components. In addition, the amount of dopants Nb2O5 and Sm2O3 used in the invention is relatively small, which can reduce production costs. At the same time, the preparation method provided by the invention has simple steps, good repeatability, high yield, low cost, and is convenient for commercial production.

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 discloses a microwave dielectric ceramic material and a preparation method thereof. The microwave dielectric ceramic material consists of the following components: a main crystalline phase raw material: 60-80% of BaTiO3 (barium titanate); a fluxing agent: 5%-15% of Bi2O3 (bismuth oxide); a doping agent: 0.1%-5% of Nb2O5 (niobium pentoxide); the additive comprises 1%-3% of MnO2 (manganese dioxide); 2%-5% of TiO2 (titanium dioxide); 1%-3% of Y2O3 (yttrium oxide); and 0.5%-2% of MoS2 (molybdenum disulfide). According to the microwave dielectric ceramic material and the preparation method thereof, the microwave dielectric ceramic material has extremely low dielectric loss (# imgabs0 # = 0.0022), so that the energy loss is greatly reduced in a microwave signal transmission process. In an actual communication system, such as a signal transmitting and receiving device of a 5G base station, a microwave element made of the material can effectively reduce attenuation of signals on a transmission path, the signals can reach a receiving end with higher strength and integrity, the communication quality is greatly improved, the bit error rate is reduced, and the service life of the microwave element is prolonged. And smooth proceeding of high-speed data services such as high-definition video transmission and rapid downloading of large files is ensured.

The invention relates to the technical field of cables, in particular to a halogen-free ceramic bead insulating water-blocking fire-resistant cable, which comprises a solid conductor made of a copper rod and used as a conductive core body of the cable; the ceramic insulating bead is filled between the solid conductor and the flat wrapping copper sealing sleeve, and the surface of the ceramic insulating bead is coated with talcum powder before filling, so that the ceramic insulating bead can slide between the conductor and the sealing sleeve; flatly wrapping a copper sealing sleeve, longitudinally wrapping through a copper strip, and carrying out argon arc welding joint forming; the water-blocking tape is spirally wrapped outside the flat wrapping copper sealing sleeve, and a water-blocking material of the water-blocking tape expands quickly when being affected with damp or meeting water to block a cable channel; the halogen-free flame-retardant outer sheath is extruded and coated outside the water-blocking tape, protects the cable and does not release toxic halogen acid gas in a fire disaster; and the cable sealing plug is used for plugging the cable end to prevent the insulating bead from falling off. The cable can meet the requirement of high fire resistance, does not generate toxic gas in case of fire, and has good water-blocking performance at the same time.

The invention belongs to the technical field of ceramic materials, and particularly relates to a large-size special-shaped silicon nitride-based ceramic support column and a preparation method and application thereof. The large-size special-shaped silicon nitride-based ceramic pillar is prepared from the following basic raw materials in percentage by mass: 70-85% of industrial alumina powder, 2-3.5% of a sintering aid, 2-5% of washed clay, 5-20% of micron silicon nitride powder, 3-5% of a nano filler, an additional dopant accounting for 0.1-0.6% of the mass of the basic raw materials, a water reducing agent accounting for 0.2-0.3% of the mass of the basic raw materials and 31-35% of the mass of the basic raw materials, the washed clay is clay which is dried after washing treatment. The silicon nitride-based ceramic pillar prepared by the invention is high in surface flashover voltage, low in dielectric loss and dielectric constant and high in electric breakdown resistance, and can be used as an internal insulation pillar of power equipment.

Method for electromagnetic isolation of an electromagnetic conductor comprises the following steps: - coating of said first electromagnetic conductor and with at least one insulating compound configured, in use, to electromagnetically isolate said conductor wherein said at least one insulating compound comprises at least one preceramic polymer and at least one photosensitive element, - irradiation with ultraviolet rays of the conductor coated with the insulating compound for a predetermined time, so as to allow the cross- linking of the preceramic polymer and to obtain the coated and electrically insulated electromagnetic conductor.

The invention discloses an extra-high voltage electroceramic green body synthetic pug and a preparation method thereof. The formula of the electroceramic green body synthetic pug comprises the following components: 6%-35% of tubular kaolin, 6%-30% of Yichun kaolinite ore, 12%-38% of calcined flint clay, 8-25% of potassium feldspar, 1-12% of a composite binder and 12%-32% of industrial alumina. Compared with the prior art, the invention adopts the formula of the electrical porcelain blank which has specific content components and is suitable for oxidizing flame and reducing flame firing, can realize better integral interaction, and obtains the post insulator on the basis of the oxidizing flame and reducing flame firing process; and meanwhile, the prepared product post insulator is high in strength and meets the performance requirements of extra-high-voltage electric porcelain.

Provided in the embodiments of the present application are a resin composition, and a preparation method therefor and the use thereof. The resin composition comprises the following components in percentages by mass: 30-60% of a cycloolefin polymer, 3-15% of an alkene polymer and / or a modified alkene polymer, and 35-70% of a filler, wherein the filler comprises a titanate filler and a non-titanate filler, the mass percentage of the titanate filler is 10-40%, the mass percentage 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 in the embodiments of the present application has a high dielectric constant, low dielectric loss, and relatively high heat resistance and impact resistance; and when being used as a dielectric material in the field of communication, the resin composition can improve signal transmission efficiency and also meet the requirements of mechanical properties and heat resistance.

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 discloses an electric porcelain insulator with a wear-resistant hydrophobic structure and a preparation method thereof, and the method comprises the following steps: coating the surface of a ceramic matrix of the electric porcelain insulator with a ceramic precursor solution, and then carrying out drying and sintering to form a microporous ceramic layer; carrying out silane coupling agent activation treatment on the electric porcelain insulator with the microporous ceramic layer; immersing the electrical porcelain insulator activated by the silane coupling agent into a precursor solution containing Zn (NO3) 2 and hexamethylenetetramine for reaction, and then calcining to generate ZnO nanorods on the surface of the microporous ceramic layer; preheating the electrical porcelain insulator after the ZnO nanorod is generated, dipping the electrical porcelain insulator in a hydrophobic solution, and then performing drying and microwave curing to form a composite hydrophobic layer; and spraying the coating on the electric porcelain insulator after the composite hydrophobic layer is formed, and then curing to form the micro-nano texture layer. The problems that a traditional glaze hydrophobic layer is prone to falling off and poor in wear resistance are effectively solved, and the preparation method is controllable and easy to operate.