12results about How to "High breakdown strength" patented technology

This invention relates to the field of electronic packaging substrates, and particularly to an alumina ceramic substrate material, its preparation method, and its application. The alumina ceramic substrate comprises 90-99 wt% alumina and 1-10 wt% sintering aids. The sintering aids have the following composition: xB₂O₃·zSiO₂·yBi₂O₃, where 15≦x≦25, 50≦y≦70, 15≦z≦25, and x+y+z=100, where x:y:z is the mass ratio. The density of the alumina ceramic substrate is ≥3.8 g / cm³. 3 The alumina ceramic substrate of this invention has the following characteristics: surface roughness ≤ 0.35 μm, breakdown strength ≥ 35 kV / mm, bending angle ≥ 350 MPa, and thermal conductivity ≥ 25 W / m·K. It also features high density, uniform microstructure, good surface flatness, high mechanical strength, high breakdown strength, low dielectric loss, and high thermal conductivity.

The invention discloses an X8R type high-reliability ceramic dielectric material with a double-shell design and a preparation method and application thereof, and belongs to the technical field of electronic ceramic materials. According to the ceramic dielectric material, barium titanate is used as a main body material, at least one of Y2O3 and Dy2O3 is used as a first dopant, and at least one of MgO and MnO2 is used as a second dopant. The preparation method comprises the following steps: pre-sintering BaTiO3 and a first doping agent at a high temperature; and then adding a second doping agent for secondary mixing and high-temperature sintering. According to the method, a double-shell structure of a tetragonal phase crystal nucleus, a rare earth-rich inner shell layer and an Mg / Mn-rich outer shell layer is constructed in ceramic crystal grains. The high dielectric property of the BaTiO3 crystal nucleus is reserved, the rare earth-rich inner shell layer is used for inhibiting oxygen vacancy long-range migration, the Mg / Mn-rich outer shell layer is used for optimizing temperature stability, synergistic improvement of the high dielectric constant (epsilon r gt, 2200), X8R wide-temperature stability (delta C / C 25 DEG C is smaller than or equal to + / -15%, minus 55-150 DEG C) and high breakdown field strength (larger than or equal to 6.7 kV / mm) is achieved, and the high-dielectric-temperature-stability high-voltage-resistant MLCC is suitable for manufacturing the high-dielectric-temperature-stability high-voltage-resistant MLCC.

The application belongs to the technical field of electrical insulation materials and nanocomposite material preparation, and discloses a method for preparing aramid composite insulation film by sorting long halloysite nanotubes. In the method, the halloysite nanotube raw material is sorted by natural settlement in water to obtain long halloysite nanotubes, which are then compounded with aramid nanofibers, and the composite insulation film with a dense staggered layered structure is prepared through spray film forming, solvent replacement and heat pressing densification treatment. The obtained film has excellent mechanical properties, insulation properties and high-temperature stability, and is resistant to acid, alkali, salt and organic solvent corrosion, and has good moisture-proof characteristics after hydrophobic modification. The sorting process is green and environmentally friendly, does not require organic additives, has excellent comprehensive performance, and is suitable for high-end insulation fields such as dry-type transformers, new energy motors and aviation electrical appliances.

The application relates to the technical field of prefabricated cable joint, in particular to a prefabricated positive and negative tooth type cable joint which comprises a prefabricated cable intermediate joint, two cables butted at two ends of the prefabricated cable intermediate joint, a protection mechanism arranged outside the prefabricated cable intermediate joint, a gas storage mechanism mounted on the protection mechanism and a sealing monitoring structure mounted on the protection mechanism. Two cable sheaths symmetrically distributed are additionally arranged on two independent cable segments after being cut off, when the prefabricated cable intermediate joint is butted with two cable line heads and wrapped, rotation of multiple bidirectional screws drives the extrusion pad slide way until the anti-debonding pad forcibly seals the two cables, after the sealing shell is assembled with the two cable sheaths, the gas storage mechanism assembled on the sealing cover shell can provide gas protection for the wrapped part, so that environmental moisture invasion into the wrapped part is effectively avoided.

The application discloses a full-organic polymer dielectric film with a five-layer structure and a preparation method thereof. The dielectric film comprises five-layer films; the five-layer films comprise two low-loss high-breakdown layer films located at the outermost layers, two intermediate transition layer films arranged between the two low-loss high-breakdown layer films, and a high-dielectric layer film arranged between the two intermediate transition layer films; and the full-organic polymer dielectric film is prepared by bonding the five-layer films in a continuous hot-pressing process. The organic polymers with different properties are combined together by the method of multi-layer continuous hot-pressing, so that the advantages of each component can be fully exerted, the growth of the electric tree branches is inhibited by the differences between the layers of different components, and the breakdown strength is improved. The full-organic composite film has the advantages of high dielectric constant, high breakdown field strength and high discharge energy density.

The invention provides a high-energy-storage-density polypropylene-based nano composite film. The high-energy-storage-density polypropylene-based nano composite film is prepared from polypropylene-boron nitride composite particles and PCOE (at) PMMA (at) BaTiO3 double-shell structure nano particles through tape casting, irradiation and stretching. The composite film provided by the invention has high dielectric property and energy storage density. According to the invention, a quantifiable high-performance dielectric solution is provided for high-power application scenarios such as an electric vehicle inverter and pulse power equipment.

The invention discloses a dielectric film based on dielectric graphene coating modification, and belongs to the technical field of films. The core is a composite structure of a'graphene core-double-layer dielectric shell layer 'core-shell filler and a polymer matrix, the oxygen content of the graphene core is 5-8 at%, the sheet diameter is 50-200 nm, and the high polarization characteristic is reserved; the inner layer of the double-layer shell layer is a high-dielectric oxide, the outer layer is a high-insulation oxide, and the total thickness is 3-10nm; a core-shell filler is prepared through a sol-gel + ALD fine trimming process, and the core-shell filler is compounded with matrixes such as PVDF / PI and the like to form a film with the filling amount of 2-8 wt%; according to the design, electron tunneling is blocked, electric field distortion is corrected, and performance synergy is achieved, wherein the dielectric constant is larger than or equal to 21.5, the breakdown strength is larger than or equal to 402 kV / mm, the dielectric loss is smaller than or equal to 0.017, the tensile strength is larger than or equal to 56.9 MPa, and the energy density is 12-15 J / cm < 3 >. The contradiction between dielectric enhancement and loss and breakdown strength of a traditional composite material is solved, the method is suitable for high-density energy storage devices, flexible electronic devices and the like, and the technology is compatible with large-scale production.

The application provides a preparation method of a composite dielectric elastomer film and a dielectric elastomer film actuator. The preparation method comprises the following steps: step 1: mixing BTRU@CDs giant electro-rheological particles with an electro-rheological liquid dispersion phase to obtain a suspension; step 2: uniformly mixing silicone rubber with the suspension to obtain a composite dielectric elastomer prepolymer, wherein the mass ratio of the silicone rubber to the suspension is 15:1 to 1:1, and the mass ratio of the BTRU@CDs giant electro-rheological particles in the composite dielectric elastomer prepolymer is 5-40%; and step 3: film forming is performed on the composite dielectric elastomer prepolymer to obtain a composite dielectric elastomer film. The composite dielectric elastomer film prepared by the preparation method of the composite dielectric elastomer film has better actuating performance, better mechanical performance and better cycle stability than traditional rubber elastomers. The problems of high driving voltage, large pre-stretching ratio, limited actuating strain, poor fatigue resistance and easy breakdown of existing dielectric elastomer materials are solved.

This invention discloses a Ca2Nb2O7 glass-ceramic material with excellent energy storage efficiency and its preparation method. The method includes: Step 1, mixing Na2CO3, K2CO3, BaCO3, SrCO3, CaCO3, Bi2O3, TiO2, Nb2O5 and SiO2 evenly to obtain mixture A; Step 2, adding mixture A into a crucible preheated to 1100-1300℃, then raising the temperature to 1450℃ and holding it at that temperature to completely melt mixture A. The process continues until no more bubbles are generated, resulting in a melt. This melt is then poured into a mold preheated to 200°C, and after molding, product B is obtained. Step 3: Product B is transferred to an annealing furnace preheated to 500–600°C and held at that temperature. After cooling in the furnace, a glass sample is obtained. Step 4: The glass sample is placed in a muffle furnace and heated from room temperature to 800–1000°C at a rate of 5°C / min, and held at that temperature to crystallize the glass sample. After cooling in the furnace, Ca2Nb2O7 glass-ceramic material is obtained. This invention not only has a simple preparation process, but also produces Ca2Nb2O7 glass-ceramic with high breakdown strength and high energy storage efficiency.

The present application belongs to the technical field of synthesis of all-organic polymer dielectric film, and particularly relates to a copolymerized polyamide with dielectric function containing nylon 1 chain segment and a preparation method, the preparation method of the dielectric polyamide film containing nylon 1 chain segment comprising the following steps: synthesis of nylon 1 with different polymerization degrees, butane diacid anhydride end-capping nylon 1, and salt formation of the end-capped product (referred to as "PA1 diacid") and piperazine, copolycondensation reaction of piperazine-PA1 diacid salt and piperazine-dodecanedioic acid salt, and hot-pressing forming, etc. In the present application, the piperazine-PA1 diacid salt and the piperazine-dodecanedioic acid salt are copolycondensed through high temperature and high pressure, the high dielectric constant of the nylon 1 chain segment is combined with the unique low dielectric loss of the piperazine nylon, the nylon 1 is embedded into the piperazine nylon matrix as a dielectric function chain segment, and the dielectric polyamide film containing the nylon 1 chain segment is directly prepared through simple hot-pressing forming.

The application provides a polypropylene composite material and a preparation method and application thereof, and relates to the technical field of electrical materials. The application comprises the following steps: S1: dissolving polyetherimide in a solvent to form an electrospinning solution; S2: adding nano magnetic particles into the electrospinning solution to perform electrospinning; S3: collecting the same-direction nano fibers to perform hot pressing to form a functional layer; S4: hot pressing the functional layer and a polypropylene film in the order of functional layer-polypropylene film layer-functional layer to form a composite layer; and S5: performing directional magnetization on the composite layer to obtain the polypropylene composite material. The electrospinning technology is used to prepare the functional layer, which not only solves the problem of uniform dispersion of the magnetic particles in the polymer, but also provides abundant interface areas for charge capture through the construction of the nano fiber network. The problem of space charge accumulation in the polypropylene material under a high-voltage direct-current system is solved.

This invention discloses a polynorbornene imide insulating material, its preparation method, and its applications, belonging to the technical field of electrical insulation materials and their preparation. This invention solves the problem of poor insulation performance in existing polynorbornene imide dielectric films. This invention obtains FPNI by fluorinating polynorbornene imide (PNI), a polymer dielectric film with a wide bandgap and a high glass transition temperature organic rigid backbone. Furthermore, by doping FPNI with the wide bandgap organic molecule 4,4-dihydroxydicyclohexane (OH), not only is hydrogen bonding crosslinking between hydroxyl and fluorine atoms achieved, but the wide bandgap OH also brings higher electronic transition energy levels, resulting in a crosslinked polymer film with excellent insulation performance and a breakdown field strength of 619.53 MV / m.