96results about How to "Breakdown field strength" patented technology

The invention provides a ultra-high temperature superconductive cable insulation electric character tester, comprising a low temperature pressure thermal insulation controller provided with a cover board, a hole at the center of the cover board, an insulation sleeve penetrating through the hole, a vacuum connector mounted on the cover board, a connecting tube for filling liquid nitrogen and a connecting tube for adding pressure which are mounted on the cover board, a test electrode in the low temperature pressure insulation container, and a conductive bar in the insulation sleeve, of which the upper end is connected with high voltage and the lower end is connected with the high voltage end of the test electrode. The ultra-high temperature superconductive cable insulation electric character tester can improve the electric property of the insulation material of a high temperature superconductive cable, under low temperature liquid nitrogen temperature, having simple operation.

The invention provides a method for improving gallium oxide semiconductor device ohmic contact. The method comprises the steps of conducting plasma etching surface treatment on a gallium oxide semiconductor and adjusting the roughness and oxygen vacancy on the surface of the gallium oxide semiconductor by controlling an etching technology, so that the surface roughness is within 1 micrometer, andthe oxygen vacancy is improved; growing a metal layer with a corresponding power function on the gallium oxide semiconductor after being subjected to the plasma etching surface treatment to form a semiconductor device with the ohmic contact. By means of the method, application and popularization of a gallium oxide material are facilitated; besides, according to a plasma etching method, the ohmic contact is improved to be not limited to the gallium oxide material, and the method can also be expanded and applied to other semiconductor devices.

The invention discloses a highly-oriented arrangement core-shell structure fiber polyvinylidene fluoride-based composite medium and a preparation method thereof, wherein the composite medium is formedby compounding a core-shell structure BZCT@SiO2NFs filling phase and PVDF, the BZCT@SiO2NFs is a core-shell fiber structure, the core layer is barium calcium zirconate titanate, and the shell layer is silicon oxide. According to the present invention, an inorganic fiber filling phase having a large aspect ratio is prepared by using a sol-gel method and an electrospinning technology, the inorganicfiber filling phase is encapsulated with silica, the obtained material and PVDF are compounded, and quenching treatment is performed to obtain the dense highly-oriented one-dimensional core-shell structure inorganic fiber-PVDF-based composite film; and the highly-oriented arrangement one-dimensional core-shell structure inorganic fiber-PVDF-based composite film medium can significantly improve the dielectric property, the breakdown property and the energy storage property so as to maintain the excellent electrical insulation property and the mechanical properties of the polymer.

The invention discloses an impregnating resin for manufacturing a nano composite major insulator for high-voltage motors. The impregnating resin is composed of nano powder, epoxy resin and a curing agent, wherein the weight percentage of each component is as follows: the weight percentage of the nano powder is 5-30%, the weight percentage of the epoxy resin is 40-85%, and the weight percentage of the curing agent is 2-55%. The viscosity of the impregnating resin is moderate before being cured, therefore, the impregnating resin is suitable for carrying out impregnating treatment on alkali-free glass cloth tapes, and the impregnating resin is used for manufacturing the nano composite major insulator for high-voltage motors with a voltage level of not less than 3 kV by using a VPI (vacuum pressure impregnation) process. The breakdown field strength of the nano composite major insulator for high-voltage motors, which is manufactured through the cooperation of the impregnating resin disclosed by the invention and an non-alkali glass cloth tape, is not less than 35 kV/mm, and the electrical endurance of the nano composite major insulator is not less than 1000 hours under the field strength of 10 kV/mm.

The invention relates to a novel niobate-base glass ceramic energy-storing material and a preparation method and application thereof. The chemical composition of the material is [(Ba<1-x>Sr<x>) <2>NaNb<5>O<15>] <0.6>-[SiO<2>] <0.4>, wherein 0<=x<=1. With BaCO3, SrCO3, NaCO3, Nb2O5 and SiO2 powder being raw materials, the mass of each component is weighed according to the designed chemical composition, the components are subjected to ball milling and even mixing and then added into a crucible to be molten at high temperature, and high-temperature melt is rapidly poured into a preheated copper mold for stress removal and then cut into slices with the thickness of 1.0 mm; the glass slices are placed into an annealing furnace to be subjected to controlled crystallization, and through controlling ingredients of the glass raw materials and optimizing a crystallization technology, the prepared niobate glass ceramic has high energy-storing density and reliability. Compared with the prior art, the method is simple, and through testing of experiments, the prepared glass ceramic material has high energy-storing density and charging and discharging efficiency and is expected to be used as a novel energy-storing capacitor material.

The invention discloses a stimulated experiment system for gas detonation by human body electrostatic discharge, comprising a mixed gas cavity and an ignition device positioned in the mixed gas cavity, wherein the ignition device is controlled by a human body ESD (Electro-Static Discharge) model and carries out ignition; the mixed gas cavity is communicated with a gas tank through an electromagnetic valve and is connected with an oxygen concentration sensor, a gas concentration sensor and a temperature sensor, the human body ESD model, the ignition device, the oxygen concentration sensor, the gas concentration sensor and the temperature sensor are all connected with a computer control system, and the computer control system is connected with a display device. The system of the invention excites gas in the mixed gas cavity to carry out detonation through the human body ESD model and accurately provides values of gas concentration and oxygen concentration upon gas detonation through the infrared gas concentration sensor, an infrared analyzer, the oxygen concentration sensor and the like, thus both the technical support for human body electro-static safe protection in coal mine environment and the foundation for manufacturing electrostatic preventing working uniform of miner are offered.

The invention relates to a KNN-based (sodium potassium niobate-based) energy storage microcrystalline glass material with ultralow dielectric loss and a preparation method. The microcrystalline glass material is prepared from a glass phase and a crystal phase through mixing, fusing, cooling and molding, annealing, carrying out crystallization heat treatment, wherein according to mol percent, the glass phase accounts for 20 percent to 50 percent and the balance is the crystal phase; the crystal phase is composed of K2CO3, Na2CO3, Nb2O5 and BaCO3 at a mol ratio of (3-x) to (3-x) to 6 to 2x and x is more than 0 and less than or equal to 2.5. The KNN-based energy storage microcrystalline glass material prepared by the preparation method has extremely low dielectric loss; BaO is introduced, has the effect of adjusting the composition of the crystal phase of a sodium potassium niobate system and also has a certain promotion effect on a devitrification process and devitrification is accelerated by rare-earth metal ions; the BaO can also generate a pinning effect, and adverse impacts, caused by interface polarization, on breakdown and worsening are weakened; finally, the microcrystalline glass material with a high dielectric constant is obtained.

The invention discloses a samarium-doped bismuth ferrite-barium titanate ceramic film as well as a preparation method and application thereof, and belongs to the technical field of dielectric materials. The chemical general formula of the film is x (Bi1-yScy) FeO3-(1-x) (Ba1-yScy) TiO3, wherein x and y are mole fractions, x is more than 0 and less than 1, and y is more than 0 and less than 1. The preparation method comprises the following steps of: mixing Bi2O3, Fe2O3, BaCO3, TiO2 and Sm2O3 according to a selected stoichiometric ratio to obtain raw material powder; pre-sintering the raw material powder to obtain a ceramic blank; carrying out buried sintering to obtain a ceramic target material; and bombarding the target material by using pulse laser, and carrying out annealing treatment to obtain the ceramic film. Experiments prove that the breakdown field strength of the film can reach 4-5.3 MV/cm, the energy storage density can reach 152 J/cm < 3 >, and the energy storage efficiency is about 78%; and the film is a novel dielectric material which has high breakdown field strength and high energy storage density and is environment-friendly.

The invention relates to a dielectric composite material and a preparation method thereof. The preparation method is characterized by comprising the following steps: carrying out hydroxylating treatment on the surfaces of barium titanate particles, then adding fluorine-containing monomers to initiate polymerization, and obtaining modified barium titanate with a core-shell structure; then using themodified barium titanate and a vinylidene fluoride-hexafluoropropylene copolymer to prepare and obtain an electrostatic spinning solvent, and then utilizing an electrostatic spinning process to obtain the dielectric composite material. The dielectric composite material and the preparation method have the beneficial effects that the barium titanate particles have a high dielectric constant, the vinylidene fluoride-hexafluoropropylene copolymer has a good breakdown property; by introduction of the fluorine-containing monomers, the monomer molecular chains have a certain quantity of fluorine atoms and are similar to a matrix polymer PVDF-HFP (Polyvinylidene Fluoride-Hexafluoropropylene) respectively, and the surfaces of the particles are coated with the monomers, so that the effect of mild transition is achieved, the compatibility between the particles and the matrix can be improved, further the particles have good dispersity, and the dielectric composite material has a high dielectric constant, high breakdown field strength and low dielectric loss.

The invention relates to a bismuth barium sodium niobate-based glass ceramic material with high energy storage density, and a preparation method and application thereof. The chemical components of theglass ceramic material accord with a chemical general formula of 21.6BaCO3-2.4Bi2O3-6Na2CO3-30Nb2O5-40SiO2. The preparation method comprises the following steps: taking BaCO3, Bi2O3, Na2CO3, Nb2O5 and SiO2 as raw materials to carry out uniform mixing, then carrying out drying, carrying out melting at a high temperature to obtain a glass melt; quickly pouring the high-temperature melt into a preheated mould, removing residual stress in the glass body through annealing treatment, and then cutting the glass block body into glass sheets with a same size and thickness; and carrying out controlledcrystallization on the glass sheets to obtain the glass ceramic energy storage material. Compared with the prior art, the glass ceramic energy storage material prepared by the method has the advantages of high dielectric constant (up to 118), high breakdown field strength (up to 1878.75 kV/cm), high energy storage density (up to 18.4 J/cm<3>), low loss (low to 0.025), good temperature stability and the like.

The invention provides a longitudinal tensile insulating dielectric electrical property measuring device and a measuring method thereof. The longitudinal tensile insulating dielectric electrical property measuring device is characterized by comprising a high voltage power supply, a support frame, a fixing seat disposed on the support frame, a limiting plate matched with the fixing seat and disposed on the lower portion of the fixing seat, a rotating shaft respectively connected with the supporting frame and the limiting plate and located below the limiting plate, an upper electrode member anda lower electrode member sequentially connected with the rotating shaft, a driving assembly for pulling the lower electrode member and a hollow sealing cavity covering the upper electrode member and the lower electrode member. The device has the advantages of achieving the measurement of breakdown field strengths of an insulating dielectric original sample and the sample after stretched in the directions of an upper electrode and a lower electrode, breaking through the limitation that the tested insulating dielectric sample can only be transversely stretched, and achieving the simulated measurement of the insulating dielectric sample under tensile and pressure states.

The invention provides a high-temperature energy storage hybrid polyetherimide dielectric film and a preparation method and application thereof, and belongs to the technical field of polymer capacitor films, and the preparation method comprises the following steps: reacting a polyetherimide monomer with a hydroxyl functional group to synthesize a polyetherimide acid solution with a hydroxyl end group or a side chain; then adding water and metal alkoxide as inorganic component precursors into the polyetherimide acid solution to form uniform sol, and preparing the thin film through film coating and thermal imidization treatment. The dielectric film is prepared by a one-step synthesis method, and an inorganic phase is introduced in a hybridization process, so that molecular-level dispersion is realized, agglomeration of the inorganic phase and interfacial compatibility with an organic phase are improved, and the energy storage performance of the dielectric film at high temperature is improved. The energy storage density of the obtained hybrid dielectric material can reach 3.0-3.64 J/cm < 3 > at the temperature of 200 DEG C and the efficiency of 90%, and the energy storage density is greatly higher than that of an existing dielectric. The breakdown strength, the leakage current, the glass transition temperature and other properties are all improved, and the comprehensive dielectric property is good.

The invention relates to an alumina nanoparticle/polyimide based energy-storage medium and a preparing method thereof, and belongs to the technical field of dielectric composite materials. To solve aproblem that polyimide has low energy storage density, prepared alumina nanoparticles are fully mixed with N,N-dimethylformamide and pyromellitic dianhydride according to a certain mass/volume ratio;then the mixture is added into 4,4-diaminodiphenyl ether in several times to obtain a precursor solution; after a film is prepared from the precursor solution, gradient-temperature raising imidation is performed, and a cooling step is performed to obtain the medium. The alumina nanoparticles are added into a polyimide matrix with a low loading level to ensure that the medium has excellent mechanical properties, and the medium obtained by modification of the polyimide matrix with the alumina nanoparticles has a relatively high relative dielectric constant, breakdown field strength and energy storage density and has low dielectric loss, thus solving a technical problem that dielectric capacitors have low energy storage density.

The invention provides a bismuth ferrite-based ternary solid solution dielectric film material and a preparation method thereof and belongs to the technical field of dielectric materials. The chemicalcomponent general formula is (1-x-y)BiFeO3-xBaTiO3-ySrTiO3, wherein x and y are molar fractions, and x is greater than 0 and less than 1, y is greater than 0 and less than 1 and x+y is greater than 0and less than 1. The preparation method comprises the steps of mixing raw materials of Bi2O3, Fe2O3, BaCO3, SrCO3 and TiO2 according to a selected chemical metering ratio to obtain a raw material powder; presintering the raw material powder to obtain a ceramic blank; burying and sintering the blank to obtain a ceramic target material; finally carrying out pulsed laser deposition and annealing treatment on the ceramic target material so that the bismuth ferrite-based ternary solid solution dielectric film material can be obtained. Experiments prove that the breakdown field strength of the bismuth ferrite-based ternary solid solution dielectric film material can reach 3.0-5.3 MV/cm, the energy storage density of the bismuth ferrite-based ternary solid solution dielectric film material can reach 112 J/cm<3>, the energy storage efficiency of the bismuth ferrite-based ternary solid solution dielectric film material is about 80%; the bismuth ferrite-based ternary solid solution dielectric film material is a novel environmentally friendly lead free dielectric material with excellent properties such as higher dielectric constant, smaller dielectric loss, strong polarization, high breakdown and high energy storage density.

The invention relates to a ferroelectric polymer based dielectric film, a preparation method and use thereof. The ferroelectric polymer based dielectric film provided by the invention contains a vinylidene fluoride-hexafluoropropylene copolymer P(VDF-co-HFP) and an inorganic matter AlOOH, wherein the volume percentage ratio of the two is (100-x)%P(VDF-co-HFP)-x%AlOOH, and x is greater than 0 and smaller than or equal to 10. The ferroelectric polymer based dielectric film provided by the invention has the advantages of high breakdown field strength, high energy storage density and high energy storage efficiency, no lead, environmental protection, and excellent energy storage performance, and is suitable for the high-density energy storage field.

The invention relates to a titanium dioxide based giant dielectric ceramic material and a preparation method thereof. The general formula of the titanium dioxide based giant dielectric ceramic material is (A0.5Ta0.5)xTi1-xO2+y wt% B (x=0.01-0.1, y=1-10), A is selected from at least one of Ho, Tm, Gd, Lu, La, Al, Ga and In, and B is selected from at least one of SiO2, Al3O2, Bi3O2, B3O2, ZrO2, SrTiO3 and CaTiO3. The preparation method is a solid-phase sintering method, the method is simple, the repeatability is good, the yield is high, the frequency stability of the obtained giant dielectric ceramic material within the range of 20 Hz-5 MHz is good, the dielectric constant ranges from 103 to 105, and the breakdown field strength reaches up to 322-1985 V/cm. The method has practical application value in various electronic devices such as capacitors, dynamic memories and the like.

The invention discloses a preparation method of a polymer based dielectric material and relates to the technical field of dielectric materials. The preparation method comprises the steps that ceramicparticles loaded with Ag serve as filler, polyvinylidene fluoride serves as a polymer base, the ceramic particles are subjected to surface modification through a method combining physical ball millingand chemical surface active agents, then the modified ceramic particles are prepared into composite filter by being loaded with metal Ag through an ultrasound-assisted magnetron sputtering method, and finally the polyvinylidene fluoride and the composite filler are subjected to multi-layer co-extrusion alternately. The prepared polymer based dielectric material has high breakdown field strength,high energy density, high dielectric constant and low dielectric loss, and the preparation method is low in energy consumption, environmentally friendly and free of pollution.

The invention relates to a niobium-silicon-based glass energy storage material with the high energy storage density and preparation and application thereof. Batching is conducted according to the mole ratio 25.6:6.4:32:36 of BaO to R(2)O to Nb2O5 to SiO2, wherein R is alkali metal or alkaline-earth metal; BaCO3, R2CO3, Nb2O5 and SiO2 are weighed, ball-milled and mixed to be uniform, high-temperature melting is conducted, and a high-temperature melt is obtained; after being clarified for a period time at constant temperature, the high-temperature melt is poured into a preheated metal mold, quenching molding and stress relief annealing are conducted, and then the niobium-silicon-based glass energy storage material with the high energy storage density is obtained; the obtained glass is cut into sheets with the thickness of 0.9-1.2 mm, grinding and polishing are conducted, and the obtained sheets can be applied to an energy storage capacitor material. Compared with the prior art, the preparation technology is simple, the complex aftertreatment step is not needed, the prepared glass energy storage material has the high dielectric constant of 17-23, the average breakdown-resistant field strength is 2,600-3,420 kV/cm, the energy storage density of the material is 6.7-11.1 J/cm<3>, and the material can be applied to the energy storage capacitor material.