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 belongs to the field of a compound medium and particularly relates to a nanofiber / PVDF (polyvinylidene fluoride) compound medium with a sandwich structure and a preparation method of the nanofiber / PVDF compound medium. Upper and lower layers of the sandwich structure of the compound medium are PVDF films, a middle layer is a CFO@BZT-BCT NFs / PVDF compound medium film, and the three layers of structure media are combined through hot pressing, wherein the PVDF films are prepared with a solution tape casting method through quenching treatment, and the CFO@BZT-BCT NFs / PVDF compound medium film is prepared through steps as follows: crystalized BZT-BCT NFs is prepared from a BZT-BCT spinning precursor through electrostatic spinning and high-temperature calcination, CFO is introduced, CFO@BZT-BCT NFs is prepared and subjected to surface modification with dopamine hydrochloride, finally, CFO@BZT-BCT NFs is mixed with PVDF, suspension turbid colloid is prepared and subjected to solution tape casting and quenching treatment, and the nanofiber / PVDF compound medium is prepared. The technical problems of low energy density and high dielectric loss of an inorganic filling phase / polymer based compound medium are solved.

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 relates to a ferroelectric glass-ceramic dielectric material and a preparation method thereof, belonging to the field of functional ceramics material. The preparation method comprises: BaCO3, TiO2, SiO2 and Al2O3 are taken as starting materials which are mixed together according to the proportion of aBaCO3-b TiO2-c SiO2-d Al2O3, and then dried after being grinded and mixed by ball milling; then the mixture is kept at the high temperature of 1400-1650 DEG C for 2-6h to be melt; after quick cooling, high density homogeneous glass can be obtained, controlled crystallization is carried out at certain temperature, and the ferroelectric glass-ceramic dielectric can be obtained. The dielectric constant of the ferroelectric glass-ceramic dielectric prepared by the method is adjustable within the range of 100-400, and the DC breakdown field strength reaches up to 54kV / mm. The invention can be used for the fabrication of a pulse capacitor and a DC ultra high voltage capacitor.

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 high energy storage density strontium potassium niobate based glass ceramic energy storage material and preparation and application thereof. After burdening materials according to a formula, the strontium potassium niobate based glass ceramic adopts a high-temperature fusion-rapid cooling technology to prepare the transparent niobate glass, and then the high energy storage density strontium potassium niobate based glass ceramic energy storage material is prepared through a microwave crystallization method. Compared with the existing conventional crystallization technology, the crystallization technology has the advantages of being shorter in crystallization time, more uniform in microstructure, higher in breakdown resistant electric field, and larger in energy storage density, and can be used as high energy storage capacitor and pulse technology materials.

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 discloses a preparation method of a dielectric material for a high energy storage capacitor, the invention relates to the technical field of dielectric materials, the preparation methoduses polyaniline coated with inorganic nanoparticles as a filler, polyvinylidene fluoride as polymer matrix, metal Ni as the load. Firstly, the surface of inorganic nanoparticles is modified by physical ball milling and chemical surfactant, a supercritical fluid reaction is adopted to coat polyaniline on the surface of the inorganic nanoparticles, so that a composite fill is prepared, the composite fill and the polyvinylidene fluoride are spun into a fibrous membrane by melt electrospinning, at last, the metal Ni load and the polyvinylidene fluoride are composited on the fiber membrane by magnetron sputter, the load of the metal Ni not only helps to fill the high porosity of the electrospun fiber film, but also helps to maintain high breakdown field strength, high energy storage density, high dielectric constant and low dielectric loss of the dielectric material, and the composite dielectric material has high energy storage performance.

The invention relates to a sodium bismuth titanate-based ferroelectric ceramic as well as a preparation method and the application thereof. A general chemical formula of the sodium bismuth titanate-based ferroelectric ceramic is (1-x)[0.9(0.94Na0.5Bi0.5TiO3-0.06BaTiO3)-0.1NaNbO3]-xZn, wherein x in the formula is greater than or equal to 0 and less than or equal to 0.01. The preparation method comprises the following steps: firstly, preparing all raw material components according to the stoichiometric ratio, then uniformly mixing all the raw material components and carrying out pre-sintering and grinding in sequence to obtain a ground powder body; secondly, carrying out granulating to obtain a granulated powder body; thirdly, carrying out dry pressing and cold isostatic pressing to obtain a densified ceramic green body, carrying out adhesive removal on the densified ceramic green body, and then sintering to obtain the sodium bismuth titanate-based ferroelectric ceramic. According to the preparation method disclosed by the invention, by doping zinc in the sodium bismuth titanate-based ferroelectric ceramic, the breakdown strength and a saturation polarization value of the sodium bismuth titanate-based ferroelectric ceramic are improved, the energy storage density and the stability are improved, leakage current is reduced, growth orientation of crystals is benefited as well as development and application of high-power and high-capacity storage capacitors are facilitated.

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 discloses a glass ceramic dielectric with high breakdown strength suitable for usage in high voltage direct current environment and a preparation method thereof, and belongs to the technical field of glass ceramic dielectric. The glass ceramic dielectric comprises a composition of xPbO-yBaO-zSrO-aNb2O5-bNa2O-cSiO2-dR, and x, y, z, a, b, c and d satisfy the relations of: 0<=x<=17.1, 0<=y<=17.5, 0<=z<=14.3, 10.7<=a<=34, 11<=b<=25.4, 28<=c<=47, and 0<=d<=4.5; R represents an auxiliary component, which is at least one selected from MnO2, MgO, CaO and ZnO; and x, y, z, a, b, c and d represent molar ratios. The glass ceramic dielectric provided by the invention has advantages of high breakdown strength, high dielectric constant and good dielectric constant temperature stability, and realizes no pore and direct current breakdown strength higher than 50kV / mm.

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 relates to a laminated-structure ferroelectric polymer-base dielectric film as well as a preparation method and application of the dielectric film. The film at least comprises two firstdielectric layers and a second dielectric layer located between the two first dielectric layers, wherein the first dielectric layers contain a vinylidene fluoride-hexafluoropropylene copolymer P(VDF-co-HFP) and an inorganic substance AlOOH, the volume percentage ratio of the copolymer and the inorganic substance is (100-x)% of P(VDF-co-HFP)-x% of AlOOH, wherein x is more than 0 and less than or equal to 10; and the second dielectric layer contains vinylidene fluoride-hexafluoropropylene copolymer P(VDF-co-HFP). The laminated-structure ferroelectric polymer-base dielectric film has high breakdown field strength, energy storage density and energy storage efficiency, is free from lead and environmentally friendly, has excellent energy storage performance and is suitable for the high-density energy storage field.

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 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 strontium barium niobate-based glass ceramic energy storage material and a preparation method thereof. The strontium barium niobate-based glass ceramic energy storage material is prepared from BaCO3, SrCO3, Nb2O5, SiO2, Al2O3 and B2O3 in a molar ratio of 20:20:20:(30-35):5:(0-5). The preparation method of the strontium barium niobate-based glass ceramic energy storage material comprises the following steps: carrying out ball milling and mixing, drying, then melting at high temperature, rapidly pouring high-temperature melt into a copper mould to be moulded, then carrying out stress relief annealing, cutting into glass slices with the thickness of 1.5mm, and finally carrying out controlled crystallization, so that the strontium barium niobate-based glass ceramic energy storage material is obtained. Compared with similar materials, the strontium barium niobate-based glass ceramic energy storage material has excellent machining property and can be processed into slices with the thickness below 150Mum through mechanical polishing, thereby being convenient for follow-up processing of small devices; meanwhile, the strontium barium niobate-based glass ceramic energy storage material has excellent dielectric property and resistance to breakdown field strength, and energy storage density of the strontium barium niobate-based glass ceramic energy storage material can reach 7.4J / cm<3>.

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 discloses an industrial-frequency alternating-current anodic oxidation method of an anode aluminum foil for an aluminum electrolytic capacitor and belongs to the technical field of the aluminum electrolytic capacitor. The industrial-frequency alternating-current anodic oxidation method comprises the following steps: firstly respectively connecting the two poles of an industrial-frequency alternating-current power supply with respective etched aluminum foils; subsequently dipping into a formation electrolyte to perform anodic oxidation treatment, and still performing constant-voltage anodic oxidation treatment for 5min to 20min after the impressed voltage is increased to a set voltage; finally thermally treating the aluminum foils which are subjected to the anodic oxidation treatment so as to form an Al2O3 medium film on the surface of each etched aluminum foil. Compared with an etched aluminum foil prepared by means of direct-current anodic oxidation at the same withstand voltage, the etched aluminum foil prepared by the method disclosed by the invention is 1% to 5% higher in specific volume value, 1% to 3% lower in loss value, 0.004-0.008microamp.V<-1>.microfarad<-1> in leakage current parameter K value range, and 30% to 90% higher in production efficiency.

The invention discloses a lanthanum oxide doped and modified potassium sodium niobate-based transparent ceramic and a preparation method thereof. The preparation method comprises the following steps:proportioning according to a chemical formula of 0.825(K0. 5Na0. 5)NbO3-0.175Sr1-3x / 2Lax(Sc0. 5Nb0. 5) O3, wherein x is more than or equal to 0 and less than or equal to 0.03, performing ball millingand drying to obtain raw material powder, pressing the obtained raw material powder into sheets, and sintering at 1200-1300 DEG C to obtain the lanthanum oxide doped potassium sodium niobate-based transparent ceramic. The preparation method is simple, good in repeatability and high in yield. By doping rare earth La, the defect of performance of pure potassium-sodium niobate-based ceramic is overcome, the transmittance of the prepared lanthanum oxide-doped potassium-sodium niobate-based ceramic in a visible light region can reach 65% at most, meanwhile, the ceramic has excellent energy storagecharacteristics, the energy storage density is 2.2518 J / cm<3>, and the energy storage efficiency is 81.9%.

The invention discloses a medium-voltage ethylene propylene rubber insulating material and a preparation method thereof. The medium-voltage ethylene propylene rubber insulating material comprises the following components in percentage by weight: 15-30 percent of ethylene-propylene-diene rubber, 9-20 percent of ethylene-propylene rubber, 4-10 percent of linear low-density polyethylene, 4-7 percentof zinc oxide, 0.1-0.4 percent of stearic acid, 5-35 percent of superfine talc powder, 4-7 percent of paraffin hydrocarbon oil, 0.5-3 percent of paraffin, 10-30 percent of calcining clay, 0.1-0.9 percent of surface active agent gamma-aminopropyltriethoxysilane, 0.4-1.8 percent of antiager 4,4'di(alpha,alpha dimethylbenzyl)diphenylamine, 0.5-1.5 percent of vulcanizer dicumyl peroxide and 0.3-1.4 percent of vulcanizing agent triallyl cyanurate. By synthesizing the performance of various materials and learning from strengths to offset their weaknesses, the aims of reducing the cost and improvingthe electric performance are achieved. Tests prove that the medium-voltage ethylene propylene rubber insulating material disclosed by the invention has the volume resistivity of 1014 ohm.m and the breaking-down field strength of larger than 30KV / mm and has the advantages of excellent electric performance, higher thermal ageing performance and physical and mechanical performance, simple preparation process and strong operability.

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.