173results about How to "High breakdown field strength" patented technology

The invention discloses a high-flexible polymer matrix composite membrane with high energy density and a preparation method thereof. The composite membrane is composed of a polymer matrix and core-shell structured nano-fibre dispersed in the polymer matrix; the core layer of the core-shell structured nano-fibre is ceramic fibre; the shell layer is an organic matter coated layer, wherein the mass percentage of the polymer matrix is 50-95%; and the mass percentage of the core-shell structured nano-fibre is 5-50%. The polymer matrix and the core-shell structured nano-fibre are composited into the membrane by adopting a solution blending and tape casting method or a bidirectional membrane pulling method, so that a flexible polymer matrix composite material having the advantages of being good in dielectric property, high in breakdown field strength and high in energy density is obtained. The dielectric constant of the composite material can be modulated to 10-40 by adjusting the content of nano ceramic fibre; simultaneously, the dielectric loss Tan delta is kept to be less than 5%, the breakdown field strength is more than 210 kV/mm, and the energy density is 2-6 kJ/L; and the composite material is a material which can be used for capacitors and high power static energy storage.

The invention discloses a laminated-structure polymer-based dielectric energy-storage composite material and a preparation method thereof. The composite material is a laminated thin film having at least three thin film layer structures. The laminated thin film is formed by a composite membrane, composed of nanometer fibers and a polymer, and a composite membrane, composed of nanometer particles and a polymer, in an alternately laminated manner. According to the invention, a tape casting method is employed for manufacturing a single-layer composite thin film and then a laminated hot-pressing method is employed for manufacturing the laminated composite material, or a multistage tape casting method is employed for flowing out multiple thin film layers successively to obtain a laminated structure. An experimental result proves that the laminated composite material has a relative high dielectric constant, a relative low dielectric loss, relative high breakdown field intensity and a relative high energy-storage density. The laminated composite material is expected for being applied in an embedded capacitor, a static accumulator, a large-power capacitor and the like.

The invention discloses a bismuth-based lead-free high energy storage density ceramic material and a preparation method thereof, the material and the preparation method relate to the technical field of electronic ceramics and components, and are used in related fields of energy storage capacitor application. The chemical composition of the material conforms to the general formula: (1-x)Bi0.5Na0.5TiO3+x SrTiO3+ywt%Nb2O5, which is synthesized by traditional ceramic preparation process. Through the addition of Nb, the grain size of ceramics is refined, and the breakdown field strength is increased. The ceramic components can obtain Wrec-1.8J/cm3 energy storage density under a direct current field of E = 13kV/mm, and the energy efficiency eta can reach 80 %; and meanwhile, the material has good temperature stability of energy storage performance.

An optical-waveguide grating modulator is compatible with high-frequency electrical modulation signals of limited bandwidth. The modulator comprises an optical grating formed in an optical waveguide constructed from electro-optic (EO) material and an electrode that is an RF waveguide or RF transmission line that conducts a traveling-wave electromagnetic (EM) field and that contains a portion of the optical-grating waveguide with a continuous grating. The RF input modulation signal is coupled into an RF EM field that propagates through the RF waveguide or transmission line in a direction that is parallel to the direction the light propagates in the optical-grating waveguide and that EM field overlaps the optical-grating waveguide. The light travels along the optical-grating waveguide preferably at the same velocity as the RF EM field travels along the RF waveguide or transmission line.

The invention relates to a PZT-base anti-ferroelectric material based on a rolling membrane process and a preparation method of the PZT-base anti-ferroelectric material. According to the material, a perovskite structured PZT system is taken as a matrix, La and Sn are utilized for partially replacing Pb and Zr to enter the matrix, and chemical components meet a chemical general formula (Pb[1-a]La2a/3)(Zr1-x-ySnxTiy)O3, wherein a is more than 0 and less than or equal to 0.06, x is more than 0 and less than 1.0, and y is more than 0 and less than 1.0. The preparation method mainly comprises the steps of preparing powder and a binder, carrying out burdening, mixing, rough rolling, finish rolling and film cutting, finally carrying out rubber discharging and sintering, and plating or sputtering different electrodes or laminates according to the requirements. Compared with the prior art, the anti-ferroelectric material has the advantages that the breakdown field strength is very high (more than or equal to 200 kV/cm), the energy storage density is very high (2J/cm<3>-4.2J/cm<3>), the preparation process is simple, the operation is simple and convenient, and the cost is relatively low; and the anti-ferroelectric material is suitable for industrial production.

The invention provides a polyimide high-temperature dielectric composite film and a preparation method thereof. The composite film is formed by blending at least one of hexagonal boron nitride nanosheet and molybdenum disulfide nanosheet as well as polyimide. The mass fraction of the hexagonal boron nitride nanosheet is 6% to 12%, and the mass fraction of the molybdenum disulfide nanosheet is 1% to 2%. The introduction of a nanosheet filler not only improves the thermal properties of a polyimide film, but also improves the high temperature dielectric properties that a conventional PI film hasnot been involved. The composite film has the advantages of low dielectric loss, high breakdown strength, energy storage density and energy storage efficiency at normal temperature, and keeps low conductance loss and high breakdown field strength and energy storage density at the temperature of 150 DEG C.

The invention discloses an NBT/PVDF three-layer structured composite material for energy storage and a preparation method of the NBT/PVDF three-layer structured composite material for the energy storage. NBT particle powder is prepared through a ball-milling method; PVDF is divided into three parts which are respectively dissolved in a solvent to obtain three PVDF solutions; the NBT particle powder is divided into two parts and respectively added to two PVDF solutions to obtain two NBT/PVDF stock solutions; the NBT/PVDF stock solutions, the PVDF solutions and the NBT/PVDF stock solutions are laminated and subjected to tape casting on a glass substrate sequentially by using a multi-layer tape casting process. A middle layer of the composite material is a pure PVDF polymer, and the two layers of the upper and lower layers are NBT/PVDF composite layers, dielectric ceramic particles are added in an upper-lower two-layer structure, the polarization intensity and energy storage density are used, and the middle layer uses the pure PVDF polymer to obtain high breakdown field strength.

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 relates to a preparation method of a micro/nano composite fiber electrical insulation paper, and belongs to the technical field of electrical insulation paper. The preparation method comprises the following steps: individually soaking a dry pulp board of softwood pulp and a dry pulp board of other micro fiber pulp in deionized water for 12 hours, after soaking, tearing the pulp boards into pieces with a size of 25 mm*25 mm; then decomposing and beating the processed softwood pulp board and other micro fiber pulp board by a beating machine; carrying out an ultrasonic dispersion treatment, mixing a proper amount of softwood pulp, other micro fibers, and nano fibers, and processing the mixture for 5 to 20 minutes by a stirring device. A mixing beating mode can also be adopted. Namely, preprocessed softwood pulp board and other micro fiber pulp board are directly mixed according to a certain ratio, then the mixture is decomposed and beaten by a beating machine, and the Schopper-Riegler beating degree is controlled in a range of 10 to 60 degrees SR. The process is simple, the operation is easy, and the tensile strength and breakdown field strength of prepared electrical insulation paper are both improved effectively.

The invention relates to an antiferroelectric ceramic material with excellent charging and discharging performances and a preparation method of the antiferroelectric ceramic material. The chemical general formula of the antiferroelectric ceramic material is (Pb0.97-xBaxLa0.02)(ZrySn1-y-zTiz)O3, the preparation method comprises the following steps: mixing a lead source, a barium source, a lanthanumsource, a zirconium source, a tin source and a titanium source, sequentially carrying out ball milling, drying and calcining, and sequentially carrying out secondary ball milling, drying, mixing witha polyvinyl alcohol solution, granulating, compression molding, glue discharge and sintering to obtain the antiferroelectric ceramic material. Compared with the prior art, the effective energy storage density of the prepared antiferroelectric ceramic material can reach 12.8 J/cm<3>, the energy storage efficiency can reach 84.2%, the current density can reach 1815 A/cm<2>, the discharge period canreach 51.6 ns, the power density can reach 327 MW/cm<3>, and very excellent charge and discharge performance is shown.

The invention provides a preparation method of a dielectric substance with a high energy storage density, and relates to the technical field of film material production. The method comprises the following steps of: ultrasonic mixing dispersion, mixed centrifugal washing, drying and calcining, mixed centrifugal washing, dispersing and mixing, strickling, drying and heat treatment, and quenching anddrying. According to the invention, SrTiO3 is used as a filler of the dielectric substance, is coated and modified with SiO2 and dopamine in order to effectively improve the energy storage density, the energy storage efficiency and the breakdown field strength of the dielectric substance, the highest energy storage performance of the prepared dielectric substance under the electric field strengthof 350 MV/m reaches 11.42J/cm3, and the highest energy storage efficiency reaches 55.04%.

The invention provides a barium strontium titanate-based ceramic material as well as a preparation method and application thereof, and belongs to the technical field of energy storage ceramic materials. The chemical composition of the barium strontium titanate-based ceramic material provided by the invention is (1-x) Ba < 0.8 > Sr < 0.2 > TiO < 3-x > Bi (Mg < 2 >/3Nb < 1/3 >) O < 3 >, and x is greater than or equal to 0.08 and less than or equal to 0.16. The barium strontium titanate-based ceramic material provided by the invention has high energy storage density and energy storage efficiency.Results show that the barium strontium titanate-based ceramic material provided by the invention has high dielectric relaxation and breakdown resistance, and can obtain a slender hysteresis loop; under an external electric field of 250 kV/cm, the effective energy storage density of the barium strontium titanate-based ceramic material is 2.028 J/cm < 3 >, and the energy storage efficiency reaches96.8%.

The invention discloses a crosslinking type polyether sulphone base dielectric composite material and a preparation method and application thereof. The method adopts polyether sulphone with the good thermal and mechanical properties and active functional groups (allyl lateral groups) as a base material of a polymer, meanwhile, inorganic nano ceramic particles are adopted as inorganic nanofiller, organic functionalization modification is performed on the surface of the nanofiller, benzocyclobutene is introduced, inorganic nano ceramic particles with reactable functional groups and core shell structures are formed and adopted as crosslinking points to be subjected to a crosslinking reaction with the polyether sulphone polymer with the active functional groups, a three-dimensional network structure is formed, and the crosslinking type polyether sulphone base dielectric composite material with good heat resistance and flexibility and high energy storage density is prepared. The prepared polyether sulphone base dielectric composite film has a high dielectric constant and the wide temperature application range, meanwhile, the breakdown field strength is obviously improved, and thereforethe high energy storage density under high temperature is obtained.

The invention relates to a lanthanum oxide doped strontium-barium niobate based glass ceramic energy storage material and a preparation method thereof. The preparation method includes: blending according to a molar ratio of 20BaCO3-20SrCO3-20Nb2O5-33.5SiO2-5Al2O3-1.5B2O3-xLa2O3; after barreling and mixing, drying, and melting at high temperature; quickly pouring high-temperature melt into a copper die for forming; destressing and annealing at certain temperature, cutting into glass sheets, and performing controlled crystallization to obtain the lanthanum oxide doped strontium-barium niobate based glass ceramic energy storage material. Compared with similar materials, the glass ceramic energy storage material has excellent machining performance, and can be mechanically ground and processed into sheets with thickness lower than 80 um, and convenience is brought to subsequent machining of small devices; the glass ceramic energy storage material has excellent dielectric performance and breakdown field strength resistance.

The invention discloses a BCT/BZT-system lead-free monocrystal epitaxial multilayer energy storage film and a preparation method thereof. The preparation method has the advantages that the radio frequency magnetron sputtering technology is adopted, a BCT/BZT multilayer film is obtained on a substrate through plasma bombardment of target materials, films with different periods but same thicknessesare prepared through regulation of the sputtering time of the two target materials, the obtained films can have epitaxial multilayer heterostructures, part of the current paths can be stopped at the interfaces, and breakdown is effectively suppressed; as the interfaces increase, the hindrance effect of internal current branches on materials is enhanced, so that the energy storage film prepared bythe method has extremely high energy efficiency while the huge energy storage density is achieved; the energy efficiency of 8-cycle samples is more than 65%, most of them are more than 70%, and the efficiency of 4-cycle samples can be more than 80%.

The invention discloses a TiO2 nano-material doped double-layer polyvinylidene fluoride composite medium and a preparation method thereof. The TiO2 nano-material doped double-layer polyvinylidene fluoride composite medium is characterized by comprising an upper pressure bearing layer and a lower polarization layer, wherein the upper pressure bearing layer is obtained by filling polyvinylidene fluoride with TiO2 nano-fibers arranged perpendicular to the direction of an electric field, and the lower polarization layer is obtained by filling polyvinylidene fluoride with a TiO2 nano array arranged parallel to the direction of the electric field. The preparation method comprises the following steps: casting a TO NWs/PVDF suspension on a lower polarization layer to form an upper pressure bearing layer doped with TiO2 nanofibers arranged perpendicular to the direction of an electric field, controlling the thickness ratio of the upper pressure bearing layer to the lower polarization layer to be (0.5-5):1, heating after drying in vacuum drying oven, quickly quenching in ice-water bath, and drying in the vacuum drying oven to obtain composite medium. The composite medium of the invention has the advantages that polarization and breakdown field strength can be improved at the same time.

The invention relates to a manufacturing method of an air-cooled unit capacity hydrogenerator VPI (Vacuum Pressure Impregnating) stator coil bar. An inner shielding layer on the surface of a wire canreduce an internal local discharge probability of the wire. After the coil bar is bound with a VPI main insulation layer, a straight-line segment is bound in a half-lapping mode with a layer of low-resistance anti-corona material, then VPI of epoxy anhydride resin is carried out, after impregnation is ended, the end part is respectively bound in a half-lapping mode with medium resistance, medium-high resistance and high resistance segments, and the surface of an anti-corona segment of the end part is bound with two layers of additional insulation layers; after an anti-corona layer is processedwell, the coil bar is assembled into a hot-pressing die, pressurization is carried out, and the coil bar is placed into a baking oven to carry out heating, curing and forming; and after the main insulation layer is cured and formed, a protection layer is brushed with a high-resistance anti-corona paint and a surface coating varnish so as to obtain the finished product VPI stator coil bar. The air-cooled unit capacity hydrogenerator VPI stator coil bar has the main technical performance indexes that: (1) a breakdown voltage of the finished product coil bar is greater than or equal to 5.5UN; and (2) an electrical aging resistance experiment of the coil bar shows that the service life under a voltage of 3.0UN is greater than 40H, and the service life under a voltage of 2.0UN is greater than1,100h.

The invention discloses a high breakdown field strength and energy storage density silicon dioxide doped cadmium copper titanate giant dielectric ceramic material and a preparation method. The ceramic material is prepared from materials shown in CdCu3Ti4O12-x wt%SiO2, wherein x ranges from 1.0 to 4.0, Cd(NO3)2.4H2O, Cu(NO3)2.3H2O and Ti(C4H9O)4 serve as raw materials, glacial acetic acid serves as a chelating agent, precursor powder is prepared through a sol-gel method firstly, the precursor powder is calcined at low temperature, CdCu3Ti4O12 ceramic powder which can be mixed on the molecular level and has good uniformity and high activity is obtained, then silicon dioxide powder is added into the ceramic powder, and the silicon dioxide doped cadmium copper titanate giant dielectric ceramic material can be obtained after ball milling, prilling, tableting, glue discharging and sintering. The ceramic material is simple in preparation method, low in reaction temperature, good in repeatability, high in yield and excellent in dielectric performance. The breakdown field strength can reach up to 895-2,353 V/cm, the energy storage density can reach up to 0.712-1.77 mJ/cm<3>, and wide application prospects are achieved.

The invention provides a two-dimensional nanosheet-polymer flexible composite film and a preparation method thereof. The two-dimensional nanosheet-polymer flexible composite film is prepared from a two-dimensional nanosheet and a polymer matrix, the two-dimensional nanosheet is prepared from any one or more materials in a (Ca, Sr)2(Nb, Ta)3O10 system with a perovskite structure, and the polymer isprepared from any one or more materials of polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene, polyvinylidene fluoride-hexafluoropropylene, epoxy resin, polypropylene and polyimide; and the preparation method comprises the preparation process that a KCa2Nb3O10 material is synthesized in a high-temperature sintering mode; an HCa2Nb3O10.1.5H2O material is synthesized through a proton-exchange reaction; the HCa2Nb3O10.1.5H2O material is stripped into the two-dimensional nanosheet; and then a flexible composite film product is prepared through a tape casting method. By adding thetwo-dimensional nanosheet into the polymer matrix, a polymer matrix composite with excellent performance is obtained at the low inorganic matter additive amount, thus the good flexibility of the polymer matrix of the polymer matrix composite is retained, and the breakdown field strength of the composite film is improved.

An image sensor and a forming method thereof, the forming method comprising: providing a semiconductor substrate; Forming a MOS device on the semiconductor substrate; Forming a barrier layer coveringthe surface of the MOS device and the semiconductor substrate, wherein the barrier layer comprises a carbon film, and the SP3 bond content in the carbon film is higher than a preset content thresholdvalue; A metal interconnect lay is formed on that surface of the barrier layer. The scheme of the invention can improve the transmission speed and the service life of the image sensor.

The invention discloses a sandwich-structured high-dielectric flexible composite film and a preparation method thereof. The composite film is formed by superposing three layers of structures, whereinthe three layers of structures are as follows respectively: a first outer side layer having a positive dielectric constant, a middle layer having a negative dielectric constant and a second outer sidelayer having a positive dielectric constant; the middle layer is arranged between the first outer side layer and the second outer side layer. The composite film uses organosilicone rubber as a flexible substrate and carbon nanotubes (CNTs) as a functional filler. The sandwich-structured high-dielectric flexible composite film is prepared by an in-situ polymerization method, and the composite filmhas a relatively high dielectric constant while good flexibility is guaranteed.

The invention relates to the technical field of high polymer compound materials, in particular to a compound material with high energy density and a preparation method thereof. The compound material with high energy density is mainly obtained by mixing titanate particles of a core-shell structure with a high polymer; the titanate particles of the core-shell structure is obtained by coating silicondioxide on the surface of the titanate particles. According to the compound material with the high energy density and the preparation method thereof, the silicon dioxide serving as an insulating layer is coated on the surface of ultra-fine barium titanate particles to form the titanate of the core-shell structure, the local electric field concentration and electric charge accumulation can be effectively weakened, the formation of a leakage current passage is prevented, the dielectric loss is reduced, the voltage resistant performance of the material is wholly improved, and the homogeneous dispersion of titanate and high-interface compatibility brought by a silicon dioxide layer can improve the puncture of thin film; the titanate of the core-shell structure compounds with the high polymer,and the compound material with excellent energy storage performance can be obtained under the condition of lower filling quantity.

The invention relates to a preparation method for a lead-based anti-ferroelectric nanometer material and a lead-based anti-ferroelectric ceramic energy storage material and belongs to the technical field of electronic materials and devices. According to the preparation method, an ammonium nitrate-ammonia water buffered solution is used as a precipitator, and thus, a prepared lead-based anti-ferroelectric nanometer powder is small in particle size and even in distribution, and the particle size distribution of the lead-based anti-ferroelectric nanometer powder is shown by the following formula: D(0.5)=0.061mum, D(0.9)=0.111mum. The breakdown field strength of the block ceramic energy storage material prepared from the lead-based anti-ferroelectric nanometer powder reaches up to 145kV/cm, and the energy storage density reaches 2.52j/cm<3>. The ceramic energy storage material can be widely used for the technical field of energy storage capacitors, high-power pulsed electrical sources, high-speed trains, electric automobiles, kinetic-energy weapons and the like.