24 results about "Breakdown strength" patented technology

The invention discloses a method and a system for enhancing the interface performance of an optical fiber composite insulator. The method comprises the following steps: firstly, introducing a polar functional group on the surface of an optical fiber through plasma pretreatment and forming micro-etching; then coating a nano SiO2 transition layer on the surface of the optical fiber by adopting a sol-gel method; and finally, implanting the treated optical fiber into a composite core matrix material containing a silane coupling agent, and curing and molding. Through the synergistic effect of physical anchoring and chemical bonding, the interface bonding strength between the optical fiber and the core body is remarkably enhanced, the tensile strength of the composite material is improved from 35.096 MPa to 52.117 MPa, the bending strength of the composite material is improved from 60.124 MPa to 78.946 MPa, meanwhile, the breakdown strength is remarkably improved, the leakage current is remarkably reduced, the interface electric field distribution is effectively improved, and the service life of the composite material is prolonged. And the mechanical performance, the electrical insulation performance and the long-term operation reliability of the optical fiber composite insulator are improved.

Disclosed in the present invention are an aging performance influencing factor determination method and apparatus for a solid insulating material, a terminal device, a storage medium and an aging performance evaluation method. The aging performance influencing factor determination method comprises: on the basis of the number of aging performance influencing factors to be selected of a solid insulating material and the number of corresponding factor levels, determining an orthogonal experimental solution; acquiring the breakdown strength of the insulating material under different factor levels of each of said aging performance influencing factors, the breakdown strength being obtained by means of the orthogonal experimental solution; on the basis of the breakdown strength, calculating the significant effect value of each of said aging performance influencing factors; and comparing the significant effect value of each of said aging performance influencing factors with a preset significance level, and determining, as a selected aging performance influencing factor, an influencing factor the corresponding significant effect value of which is lower than the preset significance level. The present invention can be used to effectively reduce the number of factor determination experiments, thereby saving time and resources.

The present invention belongs to the technical field of dielectric analysis. Disclosed is a method for determining the minimum number of samples required for acquiring dielectric breakdown strength. The method comprises: using the set current number of experimental samples, and a reliability measure value and a reliability estimate value of a Weibull sub-distribution corresponding to each breakdown cause to characterize the current key quantity of each sub-distribution, in order to select a target sub-distribution; and taking into account the relationship between the current key quantity of the target sub-distribution and a reference value, and if the current key quantity is greater than the reference value, increasing the current number of experimental samples until a corresponding current key quantity is lower than the reference value, and using the current number of experimental samples as the minimum number of samples. In the method for determining the minimum number of samples provided in the present invention, variation patterns of a plurality of breakdown causes are taken into account to design the current key quantity related to the current number of experimental samples, and on the basis of the relationship between the current key quantity and a reference value, the current number of experimental samples is dynamically adjusted, thereby ultimately quickly and accurately determining the minimum number of samples.

The application discloses an electrode structure and a polarization method for an ultrathin back gate ferroelectric dielectric layer, which comprises a source electrode, a drain electrode and a gate electrode; a channel is arranged on the upper surface of the ferroelectric dielectric layer, the source electrode and the drain electrode are arranged at two ends of the channel respectively, and the gate electrode is arranged on the lower surface of the ferroelectric dielectric layer; a first polarization pulse input port is arranged between the source electrode and the gate electrode, and a second polarization pulse input port is arranged between the drain electrode and the gate electrode. The application solves the problems that the low breakdown strength is introduced due to the ultrathin thickness of the ferroelectric film, and the polarization electric field cannot be applied to the vertical channel due to the back gate structure, so that the polarization is insufficient, realizes the regulation and control of the polarization performance of the hafnium-based ultrathin ferroelectric film serving as a back gate dielectric layer in a field effect transistor, further improves the reliability and stability of the residual polarization field, and has important significance for constructing a floating gate structure of a field effect device and inhibiting device leakage and power consumption.

The application discloses a dielectric breakdown field strength and temperature dependence simulation method and system, and the simulation method comprises the following steps: establishing a criterion for polymer damage caused by molecular chain slip under the action of heat based on a free volume theory; establishing a breakdown criterion for polymer damage caused by molecular chain slip under the joint action of an electric field and a thermal field; quantifying the serpentine movement of a molecular chain under the action of a strong force; establishing an approximate analytical expression of polymer breakdown strength; and fitting the experimental results of sample breakdown field strength change with temperature according to the analytical expression by using a Curve fitting tool of Matlab. The breakdown model established from the perspective of molecular chain displacement can well explain the change relationship between the polymer nanocomposite dielectric breakdown field strength and temperature, and provides theoretical guidance for the preparation of high-temperature dielectric materials.

The invention belongs to the technical field of dielectric materials, and particularly relates to a composite dielectric film and a preparation method and application thereof. Through a nano-particle coating technology and an optimized formula, the breakdown voltage and the breakdown strength of the composite film are improved while the high dielectric constant and the low loss of the film are ensured; the interface bonding between the BT particles and the PP matrix is good, the uniform distribution of the nano filler is ensured, the performance stability of the film is improved, and the film has excellent stability and durability especially in a high electric field environment. The preparation process is simplified, a one-step film forming process is adopted, traditional multi-step operation is avoided, the production efficiency is improved, and the production cost is reduced; the technological process is simple, the controllability is high, the application requirements of electronic devices on miniaturization, high energy efficiency and high performance are met, and industrial popularization of high-performance dielectric materials is promoted; the thin film capacitor is compatible with various applications, and is suitable for high-performance thin film capacitor requirements of filtering, power electronics, new energy equipment and the like.

The invention provides a gas-phase fluorination regulation and control method for synchronously improving internal and external insulating properties of an extra-high-voltage direct-current wall bushing, and relates to the technical field of power transmission and transformation equipment of a power system. According to the method, the electric-thermal-mechanical coupled multi-physical field simulation model is established, iteration with experimental data is carried out, the fluorination reaction rate of the surface of the epoxy resin core rod and the fluorination layer thickness of the silicone rubber outer insulation layer are synchronously regulated and controlled by adopting a collaborative fluorination process, and the gas-solid interface breakdown voltage and the outer insulation surface flashover gradient of the sleeve are respectively improved by about 20% and 25%. Experiment and simulation results show that the method can effectively regulate and control gas-solid interface charge distribution, inhibit electric field distortion and improve surface flashover voltage; the direct fluorination treatment obviously enhances the breakdown strength and surface flashover tolerance of the high polymer material, obviously improves the overall insulation performance of the bushing under the extra-high voltage direct current working condition, and solves the technical problem of synchronous improvement of the internal and external insulation performance of the extra-high voltage wall bushing.

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 belongs to the technical field of ferroelectric materials, and particularly relates to a Sr0. 4Na0. 2NbO3 doped Bi0. 5Na0. 5TiO3 (BNT) based ferroelectric film and a preparation method of the Sr0. 4Na0. 2NbO3 based ferroelectric film. A modified sodium bismuth titanate Bi0. 5Na0. 5TiO3 (BNT)-based material is doped with A / B site elements, Sr0. 4Na0. 2NbO3 with a tungsten bronze structure is selected as a doping component, the chemical composition is (0.94-x) Bi0. 5Na0. 5Na0. 2NbO3, the doping amount of the Sr0. 4Na0. 2NbO3 is 0.01-0.1, the doping amount of the Sr0. 4Na0. 2NbO3 is 0.01-0.1, and 1 mol% of manganese is additionally doped on the basis of the Sr0. 4Na0. 2NbO3. The lead-free ferroelectric film is prepared by a sol-gel method. The breakdown resistance (Eb) and recoverable energy storage density (Wrec) of the sodium bismuth titanate-based lead-free ferroelectric film prepared according to the invention are remarkably improved, compared with an undoped sample, the Eb is improved by 56%, the maximum polarization intensity (Pmax) reaches 102.4 [mu] C / cm < 2 >, and the Wrec is improved from 94.11 J / cm < 3 > to 128.82 J / cm < 3 > and improved by 37%.

The application discloses a method and device for analyzing the Young's modulus of an interface region of a polymer nanocomposite dielectric, wherein the method uses a Monte Carlo method to construct a three-dimensional structure model of the polymer nanocomposite dielectric, simulates a stress and strain field and an effective Young's modulus of the polymer nanocomposite dielectric with high throughput, simulates the effective Young's modulus of the polymer nanocomposite dielectric with high throughput in combination with an effective medium theory, and inversely obtains a Young's modulus distribution characteristic of the interface region. The method establishes a correlation between the mesoscopic characteristics of the interface region and macroscopic mechanical properties, provides theoretical and method support for research and development of high-performance electrical insulating materials, and is helpful to development of dielectric capacitors with high breakdown strength and energy storage density.

The invention discloses an ordered ferroelectric composite ceramic with high energy storage density and high temperature stability. A composite ceramic matrix is a Bi0. 5Na0. 5TiO3-based lead-free relaxor ferroelectric material, a reinforcing phase is flaky Al2O3, the mass percent of the flaky Al2O3 is xwt% Al2O3, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 lt, 0 And x < = 7. Flaky Al2O3 is arranged in a ferroelectric matrix in parallel through a tape casting process, and the sequential ferroelectric composite ceramic is prepared by combining a sintering process. When the flaky Al2O3 is parallel to an electrode, an applied electric field can be effectively dispersed in the whole composite ceramic matrix, so that the phenomena of electric field concentration and electric field distortion in the matrix are weakened, the breakdown strength of the composite ceramic is improved, and the energy storage density of the composite ceramic is further improved. Meanwhile, the flaky Al2O3 can effectively hinder the transmission of charges at high temperature, reduces the high-temperature leakage current density, and is beneficial to improving the high-temperature stability of the composite ceramic.

The invention discloses a preparation method of an all-organic PF / PC composite dielectric film containing a molecular semiconductor. Belongs to the technical field of energy storage materials. The invention aims to improve the breakdown strength of the polymer medium and enhance the energy storage density of the polymer medium. According to the invention, PC particles and PF are dissolved in tetrahydrofuran to prepare a mixed solution, the PF / PC dielectric film is prepared by a method of drying after film coating, and the specific mechanism is that introduction of a molecular semiconductor PF forms a molecular trap with PC to inhibit transport of carriers, and hydrogen bonds are formed between fluorine atoms of PF and hydrogen atoms of PC to effectively inhibit migration of charge carriers, so that the performance of the PF / PC dielectric film is improved, and the performance of the PF / PC dielectric film is improved. Therefore, the insulating property of the polymer dielectric material is enhanced by inhibiting conduction, and the breakdown strength is finally improved. The invention can be widely applied to modern electronic equipment, 5G communication, electric automobiles, electromagnetic weapons and power systems.

The application provides a high-voltage ceramic capacitor and application thereof, and belongs to the technical field of capacitor materials. m Zr n Sn p Ce q Si s )O3, wherein 0.5 >= m >= 0.25, 0.25 >= n >= 0.2, 0.25 >= p >= 0.2, 0.25 >= q >= 0, 0.1 >= s >= 0, and m+n+p+q+s=1. The layer thickness of the dielectric material is controlled to be 5-15 mm, so that the breakdown strength is improved without increasing the layer thickness.

The invention discloses a high-K ceramic / polymer composite dielectric material with a gradient dielectric interface and a method. The high-K ceramic / polymer composite dielectric material comprises a polymer matrix and a core-shell structure filler dispersed in the polymer matrix, the core-shell structure filler comprises a high-dielectric-constant ceramic core and a multi-layer gradient dielectric interface shell layer coating the surface of the high-dielectric-constant ceramic core; the inner passivation layer is directly combined with the surface of the ceramic core, the middle dielectric transition layer is coated on the surface of the inner passivation layer, and the outer compatible layer is coated on the surface of the middle dielectric transition layer. The invention has the characteristics of uniform interface electric field distribution, high breakdown strength and large energy storage density.

The invention discloses a micro-rectangular weatherproof sintering connector and an active assembly thereof, the micro-rectangular weatherproof sintering connector comprises a first connector and a second connector, a first receiver is internally provided with a contact piece and a twist needle along a first path and a second path, and the twist needle is inserted into one end of the contact piece; an insulator is sintered on the outer side close to the end part of the contact piece, and sealant is coated on the outer side close to the end part of the twist needle. The array plane interconnection structure is low in production cost, convenient to disassemble, assemble and maintain, and high in connection reliability and performance stability; a glass sintered blank with a staggered structure is used as a solid insulator, so that a vertically and horizontally staggered insulating surface can be formed, the maximum field intensity generated locally can be limited, the local field intensity stress is reduced, the breakdown field intensity is reduced, and partial discharge is avoided; the integrated glass blank can reduce the voltage breakdown strength, increase the length of a creepage path along the solid surface of the glass insulator, and can segment and block the creepage path.

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 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 invention discloses a method for improving the breakdown strength and uniformity of a biaxially oriented polypropylene film by using nitrogen-oxygen mixed plasma. The method comprises the following steps: S1, selecting the biaxially oriented polypropylene film as a base film; s2, carrying out ultrasonic cleaning on the base membrane, and blow-drying for later use after cleaning; s3, the base film obtained in the step S2 is placed in a plasma reaction cavity, and plasma treatment is conducted on the surface of the base film; wherein nitrogen and oxygen mixed gas is adopted in the plasma treatment, the volume ratio of nitrogen to oxygen is (1-10): 1, the air pressure of the mixed gas is 10-100 Pa, and the plasma treatment time is 2-30 s; and S4, plating a metal electrode on the base film subjected to plasma treatment through thermal evaporation. According to the method, the surface of the biaxially oriented polypropylene film is modified for a short time through mixed gas plasmas in a specific proportion, the breakdown strength of the film is improved by about 30% on the premise that the performance of a base film body is not damaged, meanwhile, the standard deviation of the breakdown strength is remarkably reduced, and the uniformity of the film is greatly improved.

The invention discloses composite insulating oil paper as well as a preparation method and application thereof, and relates to the technical field of electrical engineering insulation. The composite insulation oil paper sequentially comprises a dielectric transition layer, a cellulose insulation paper matrix and a conductive slow release layer, the dielectric transition layer comprises BaTiO3 and TiO2 according to the mass ratio of (0.3-3): 1, and the conductive slow release layer comprises alpha-SiC. Different functional layers are introduced to the two sides of a cellulose insulation paper substrate respectively, so that the interface bonding between the insulation paper and ester insulation oil can be improved by virtue of the synergistic effect of mechanisms such as dielectric constant gradient mitigation and local electric field peak diffusion; therefore, the dielectric loss of the oil-paper insulation system is reduced while the partial discharge capacity of the oil-paper insulation system is reduced and the insulation breakdown strength is improved.

The invention provides a ceramic composition with high temperature stability and high dielectric constant and a preparation method thereof, and relates to the technical field of electronic materials, the ceramic composition takes barium titanate with high purity and uniform granularity as a main component, and is matched with various doping components including rare earth element oxide, alkaline earth metal oxide and transition metal oxide. The preparation method integrates advanced freezing ball milling, microwave-assisted pre-sintering, precise multi-stage sintering, annealing treatment and other processes. By optimizing the components and innovating the process, the dielectric constant and the temperature stability of the ceramic are remarkably improved, the dielectric loss is reduced, the resistivity and the breakdown strength are improved, and the microstructure is improved. The prepared ceramic composition can keep stable performance in a wide temperature range of-70 DEG C to 180 DEG C, meets strict requirements in the fields of high-frequency electronic devices, high-capacity capacitors, microwave communication and the like, has wide application prospects and important practical values, and is expected to promote technical progress and industrial development in related fields.

The application discloses a high-breakdown-strength battery diaphragm, a preparation method thereof and a battery. The high-breakdown-strength battery diaphragm comprises a porous microstructure, which contains a plurality of insulating core fibers and a voltage-resistant sheath layer coated on the insulating core fibers, and two or more insulating core fibers are interwoven to jointly define one or more micro-holes; the insulating breakdown strength of the high-breakdown-strength battery diaphragm is not less than 110 V / μm, and the core-sheath structure formed by coating the insulating core fibers with the voltage-resistant material maintains the overall thickness change rate of the diaphragm at a low level, so that the high insulating breakdown performance is realized at a low thickness increment.

The invention discloses a semiconductor structure and a forming method thereof. A first dielectric layer on the substrate; the dielectric buffer layer is located on the first dielectric layer, and the anti-breakdown strength of the dielectric buffer layer is larger than that of the first dielectric layer; the multiple electrode layers are sequentially stacked on the dielectric buffer layer from bottom to top; the dielectric layers are located between the adjacent electrode layers in the longitudinal direction; the second dielectric layer is located on the substrate and covers the multi-layer electrode layer. The anti-breakdown strength of the dielectric buffer layer is greater than the anti-breakdown strength of the first dielectric layer, so that the anti-breakdown voltage of a capacitor (MiM) formed by the multi-layer electrode layer and the dielectric layer is increased, the anti-breakdown capability of the capacitor is improved, the capacitor can be suitable for a high-voltage working environment, and the device performance of the semiconductor structure is further improved.

The invention discloses an epoxy resin-gridding cloth composite material optimization method and structure for a high-frequency transformer, and the method comprises the steps: preparing a plurality of groups of epoxy resin-gridding cloth composite material samples for the high-frequency transformer, and constructing a three-dimensional finite element model only containing epoxy resin solid sealing insulation based on a high-frequency transformer geometric structure; the simulation model comprises an iron core, a low-voltage winding, a high-voltage winding and an epoxy resin solid-sealed insulator. Inputting material parameters, and simulating to obtain distribution of an electric field, a temperature field and a mechanical stress field under a reference working condition; assigning each group of physical parameters to the local buffer layer model for multi-physics field coupling simulation to obtain temperature, stress and electric field distribution under different grid cloth layer number configurations, and selecting the grid cloth layer number of which the temperature rise is reduced, the maximum stress is reduced and a high-field-intensity region is located in a high-breakdown-strength material according to a simulation result to obtain the multi-physical-field coupling simulation of the local buffer layer model. The high-frequency transformer solid-sealed insulation structure is used.

The invention discloses an extremely-cold-resistant high-breakdown-strength insulating impregnant as well as a preparation method and application thereof, and belongs to the technical field of manufacturing of electronic and electrical insulating materials. The invention aims to solve the problem that the electrical performance, the kinematic viscosity and the insulating performance of the impregnant used by the existing electrical equipment in the extremely cold region cannot meet the performance requirements under the extremely cold condition, so that the electrical equipment has frequent faults. In order to improve the performance of the impregnant under the extremely cold condition, two or more substances of monobenzyl toluene, dibenzyl toluene, phenyl ethylbenzene ethane and 1, 1-diphenyl ethane are compounded, and then surface-modified nano-particle raw materials are mixed into the compounded impregnant, so that the surface-modified nano-particle impregnant is prepared. According to the present invention, the electrical performance including the breakdown voltage of the impregnant is improved, the kinematic viscosity under the extremely cold condition is ensured, such that the impregnant can well meet the application requirements under the extremely cold condition, and the advantages of simple process, low cost, environmental protection and high efficiency are provided.