53 results about "Breakdown strength" patented technology

The present application provides an entropy-regulated composite dielectric film, which comprises a polymer matrix; and fillers dispersed in the polymer matrix, wherein the fillers comprise Bi 4‑a M 1a Ti (3‑3b) M 2b O 12 , wherein M1 comprises at least one of lanthanum, neodymium, samarium and praseodymium, M2 comprises at least one of zirconium, hafnium and tin, 0 The entropy-regulated composite dielectric film has high temperature resistance, high breakdown strength, high polarization strength, high energy storage density and good stability.

The invention relates to the technical field of electrical engineering, in particular to a composite material dielectric breakdown multi-scale simulation method and device, and the method comprises the steps: calculating the electric field intensity of a grid based on a preset geometric structure of a nano composite material, and calculating the electric field intensity of the grid based on material parameters and structure parameters of the nano composite material; calculating the molecular interaction energy of the interface between the nanofiller and the matrix; calculating a target breakdown probability of the grid by utilizing the electric field intensity and molecular interaction energy, generating a target state parameter of the grid based on the target breakdown probability, determining a target breakdown strength value meeting a condition by utilizing the target state parameter, and performing Weber distribution fitting processing on the target breakdown strength value to obtain a target breakdown strength value; and determining a simulation result of the breakdown strength of the nano composite material. Therefore, the problems that most of breakdown simulation methods in the prior art are single-scale models, the interfacial effect is not fully considered, errors in the aspect of quantitative prediction of the breakdown strength are large, and the accuracy of breakdown simulation is reduced are solved.

The invention relates to the technical field of power system transformers, and discloses a converter transformer oil paper insulation electrical strength prediction method, which comprises the following steps: S01, setting the temperature of a converter transformer oil paper insulation sample, S02, applying voltage to the converter transformer oil paper insulation sample to generate breakdown, S03, collecting breakdown strength data, and S04, determining the electrical strength of the converter transformer oil paper insulation sample. S04, analyzing breakdown strength data, S05, fitting breakdown data according to a quadratic nonlinear regression equation, and S06, predicting the electrical strength of the oil paper insulation of the converter transformer, namely predicting the breakdown strength of the oil paper insulation material under different temperature and harmonic frequency conditions, and determining the electrical strength of the oil paper insulation according to the influence of the temperature and the frequency on the electrical strength of the oil paper insulation. The method can more comprehensively reflect the insulation state under the actual operation condition, and provides a theoretical basis for the evaluation of the insulation performance of the converter transformer equipment in the actual operation.

[Question] To reduce uneven wall thickness of the insulation layer or the occurrence of voids or delamination due to shrinkage, and to provide a power cable with excellent dielectric breakdown strength and a method for manufacturing the power cable. [Solution] According to the power cable 1 of the present invention, the insulation layer 13 contains a propylene resin within a specific range, and the relationship between the cooling rate X at the interface portion of the insulation layer 13 with the inner semiconductive layer 12 during manufacturing and the cooling rate Y at the center portion of the insulation layer 13 during manufacturing is set to a specific relationship. This allows not only the surface of the insulation layer 13 but also the interior of the insulation layer 13, the interface portion of the insulation layer 13 with the inner semiconductive layer 12, and the interior of the insulation layer 13 to be reliably cooled and hardened. As a result, the metal conductor 11 is prevented from deviating from the center of the power cable 1 due to its own weight, wall thickness unevenness is less likely to occur, and deformation caused by cooling shrinkage is dispersed, thereby suppressing the occurrence of voids due to shrinkage, resulting in a power cable 1 with excellent dielectric breakdown strength.

The invention relates to the field of insulation electrical strength evaluation, and particularly discloses a method for evaluating the oil paper insulation electrical strength of a converter transformer through alternating-current and direct-current voltage superposition. Comprising the following steps: step S01, collecting breakdown voltage data of an oil paper insulation sample; step S02, analyzing breakdown strength distribution of the oil paper insulation sample; step S03, analyzing breakdown characteristics of an unaged oil paper insulation sample; step S04, analyzing breakdown characteristics of a thermally aged oil paper insulation sample; s06, outputting a breakdown characteristic analysis result of the oil-paper insulation sample, and analyzing the influence of alternating-current and direct-current voltage superposition and thermal aging on the breakdown characteristic; according to the method, the breakdown performance of the oil paper insulating material under the alternating current / direct current superposed voltage and thermal aging conditions is deeply analyzed, the influence on the performance of the oil paper insulating material is obtained, and a theoretical basis is provided for optimization and reliability improvement of insulating materials in a high-voltage direct current system and a converter transformer.

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.

The invention belongs to the technical field of composite material testing, and particularly relates to a material breakdown strength testing device and method. The material breakdown strength testing device comprises a shell, an electrifying device and at least one group of stretching and fixing mechanism, a first fixing piece and a second fixing piece are arranged on two opposite sides of the shell and are used for fixing two ends of a sample, and a stretching driving piece is used for driving at least one of the first fixing piece and the second fixing piece to transversely move so as to stretch the sample; the electrifying device is used for electrifying the sample. The material breakdown strength testing method comprises the following steps: driving a stretching driving piece to stretch a sample to enable the sample to reach a preset length; and starting the electrifying device to electrify the sample until the sample is punctured, stopping electrifying the sample, and recording a voltage value when the sample is punctured. According to the material breakdown strength testing device and method in the technical scheme, the safety margin during operation of the composite material is reflected more truly, and the potential safety hazard problem in material selection or design is reduced or avoided.

Provided is: an organopolysiloxane cured film that is superior as a thin film and, in terms of flatness, has significantly superior smoothness and flatness at the film surface, in addition to generally having high dielectric breakdown strength against a load voltage; along with a usage and manufacturing method therefor. The organopolysiloxane cured film, in which an arithmetic average height (Sa) of the film surface is less than 0.50 μm, while an average thickness at the center of the film is within a range of 1 to 20 μm. It is possible to obtain such a film by a manufacturing method including a die coating step in which a slot die is used to coat a curable organopolysiloxane composition on a continuously traveling substrate supported between a pair of support rolls by means of a tension support system.

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 application provides a fiber weaving structure dielectric film for a high energy density capacitor and a preparation method, and aims at the fact that the dielectric constant and the breakdown strength of a polymer-based dielectric material are difficult to be simultaneously improved, so that the energy density cannot meet the demand of a high power density energy storage capacitor. A polyetherimide / polyvinylidene fluoride-hexafluoropropylene core-shell structure fiber with a core-shell structure is prepared through a coaxial electrospinning technology, a composite film is formed through laminated hot pressing, the weaving structure is adjusted by adjusting the core-shell fiber composition content, the fiber orientation stacking direction and the stacking layer number, the mechanical strength of the film is enhanced, carriers are captured by deep traps, the breakdown strength is significantly improved, the high dielectric constant is maintained by utilizing interface polarization, and the energy density is comprehensively improved.

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 relates to the technical field of insulation testing of high-voltage variable frequency motors, in particular to a testing structure and method for insulation breakdown or partial discharge of a variable frequency motor, and the structure comprises a hollow metal tube body which is wrapped by an insulating layer for insulation breakdown test or partial discharge test. A coaxial cylinder electrode structure for generating a radial uniform electric field is arranged in the middle of the metal tube body; the insulating layer is positioned on the surface of the coaxial cylinder electrode structure; a winding wire layer is arranged on the outer side of the coaxial cylinder electrode structure, the inner side of the winding wire layer makes contact with the coaxial cylinder electrode structure, and one end of the winding wire layer is led out to serve as an electrode to be connected with an external testing circuit. The two ends of the metal tube body serve as electrodes to be connected with an external test circuit. According to the invention, the electrical stress borne by insulation under the actual operation condition can be effectively simulated, and the comprehensive measurement of the insulation breakdown strength and the partial discharge characteristic can be realized. The structure is reasonable in design and convenient to manufacture, and has good repeatability and adaptability.

The utility model discloses an anti-breakdown magnetron antenna sealing cover, which belongs to the technical field of magnetrons and comprises a cover body, the cover body is composed of a side surrounding cylinder and a cover plate, the cover plate is arranged at one end of the side surrounding cylinder to form a cylinder body with an opening at one end, the length of the side surrounding cylinder is slightly longer than that of a metal part of a microwave output wire of a magnetron, and the length of the side surrounding cylinder is larger than that of the metal part. The side surrounding cylinder and the cover plate are both made of insulating materials, and the cover body is bonded to a microwave output wire of the magnetron through glue with good insulating performance. During specific implementation, the cover body is arranged at the output antenna of the magnetron, so that the problem that the antenna cap is easily ignited and broken down when the load mismatch reflection power is too large or the humidity near the antenna is too large is solved; through the side surrounding cylinder with a proper thickness and the cover plate with a proper thickness, the working performance of the magnetron is not influenced, the breakdown strength of the antenna to the ground can be effectively increased, and the probability of ignition breakdown is reduced or even eliminated.

The invention discloses an energy storage ceramic material and a preparation method thereof, the general formula of the energy storage ceramic material is y (zBi < 0.8-x > D < 0.2 > Gd < x > Fe < 1-uEuO < 3-1-z > G)-(1-y) I, wherein Bi < 0.8-x > D < 0.2 > Gd < x > Fe < 1-uEuO3 > is obtained by partially replacing an A-site element of BiFeO3 with at least one of a D element and a Gd element and partially replacing a B-site element of BiFeO3 with an E element; bi ions of BiFeO3 are partially replaced by Gd ions; at least one of D and E is an element capable of ensuring that the energy storage ceramic material is a solid solution; g is a general formula of a modifier capable of improving the stability of Bi < 0.8-x > D < 0.2 > Gd < x > Fe < 1-uEuO < 3 >; i is a crystal structure regulator general formula capable of transforming the energy storage ceramic material to a pseudo-cubic phase; the value range of x is less than or equal to 0.4, the value range of y is more than 0.7 and less than or equal to 0.1, the value range of z is more than or equal to 0.2 and less than 0.5, and the value range of u is more than or equal to 0 and less than or equal to 1. The obtained energy storage ceramic material has the advantages of grain refinement, effective inhibition of Bi < 3 + > volatilization, defect concentration reduction, dielectric constant peak value reduction, dielectric peak broadening, dielectric thermal stability enhancement, energy storage density increase, and breakdown strength and band gap energy increase.

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 dielectric energy storage, and particularly relates to a preparation method and application of a covalent cross-linked polyimide film. The cross-linked polyimide film is prepared from fluorine-containing polyimide and amine-functionalized inorganic nano aluminum oxide particles, so that the problem of low discharge energy density caused by small dielectric constant and low breakdown strength of a traditional polyimide film is solved, and the breakdown strength and the discharge energy density of the polyimide film are effectively improved; the application field of the polyimide composite film is expanded, and a basis is provided for chemical modification of polyimide.

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 present invention discloses a method for targeted repair of microcracks in insulating paper based on magnetic responsive microcapsules, which relates to the field of high voltage and insulation technology. The specific steps include: using ABAQUS software to establish a three-dimensional geometric model of cellulose insulating paper, and creating a model of uniformly distributed and surface-distributed magnetic responsive microcapsules; performing finite element simulation to analyze stress concentration under different distribution modes; establishing molecular models of PUF microcapsules, IPDI and water molecules, simulating the diffusion of IPDI and the reaction process with water molecules in a humid environment, and generating polyurea molecules; establishing a crack model of cellulose insulating paper, introducing the generated polyurea molecules, and simulating the filling process; performing comparative analysis before and after repair. The insulating paper repaired by the method of the present invention has significant improvements in tensile strength, fracture toughness, modulus, dielectric constant and breakdown strength. Through the targeted repair of magnetic responsive microcapsules, the overall performance and service life of the insulating paper can be effectively improved, which has important engineering application value.

The utility model relates to the technical field of breakdown voltage testing, and discloses a breakdown voltage testing device capable of adjusting pressure, which comprises a testing box body, a negative electrode metal plate is arranged at the bottom end in the testing box body, an assembling seat is arranged at the top end in the testing box body, and a cylinder is arranged in the assembling seat. And a gas adjusting valve is arranged on one side of the air cylinder, an insulating block is installed at the bottom end of the air cylinder, and a positive electrode metal plate is installed at the bottom end of the insulating block. When the breakdown voltage testing device is used for testing, if the breakdown strength and the withstand voltage time of the solid insulating material under different pressures need to be tested, the pressure of the gas supplied to the cylinder can be changed by adjusting the opening degree of the gas adjusting valve, so that the pressure of the cylinder can be adjusted; compared with the mode that a weight is placed above the solid insulating material to apply pressure, the operation mode is more convenient and faster to use.

The invention discloses a polyimide multilayer composite film with a gradient structure and a preparation method. Comprising the following steps: preparing a polyamic acid solution A, a polyamic acid solution B and a polyamic acid solution C, preparing a first low dielectric layer, preparing a first medium-high dielectric layer, preparing a high dielectric layer, preparing a second medium-high dielectric layer, preparing a second low dielectric layer, and performing high-temperature imidization treatment. The composite film with a multi-layer dielectric gradient structure is prepared through layer-by-layer gradient film coating, a breakdown path is prolonged by utilizing an interlayer interface structure, so that the breakdown strength is improved, electric field distribution is optimized and partial discharge is inhibited through dielectric constant gradient design, the problem of non-uniform electric field distribution in the film in a high-temperature and high-pressure environment is solved, and the performance of the film is improved. Interlayer cross-linked covalent bonds are obtained through the high-temperature decarboxylation reaction, the problem that interlayer interface compatibility is poor can be effectively solved, and the interface bonding force is enhanced.

The present invention discloses a preparation method of a dielectric ceramic material with high breakdown strength and high energy storage density. The specific steps are as follows: Weigh BaCO3 with a weight percentage of 40 - 50%, B2O3 with a weight percentage of 5 - 10%, SiO2 with a weight percentage of 33 - 38%, and ZnO with a weight percentage of 5 - 10%. Ball mill, dry, melt, and quench the weighed reagents, and then ball mill the quenched glass into glass powder. Mix the prepared Ba 0.3 Sr 0.7 TiO3 powder and the glass powder to obtain a mixed powder, add a PVA reagent, spray dry, and obtain a green body after pressing. Sinter the green body to obtain a dielectric ceramic material with high breakdown strength and high energy storage density. The present invention also discloses a dielectric ceramic material with high breakdown strength and high energy storage density. The present invention significantly reduces the melting temperature of the glass and the sintering temperature of the ceramic dielectric, and improves the breakdown performance and energy storage characteristics of the base dielectric ceramic.

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.

An epoxy formulation is provided with improved properties for electrical components exposed to a voltage differential. The improved electrical properties include increased glass transition temperature, increased breakdown strength and / or lower loss factor. Electrical components may be formed from the epoxy formulation by 3D printing the epoxy formulation and curing the formulation with UV radiation. The epoxy formulation includes epoxy, a photoinitiator and an accelerator.

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.