5974results about "Fixed capacitor dielectric" patented technology

The invention relates to the technical field of capacitor films, in particular to a high-temperature-resistant polypropylene capacitor film and a preparation method thereof.The high-temperature-resistant polypropylene capacitor film is prepared from, by weight, 94-98 parts of polypropylene resin, 1-3 parts of filler-doped modified balance adjusting agent, 0.5-2 parts of boron nitride-glass fiber combined agent, 0.05-0.4 part of nucleating agent, 0.2-0.4 part of antioxidant and 0.1-0.4 part of silane coupling agent; the high-temperature-resistant polypropylene capacitor film is obtained through the processes of melting extrusion molding, cooling shaping, preheating, two-way stretching, heat shaping, rolling and the like of the raw material composition. The polypropylene resin, the nucleating agent, the antioxidant and the silane coupling agent are blended, the filler-doped modified balance adjusting agent and the boron nitride-glass fiber coupling agent are added, and the raw materials are blended and coordinated, so that high feasibility of a two-way stretching process is guaranteed, breakdown resistance, mechanical strength and dielectric loss performance of the product are optimized, and the product has good mechanical properties. And meanwhile, the high-temperature-resistant and corrosion-resistant stability effects are remarkable.

To provide a multilayer electronic component having excellent reliability by preventing penetration of external moisture or plating solution.SOLUTION: According to one embodiment of the present invention, there is provided a multilayer electronic component which includes: a body including a dielectric layer and an internal electrode alternately disposed with the dielectric layer; an external electrode including a base electrode layer connected to the internal electrode; and an interface layer disposed between an end of the dielectric layer and the base electrode layer. The interface layer includes a first glass containing Ba, Zn, and Si, and the base electrode layer includes a second glass containing Ba and Si. When an average molar ratio (Ba / Si) of Ba to Si contained in the first glass is M1 and an average molar ratio (Ba / Si) of Ba to Si contained in the second glass is M2, M1 and M2 satisfy M1 / M2≥1.5.SELECTED DRAWING: Figure 5

A multilayer ceramic capacitor includes dielectric layers and internal electrode layers. Internal electrode layers adjacent to a first main surface define first main surface-side internal electrode layers, and internal electrode layers adjacent to the second main surface define second main surface-side internal electrode layers, first solid solution layers including a second metal as a solid solution is provided at interfaces between the first main surface-side internal electrode layers and the dielectric layers, the interfaces being in the first main surface-side internal electrode layers, and second solid solution layers including the second metal as a solid solution is provided at interfaces between the second main surface-side internal electrode layers and the dielectric layers, the interfaces being in the second main surface-side internal electrode layers. A concentration of the second metal in the second solid solution layer is higher than that of the second metal in the first solid solution layer.

The invention belongs to the field of dielectric materials and dielectric energy storage, and particularly relates to a fluorene polyester and polyaryletherurea blended dielectric energy storage polymer film and a preparation method thereof. The preparation method specifically comprises the following steps: adding fluorene polyester and polyaryletherurea into a solvent, fully dissolving to obtain a mixed solution, uniformly coating a substrate with the mixed solution, and then drying; and carrying out vacuum annealing on the dried film, and then carrying out curing treatment to strip the film from the substrate to obtain the fluorene polyester and polyaryletherurea blended dielectric energy storage polymer film, thereby improving the charge-discharge efficiency and high discharge energy density of the polymer under high temperature and high field, and solving the problems of high electric leakage loss and low cost of the existing polymer film. And the charging and discharging efficiency is low.

The invention belongs to the technical field of thin film capacitors, and particularly relates to a chemical grafting modified polypropylene capacitor film material and a preparation method and application thereof. According to the preparation method of the chemical grafting modified polypropylene capacitor film material, provided by the invention, diethylenetriamine ethyl acrylate with a plurality of specific groups such as amino groups and carboxyl groups and unsaturated double bonds is synthesized through esterification reaction, and the diethylenetriamine ethyl acrylate is introduced into a polypropylene material through chemical grafting to obtain chemical grafting modified polypropylene; the prepared polypropylene capacitor film material has the excellent properties of good compatibility, difficulty in film breakage, capability of adsorbing and removing residual moisture, difficulty in oxidation corrosion, excellent breakdown resistance and the like, and the preparation method is a preparation method of the high-performance polypropylene capacitor film material; therefore, the technical problem that a polypropylene capacitor film material prepared in the prior art is low in performance is solved.

A multilayer ceramic capacitor includes first, second, third, and fourth regions each adjacent to a corresponding one of end surfaces, a first middle region between the first and second regions, located closer to an outside of a multilayer body, and having higher coverage, a second middle region between the third and fourth regions, located closer to the outside of the multilayer body, and having higher coverage, a first sloped portion coupling the first region and the first middle region, a second sloped portion coupling the second region and the first middle region, a third sloped portion coupling the third region and the second middle region, and a fourth sloped portion coupling the fourth region and the second middle region.

The invention relates to a temperature characteristic controllable multilayer ceramic dielectric capacitor and a preparation method thereof, the multilayer ceramic dielectric capacitor is formed by a dielectric layer A and a dielectric layer B through mutual staggered superposition and firing, the dielectric layer A is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide A, rare earth oxide B, silicon dioxide, calcium carbonate and zirconium oxide, and the dielectric layer B is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide A, rare earth oxide B, silicon dioxide, calcium carbonate and zirconium oxide; the dielectric layer B is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide C, rare earth oxide D, silicon dioxide, calcium carbonate, zirconium oxide and nickel oxide; the multilayer ceramic dielectric capacitor is formed by the dielectric layers A and the dielectric layers B in a staggered and stacked mode through firing, the combination of the double dielectric layers is different from a traditional single dielectric layer, and the capacitor has the advantages of being high in dielectric constant and high in temperature stability at the same time.

The invention relates to the technical field of dielectric materials, and discloses polyimide, a polyimide film and a preparation method and application thereof, the polyimide is obtained by a polymerization reaction of a dianhydride monomer and a diamine monomer, the diamine monomer comprises a methylene bridging group and a phenyl group with a substituent group, and the methylene bridging group is a phenyl group with a substituent group. The substituent group at least comprises one methyl group. The molecular twisted conformation lock structure provided by the invention not only can improve the tolerance of polyimide, but also can doubly inhibit intrachain and inter-chain charge migration of the dielectric film, so that the dielectric film still has extremely high energy storage density and energy storage efficiency at a service temperature close to a glass-transition temperature.

A multilayer ceramic capacitor includes an element body portion including dielectric layers and internal electrode layers including Ni laminated in a thickness direction. In the internal electrode layers, a width of an opposing portion is larger than a width of a lead-out portion. The element body portion includes first, second, and third regions in order from an inside to an outside in the width direction in each of a region from an end portion on one side of the lead-out portion in the width direction to the first side surface and a region from an end portion on another side of the lead-out portion to the second side surface. When grain sizes of dielectrics included in the first, second, and third regions are respectively defined as gr1, gr2, and gr3, a relationship of gr1<gr2<gr3 is satisfied.

A capacitor provides a plurality of selectable capacitance values, by selective connection of six capacitor sections of a capacitive element each having a capacitance value. The capacitor sections are provided in a plurality of wound cylindrical capacitive elements. Two vertically stacked wound cylindrical capacitance elements may each provide three capacitor sections. There may be six separately wound cylindrical capacitive elements each providing a capacitor section. The capacitor sections have a common element terminal.

The invention discloses a polypropylene film for a bidirectional asynchronous stretching high-temperature-resistant three-layer structure capacitor and a preparation method of the polypropylene film. The film comprises a first surface layer, a second surface layer and a middle layer clamped between the two surface layers, the middle layer is made of polypropylene, the first surface layer is made of a cycloolefin copolymer (COC), and the second surface layer is made of polypropylene; the mass of the middle layer accounts for 85wt%-88wt% of the total mass, the mass of the first surface layer accounts for 5wt%-7wt% of the total mass, and the mass of the second surface layer accounts for 7wt%-8wt% of the total mass. The temperature resistance can be effectively improved by utilizing the characteristics of the cycloolefin copolymer, the film-forming property is improved by controlling the proportion content of the cycloolefin copolymer, the temperature resistance of the film can be improved to 125 DEG C or above, and the temperature resistance of the film is greatly improved. When the COC content is controlled to be 5%-7%, the film-forming property and the temperature resistance can be both considered, and the temperature reaches 125 DEG C.

A multilayer electronic component according to an example embodiment of the present disclosure may include: a body including a plurality of capacitance formation portions including first dielectric layers and internal electrodes alternately arranged in a first direction. An intermediate layer disposed is between the adjacent capacitance formation portions and includes a second dielectric layer. An external electrode is disposed on the body and connected to the internal electrode. The first and second dielectric layers may include a plurality of grains and pores. An average grain size of the first dielectric layer may be smaller than an average grain size of the second dielectric layer. A porosity of the first dielectric layer may be lower than a porosity of the second dielectric layer.

The invention discloses a polypropylene film for a film capacitor, the polypropylene film is composed of polypropylene and a cyclic olefin polymer, a plurality of gaps are distributed in the film, the gaps are approximately annular on the cross section of the film, and the inner diameter of the approximately annular gaps is 20-120nm. The invention also provides a preparation method of the polypropylene film, which comprises the following specific steps: putting the polypropylene and the cyclic olefin polymer into an extruder, heating and melting; the melt is extruded through a T-shaped die head and attached to a piece casting roller through an air knife for piece casting, and the temperature of the piece casting roller is 85-95 DEG C; the method comprises the following steps: preheating a cast sheet, longitudinally stretching at the stretching rate of 4-7 times and at the temperature of 135-150 DEG C, preheating the longitudinally stretched sheet at the temperature of 145-160 DEG C, transversely stretching at the stretching rate of 7-10 times and at the stretching temperature of 165-180 DEG C, and then entering a shaping area at the temperature of 168 DEG C; and carrying out corona treatment, rolling, curing and slitting on the heat-set film to obtain the product. The polypropylene film has good high temperature resistance and high pressure resistance, and is suitable for the field of capacitors.

An internal electrode layer includes therein a plurality of inner ceramic particles within an observation range of a cross-section intersecting the internal electrode layer. The position of the inner ceramic particles in the internal electrode layer relative to the center position of the internal electrode layer in the thickness direction is correlated with the position from the center position to the edge position, and the corresponding positions are indicated by the numbers 0-100. Such an index is referred to as Dsp. Inside the internal electrode layer, within a region of Dsp of 40 or less, preferably 30 or less, the inner ceramic particles are present in an area of at least 50% of the total area of the inner ceramic particles present within the observation range.

A multilayer ceramic capacitor includes an element body portion including dielectric layers and internal electrode layers laminated in a thickness direction, and external electrodes respectively on first and second end surfaces and electrically connected to the internal electrode layers. Each of the internal electrode layers includes an opposing portion opposed to another internal electrode layer, and a lead-out portion connected to the opposing portion and extending to the first or second end surface, a width of the opposing portion is larger than a width of the lead-out portion in the width direction, and a relationship of C1>C2 is satisfied when a continuity of an end portion of the opposing portion in the width direction is defined as C1 and a continuity of an end portion of the lead-out portion in the width direction is defined as C2.

A multilayer ceramic capacitor includes first and second counter portions. The first counter portion includes a first middle region and first and second regions. The second counter portion includes a second middle region, third and fourth regions. The first middle region has coverage higher than coverage of the first and second regions. The second middle region has coverage higher than coverage of the third and fourth regions. A dimension of each of the first and second middle regions is shorter than a distance between first and second external electrodes. A dimension at a center of an exposed portion in the length direction is longer that a maximum distance in a lamination direction between first and second covered portions, and shorter than a maximum distance in the lamination direction between both sides of the first and second external electrodes.

The invention discloses a high-entropy relaxation type lead-free perovskite ceramic and a preparation method thereof. The high-entropy relaxation type lead-free perovskite ceramic is a solid solution of Na < 0.2 > Bi < 0.2 > Ba < 0.2 > Sr < 0.2 > Ca < 0.2 >) TiO3 and (K < 0.5 > Na < 0.5 >) NbO3; the content of the (K0. 5Na0. 5) NbO3 accounts for 5 to 15 mol percent of the high-entropy relaxation type lead-free perovskite ceramic. By introducing (K0. 5Na0. 5) NbO3, energy band regulation and relaxation behavior adjustment are effectively realized, the breakdown electric field intensity is remarkably improved, the energy storage performance is improved, good stability is kept under the conditions of temperature, frequency and a circulating electric field, and the actual requirements of a pulse power capacitor on a high-performance and long-life energy storage dielectric material are met.

The invention relates to the technical field of dielectric materials, and discloses a composite dielectric material and a preparation method and application thereof.The composite dielectric material comprises filler and a base material, the filler is modified barium titanate, and the base material is cyanoethyl cellulose; the modified barium titanate comprises a barium titanate core and a shell, the shell comprises a polymer containing an epoxy group, the core and the shell are connected through a covalent bond, and an infrared spectrum test shows that in an infrared spectrogram of the modified barium titanate, characteristic peaks of the epoxy group and carbonyl respectively exist at 910 + / -10 cm <-1 > and 1720 + / -10 cm <-1 >. Epoxy groups in the modified barium titanate filler can react with hydroxyl groups in a cyanoethyl cellulose matrix material to form covalent linkage, compatibility of the filler and a matrix is improved, meanwhile, a potential well is formed, migration of carriers can be limited, and the composite material has good dielectric performance and energy storage performance.

A multilayer ceramic capacitor includes a multilayer body including dielectric layers and internal electrode layers laminated on each other, and first and second external electrodes. The internal electrode layers include first and second internal electrode layers each respectively electrically connected to the first and second external electrodes. The first and second internal electrode layers include holes having different area equivalent diameters. A thickness of each of the dielectric layers is about 0.5 μm or more and (area equivalent diameter D99)<about 0.0879×exp(2.86×t) is satisfied.

The multilayer electronic component includes a laminate in which internal electrodes and dielectric layers are alternately laminated, a base electrode, and an external electrode. The internal electrodes include a first internal electrode and a second internal electrode. The base electrode includes a first base electrode and a second base electrode. The external electrode includes a first external electrode and a second external electrode. Each of the first base electrode and the second base electrode contains a plurality of sintered bodies made of dielectric particles. At least a part of the plurality of sintered bodies is located at the interface between each base electrode and the laminate.

The invention relates to plasticity-enhanced lead lanthanum zirconium tin titanate-based antiferroelectric ceramic and a preparation method thereof. The chemical formula of the zirconium tin lead titanate lanthanum-based anti-ferroelectric ceramic is (Pb < 0.975-x > La < 0.02 > Sr < x >) (Zr < 0.5 > Sn < 0.37 > Ti < 0.13 >) < 0.9975 > O < 3 >, x is smaller than or equal to 0.10; and sintering by adopting a flash sintering technology to prepare the plasticity-enhanced lead lanthanum zirconate tin titanate-based antiferroelectric ceramic. Wherein the initial electric field intensity is set to be 100-300 V / cm, and the temperature rise rate of the flash sintering furnace body is 5-15 DEG C / min; when the reading of the current detector reaches the order of magnitude of [mu] A, the electric field intensity is increased to 200-500V / cm; after the current density value reaches 10-30 mA / mm < 2 >, the stable current density is kept for 90-200 s; preferably, the temperature rise rate of the flash burning furnace body is 8-12 DEG C / min.

A ceramic electronic device includes a multilayer structure in which each of a plurality of dielectric layers of which a main component is ceramic and each of a plurality of internal electrode layers are alternately stacked. The plurality of internal electrode layers include Ni and Sn. Each of an upper section and a lower section of the plurality of internal electrode layers includes multiple internal electrode layers each having a Sn concentration higher than that of each internal electrode layer of a center section interposed between the upper and lower sections in a stacking direction, which are constituted by top 5% or more and bottom 5% or more of the plurality of internal electrode layers, respectively.

The embodiment of the utility model relates to the field of capacitors, and particularly discloses a capacitor and electronic equipment, and the capacitor comprises a dielectric substrate which comprises a plurality of dielectric layers, the plurality of dielectric layers are superposed along a first direction, and the dielectric substrate comprises a first end and a second end along a second direction; the electrode layer comprises a plurality of first electrodes and a plurality of second electrodes, the first electrodes and the second electrodes are alternately arranged in the first direction, one dielectric layer is located between one first electrode and one second electrode, one end of each first electrode extends out of the first end of the dielectric substrate, one end of each second electrode extends out of the second end of the dielectric substrate, and the first electrode and the second electrode are alternately arranged in the first direction. The length of at least part of the first electrode along the third direction is greater than that of the second electrode along the third direction, and the first direction, the second direction and the third direction are mutually vertical pairwise. Through the above mode, the embodiment of the utility model can reduce the concentration of the internal stress of the capacitor, optimize the stress distribution, and improve the structural strength of the capacitor through the concave buffer section formed by the first electrode and the second electrode.

The invention relates to a flame-retardant breakdown-resistant metallized film and a capacitor, the flame-retardant breakdown-resistant metallized film comprises an aluminum shell, a capacitor core and an epoxy resin layer for packaging the capacitor core, and the capacitor core is formed by winding and metal spraying the flame-retardant breakdown-resistant metallized film; and preparing a metal coating on the surface of the flame-retardant modified insulating film through a vacuum coating process. According to the flame-retardant breakdown-resistant thin-film capacitor, through a manufacturing process of modifying an existing insulating base film, adding a flame retardant into polymer particles, and then spraying a corona auxiliary liquid on the thin film to be matched with corona treatment, the defects that the hot shrinkage rate of the thin film is too large and the impact strength is low due to the addition of the flame retardant can be overcome; and finally, the flame retardance and the breakdown resistance of the thin film capacitor are remarkably improved.

Liquefied natural gas brings energy overriding and environmental disruption. However, the liquefied natural gas is a liquid dielectric medium, can be easily liquefied by pressurizing at room temperature, can be expanded by more than 250 times in volume during gasification, and is relatively high in dielectric constant and relatively low in voltage resistance. As a capacitor, such a liquid dielectric is considered; the energy of the liquid dielectric capacitor is consumed inside the capacitor for an engine, welding or buoyancy gas generation, or is consumed outside the capacitor for use as an on-board capacitor for a vehicle. [Solution] A liquid dielectric capacitor is considered as a dielectric breakdown induced igniter that can replace a conventional spark plug. In order to utilize the principle of such an igniter as an energy source for an engine, a welding device or a buoyancy bag for lifting a subsea resource, an electrical charge is applied to the liquid dielectric thin layer, and then the thickness of the liquid dielectric thin layer is made close to zero to cause dielectric breakdown, or the thickness of the liquid dielectric thin layer is increased to cause breakdown of the liquid dielectric thin layer. A high voltage source is established for a vehicle-mounted capacitor of the vehicle. Therefore, a world without environmental damage is realized.

The embodiment of the invention provides a ceramic diaphragm automatic positioning system based on high-precision visual feedback and closed-loop control, and the system comprises a parameter reference setting module which is used for setting a theoretical reference point and a visual detection parameter; the real-time visual detection module is used for collecting an image of the to-be-stacked film and outputting an image coordinate of the mark point; the core operation module is used for converting the image coordinates of the mark points into actual coordinates based on the visual detection parameters, reading a theoretical reference point of the current to-be-stacked diaphragm and calculating a position error vector between the actual coordinates and the theoretical reference point, and the position error vector comprises a translation compensation amount and a rotation compensation amount; and the motion control and closed loop feedback module is used for receiving the position error vector and generating a control instruction to drive the workbench to move. According to the system, through parameterized reference setting, real-time visual detection, intelligent error calculation and real-time motion compensation, the technical limitation is effectively overcome, and the lamination alignment precision and efficiency are remarkably improved.

The invention relates to the technical field of dielectric materials, in particular to a diamine monomer crosslinking modified fluorine-containing ferroelectric polymer, a preparation method and a device. The diamine monomer cross-linked modified fluorine-containing ferroelectric polymer comprises the following components: a semi-crystalline thermoplastic fluorine-containing ferroelectric polymer and a diamine cross-linking agent, the semi-crystalline thermoplastic fluorine-containing ferroelectric polymer is polyvinylidene fluoride with ferroelectricity and a copolymer derivative thereof; the diamine cross-linking agent is short-chain diamine containing a rigid structure; the mass fraction of the diamine cross-linking agent is 0.25%-10% compared with the total mass fraction. The thin film prepared by the invention meets the application requirements of improvement of dielectric constant, reduction of dielectric loss, reduction of leakage current, improvement of breakdown field strength and the like in a high electric field.

The present invention belongs to the technical field of microwave dielectric ceramics, and discloses a reducing-resistant microwave dielectric ceramic temperature-frequency characteristic regulator. Among them, the application of a microwave dielectric ceramic material as a microwave dielectric ceramic temperature-frequency characteristic regulator, and the chemical formula of the microwave dielectric ceramic material satisfies (AO)3(BO)(XO2)2, where A = Ba x Sr y , B = Mn h Mg k , X = Si m Ti n ; x + y = 1, h + k = 1, m + n = 1, 0 ≤ x ≤ 1, 0.6 ≤ h ≤ 1, 0.8 ≤ m ≤ 1; and when h = 1 and m = 1, x ≠ 0; this microwave dielectric ceramic material can be adjusted by addition to regulate the overall temperature coefficient of resonance frequency of the ceramic system. By improving the composition of the material, the obtained microwave dielectric ceramic material has the characteristics of adjustable dielectric constant, low dielectric loss, and high positive temperature coefficient of resonance frequency, and can especially be used as a microwave dielectric ceramic temperature-frequency characteristic regulator with a strong regulation effect.

The invention relates to the technical field of capacitor films. The invention discloses a preparation process of a high-performance polypropylene capacitor film. The preparation process comprises the following steps: A1, preparing a polypropylene capacitor film; a2, carrying out surface cleaning and activation pretreatment on the polypropylene capacitance film; a3, evaporating a gradient modified layer on the surface of the pretreated polypropylene capacitance film; a4, carrying out laser plasma synergistic treatment and crystallinity regulation and control on the modified polypropylene capacitor film; and A5, coating the outer layer of the modified polypropylene capacitance film with a functional layer, and carrying out annealing post-treatment to prepare the high-performance polypropylene capacitance film. The mechanical strength and the electrical stability are improved through nano filler dispersion, two-way stretching and crystallinity regulation and control; through the collaborative design of surface cleaning and activation and a gradient functional layer, excellent interface bonding force and environmental adaptability are given; and by means of technologies such as multi-source evaporation and laser plasma co-processing, precise regulation and control and diversified expansion of the performance are achieved, the method is suitable for various scenes, and the process repeatability is good.

A multilayer ceramic capacitor includes an element body portion including dielectric layers and internal electrode layers including Ni, and external electrodes. In each internal electrode layer, a width of an opposing portion is larger than a width of a lead-out portion. The element body portion includes side margin portions extending from both end portions of the opposing portion to first and second side surfaces, through a central portion in a length direction, and parallel or substantially parallel to a thickness direction and a width direction. A dielectric layer between adjacent internal electrode layers in the thickness direction includes grains including pores. Each of the side margin portions includes a dielectric including grains that do not include pores.