1352 results about "Ceramic capacitor" patented technology

The invention discloses a temperature and pressure sensor and a manufacturing method thereof, the temperature and pressure sensor comprises a support assembly formed by an inner support and a thermistor through an injection molding process, two pin copper wires of the thermistor are welded to an insertion piece of the inner support, and a plastic supporting structure wrapping the thermistor and the inner support is formed through injection molding; one end of a PIN needle of the terminal button is connected with an external plugging port; one end of a conductive circuit of the flexible wire board is respectively welded with the PIN of the ceramic capacitor and the insertion piece of the inner bracket, and the other end of the conductive circuit of the flexible wire board is welded with the other end of the PIN of the terminal button; a through hole is formed between the support assembly and the shell, a medium makes contact with the ceramic capacitor through the through hole, the ceramic capacitor transmits a pressure signal to the outside through the flexible wire board and the end button, the thermistor senses the temperature of the medium through the plastic supporting structure, and a temperature signal is transmitted to the outside through the inserting piece, the flexible wire board and the end button. The thermistor is effectively prevented from losing efficacy due to medium impact, and meanwhile, the structural process is relatively simple and easy to assemble.

The invention discloses a high-voltage multi-core ceramic capacitor and a preparation method thereof, and the multi-core ceramic capacitor comprises a pedestal, two connection frames which are oppositely disposed on the pedestal, and a plurality of capacitor modules which are sequentially arranged in the length direction of the connection frames. The capacitor module comprises a plurality of capacitors which are sequentially connected in series between two connecting frames and a plurality of series connecting sheets which are respectively arranged between two adjacent capacitors, and the connecting frames are connected with the opposite capacitors; the capacitor comprises a capacitor body, two parallel frames oppositely arranged on the two sides of the capacitor body, a potting shell used for installing the capacitor body and a potting layer arranged in the potting shell and wrapping the capacitor body. The specific structure of the capacitor module is limited to be matched with the connecting frame, so that parallel capacity increasing and series voltage dividing of the multiple capacitor chips are achieved, other capacitor modules are not affected after a certain capacitor module fails, and the market requirement of higher-voltage products is met.

In a multilayer ceramic capacitor, a segregation amount of silicon and magnesium on an outer layer side of an outermost internal electrode layer is larger than a segregation amount of silicon and magnesium on an inner layer side of the outermost internal electrode layer, and when a region defined by an existence region of the outermost internal electrode layer and a segregation region of silicon and magnesium in contact with the outermost internal electrode layer is defined as a first region, a line edge roughness of an outer layer side of the first region is larger than a line edge roughness of an inner layer side of the first region.

The invention provides a high-voltage low-loss dielectric material and a preparation method thereof, and relates to the technical field of high-voltage ceramic capacitors, and the high-voltage low-loss dielectric material comprises the following raw materials in parts by mass: 35-38 parts of barium titanate, 20-29.5 parts of strontium titanate, 15-17.5 parts of titanium dioxide, 9-12 parts of bismuth oxide, 3-4 parts of zirconium oxide, 0.8-1.0 part of X, 1.2-1.4 parts of antimony oxide, 1-1.2 parts of calcium carbonate and the like. The preparation method of the dielectric material comprises the following steps: 1, preparing the dielectric material; melting calcium carbonate, magnesium oxide, zinc oxide and the like, performing water quenching, and performing ball-milling granulation to obtain zinc borosilicate glass powder; uniformly mixing the zinc borosilicate glass powder with barium titanate, strontium titanate, titanium dioxide and the like, and granulating to obtain oxide powder; and tabletting and sintering the oxide powder to obtain the high-pressure low-loss dielectric material. The high-voltage low-loss dielectric material is high in dielectric constant, small in dielectric loss, high in compression strength and good in high-temperature stability, and the preparation method is simple.

The utility model relates to the technical field of ceramic capacitor production equipment, and provides a uniform material scattering mechanism for a ceramic capacitor, which comprises a base, a support rod, a top plate, a material supply box, a material channel, a material uniformizing plate, a height adjusting assembly and a straight vibrator, the material channel comprises a material guide plate, a left side plate, a right side plate and a rear side plate, the left side plate, the right side plate and the rear side plate are fixedly arranged on the material guide plate, the material uniformizing plate is located between the left side plate and the right side plate, the material uniformizing plate is further located above the material guide plate, the material guide plate is provided with multiple sections of material guide areas, material guide grooves are distributed in the material guide areas, and the material uniformizing plate is located above the material guide areas. From the material receiving opening of the material channel to the material discharging opening of the material channel, the number of the material guiding grooves of the material guiding area is increased section by section, and the width of the material guiding grooves is reduced section by section. The utility model has the advantages that the material channel with a unique structure is arranged to prevent the ceramic capacitors from being stacked, so that the ceramic capacitors are uniformly scattered on the burning net from the discharge port of the material channel, the burning net is effectively prevented from being stacked, and the sintering quality of the ceramic capacitors is improved.

The invention provides an MLCC short-circuit product defect position analysis method, and belongs to the technical field of multilayer ceramic capacitor failure analysis. The method comprises the following steps: carrying out rapid leakage current detection on MLCC products for 0.5-2 seconds, and screening out short-circuit products of which the leakage current is greater than a first preset threshold value; products with crack defects are eliminated through an acoustic scanning microscope; gradually applying increased direct-current voltage to the screened crack-free short-circuit product, monitoring leakage current in real time, and terminating the test when the sudden change amplitude of the current exceeds a second preset threshold value; then acoustic scanning is carried out on the protective cover surface and the cutting surface, and two-dimensional coordinates of defect points on the two surfaces are extracted; and calculating the three-dimensional coordinates of the defect in the MLCC through image registration and a spatial inversion algorithm. According to the method, the internal hidden short circuit defect can be identified and positioned in a non-destructive manner, the positioning precision and the analysis efficiency are improved, and the method is suitable for batch failure analysis and manufacturing process optimization.

Provided is a multilayer ceramic capacitor capable of reducing stress.　A base electrode layer 32 of an external electrode 30 in this multilayer ceramic capacitor 10 includes an end surface electrode part 40 and a wraparound electrode part 41 that wraps around at least one among a first main surface 12a, a second main surface 12b, a first side surface 12c, and a second side surface 12d from a first end surface 12e and a second end surface 12f. The wraparound electrode part 41 includes base end side parts 42 positioned on the first end surface 12e and the second end surface 12f sides, and tip side parts 43 positioned on the tip sides of the base end side parts 42 away from the first end surface 12e and the second end surface 12f. At least one tip-side adhesion interface 53a where a laminate 12 is adhered to the tip side parts 43, and at least one tip-side non-adhesion interface 53b where the laminate 12 is not adhered to the tip-side parts 43, are included in tip-side interfaces 53 of the laminate 12 facing the tip-side parts 43.

A broadband filter plate type tantalum capacitor comprises a lead frame, a tantalum core and a ceramic capacitor, a positive electrode and a negative electrode of the tantalum core are connected with a positive electrode frame and a negative electrode frame of the lead frame respectively, the positive electrode frame and the negative electrode frame are connected through the ceramic capacitor, and the tantalum core and the ceramic capacitor are of a parallel structure. According to the utility model, through the design of the lead frame and the parallel combination mode of the ceramic capacitor and the tantalum capacitor, the volume efficiency maximization of the tantalum capacitor and the volume maximization of the tantalum core are realized, the reliability and the stability of the tantalum capacitor are improved, the use is simple, and the effect is obvious.

The invention discloses a ceramic capacitive pressure sensor, which comprises a packaging shell, a commercial small circular shell is arranged on the packaging shell, a copper pipe is arranged on one side, far away from the packaging shell, of the commercial small circular shell, an electronic wire is arranged on the packaging shell in a penetrating manner, and the electronic wire is connected with the packaging shell. The insulating paper, the inner copper body and the check ring are integrally designed into the combined base with the PPS and the glass fiber wrapping the SUS metal inner container, a traditional multi-part manual assembly structure is replaced, and compared with the scheme that in the prior art, insulating paper and an inner copper body shielding cover need to be bonded, the number of parts is reduced, and the cost is reduced. The cost is reduced, meanwhile, automatic injection molding is achieved, manual assembly errors are avoided, the assembly efficiency is improved, the compression strength of the PPS composite reinforcing material is improved compared with that of traditional insulation paper, and the reliability in the high-pressure-resistant environment is ensured.

The invention relates to the technical field of dielectric ceramic powder preparation processes, in particular to a multilayer ceramic capacitor, high-activity nano barium titanate powder for the multilayer ceramic capacitor and a preparation method of the high-activity nano barium titanate powder, and the method comprises the following steps: (1) reacting soluble barium salt with a precipitator to obtain barium carbonate precursor particles with high specific surface area; (2) uniformly coating the surfaces of the barium carbonate precursor particles with nano titanium dioxide particles by using a supercritical fluid flash evaporation technology to form a composite precursor; and (3) carrying out solid-phase synthesis reaction on the composite precursor, and sintering to obtain the nano barium titanate powder. Through the synergistic effect of two means of high-activity precursor preparation and nanoscale uniform coating, the composite precursor with extremely high specific surface area, surface energy and microcosmic uniformity is prepared, the thermal sintering temperature is effectively reduced, abnormal growth of crystal grains and lattice distortion are restrained, and the preparation method has the advantages that the preparation process is simple, and the preparation cost is low. The tetragonality of the nano barium titanate powder is obviously improved.

The present application relates to the technical field of dielectric ceramic powder preparation, and particularly relates to a multilayer ceramic capacitor, a high-activity nano-barium titanate powder for the multilayer ceramic capacitor and a preparation method of the high-activity nano-barium titanate powder, the method comprising the following steps: (1) reacting a soluble barium salt with a precipitator to obtain barium carbonate precursor particles with high specific surface area; (2) uniformly coating nano-titanium dioxide particles on the surface of the barium carbonate precursor particles by using a supercritical fluid flash technology to form a composite precursor; and (3) performing a solid-phase synthesis reaction on the composite precursor and sintering to obtain nano-barium titanate powder. The present application, through the synergistic effect of the two means of "high-activity precursor preparation" and "nano-level uniform coating", prepares a composite precursor with extremely high specific surface area, surface energy and micro-uniformity, effectively reduces the heat sintering temperature, suppresses abnormal grain growth and lattice distortion, and significantly improves the tetragonality of the nano-barium titanate powder.

The invention discloses a barium zirconate titanate-based ceramic capacitor dielectric material and a preparation method thereof. The ceramic material comprises the following components: (1-x) Ba (ZryTi1-y) O3-xCa (V2 / 3Mg1 / 3) O3, ZnO and MnO2, the preparation method comprises the following steps: firstly, mixing a Ba source, a Zr source, TiO2, a Ca source, V2O5 and a Mg source, then carrying out hydrothermal reaction, carrying out suction filtration and drying on the product to prepare main crystal phase powder, then adding MnO2 and ZnO into the main crystal phase powder, and carrying out grinding, granulation, molding, glue discharging and sintering to prepare the ceramic capacitor dielectric material. According to the ceramic material disclosed by the invention, the aims of improving the dielectric temperature stability of a capacitor ceramic dielectric and reducing the dielectric loss are fulfilled through the combined action of an A and B site ion compound perovskite compound system consisting of barium zirconate titanate and calcium vanadium magnesium acid and the secondary dopant.

A multilayer ceramic capacitor includes a multilayer body including dielectric layers and internal electrodes alternately laminated therein, and two end surfaces opposing each other in a length direction, and two side surfaces opposing each other in a width direction, and two external electrodes respectively on the two end surfaces of the multilayer body. At least one of two opposed main surfaces of the multilayer ceramic capacitor includes raised portions provided respectively on one side and another side with a middle portion of the main surface interposed therebetween. The raised portions are each raised to become thicker in the lamination direction from the middle portion toward an outer periphery of the main surface.

The invention relates to a base metal high-voltage multilayer ceramic dielectric capacitor and a preparation method, the base metal high-voltage multilayer ceramic dielectric capacitor is formed by stacking and firing dielectric layers, and each dielectric layer comprises a dielectric layer and an electrode printed on the dielectric layer. The dielectric layer comprises the following raw materials: a BMYT main matrix, an NN material, magnesium oxide, manganous-manganic oxide, zirconium dioxide, calcium carbonate, strontium carbonate and rare earth oxide; through the raw material composition and the preparation method of the ceramic dielectric capacitor, the prepared ceramic dielectric capacitor has excellent performances of high dielectric constant, high voltage resistance, stable dielectric-temperature characteristic curve, low loss, high insulation resistance, long-term high-voltage reliability and the like under the condition of high dielectric thickness (30 microns before firing).

The invention relates to the technical field of capacitor manufacturing, and discloses a block lamination method of a multilayer ceramic capacitor, which comprises the following steps of: feeding protective films, cutting the protective films in a protective film conveying process, stacking a plurality of protective films on a protective film stripping table, and simultaneously adsorbing the plurality of protective films to a lamination carrying table; laminating a bottom protective film, feeding a dielectric film roll, and cutting in a dielectric film conveying process; the dielectric diaphragms are laminated, and the in-place identification mode of the dielectric diaphragms is optimized; laminating a top protective film; the invention also discloses a block lamination device of the multilayer ceramic capacitor, the protective film conveying mechanism is provided with a first vertical cutting assembly and a first transverse cutting assembly, and the dielectric film conveying mechanism is provided with a second vertical cutting assembly and a second transverse cutting assembly; according to the invention, the lamination efficiency of the block lamination is improved, so that the dielectric diaphragm only needs to be provided with a mark point and does not need to be provided with a stripping mark point, the width required by the dielectric diaphragm is reduced, and materials are saved and dangerous waste materials are reduced.

In a multilayer ceramic capacitor, a plurality of internal electrode layers include a first internal electrode layer, a second internal electrode layer, and an intermediate electrode layer. A coverage of the intermediate electrode layer is higher than a coverage of the first internal electrode layer and the second internal electrode layer.

The present disclosure provides a multilayer ceramic capacitor which can be manufactured even at a relatively low firing temperature and has excellent moisture resistance. The capacitor includes: a capacitor portion in which dielectric layers and internal electrode layers are alternately stacked; and a coating layer disposed on the outside in the stacking direction of the capacitor part, in which the coating layer contains a perovskite-type compound represented by general formula ABO3 and contains, in a metal state, one or more elements selected from Cu, Au, Ag, Al, Ir, and W, and the number of atoms of the elements is 0.002-0.15 with respect to the number of atoms of B-site elements of the general formula 100.

The utility model relates to the technical field of electric power, in particular to a solid-sealed polar pole, which is applied to a medium-voltage power grid and used for extracting current signals, voltage signals and a power-taking power supply from the medium-voltage power grid, and further comprises a vacuum arc-extinguishing chamber, the transition piece and the spring contact finger are movably connected to the output end of the vacuum arc-extinguishing chamber; the conducting rod is connected with the spring contact finger and extends to the wire outlet side of the medium-voltage power grid; the current and voltage sensor group comprises an incoming line side voltage sensor of which the high-voltage end is connected with the incoming line side of the medium-voltage power grid and the low-voltage end is grounded; the high-voltage end of the wire outlet side voltage sensor is connected with the conducting rod, and the low-voltage end is grounded; the zero sequence current sensor and the phase current sensor are sleeved on the conducting rod; the high-voltage low-temperature-drift ceramic capacitor is adopted, one-time integral solid sealing is achieved, meanwhile, the current and voltage sensor set and the capacitor electricity-taking power source set are integrated, one-time integral solid sealing is achieved, the manufacturing process is simplified, and the insulation reliability is improved.

A multilayer ceramic capacitor includes first, second, third, and fourth main surface-side external electrodes respectively including first, second, third, and fourth recesses recessed toward a multilayer body. In a cross-sectional view along a length direction and a lamination direction, an intersection of a first virtual line connecting the first recess and the fourth recess and a second virtual line connecting the second recess and the third recess is located between a first capacitor portion and a second capacitor portion in the length direction. External electrodes each having tensile stress as a residual stress are provided.

The invention provides a full-automatic ceramic capacitor arrangement machine which comprises a feeding and discharging conveying line and an arrangement machine, the feeding and discharging conveying line comprises a feeding position and a discharging position, and the feeding and discharging conveying line is used for conveying a screen frame on which a plurality of material carriers are placed. The arranging machine comprises a machine table, a first mechanical arm, an overturning dust removal station, a second mechanical arm, a temporary discharging and jacking station, a net pressing and centering station and an arranging station. The overturning dust removal station comprises an overturning mechanism and a dust removal mechanism; the temporary placing and jacking station comprises a temporary placing table; the net pressing and centering station comprises a centering mechanism and a net pressing mechanism, the centering mechanism is used for conducting centering operation on the material carrier, and the net pressing mechanism can conduct pressing operation on the material carrier; the arrangement station comprises a feeding device and an arrangement mechanism, the arrangement mechanism comprises a Y-axis linear driving device, a Y-axis sliding plate, a clamping mechanism and a plurality of material carrying assemblies, the feeding device can spread products and output the products to a material carrier, manpower can be saved, and the production efficiency can be improved.

In a multilayer ceramic capacitor, internal electrodes include counter portions opposed to adjacent internal electrodes in a lamination direction and first extension portions extending from the counter portions and each being connected to a corresponding one of a pair of external electrodes. A multilayer body includes an effective layer portion including the counter portions and portions of dielectric layers sandwiched by adjacent counter portions. The first extension portions each include a bent portion including an apex protruding in a direction toward a center in the lamination direction. A shortest distance in a length direction between the apex of the bent portion and the effective layer portion is larger than a dimension of a corresponding one of the dielectric layers, and is smaller than a shortest distance in the length direction between the apex of the bent portion and a corresponding one of first and second end surfaces.

To provide a multilayer ceramic capacitor in which occurrence of cracking or chipping at a boundary part between an end face side ineffective part and a vertical ridge line ineffective part of a laminated body is prevented.SOLUTION: A multilayer ceramic capacitor 1 includes: a multilayer body 10 including a plurality of stacked dielectric layers 20 and a plurality of internal electrode layers 30; and an external electrode 40 disposed so as to be electrically connected to the internal electrode layers 30. An outer surface of the multilayer body 10 at a boundary part VLB between an end face side ineffective part LG and a vertical ridge line ineffective part VG, the outer surface of a vertical ridge line ineffective part VG, and the outer surface of the multilayer body at a boundary part VWB between the vertical ridge line ineffective part VG and the side face side ineffective part WG form a continuous curved surface VR protruding outward in a plan view from a multilayer direction T, and a protective film SC containing carbon and silicon as constituent elements is formed on the curved surface VR.SELECTED DRAWING: Figure 3

The invention relates to a ceramic capacitor dielectric material and a preparation method and application thereof, and belongs to the field of ceramic capacitor dielectric materials. The problems that an X7R / X8R type ceramic capacitor material cannot meet the high-temperature application requirement, loss is high, and stability is insufficient are solved. The invention provides a dielectric material for a ceramic capacitor. The dielectric material is prepared from the following components in percentage by weight: 96.5 percent of BaTiO3, 3.5 percent of CaZrO3, 1.26 percent of NiO: Nb2O5 and 0.3 to 0.5 percent of MnCO3. According to the ceramic capacitor dielectric material, the capacitance change rate delta C / C25 DEG C is smaller than or equal to + / -15% within the range of-55 DEG C to 200 DEG C, and the X9R standard is met; the dielectric constant is as high as 4265, and the dielectric loss is as low as 0.012; the step-by-step pre-sintering and gradient sintering process inhibits abnormal growth of crystal grains, the density is improved, and the repeatability is high; the method does not need complex equipment and is suitable for industrial production.

A method for manufacturing a multi-layer ceramic capacitor (MLCC) end electrode and printing a full-area inner electrode protective layer is disclosed. The method uses thin dielectric ceramic layer thickness and a plurality of nickel inner electrode stacks to achieve high capacitance. The method produces high-density electrode-to-ceramic ratio end edges and side edges. The method uses an ultralow-temperature electrochemical deposition coating technology to manufacture a low-stress multi-layer ceramic capacitor end electrode and an insulating protective layer, thereby improving the yield of the multi-layer ceramic capacitor and reducing manufacturing costs.

A multilayer ceramic capacitor includes internal electrode layers including first internal electrode layers, second internal electrode layers, and intermediate electrode layers. At least a portion of each of the intermediate electrode layers has a coverage higher than a coverage of a region of a first counter portion of each of the first internal electrode layers adjacent to a first end surface, and a coverage higher than a coverage of a region of a second counter portion of each of the second internal electrode layers adjacent to a second end surface.

The utility model discloses a high and low temperature testing device for a chip ceramic capacitor. The high and low temperature testing device comprises a multi-channel capacitance testing clamp mechanism and an external measuring device which is connected with a metal probe in the multi-channel capacitance testing clamp mechanism through a lead, the multi-channel capacitor test fixture mechanism is a mechanism which adopts a plurality of contact pairs to respectively contact two end electrodes of a plurality of capacitors, one contact in each contact pair comprises an elastic movable metal probe, and the other contact in each contact pair comprises a fixed metal probe. According to the utility model, a plurality of capacitors or capacitors with different sizes can be tested at one time in different high and low temperature environments, the test precision can meet the requirement, and the test requirement of a large number of capacitors can be met.

A multilayer ceramic capacitor includes a ceramic body including a plurality of first and second internal electrodes alternately laminated via a plurality of ceramic layers in the direction of the first axis; and first and second external electrodes covering the end surfaces of the ceramic body, respectively, wherein the plurality of first and second internal electrodes respectively include a plurality of first and second standard internal electrodes having a common configuration, respectively, and a plurality of first and second special internal electrode that have a configuration different from the plurality of first standard internal electrodes, and wherein the plurality of first and second special internal electrodes are successively laminated in a section of the ceramic body that is closer to one side of one of the first and second main surfaces than a center in the direction of the first axis.

The invention discloses a dual-electrode-based high-sensitivity differential pressure ceramic capacitive sensor and a measurement method thereof, and belongs to the technical field of pressure sensors. The sensor comprises a ceramic substrate, a dual-electrode structure, a differential pressure sensitive diaphragm and a signal processing module. The two electrodes are symmetrically distributed on the two sides of the diaphragm, when the diaphragm is subjected to the differential pressure effect on the two sides, capacitance changes reversely, high-sensitivity detection of the differential pressure is achieved through a differential calculation formula, and the sensitivity is improved by two times compared with a single electrode. And the ceramic plate integrates an overvoltage protection function, so that the diaphragm is prevented from over-limit deformation. The design solves the problems that a traditional sensor is low in sensitivity and weak in interference resistance in tiny differential pressure detection, and can be widely applied to the fields of industrial pressure monitoring, automobile differential pressure control, new energy battery thermal management and the like. And the reliability and the precision are remarkably improved by a dual-electrode differential structure and an overvoltage protection mechanism, and an innovative scheme is provided for the design of a high-cost-performance capacitor core body.

The utility model relates to a grounding structure of a ceramic capacitive pressure sensor. The utility model comprises a metal shell which is provided with an annular cavity; the plastic socket comprises a connecting column extending into the annular cavity; the printed circuit board is arranged in the annular cavity; and the grounding insert comprises an annular part and a connecting part, wherein the annular part is respectively propped against the side walls of the annular cavity and the connecting column, and the connecting part extends to the annular part, is partially embedded in the plastic socket and is connected with the printed circuit board. The utility model solves the problems that the ground lug of the ceramic pressure sensor in the prior art is easy to break during assembly and the ground lug is loose and poor in contact after long-time use.

The invention relates to the technical field of release film materials, in particular to a bimodal nano-system anti-bonding master batch for an MLCC (multilayer ceramic capacitor) base film and a preparation method of the bimodal nano-system anti-bonding master batch. The anti-bonding master batch comprises the following components in parts by weight: 85-98 parts of thermoplastic resin; 1 to 15 parts of a modified inorganic nanoparticle complex; 0.1 to 1 part of an auxiliary agent; the modified inorganic nanoparticle complex is prepared from the following raw materials: a silane coupling agent and an inorganic nanoparticle complex; the inorganic nano particle complex comprises SiO2 and Al2O3, and the inorganic nano particle complex comprises SiO2 and Al2O3; the particle size of the inorganic nano particle complex is 50 to 500 nm. The technical problems that inorganic nanoparticles are poor in dispersity and easy to agglomerate in PET resin are solved through a bimodal nanoparticle compounding and surface modification technology, the surface of the MLCC release film is endowed with ultralow roughness, and the comprehensive performance of an MLCC product is remarkably improved.