15results about How to "Reduce potential difference" patented technology

A novel graphite boat comprises a graphite block and a plurality of boat pieces arranged in parallel, the graphite block and the boat pieces form an included angle of 90 degrees, the graphite block is connected with the boat pieces through graphite screws, and the novel graphite boat is characterized in that a fixed interval is arranged between every two adjacent boat pieces, and the width of the fixed interval is gradually increased from the center to the two sides. According to the utility model, through the non-equal-interval design, the intervals of the outer-layer boat pieces of the graphite boat are increased, and the potential difference of the adjacent outer-layer boat pieces during discharging is reduced in the process, so that the film forming color difference caused by temperature difference is optimized, and the effect that the appearance color of the formed film is consistent is achieved; rework and damage can be effectively reduced, the one-time yield is improved, the cost is further reduced, and the production efficiency is improved.

This application relates to a semiconductor device and a method for fabricating the same. The semiconductor device includes: a first substrate, comprising a main body portion and at least one protrusion disposed on the main body portion; at least two second substrates disposed on the main body portion, with a protrusion located between any two adjacent second substrates; at least two isolation regions, corresponding one-to-one within the at least two second substrates; each isolation region enclosing a device region within its corresponding second substrate; at least two first well regions, corresponding one-to-one with the at least two second substrates, each first well region being located within its corresponding device region on the second substrate; and a first conductive structure electrically connected to the first substrate; wherein the first substrate, second substrates, and first well regions are of a first conductivity type, and the doping concentration of the first substrate is greater than the doping concentration of the first well regions; the isolation regions are of a second conductivity type. This application can improve the latch-up effect of semiconductor devices.

The invention discloses a preparation method and application of a rare earth magnesium alloy surface micro-arc oxidation film layer manufactured through electric arc additive manufacturing, and relates to the technical field of additive manufacturing light metal surface treatment. The preparation method comprises the following steps: manufacturing a rare earth magnesium alloy through electric arc additive manufacturing; carrying out homogenizing heat treatment on the rare earth magnesium alloy subjected to electric arc additive manufacturing; performing earlier-stage treatment; preparing an inner-layer alkaline electrolyte and an outer-layer alkaline electrolyte; and step-type voltage micro-arc oxidation treatment: taking stainless steel as a cathode, taking the magnesium alloy as an anode, sequentially putting the stainless steel and the magnesium alloy into the inner-layer alkaline electrolyte and the outer-layer alkaline electrolyte for micro-arc oxidation, cleaning and drying to obtain a micro-arc oxidation film layer on the surface of the magnesium alloy. According to the preparation method, the problems that a traditional micro-arc oxidation coating is loose, porous, prone to corrosion and short in service life are solved, the corrosion resistance of the magnesium alloy is effectively improved, the magnesium alloy is prevented from volatilizing under the high-temperature condition, the working requirement of a satellite support in the space environment is met, and the application range of the magnesium alloy is widened.

The invention relates to the technical field of permanent magnet preparation, and particularly discloses a high-temperature-resistant neodymium-iron-boron magnet and a preparation method thereof. The high-temperature-resistant neodymium-iron-boron magnet comprises the following elements in percentage by mass: 17.4%-19.5% of Nd, 0.66%-0.72% of B, 38.37%-41.19% of Fe, 0.36%-4.8% of Dy, 0.18%-0.3% of Nb, 0.18%-0.3% of Al, 0.03%-0.09% of Cu, 29.1%-34.8% of an alloy rapid hardening sheet and the balance of unremovable impurities, wherein the alloy rapid hardening sheet contains Pr, Tb, Bi and Sn; the preparation method comprises the following steps: grinding the surface of an alloy rapid hardening sheet to be bright, mixing the alloy rapid hardening sheet with a pretreated magnet block, adding zirconium oxide balls, putting into a reaction kettle of a rotary diffusion furnace, vacuumizing the reaction kettle, introducing argon, rotating at the rotating speed of 4-6r / min, keeping the temperature at 700-704 DEG C for 3-7h, and carrying out rotary diffusion, so as to obtain the zirconium oxide-based composite material. And then carrying out heat preservation at 850-950 DEG C for 2-4 hours for high-temperature diffusion and heat preservation at 450-550 DEG C for 2-4 hours for tempering heat treatment by using a vacuum tube furnace in a vacuum environment. The high-temperature-resistant neodymium-iron-boron magnet has the advantage that the defect that heat resistance of a conventional neodymium-iron-boron magnet is still insufficient is overcome.

The application provides a method for improving the bonding force of a neodymium iron boron deposition layer based on a reinforced ion exchange deposition technology, and belongs to the technical field of rare earth permanent magnet material preparation. The method comprises the following steps: neodymium iron boron magnet cleaning pretreatment, removing contaminants and metal oxides on the surface of the magnet; activating the neodymium iron boron magnet by acid corrosion to obtain a pretreated magnet with a rough surface; soaking the pretreated magnet in an electrolyte and connecting the magnet to a negative electrode; and performing ion exchange deposition on the surface of the magnet to be deposited by applying a pulse variable frequency electric field on the surface of the magnet to prepare a deposition layer; wherein, the surface of the magnet is first modified by micro-electrolysis, and then the ion exchange deposition is performed by applying a variable frequency electric field. In the initial stage, the surface of the magnet is continuously subjected to micro-electrolytic corrosion by a stable current to regulate the interface state and then realize surface modification, which is beneficial to the effective bonding of the deposition layer formed by the subsequent ion exchange deposition.

Provided is a joint of a copper terminal and an aluminium conductor. A copper terminal connecting member of the joint is connected to a conductive core of the aluminium conductor by means of a transition welding layer, and the joint can also be provided with a reinforcing welding layer. Further provided is a method for preparing the joint using plasma arc welding. According to the invention, the connection portion of the copper terminal with the aluminium conductor is filled with solder in a plasma arc welding manner, such that copper and aluminium are connected by means of the solder. Damage to an aluminium oxide layer during welding increases the conductivity and can also isolate the copper terminal and the aluminium conductor, thus preventing an electrochemical reaction between the copper and the aluminium, prolonging the service life of the joint of the copper terminal and the aluminium conductor, and ensuring the mechanical and electrical performances of the connection structure.

This invention relates to the field of hot extrusion manufacturing technology, specifically to a high-strength weldable 6xxx series aluminum alloy profile, its manufacturing method, and its application. The aluminum alloy profile is composed of the following weight percentages: Si: 0.80%~1.2%, Fe≤0.20%, Cu: 0.40%~0.80%, Mn: 0.30%~0.70%, Mg: 0.70%~1.1%, Cr≤0.25%, Zn≤0.10%, Ti≤0.10%, Zr: 0.05%-0.20%, Pb<0.01%, with the balance being Al and unavoidable impurities. The profile meets the following performance requirements: tensile properties, R... m ≥420MPa, R p0.2 ≥330MPa, A 50mm ≥8.0%; Fatigue performance: at r=0.1, N=1×10 7 Under the same conditions, the fatigue strength σ of the smooth sample is ≥145MPa, realizing the lightweight manufacturing of high-speed trains.

The application provides a display panel and an electronic device. The electronic device comprises the display panel. The display panel comprises a substrate and a composite metal film layer. The composite metal film layer comprises a blocking layer and a main body layer which are stacked. By reducing the potential difference between the main body layer and the blocking layer in the composite metal film layer, the gap between the main body layer and the blocking layer is reduced, the hollowing of the blocking layer in the composite metal film layer is improved, the problems of line defects or black screen of the display panel are avoided, and the yield of the display panel is improved.

The invention discloses an ultrahigh-strength and high-toughness 7-series aluminum alloy for an automobile anti-collision beam and a preparation method of the ultrahigh-strength and high-toughness 7-series aluminum alloy, and belongs to the field of aluminum alloy materials. The components of the 7-series aluminum alloy are optimized, the contents of main elements Zn, Mg and Cu are controlled within the optimal range, Zn / Mg is accurately limited to be larger than or equal to 3 and smaller than or equal to 4.5, Zn-3Mg-Cu is accurately limited to be larger than or equal to 0.5 and smaller than or equal to 2.1, it can be effectively guaranteed that a strengthening phase is separated out in a better strengthening and toughening form, size and density, the grain refining effect of a refiner is matched, the obtained 7-series aluminum alloy has high strength and high toughness, the tensile strength can reach 540 MPa or above, and the tensile strength can reach 540 MPa or above. The yield strength can reach 520 MPa or above, meanwhile, the ductility is kept at 14% or above, and the practical requirements for high strength and high toughness of the automobile anti-collision beam in collision are met. In addition, through three-stage homogenization treatment, a product with excellent strength, toughness and corrosion resistance is promoted to be obtained, so that the use requirements of the automobile anti-collision beam are met.

The utility model discloses a U-shaped multi-stage grounding ESD (Electro-Static Discharge) anti-static wrist strap connector, which comprises an ESD equipment host (1), the ESD equipment host (1) is provided with at least one plug-in ESD wrist strap connecting wire (7), and the ESD wrist strap connecting wire (7) is provided with a U-shaped connector (2); the ESD equipment host (1) is provided with a U-shaped notch (3), and the U-shaped connector is arranged in the U-shaped notch (3). The connector provided by the utility model adopts an embedded design, and the U-shaped connector is embedded into the U-shaped notch of the ESD equipment host, so that not only is the aesthetic property of the equipment improved, but also the grounding reliability and the use safety are remarkably improved through a multi-stage grounding design and an anti-falling structure.

This invention relates to the field of relay protection technology, specifically an intelligent disconnect switch, comprising a base, a connector, a telescopic rod, and at least one disconnect switch. The disconnect switch is mounted on the top surface of the base, the connector is fixedly connected to the blades of all disconnect switches, one end of the telescopic rod is hinged to the top of the base, and the other end of the telescopic rod is hinged to the connector. A shielding box and a telescopic rod actuator are provided inside the base, and an electrical control board is mounted in the shielding box. The first and second detection terminals of the electrical control board are respectively connected to a voltage transformer and a current transformer on the power grid side via wires. The control terminal of the electrical control board is electrically connected to the telescopic rod actuator via wires, and the telescopic rod actuator and the telescopic rod are connected in a transmission manner. When the electrical control board detects an overvoltage or overcurrent signal, it drives the telescopic rod to retract through the telescopic rod actuator, causing the disconnect switch to open. The base and the shielding box are equipotentially connected, and the base is grounded. This invention solves the problems of the size of the intelligent disconnect switch and insufficient EMI immunity.

The utility model discloses a shielding structure, an electric connector and a connector assembly, which belong to the field of electric connectors, the shielding structure is used for shielding the electric connector and comprises a metal shell, a first grounding piece and a second grounding piece, and the first grounding piece and the second grounding piece are respectively arranged on two sides of a cable of the electric connector. The first grounding piece and the second grounding piece are electrically connected with a shielding layer of a cable of the electric connector, the first grounding piece is electrically connected with a grounding terminal of the electric connector, the first grounding piece is provided with an extending part, and the extending part is electrically connected with the metal shell. According to the shielding structure, the electric connector and the connector assembly provided by the utility model, the extension part is additionally arranged at the first grounding piece, so that stable connection between the first grounding piece and the metal shell can be effectively ensured. Furthermore, stable conduction among the grounding terminal, the coaxial line shielding layer connected with the signal terminal and the metal shell is achieved. The electromagnetic interference shielding effectiveness of the metal shell can be fully exerted, and the problem that wires are scalded possibly in a traditional mode is avoided.

This utility model belongs to the field of EMC grounding structure, specifically disclosing an EMC grounding terminal and its components. The EMC grounding terminal includes a grounding conductor and a connecting block for interference fit on the inner wall of a conductive housing. The grounding conductor has pins for conductive connection to a circuit board, and the connecting block has a protrusion. The grounding conductor passes through the protrusion and is connected to the connecting block. The inner edge of the grounding conductor has several first deformation portions, which are interference fit with the outer peripheral surface of the protrusion. The outer edge of the grounding conductor has several second deformation portions for interference fit with the inner wall of the conductive housing. The EMC grounding assembly includes a conductive housing, a circuit board, and the aforementioned EMC grounding terminal. This solution can achieve a grounding terminal that reduces space occupation, ensures connection strength, and obtains good EMC performance.

The invention belongs to the technical field of energy storage, and particularly relates to a cascade type energy storage battery cabin which comprises a container type cabin body and a plurality of cascade type energy storage modules arranged in the container type cabin body side by side. The cascaded energy storage module comprises a frame body, two battery clusters and two energy storage converters, the two battery clusters and the two energy storage converters are arranged on the frame body, the two battery clusters are distributed up and down, the interface ends of the two battery clusters face opposite directions, the two energy storage converters are oppositely arranged between the two battery clusters, the interface ends of the two energy storage converters face outwards and are electrically connected with the two battery clusters respectively, and the two energy storage converters are connected in series; and the plurality of cascaded energy storage modules are connected in series in sequence through the energy storage converter, so that the voltage is increased step by step. The cascaded energy storage modules are uniformly placed, the upper battery clusters and the lower battery clusters are aligned, the upper battery clusters and the lower battery clusters face opposite directions, and the energy storage converters and the corresponding battery clusters face the same direction, so that the height of the whole cabin can be reduced, the energy density is improved, and the risk of ultrahigh transportation is reduced; and the potential difference between the adjacent battery clusters is small, so that the operation safety of equipment is ensured.

The invention discloses a dynamic parallel control method, device and system for a multi-branch battery system. The dynamic parallel control method for the multi-branch battery system comprises the following steps: acquiring terminal voltage and current of each battery branch to be connected in parallel; on the basis of the equivalent circuit model of each battery branch, slowly-varying voltage of each battery branch is calculated according to the terminal voltage and the current, and the slowly-varying voltage is the sum of the terminal voltage and ohm internal resistance partial voltage; and according to a preset working condition, controlling the battery branches to be connected into the main loop in sequence based on the slowly-changing voltage. According to the invention, parallel control can be carried out on the multi-branch batteries more accurately in a manner of adapting to dynamic working conditions, ring current among the branches is reduced, the service life of the battery system is prolonged, and the shutdown time of the battery system is reduced.