16results about How to "Low conductivity" patented technology

The application relates to a silicon-carbon composite material and a preparation method thereof, a negative active material, a negative electrode sheet, a secondary battery and an electric device. The silicon-carbon composite material comprises porous carbon and a zinc silicate-silicon-oxygen-carbon composite material; at least part of the zinc silicate-silicon-oxygen-carbon composite material is filled in the pores of the porous carbon; the zinc silicate-silicon-oxygen-carbon composite material is of a porous structure; the pore diameter of the zinc silicate-silicon-oxygen-carbon composite material is 1-5 nm; and the mass content of zinc elements in the zinc silicate-silicon-oxygen-carbon composite material is 1-6%. The zinc silicate-silicon-oxygen-carbon composite material has proper pore diameter and zinc element content, is good in structural stability, and has low volume expansion rate and good conductivity. Since part of the zinc silicate-silicon-oxygen-carbon composite material is filled in the pores of the porous carbon, the volume expansion of the silicon-carbon composite material is further buffered. In the electrochemical cycle process, the silicon-carbon composite material has low volume expansion, and the cycle stability of the secondary battery can be improved.

A fast-response temperature and humidity sensor includes a humidity-sensitive material, a cylindrical frame disk, a temperature sensor, and an MCU with on-chip ROM. The frame disk has multiple deep-groove air channels evenly distributed around its perimeter. The frame disk has a socket for fixing the temperature sensor, which is electrically connected to the microcontroller. The temperature sensor measures the ambient temperature around the temperature and humidity sensor, and the MCU performs temperature correction on the humidity measurement value. The MCU's on-chip ROM stores a standard database containing multiple humidity-sensitive resistance (R)-humidity (H) curves of the fast-response temperature and humidity sensor at different temperatures (T). Based on the measured temperature value (T) and resistance value (R), the MCU looks up the corresponding humidity value (H) in the standard database.

The present application relates to the technical field of new energy vehicles, in particular to a vehicle low-voltage power supply system and an electric vehicle. The present application comprises a storage battery and a DC / DC, one end of the DC / DC is used for connecting a power battery, the other end is connected with the storage battery and a low-voltage load, and is used for charging the storage battery and supplying power to the low-voltage load. The storage battery is connected with emergency loads and 24-hour constant power equipment through a low-voltage power supply circuit. If the power battery and the DC / DC are normal, the DC / DC converts high-voltage direct current of the power battery into low-voltage direct current to supply power to the low-voltage load. If the power battery or the DC / DC fails, the storage battery supplies power to the emergency loads and the 24-hour constant power equipment. The present application not only ensures normal power supply to the emergency loads and the 24-hour constant power equipment of the vehicle, guarantees the stability and reliability of the low-voltage power supply of the vehicle, but also has low system cost and simple structure.

The invention discloses a power insulator with a protection structure at the edge, and the power insulator comprises a plurality of groups of ceramic insulators, the outer end of each ceramic insulator is provided with a protection assembly, and the center of each ceramic insulator is provided with a slot. An upper resin rod and a lower resin rod are respectively inserted into the slots at the two ends of the plurality of groups of ceramic insulators, a middle resin rod is inserted into the slot between the upper resin rod and the lower resin rod, fixed seats are fixedly mounted at the separated ends of the upper resin rod and the lower resin rod, and a fastening assembly is arranged on one side of each fixed seat. The flashover phenomenon of discharge breakdown occurs between the adjacent ceramic insulators, the protection assembly can effectively protect the edges of the ceramic insulators, damage caused by overlarge stress at the edges is avoided, the sunken sealing grooves and the umbrella-shaped faces of the ceramic insulators form transitional umbrella skirt-shaped cambered surfaces after being matched with the upper sheath, and therefore the sealing effect of the ceramic insulators is improved. Therefore, water drops cannot gather on the surface and can quickly flow away to reduce the conductivity, and the safety is improved.

A combined drive / brake unit (100) integrated into the rim (111) of a wheel (112) includes an axial flux motor (118) and an eddy current brake (120), wherein a common rotor (106) is provided for the axial flux motor (118) and the eddy current brake (120).

The application discloses a preparation method of a silver tin oxide electric contact material with good plasticity and arc erosion resistance, and comprises the following steps: first, taking Ag ingot, Sn ingot and X ingot of an additive element to prepare Ag-Sn alloy powder with a required particle size; the obtained powder is oxidized to obtain AgSnO2 mother powder; then, the required amounts of Ag, Sn and X elements are calculated according to the component proportion of the required preparation material, and are weighed for standby, wherein the Sn and X elements are weighed in the form of AgSnO2 mother powder, and the Ag element is weighed in the form of silver nitrate and AgSnO2 mother powder; then, an alkaline substance in excess of silver nitrate is weighed, and the alkaline substance and the silver nitrate are respectively prepared into solutions; then, the weighed AgSnO2 mother powder is added into the alkaline solution, and the silver nitrate solution is continuously added for reaction to obtain AgSnO2 powder; and finally, the obtained powder is prepared into a silver tin oxide electric contact through a conventional process. The contact prepared by adopting the method has good plasticity and arc erosion resistance.

The invention provides a static contact assembly of a relay, a contact assembly and the relay. The static contact assembly comprises a conductive piece and a connecting piece. The conductive part comprises a first surface and a second surface, the first surface is provided with a static contact, the static contact is located at the end of the conductive part in the first direction, and the first direction is the length direction of the static contact assembly. The connecting piece is connected to the second surface of the conductive piece and extends in the direction away from the conductive piece along the first direction of the conductive piece. Wherein the connecting piece and the conductive piece are made of different materials, and the connecting piece and the conductive piece are connected at the static contact.

The application discloses a preparation method of a copper-cobalt-doped carbon nitride electrocatalyst, and a product and application thereof. The copper-cobalt-doped carbon nitride electrocatalyst is prepared by taking 3-amino-1,2,4-triazole as a precursor, 1,10-phenanthroline as a ligand, and a copper source and a cobalt source as metal sources, and has a C3N5 carrier and Cu / Co dispersed in the carrier. The catalyst has rich active sites and excellent conductivity, and through the synergistic effect of copper and cobalt, the hydrogen evolution side reaction is inhibited, and the activity, selectivity and stability of the electrocatalytic reduction of nitrate to produce ammonia are improved. The problems of low activity, low faradic efficiency, poor stability and high cost of the existing electrocatalytic nitrate reduction ammonia catalyst are effectively solved. The preparation method adopts a non-noble metal + non-metal substrate, raw materials are easy to obtain, the preparation process is simple, and the cost is low, and thus the method can realize large-scale production. The obtained catalyst is suitable for the field of electrocatalytic reduction of nitrate to produce ammonia, can realize water nitrate pollutant treatment and high-value ammonia resource recycling, and has dual benefits of environmental protection and economy.

The utility model discloses a corrosion-resistant electric power fitting based on a graphene coating, comprising two bearing frames, the two adjacent bearing frames are mutually spliced, the upper end of the bearing frame is hinged with a cover plate, one end of the cover plate and one end of the bearing frame are fixedly provided with a reinforcing structure, the bearing frame and the reinforcing mechanism are clamped and installed through two U-shaped installation rods, and the two U-shaped installation rods are fixedly connected with the bearing frame. A cushion layer is arranged in the bearing frame, and the bearing frame is composed of a base body pretreatment layer, a conductive transition layer and a gradient functional layer. The electric power fitting provided by the utility model has good corrosion resistance and mechanical strength, can effectively reduce the problems of mechanical strength reduction and conductivity degradation caused by corrosion and damage, is helpful for maintaining the stable fixation and good conductivity of the cable, reduces the resistance and electric energy loss in the electric power transmission process, and improves the service life of the cable. The power transmission efficiency and stability are improved, and a powerful guarantee is provided for safe and reliable operation of a power system.

The application provides an air atmosphere near-infrared laser sinterable oxidation-resistant copper paste and a preparation method thereof, and the main body of the paste is Cu@glass, which comprises a copper core, and a Bi2O3-B2O3-ZnO glass shell layer with a mass fraction of 5%-20% coated outside the copper core, and the particle size of the copper core is 200 nm-500 nm. The copper paste prepared by using the Cu@glass material greatly improves the near-infrared laser absorption efficiency and oxidation resistance of the Cu@glass particles under the coating structure of the glass shell, and the initial oxidation temperature and the near-infrared light absorption rate of the 10% glass-coated Cu@glass particles are 294 DEG C and 61.8% respectively, so that the stable necking and densification of the copper paste under the irradiation of the near-infrared laser are realized under the condition of the air atmosphere, and a copper conductor film layer with conductivity is obtained.

The utility model belongs to the technical field of welding equipment, and discloses induction thermocompression welding equipment for aluminum-clad steel wires, which comprises an induction coil, the induction coil is of a copper hollow structure, the inner diameter of the induction coil is 20-100mm, and the induction coil surrounds the outside of a welding area; the fixing mechanism comprises a welding clamp, the welding clamp comprises a left die and a right die which are symmetrically arranged, and the left die and the right die clamp the two ends of the steel wire correspondingly; the hydraulic device comprises a liquid transmission rod and a hydraulic control unit connected with the liquid transmission rod, and the hydraulic device drives the left mold and the right mold to move through the liquid transmission rod; and the shielding gas supply unit conveys argon to the welding area through the annular nozzle. Through the synergistic effect of segmented current regulation and control and a closed-loop hydraulic mechanism, multi-parameter collaborative optimization of heating temperature, pressure and displacement can be achieved, meanwhile, the problems that heat source control is insufficient and positioning precision is poor can be solved, and welding consistency is improved.

The invention is applicable to the field of current collection circuits, and provides 35KV current collection circuit wiring equipment, which comprises a cable and a T-shaped wire clamp, the cable comprises a main core wire and a branch core wire, the branch core wire is vertically mounted below the main core wire, and the T-shaped wire clamp comprises a top cover, two bottom plates, two clamping plates, a plurality of U-shaped bolts and a plurality of nuts. The two clamping plates are oppositely installed on the outer side of the branch core wire, a first base plate and a second base plate are arranged on the outer sides of the two clamping plates respectively, and a plurality of springs are installed on the side faces of the first base plate and the second base plate. The first base plate and the second base plate are matched based on the movably-arranged clamping plates, and the first base plate and the second base plate are extruded through U-shaped bolts and nuts; according to the utility model, the clamping plate is arranged, the branch core wire is fixed by extruding the clamping plate through the arranged spring, the arranged spring can play a role in buffering and looseness prevention, the branch core wire which is vertically installed is prevented from falling off, meanwhile, the branch core wire can be prevented from being installed too tightly, the branch core wire or the T-shaped wire clamp is prevented from being damaged, and the influence on the conductive performance is reduced.

The invention discloses a method for extracting vanadium from stone coal and a method for fully recycling stone coal, and the method for extracting vanadium from stone coal comprises the following steps: adding a mixture of stone coal, a slag former and a reducing agent into an electrothermal furnace, heating by using an electrode, and melting and reducing in the electrothermal furnace to obtain molten phosphorus-vanadium iron; the smelting temperature in the electric heating furnace ranges from 1450 DEG C to 1700 DEG C; the value of CaO / SiO2 in the mixture is 0.1 to 1.5. According to the method, the defects of long flow and low vanadium recovery rate of a roasting technology and a wet process technology adopted in the prior art are overcome; the method has the effects of improving the recovery rate of vanadium and phosphorus and improving the treatment efficiency of the stone coal, can effectively realize full-resource utilization of the stone coal, and does not produce other solid wastes.

The application relates to a preparation method of copper powder with adjustable particle size, a certain amount of copper sulfate and functionalized ionic liquid are weighed and added into a certain volume of solvent I, stirring and dissolving to obtain solution A; a certain amount of a reducing agent is weighed and added into a certain volume of solvent II, stirring and dissolving to obtain solution B; solution A and solution B are mixed and stirred at a temperature of 70-90 DEG C for 2h; then centrifugal separation, washing and vacuum drying are carried out to obtain copper powder; the solvent I and the solvent II are the same and can be selected from one or more of distilled water, ethylene glycol, propylene glycol and glycerol. The application has the advantages of simple process, green environmental protection and easy amplification; the carboxyl functionalized ionic liquid is adopted, the oxidation resistance of the copper powder is improved; the particle size of the copper powder can be adjusted within 200nm to 5.2mu m by changing the type, concentration and reaction temperature of the ionic liquid, the prepared copper powder has uniform particle size distribution, good dispersity, high crystallinity, good conductivity and good oxidation resistance.

A method for forming a semiconductor structure includes: removing an initial dielectric layer in a second region, forming a first opening in the initial dielectric layer; filling a limiting dielectric layer in the first opening, the limiting dielectric layer having an etching selectivity ratio between a material of the limiting dielectric layer and a material of the initial dielectric layer; removing a remaining initial dielectric layer in a first region by using an isotropic etching process, forming a second opening, the second opening including an interconnection groove in the limiting dielectric layer and exposing a source / drain doped region, and a conductive via in an isolation layer and exposing a power supply rail, the conductive via being located at a bottom of the interconnection groove and communicating with the interconnection groove; and filling the conductive via and the interconnection groove, forming a conductive plug in the conductive via and a source / drain interconnection layer in the interconnection groove, the conductive plug being in contact with the power supply rail and the source / drain interconnection layer, respectively. The embodiment of the present application reduces a contact resistance between the conductive plug and the power supply rail and a resistance of the conductive plug.

The invention belongs to the technical field of grinding of grinding tools, and discloses a brittle corrosion-resistant metallic bond, a metallic bond superhard grinding wheel and a preparation method of the metallic bond superhard grinding wheel. The brittle corrosion-resistant metal bonding agent prepared by the invention comprises the following raw materials in parts by weight: 50-70 parts of copper powder, 5-20 parts of tin powder, 5-15 parts of graphite powder and 15-20 parts of an improvement additive. Graphite powder and an improvement additive are added into a traditional bronze-based metal binding agent, secondary heat treatment is carried out, the plasticity of the binding agent is reduced, the brittleness and hardness of the binding agent are improved, brittle fracture can occur in time, and the workpiece quality cannot be affected; through secondary heat treatment, elements in the improvement additive form a uniform and compact protective film on the grinding wheel, internal metal can be continuously prevented from being corroded in the whole life cycle of the grinding wheel, and the thickness consistency problem caused by corrosion of the side face in the using process of the grinding wheel is solved. The brittleness and corrosion resistance of the bronze-based metal bonding agent are improved on the premise that the cost is not obviously increased.