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159 results about "Electrode corrosion" patented technology

Electrode for in-situ electrical measurement for diamond anvil cell and method for producing the same

The invention discloses an in-situ electrical measuring electrode that is used in diamond-pair anvil cells and a manufacturing method thereof, and belongs to the technical field of high-temperature and high-voltage devices. Four electrodes (1) are deposited on the surface of a diamond anvil cell (8) and distribute from an anvil surface to a lateral surface of the diamond anvil cell (8); the electrodes (1) are diamond films doped with boron; a diamond insulating layer (2) covers the anvil surface and the lateral surface of the diamond anvil cell (8) as well as the electrodes (1) thereof; the electrodes (1) are exposed at one end of the anvil surface, the exposed position lies inside a sample cavity (9), and the electrodes (1) are exposed at one end of the lateral surface and connected with an electrode lead (5). A diamond film microcircuit and the diamond insulating layer are simultaneously integrated onto the surface of the diamond anvil cell by utilizing the film deposition technique, the nanometer seeding technique, the masking technique and the photolithographic method. The manufacturing method of the in-situ electrical measuring electrode prevents the electrode from being destroyed by transverse shearing force and overcomes the electrode corrosion by samples under the high-voltage condition, thus widening the research field of electrical in-situ measurement under high voltage.
Owner:JILIN UNIV

Lithium-sulfur battery containing barrier layer

The invention relates to a lithium-sulfur battery containing a barrier layer, and belongs to the field of electrochemical batteries. The surface of the positive electrode of a conventional lithium-sulfur battery is coated with a bacterial cellulose derived carbon fiber barrier layer, so that the dissolution, shuttling and battery negative electrode corrosion of polysulfide in an electrolyte solution of the lithium-sulfur battery during charging / discharging are inhibited. According to the lithium-sulfur battery containing the barrier layer, a carbon material is directly pressed on the surface of a membrane by utilizing external pressure through using an ultra-filtration cup, and the membrane is directly used after being dried without the need for stripping the carbon-containing barrier layer, so that the material waste is avoided and the effectiveness and completeness of the barrier layer are ensured. The bacterial cellulose derived carbon fiber barrier layer improves the conductive problem of sulfur as an active substance of the positive electrode of the lithium-sulfur battery, and the three-dimensional space structure of carbon fibers also provides a buffer space for volume expansion during charging / discharging, so that the electrode collapse is prevented and the electrochemical performance of the lithium-sulfur battery is improved. Under the current density of 0.5C, the initial discharge specific capacity of the battery is 1,823.2mAh / g, and the specific discharge capacity of the battery after being cycled for 100 times is 939.4mAh / g.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Helicon plasma induction thruster

The invention discloses a helicon plasma induction thruster. The helicon plasma induction thruster comprises a discharge cavity, and first magnets and second magnets are sequentially arranged on the outer portion of the discharge cavity; a helicon discharge antenna and an induction acceleration coil are sequentially arranged on the outer wall of the discharge cavity in the axial direction; and the thruster further comprises a helicon discharge circuit, a pulse induction discharge circuit and a time sequence control circuit, wherein the helicon discharge circuit provides a work power source for the helicon discharge antenna. The pulse induction discharge circuit is connected with the induction acceleration coil and provides a pulse discharge voltage for the induction acceleration coil so as to drive helicon plasmas to be pushed out in an accelerated manner, and the time sequence control circuit is connected with the helicon discharge circuit and the pulse induction discharge circuit. The helicon plasma induction thruster has the beneficial effects of being free of electrode corrosion, large in ionization density and long in service life. Through efficient decoupling of the ionization level and the acceleration level, efficient separation of the ionization level and the acceleration level is achieved, voltage needed by a capacitor of the acceleration level is reduced, the system size and the system weight are greatly reduced, and miniaturization, lightweight and the solid state of the thruster are facilitated.
Owner:NAT UNIV OF DEFENSE TECH

Monitoring device and monitoring method for simulating welding joint corrosion in stress state

ActiveCN107505256AMonitoring for localized corrosion problemsSimulate the realWeather/light/corrosion resistanceAuxiliary electrodeEngineering
The invention relates to a monitoring device and a monitoring method for simulating welding joint corrosion in a stress state. The device comprises a four-point bending augmentor, a zero resistance galvanometer, an electrochemical workstation, a welding resistance-multi-electrode corrosion sensor, a reference electrode, an auxiliary electrode, a microhmmeter and a signal acquisition control system, wherein the welding resistance-multi-electrode corrosion sensor comprises a corrosion element and a reference element; the corrosion element is adapted with a relay switch, and is coupled by the zero resistance galvanometer; the electrode element is connected to the microhmmeter; the stress level of the four-point bending augmentor is changed by adjusting the deflection of a long-strip electrode specimen; the signal acquisition control system is used for acquiring and storing data measured by the zero resistance galvanometer and the microhmmeter, and controlling the action of the relay switch. The monitoring device and the monitoring method disclosed by the invention have the advantages that the corrosion condition of a welding joint area of a pipeline can be comprehensively and accurately monitored, and the total corrosion depth and the corrosion rate of the welding joint area and the electrochemical corrosion rate are measured; in addition, the cathode and anode current in different regions of the welding joint is monitored, and the stress condition of a welding joint node is simulated.
Owner:DALIAN UNIV OF TECH

Efficient long-service-life stranded electrode wire for EDM wire

ActiveCN103990877AImprove cutting efficiencyHigh-speed reciprocating wire EDM and low cutting efficiencyElectrical-based machining electrodesCooling effectElectrical and Electronics engineering
An efficient long-service-life stranded electrode wire for an EDM wire is characterized by being formed by stranding at least two electrode wire bodies. Concave cavity grooves and convex discharging joint points are formed on the surfaces of the stranded electrode wire bodies. The concave cavity grooves are not only containing spaces for a working solution but also discharging spaces for inter-electrode corrosion removal products. In addition, feeding of the working solution and the discharging of the corrosion removal products are respectively performed in a spiral mode, and then the inter-electrode cooling effect and the deionization ability are improved. The discharging joint points can form regular discharging, and a discharging pulse interval can be indirectly prolonged. As the surfaces of the electrode wire bodies are provided with the concave parts which serve as the chip containing spaces, the working solution can be fed into inter-electrode in a promoted mode; meanwhile the discharging of the inter-electrode corrosion removal products is accelerated, so that the inter-electrode discharging conditions are improved; due to the regular convex points on the surfaces of the stranded electrode wire bodies, the discharging rule is easier to control. Accordingly, machining efficiency can be enhanced, and surface quality can be improved. Besides, the volume of the chip containing spaces of the stranded electrode wire bodies can be controlled according to the diameter of the electrode wire bodies and the pitch of the stranded wire bodies.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Vacuum pre-loading combined electric process test apparatus and test method thereof

The invention relates to a vacuum pre-loading combined electric process test apparatus and a test method thereof, and belongs to the field of geotechnical engineering foundation treatment. The apparatus comprises a power supply part, a vacuum pump part and a box body part. The box body part is a transparent toughened glass box, soil in the box body is coated with a sand cushion, and the front side of the box body is provided with equidistant electric potential monitoring point hole sites. Cylindrical hollow graphite rods are inserted to two sides of the box body as a cathode and an anode, and the anode is a salt solution injection channel. A plastic water draining plate is inserted to a position close to the cathode, the top end of the water draining plate is positioned in the sand cushion and is connected with a conical flask through a rubber tube, and a vacuum pump is connected with the conical flask through the rubber tube. The invention also provides a method for carrying out vacuum pre-loading combined electric process test by using the apparatus. The apparatus can simulate vacuum pre-loading combined electric process soft soil reinforcement indoors, can guarantee test sealing and prevent electrode corrosion, and can be used to accurately measure the water draining effect, the settlement consolidating effect and the vacuum pre-loading combined electric process energy consumption ratio of soil.
Owner:SUN YAT SEN UNIV
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