8 results about "Cathode spots" patented technology

The invention relates to the technical field of batteries, in particular to a copper foil and a preparation method thereof, a current collector, a pole piece and an energy storage device. A connection degree gamma exists between the surface density of the copper foil and the size and arrangement of the through holes, the formula of the connection degree gamma is # imgabs0 #, and the value range of gamma is 1 + / -0.1; the copper foil is prepared through an electrolytic method, and an insulating acid-resistant coating is dispensed on the surface of a cathode of the electrolytic method to form an insulating acid-resistant layer; according to the electrolytic method, an active layer is formed on the surface of an anode by coating a mixed active substance solution and sintering, an inert substance is coated on the surface of the active layer opposite to a point coating position of a cathode to form an inert layer, and the range of the inert layer is smaller than 70% of the area of a pore region. The porous copper foil prepared by the method has a porous structure, the pore size distribution is more uniform, the size is consistent, meanwhile, the parts except the pores are dense copper layers, and the mechanical property of the material is good.

The invention provides a solid tungsten electrode negative pressure arc plasma beam cleaning machining method. The method comprises the steps of adjusting technological parameters, forming negative pressure arc plasma beam rotary adsorption cleaning, negative pressure arc fixed-point cleaning and online monitoring and adjusting. Through the steps, different cleaning parameters are selected according to different cleaning materials, and dynamic anti-gravity, upward negative pressure and an influence area thereof are formed in an electric arc action area by utilizing a magnetic field through the synergistic effect of negative pressure electric arc plasma beam rotary adsorption cleaning and electric arc cleaning technology for regulating and controlling magnetic field threshold constraint; and the oxidation film or pollutants are directionally stripped and upwards migrated to a collecting device, so that the removal is achieved, and meanwhile, high-energy fixed-point cleaning of arc cathode spots is combined, so that high-efficiency, high-precision and wider-cleaning-range surface cleaning treatment is realized.

The present invention discloses a laser-arc composite cleaning method for aluminum alloy oxide films, which relates to the field of aluminum alloy welding / additive manufacturing technology. The method first uses laser cleaning to remove the oxide film of uniform depth on the surface of the parent material / workpiece. Since the thickness of the surface oxide film / stains varies, the residual oxide film on the surface after laser cleaning will be distributed in the form of scattered points. This is followed by arc cathode cleaning, at which time the cathode spots will automatically search for the residual oxide film to achieve fixed-point cleaning of the oxide film. The present invention can remove the oxide film on the surface of the aluminum alloy to the greatest extent, the cleaning area can be freely adjusted, and will not cause obvious adverse effects on the parent material structure. It can be welded as soon as cleaning is completed, effectively preventing the regeneration of the oxide film, and significantly improving work efficiency.

The invention relates to the technical field of metallurgy, discloses a direct-current power supply arc stability control method based on a submerged arc furnace, and solves the problems of logic limitation and insufficient matching in the prior art. The instantaneous value and the change rate of the arc resistance are calculated by collecting arc voltage, arc current and electrode position signals in real time; constructing a cathode spot drift feature recognition model, and extracting a high-frequency fluctuation component of 10kHz-100kHz in the instantaneous value of the resistance to be matched with a preset feature spectrum so as to recognize a drift state; voltage and current compensation values are generated by adopting a model prediction control algorithm introducing a drift coefficient, and output parameters of the direct-current power supply are cooperatively adjusted and controlled in combination with multiple dimensions. The control method provided by the invention can accurately capture and inhibit the specific cathode spot drift of the direct current arc, reduce the arc fluctuation and arc breaking phenomena, improve the smelting stability, and reduce the invalid energy consumption and electrode loss, and is suitable for the arc stability control of the direct current power supply of the submerged arc furnace.

The present application relates to a layered cathode structure based on the alternative distribution of functional layers-buffer layers and its rapid trial method, belongs to the field of mechanical processing technology, and relates to a layered cathode structure comprising a functional structure surface layer and a matrix, wherein the functional structure surface layer is further composed of a plurality of sub-functional layers and buffer layers stacked and arranged alternately. In actual service, the functional layer made of thermo-chemical materials generates refractory oxide layer in situ to complete self-protection and emit electron support arc discharge; the buffer layer is made of nanocrystalline material with high plastic deformation ability, which can not only release the thermal stress of the functional layer by its own moderate deformation, but also accelerate the migration of the cathode spot to slow down the cathode burning loss when contacting the cathode arc. By utilizing the synergistic effect of the functional layer and the buffer layer, the cracking, splitting and coating peeling problems caused by plasma discharge rapid heating and rapid cooling in the application scenarios such as hole drilling by electric spark machining and arc welding of the layered cathode are solved, and the ablation uniformity is improved and the ablation rate is reduced.

This invention relates to the field of plasma numerical simulation technology, and particularly to a method for improving the simulation accuracy of multi-cathode spot jets in vacuum arcs. The technical solution includes the following steps: model construction, building a three-dimensional particle-fluid hybrid simulation model, which includes an ion particle mesh module, an electron fluid module, and an electromagnetic field solution module; time iteration, employing a predictor-corrector algorithm to construct a self-consistent time-domain propagation process, wherein, within a time step, based on the particle information and electromagnetic field information at the current moment, a half-time step propagation of the magnetic field is executed sequentially. This invention achieves efficient, accurate, and stable three-dimensional simulation of multi-cathode spot jet processes in vacuum arcs while ensuring high physical fidelity, significantly reducing computational costs, improving iteration accuracy and computational efficiency, and providing a standardized basis for parameter selection.

The present invention belongs to the technical field of power systems and discloses a high-frequency series arc modeling method, comprising: analyzing a DC circuit and calculating the cathode spot electron current density of the DC circuit; calculating the radius statistical value parameters of the cathode half-point area based on the arc current amplitude; and calculating the radius change sequence of the radius changing with time based on the radius statistical value parameters; calculating the discharge area area sequence based on the radius change sequence; and calculating the arc current sequence based on the discharge area area sequence and the cathode spot electron current density; and modeling the DC series arc based on the arc current sequence. Based on the dynamic characteristics of electrons, the present invention takes the dynamic change process of the cathode spot into account, and uses the change in the cathode spot radius size to simulate the dynamic change process of the cathode spot, thereby modeling the high-frequency series arc. This method can overcome the defect that traditional arc models cannot represent high-frequency noise components, and has the advantages of simple calculation and high modeling accuracy.

This invention discloses a copper-chromium-tellurium alloy strip, comprising Cr, Te, P, Cu, and unavoidable impurities, with the sum of the mass percentages of all elements being 100%, wherein Cr: 0.05~0.50 wt%, Te: 0.05~0.50 wt%, and P: 0.001~0.020 wt%. The copper-chromium-tellurium alloy strip comprises a matrix and a second phase, the second phase being a chromium-tellurium intermetallic compound with an average size of 0.5~3.0 μm. This invention, by controlling the Cr and Te content and the size of the chromium-tellurium intermetallic compound, alters the distribution of cathode spots under arc erosion, thereby improving the arc erosion resistance of the copper-chromium-tellurium alloy, making the copper-chromium-tellurium alloy strip suitable for preparing vacuum switch contact materials.