13 results about "Electrospark deposition" patented technology

The invention belongs to the technical field of metal surface engineering, and relates to an electric spark deposition preparation method of a W-MoS2 self-lubricating coating and application of the W-MoS2 self-lubricating coating in steel part surface strengthening. According to the method, steel is used as a matrix material, a composite electrode prepared by sintering tungsten powder and molybdenum disulfide powder is adopted, and the W-MoS2 self-lubricating coating with excellent tribological performance is prepared on the surface of a steel matrix by controlling parameters of an electric spark deposition process. The coating and a steel substrate form a good metallurgical bonding interface. A hard phase W in the coating provides excellent bearing capacity, a lubricating phase MoS2 forms a continuous lubricating film in the friction process, and a new phase (such as Mo, WS2 and the like) generated by a high-temperature decomposition reaction of MoS2 in the electric spark deposition process synergistically enhances the antifriction and wear resistance of the coating, the friction coefficient and the wear loss are remarkably reduced compared with a steel matrix, and the wear resistance of the coating is greatly improved. The method is particularly suitable for strengthening the key friction pair surface of high-end mechanical equipment in the modern industrial field and prolonging the service life of steel parts.

The present invention discloses a process for electrospark deposition of a composite coating on the surface of a crane bearing. The process comprises the following steps: sanding the crane bearing and electrode with sandpaper until the surface roughness of the crane bearing and electrode is no greater than 2 μm; ultrasonically cleaning the crane bearing and electrode in anhydrous ethanol at room temperature to remove surface grease and impurities, and then drying them at room temperature; electrospark deposition of a transition coating on the crane bearing using a silver electrode; and electrospark deposition of a surface coating on the crane bearing using a B83 electrode. The present invention utilizes an electrospark deposition process to deposit a composite coating of silver and B83 on the surface of the crane bearing. The crane bearing after composite coating deposition exhibits low friction, strong load-bearing capacity, excellent stability, and high reliability.

The invention relates to the field of preparation of a wear-resistant composite coating on the surface of a steel member, in particular to an electric spark secondary deposition preparation method of a CoCrFeNiAl high-entropy alloy composite coating containing a diamond infiltrated layer, which is applied to coating the surface of a steel part. Steel is adopted as a base material, a CoCrFeNiAl high-entropy alloy electrode and a high-purity graphite electrode which are formed by sintering cobalt powder, chromium powder, iron powder, nickel powder and aluminum powder in an equal molar ratio are adopted as electrodes for electric spark deposition, and the CoCrFeNiAl high-entropy alloy composite coating containing the diamond infiltrated layer is deposited on the surface of the steel base by adopting an electric spark deposition technology. The composite coating and the steel substrate are metallurgically bonded with strong bonding force, the diamond infiltrated layer can enhance the surface hardness of the coating and reduce the friction coefficient of the surface of the composite coating, so that the composite coating has better antifriction and wear-resistant effects, and the problem of surface wear of a steel member in a frictional wear environment is solved.

The application discloses a device and method for discharging additive and subtractive materials by planetary electrodes, and relates to the technical field of electric spark deposition, which comprises a shell, a bottom end of a stirring head in a semispherical shape, a feeding cavity arranged in the stirring head, a feeding port arranged at a bottom of a side wall of the stirring head, a feeding pipe arranged at a top end of the stirring head, a first driving mechanism for driving the stirring head to rotate, the stirring head penetrating through a planetary carrier, a gap being arranged between the planetary carrier and the stirring head, an axis of the stirring head being parallel to or coinciding with an axis of the planetary carrier, the planetary carrier being arranged in the shell and being rotationally matched with the shell through a bearing, a gas feeding cavity being arranged in the planetary carrier, an air filling pipe being arranged at a top end of the planetary carrier, a second driving mechanism for driving the planetary carrier to rotate, a plurality of rotary motors being fixedly connected with the planetary carrier, a gas feeding channel and a gas outlet being arranged in each rotary electrode, and an electrode ring being fixedly arranged on an inner wall of the shell. The application can improve the compactness of a coating.

The invention relates to an electric spark deposition repairing and polishing integrated device which comprises a repairing table and a support arranged above the repairing table, the surface of the support is in transmission connection with a moving frame, the surface of the moving frame is fixedly connected with an upper sealing plate, and an inner cavity of the upper sealing plate is provided with an electric spark machine head through a transmission mechanism. The two sides of the repairing table are slidably connected with sealing structures, wherein the sealing structures and the upper sealing plate form sealing pieces. The invention relates to the technical field of electric spark deposition repair. According to the electric spark deposition repairing and polishing integrated device, efficient and energy-saving inert gas management is achieved, a dynamic sealing cavity is matched with an intelligent air exhaust assembly, layered air exhaust is achieved through density difference, air is rapidly replaced, the positive pressure environment is maintained, the inert gas dissipation amount is reduced by 50% or above, meanwhile, the air injection amount of a machine head is reduced by 30%-40%, and cost is remarkably saved.

This invention relates to the field of additive manufacturing technology and discloses a fine-grained, low-stress electrical discharge-laser-ultrasound composite additive manufacturing method. The method comprises the following steps: performing electrical discharge deposition-laser remelting-ultrasound impact cyclic additive manufacturing on a metal substrate surface to obtain the additively manufactured component. The additively manufactured component prepared by this method exhibits a compressive stress state on its surface, which is beneficial for suppressing fatigue crack initiation and propagation, significantly improving the fatigue life and service reliability of the component. Furthermore, the additively manufactured component prepared by this method possesses significant fine-grained microstructure characteristics and achieves a synergistic improvement in strength, plasticity, and toughness.

The invention belongs to the technical field of surface engineering, and particularly relates to an electrode for electric spark deposition, application of the electrode, a wear-resistant coating and a preparation method and application of the wear-resistant coating. According to the electrode provided by the invention, the coating is prepared by adopting an electric spark deposition method, and the Mo element in the coating can improve the lubricating performance and reduce the friction coefficient between the coating and a metal mold; the rare earth elements in the coating can refine grains, so that the coating has good mechanical properties, good metallurgical bonding is formed between the coating and a matrix, and the hardness and the adhesive wear resistance of the coating are further improved. Furthermore, the invention also provides a preparation method of the wear-resistant coating, an ultrasonic process is applied in the deposition process, and ultrasonic impact is utilized to generate pressure stress, so that the deposited tensile stress is counteracted, the residual stress of the coating is eliminated, and the hardness and wear resistance of the coating are further improved. The wear-resistant coating is applied to the surface treatment of the rim mold, so that the service life of the mold can be further prolonged.

The invention relates to a method for repairing a metal anti-corrosion coating of an open rack liquefied natural gas gasifier, which comprises the following steps of: performing electric spark deposition on the metal anti-corrosion coating in a to-be-repaired area, so that the metal anti-corrosion coating is metallurgically bonded with a base body and covers the exposed base body, and the repairing of the metal anti-corrosion coating of the gasifier is completed. By means of the repairing method, the locally-falling metal coating can be quickly and efficiently repaired, metallurgical bonding of the repaired metal anti-corrosion coating and the base body is achieved, the bonding strength between the coating and the base body is improved, the service life of the overall anti-corrosion coating of the heat exchange part of the open-frame vaporizer is prolonged, the maintenance cost and time are reduced, and the service life of the open-frame vaporizer is prolonged. And the safe operation reliability of the equipment is improved.

The present invention discloses a grain boundary diffusion method of a light rare earth diffusion source based on electrospark deposition, which comprises the following steps: First, semi-densification sintering is carried out on magnetic powder to obtain a magnetic material substrate; secondly, with electrospark deposition as the coating means, a light rare earth-based alloy diffusion source is plated on the surface of the magnetic material substrate under the protection of inert gas; finally, densification sintering and tempering treatment are carried out. Electrospark deposition has little influence on the properties of the substrate, can accurately control the coating amount and coating area, and the equipment is simple; at the same time, the protection of inert gas can effectively inhibit the oxidation phenomenon of the light rare earth-based diffusion source during the coating process. The present invention effectively increases the utilization efficiency and diffusion depth of the light rare earth diffusion source, significantly reduces the production cost, and has the effects of preventing the oxidation of the light rare earth diffusion source, effectively improving the coercivity of the magnetic material substrate, enhancing the diffusion efficiency and reducing the cost.

The application belongs to the technical field of surface engineering, and discloses a preparation method of an electric spark deposition titanium carbide wear-resistant coating of an agricultural machinery wearing part and the coating. The method comprises the following steps: under the protection of argon, titanium carbide is used as an electrode to perform electric spark deposition on the surface of a base body which has been polished and cleaned, so as to obtain a titanium carbide coating. The titanium carbide coating has a small friction coefficient, high wear resistance and a certain thickness.

This invention relates to a composite self-lubricating coating for low- and medium-carbon steel materials and its preparation method. The coating comprises a wear-resistant deposited layer on the surface of the low- and medium-carbon steel material and a self-lubricating layer sprayed onto the surface of the deposited layer. The wear-resistant deposited layer is a tungsten carbide deposited layer, and the self-lubricating layer is a molybdenum disulfide self-lubricating layer. A scaly tungsten carbide deposited layer is formed on the surface of the low- and medium-carbon steel material using electrical discharge deposition (EDD) technology. Then, molybdenum disulfide is sprayed onto the tungsten carbide deposited layer using a spraying technique to form the self-lubricating layer. After baking and cooling, the composite self-lubricating layer is formed. The combination of tungsten carbide and molybdenum disulfide significantly improves the wear resistance and hardness of the material, especially in applications under abrasive wear environments, effectively extending the service life of the workpiece. Furthermore, the process provided by this invention is simple, easy to operate, has low equipment costs, and is easily achievable for large-scale mass production.

The invention discloses an ultrasonic impact assisted electric spark repair method for casting defects of a high-aluminum-titanium high-temperature alloy. The ultrasonic impact assisted electric spark repair method comprises the following steps: removing defect parts by adopting a mechanical removal method, and cleaning a machined surface; depositing a repair alloy material at the defect-removed part by using an electric spark deposition technology; the surface of the repairing layer is polished, so that the deposition surface is smooth; performing impact strengthening on the deposition area by using an ultrasonic impact head; continuously carrying out electric spark deposition repair, polishing and flattening and ultrasonic impact treatment for multiple times until the repaired area is filled with metal; and finally, the ultrasonic impact head is used for conducting high-power impact strengthening on the repairing area again, and repairing is completed. The method can be used for high-performance repair of the casting defects of the nickel-based high-temperature alloy with the high aluminum and titanium content, and the defects such as cracks and pores generated during repair of a traditional fusion welding method are avoided.

The present invention provides a simulation calculation method for surface strengthening by multi-channel electrospark deposition and preparation of composite coatings, comprising the following steps: step one, establishing a three-dimensional geometric model; step two, setting material properties; step three, meshing the geometric model; step four, loading the discharge channel heat source; step five, generating deposition spots and preparing composite coatings; step six, solving and calculating the temperature field and post-processing the results; step seven, structural calculation and analysis; step eight, solving and calculating the stress and strain and post-processing the results. The present invention can establish a three-dimensional simulation model according to working conditions such as deposition electrodes of different materials, substrates, and different pulse discharge energies, and simulate and analyze the transient temperature field, heat flux density, transient stress field, thermal deformation, deposition spot generation, and composite coating preparation process, and obtain more accurate transient processing results.