39 results about "Glow plasma" patented technology

The invention discloses a medium-entropy (Zr, Ta, W) C coating and a preparation method and application thereof. The medium-entropy (Zr, Ta, W) C gradient coating is prepared on the surface of the titanium alloy or the iron-based alloy through the double-layer glow plasma surface metallurgy technology, and gradient temperature annealing treatment is conducted. The preparation method has the specific advantages that (1) the prepared coating is of a continuous gradient structure, good interface metallurgical bonding is formed between the coating and a matrix, the bonding force of the coating is not lower than 50 N, and the coating is not prone to cracking and stripping in the service process due to the high bonding strength; and (2) the hardness of the medium-entropy (Zr, Ta, W) C coating prepared by the method is 25-30 GPa, the fracture toughness is 4.0-5.0 MPa * m < 1 / 2 >, and the coating system has balanced hardness and toughness, so that the coating is endowed with excellent wear resistance. The prepared coating has excellent wear resistance and antifriction performance, and has wide application prospects in the field of wear-resistant protective coatings.

The invention discloses a preparation method of a molten salt corrosion resistant coating on the surface of a TiAl alloy, relates to the technical field of surface treatment, and aims to solve the technical problems of low binding force between an existing TiAl alloy matrix and a coating interface and poor corrosion resistance of the coating. The preparation method of the molten salt corrosion resistant coating on the surface of the TiAl alloy comprises the steps that a Zr-Y alloy is infiltrated on the surface of the TiAl alloy through a double glow plasma method, and a Zr-Y infiltrated layer is formed on the surface of the TiAl alloy; the TiAl alloy is subjected to heat preservation for 1-5 hours under the condition that the temperature ranges from 850 DEG C to 900 DEG C; a Zr-Cr-Y alloy is infiltrated on the surface of the TiAl alloy, and a Zr-Y / Zr-Cr-Y infiltrated layer is formed on the surface of the TiAl alloy; the TiAl alloy is subjected to heat preservation for 2-3 hours under the condition that the temperature ranges from 900 DEG C to 950 DEG C, and is oxidized under the condition that the temperature ranges from 860 DEG C to 920 DEG C;

The invention discloses a high bias transition carbon fiber composite material vacuum coating method, and relates to a carbon fiber composite material vacuum coating technology. The invention aims to solve the problems of high-voltage breakdown of resin and etching damage of carbon fibers caused by high-bias-voltage transition deposition of vacuum coating on the surface of the existing carbon fiber resin-based composite material. The method comprises the following steps: 1, fixing the carbon fiber composite material on the electric insulator; 2, bias voltage self-glow plasma cleaning; 3, depositing a transition layer; and 4, depositing a working coating. On the basis of an initial non-conductive mode of an electric insulator, during plasma pretreatment, the problems of electric breakdown of non-conductive resin and etching damage of conductive and low-sputtering-resistance carbon fibers are effectively solved, and non-homogeneous conductive and low-sputtering-resistance material surface bias self-glow plasma cleaning is achieved; according to the invention, the aluminum and copper coatings with compact structures are deposited by adopting HiPIMS, so that the electromagnetic wave absorption and multiple emission absorption effects are improved, and the overall electromagnetic shielding performance of the material is enhanced.

The invention belongs to the technical field of back contact cells, and particularly relates to a low UVID back contact cell and a preparation method and application thereof, and the method comprises the steps: S02, sequentially depositing a phosphorus-free oxygen-doped silicon layer and a phosphorus-doped oxygen-doped silicon layer on a light receiving surface of a silicon wafer; wherein the phosphorus-free oxygen-doped silicon layer and the phosphorus-doped oxygen-doped silicon layer are deposited by adopting a tubular PECVD (Plasma Enhanced Chemical Vapor Deposition) in a continuous coating manner under the continuous existence of glow plasma, and the following conditions are met: H0gt; h1, W0lt; w1 and C1 are smaller than or equal to (3D0 * 1019) / D1, D0 ranges from 1 nm to 5 nm, and D1 ranges from 1 nm to 5 nm; s03, depositing an anti-reflection layer; s04, then annealing is carried out; and S05, forming a second semiconductor layer on the backlight surface. According to the invention, silicon oxide does not need to be deposited on the light receiving surface of the passivation layer of the light receiving surface in advance, hydrogen does not need to be doped into the film layer of the anti-reflection layer, a high passivation level can be ensured, and the attenuation of UVID can be reduced.

Provided are methods, apparatus and systems for stabilization of a glow discharge from a plasma. Also provided are methods, apparatus and systems for processing optical signals from a stabilised glow plasma with enhanced signal to noise recovery. A first method comprises: generating an electric field within a plasma cell using an alternating excitation voltage to excite particles within the cell, to produce a glow discharge from a plasma in the plasma cell in a resonant condition; monitoring, in each excitation cycle of the alternating excitation voltage, one or more signals that correlate with glow discharge optical emissions from the plasma in the plasma cell; and, in response to said monitoring, controlling one or more operating conditions for the plasma cell to maintain the glow discharge emissions from the plasma within a desired operating range in each excitation cycle of the alternating excitation voltage. A relatively stable glow discharge optical emission is maintained via dynamic resonant feedback control of operating conditions such as the electric field that is used to excite particles within the plasma cell. The stabilization of the glow plasma can be used in glow discharge optical emission spectroscopy (GD-OES) for gas analysis and in other applications.

The present invention relates to the technical field of target sputtering, and particularly relates to a laser-assisted glow plasma magnetron sputtering device and method. The target is in the shape of a hollow cylinder and is horizontally sleeved on a target support. The base frame is a transmission shaft arranged along the width direction of the sputtering chamber. The substrate is conveyed along multiple groups of transmission shafts. A magnet assembly is provided at the inner top position of the target support to form a glow plasma region outside the target. The laser beam emitted by the laser irradiation assembly irradiates the mirror assembly, and the mirror assembly rotates in different directions so that the laser beam is reflected towards the glow plasma region to achieve collaborative sputtering coating. The laser beam interacts with the glow plasma or the sputtered target atoms to achieve different forms of coating effects. The coupling of the laser and the magnetic field can reduce the sputtering voltage, reduce the temperature of the substrate, reduce the damage of sputtered ions to the substrate film layer, improve the battery efficiency, and improve the film formation quality.

The invention discloses a high-entropy nitride ceramic coating as well as a preparation method and application thereof. The high-entropy ceramic coating material prepared on the surface of the TC21 alloy by adopting a double-layer glow plasma surface metallurgy process and a vacuum annealing technology sequentially comprises a plating layer and an N diffusion layer from top to bottom, and the composition of the plating layer is x + y + z + m + n + t = 1. The high-entropy ceramic coating has excellent mechanical properties while having high hardness, a diffusion layer can relieve the problem of mismatching of thermal expansion coefficients between the coating and a matrix while providing good binding force, and the phenomena of cracking and stripping of the coating are reduced. The ceramic coating prepared by adopting a double-layer glow plasma surface metallurgy process and a vacuum annealing technology can greatly improve the service environment and the service life of the TC21 alloy, and has wide application prospects in the field of aerospace engines.

The embodiment of the invention provides a manufacturing method of an electrostatic field dust removal device, and belongs to the technical field of electric dust removal. The manufacturing method includes: manufacturing at least one negative electrode plate for releasing negative charges; manufacturing at least one positive electrode plate which is alternately arranged in parallel with the at least one negative electrode plate and is used for receiving negative charges released by the at least one negative electrode plate; an electrostatic dust collection area and a glow plasma area are formed between each negative electrode plate of the at least one negative electrode plate and each positive electrode plate of the at least one positive electrode plate; waste gas flows between each negative electrode plate and each positive electrode plate and is alternately purified, and the waste gas is subjected to corona purification in the electrostatic dust collection area and is ionized in the glow plasma area. The electrostatic field dust removal device manufactured by the manufacturing method disclosed by the invention simultaneously realizes corona dust removal purification and plasma ionization bacteriostasis and deodorization of waste gas through two negative charge release modes.

The invention relates to the technical field of coating preparation, and discloses a preparation method and application of a SiC / SiC ceramic-based composite material with a Si-based Hf-doped coating. The bonding layer is prepared on the surface of the SiC / SiC composite material by adopting a double-layer glow plasma surface metallurgy process and consists of an outer Si-Hf deposition layer and an inner mutual diffusion layer, and the contents of Si, Hf and C in the diffusion layer are changed in a gradient manner, so that the failure caused by component mutation and property difference is relieved. The high-temperature water oxygen corrosion resistance of the Si-based doped Hf coating is improved, meanwhile, the service environment temperature of an engine is increased, the service life of the engine is prolonged, and the Si-Hf coating prepared through the method has wide application prospects in the aerospace field.

Cathode based on glow discharge and hollow cathode effect belongs to the technical field of space electric propulsion electron source, and aims to solve the problems of high failure risk of heater and difficulty in working in oxygen environment of traditional hollow cathode.The cathode comprises a gas supply pipe, a negative electrode, a contact electrode and an extraction electrode; the contact electrode is sleeved outside the discharge chamber from the top end of the negative electrode, and the extraction electrode is sleeved outside the contact electrode from the top end; the bottom plate of the negative electrode is provided with an air inlet hole in the center and is communicated with the gas supply pipe; the top cover of the contact electrode is provided with a throttle hole in the center for maintaining the air pressure of the discharge chamber; the top cover of the extraction electrode is provided with an extraction hole; a discharge power source is loaded between the negative electrode and the contact electrode, which is used for carrying out glow discharge on the gas working medium entering the discharge chamber to generate plasma; the glow plasma generates hollow cathode effect in the cylindrical negative electrode; an extraction power source is loaded between the contact electrode and the extraction electrode, which is used for making electrons pass through the throttle hole and the extraction hole in sequence and spray to form electron emission.

The invention belongs to the technical field of back contact cells, and particularly relates to an anti-LID-effect back contact cell and a preparation method thereof, and the preparation method comprises the steps: forming suede surfaces on the light receiving surface of a silicon wafer and an opening region of a second semiconductor; sequentially forming a passivation layer and an anti-reflection layer on the light receiving surface of the silicon wafer, wherein the passivation layer comprises a compact oxide layer and a phosphorus-doped oxygen-doped amorphous silicon layer which are sequentially formed; wherein the formation of the compact oxide layer comprises the following steps of: performing ozone flow gradient increasing oxidation, and then performing hydrogen plasma treatment; the formation of the phosphorus-doped and oxygen-doped amorphous silicon layer comprises the step of introducing at least one gradient change of gas under the continuous existence of glow plasma to carry out continuous coating, and the at least one gradient change of the introduced gas enables the phosphorus doping concentration in the phosphorus-doped and oxygen-doped amorphous silicon layer to be gradually increased from inside to outside. According to the invention, the anti-LID attenuation performance of the battery can be improved, and the overall passivation level and the battery efficiency can be effectively improved.

The application discloses a kind of TC4 alloy surface wear-resistant CrZrN solid solution ceramic coating and preparation method thereof, belong to TC4 alloy surface treatment field, the coating is prepared CrZrN ceramic coating using double-glow plasma surface metallurgy technology for TC4 alloy surface, the coating includes deposition layer and diffusion layer, Cr, Zr, N, Ti content in diffusion layer gradient change, alleviate the failure of coating caused by composition mutation and property difference;Compared with CrN binary coating, the CrZrN ceramic coating prepared by the application has the advantages of realizing solid solution strengthening, refining the grain and realizing metallurgical bonding between the coating and the substrate, which can effectively improve the service life of TC4 alloy substrate and can be applied to wear-resistant parts protection in the fields of aviation industry and shipbuilding industry.

The present invention discloses a method for preparing a corrosion-resistant steel strip, comprising the following steps: (1) ball-milling niobium carbide powder, sieving the sieved powder, degreasing the sieved powder, and immersing the sieved powder in a chemical plating solution to obtain a plating powder; (2) subjecting the plating powder to a plasma glow nitriding furnace for glow plasma treatment to obtain a plasma-treated powder; (3) uniformly mixing carbon steel powder, Fe-Cr alloy powder, Fe-Mo alloy powder, Fe-Si alloy powder, and Fe-Al alloy powder to obtain a mixed alloy powder, melting the mixed powder into a melt, stirring, desulfurizing, deoxidizing, and skimming the slag, then adding the plasma-treated powder, stirring, and immediately pouring the mixture into a mold for casting to obtain a cast plate; and (4) performing a constant temperature homogenization treatment, rough rolling, and finish rolling to obtain a corrosion-resistant steel strip. The steel strip prepared by the method of the present invention has good mechanical strength and corrosion resistance, is suitable for working in an environment with a certain corrosive medium or an environment with high stress requirements, improves the durability of steel components, and reduces maintenance costs.

The invention discloses a Ti-Zr-C / Ti-Zr wear-resistant co-permeation coating on the surface of TA15 titanium alloy and a preparation method thereof. A Ti-Zr-C / Ti-Zr wear-resistant modified layer is prepared on the surface of the TA15 alloy through the double glow plasma metallurgy technology, the coating is mainly composed of a Ti-Zr-C deposition layer on the outer layer and a Ti-Zr transition layer on the inner layer, the transition layer is a gradient structure layer, the content of the Zr element is continuously decreased from the surface to the inside, and the content of the Ti element is continuously increased from the surface to the inside. Under the action of 5.3 N, the lubricating oil shows a stable and lower friction coefficient, and by observing the shape of a grinding crack, the lubricating oil mainly shows slight abrasive wear and slight adhesive wear. Meanwhile, firm metallurgical bonding is formed between the coating and the base body through preparation and high-temperature diffusion of the transition layer, excellent bonding strength is shown, large external force can be borne, the service life of the TA15 alloy base body is effectively prolonged, and good application prospects are achieved.

The invention discloses a double glow plasma low-temperature carbonitriding method for a titanium alloy screw, and relates to the technical field of metal material surface treatment.The key point of the technical scheme is that a safety protection method specifically comprises the following steps that S1, screw surface cleaning is conducted, specifically, oil stains, particle impurities and oxide layers on the surfaces of the titanium alloy screw and a graphite barrel are cleaned; the cleaned screws and graphite barrels are placed in a furnace; after the air in the furnace body is removed, argon and nitrogen are introduced into the furnace until the air pressure in the furnace reaches a set value, and H2 is added to adjust the atmosphere activity; s2, pre-bombardment treatment is conducted, specifically, voltage is applied to the screws and the graphite barrel, and adsorbed impurities and oxide skin on the surfaces are cleaned; and S3, composite layer diffusion is conducted, through the titanium alloy screw double glow plasma low-temperature carbonitriding method, a Ti (C, N) diffusion layer of 10 micrometers and a TiN hardened layer of 5 micrometers are formed on the surface of a titanium alloy screw base body, the total alloy layer thickness is 15 micrometers, and the performance of the titanium alloy screw is improved.

The application belongs to the technical field of alloy surface coating preparation, and particularly relates to a nickel-based alloy surface NiCoCr medium-entropy alloy coating and a preparation method thereof. The method comprises the following steps: firstly, pretreating the nickel-based alloy surface; and then, performing double-glow plasma surface NiCoCr alloying treatment on the nickel-based alloy surface to obtain a NiCoCr medium-entropy alloy layer coating. The NiCoCr medium-entropy alloy coating has uniform internal organization and composition, a compact structure, and a metallurgical bond with the nickel-based high-temperature alloy substrate, and mutual diffusion exists at the interface between the coating and the substrate. The thickness of the coating is 30-70 microns, the coating has a compact structure, the configuration entropy is 8.314-12.471 Jmol ‑1 K ‑1 , and the coating can serve for 100 hours at a high-temperature environment of 1000 DEG C without peeling.

The invention discloses a method for preparing a porous coating on the surface of titanium alloy, and belongs to the field of material coatings. According to the method, a double glow plasma surface alloying device is adopted, one or more refractory metal elements serve as target materials, inert gas serves as protective gas, titanium alloy serves as a workpiece, an alloy layer with a certain thickness is prepared on the surface of the titanium alloy at first, then negative electrode voltage and source electrode voltage are adjusted, and therefore reverse sputtering of plasma is achieved; the surface of a workpiece containing an alloy layer is bombarded and sputtered by inert gas ions and alloying elements sputtered by a target material, and meanwhile, formation of a porous structure is induced by utilizing different diffusion rates of atoms moving inside and outside an interface in a Kirkendall effect, so that a uniform porous morphology is formed on the surface of the workpiece containing the alloy layer, and the surface of the workpiece containing the alloy layer is formed. And the titanium alloy is endowed with double properties of function and structure. The porous alloy layer prepared through the method is metallurgically bonded with the base body, and the porous alloy layer has good mechanical performance.

The utility model discloses a composite current collector, a pole piece and a battery. The composite current collector provided by the utility model comprises a base material layer, a first metal coating and a metal cementation layer, the first metal coating is arranged on at least one side surface of the base material layer; the metal cementation layer is arranged on the surface of the side, away from the base material layer, of the first metal coating; wherein the cementation metallization layer comprises a permeation part extending towards the base material layer, and the permeation part penetrates through the first metal plating layer and is embedded into the base material layer. According to the composite current collector, the conductive layer is thickened to improve the conductivity, and meanwhile, permeation connection of the base material layer is realized through a double glow plasma permeation metallization process, so that the binding force between the base material layer and the metal conductive layer is effectively improved, the use performance of a product is improved, and the service life of the product is prolonged.

The application discloses a tubular object inner wall double-glow plasma processing device, which comprises an electrode rod and a bottom disc; the bottom disc is connected with a target material tray through a first ceramic support, and the bottom disc is connected with a workpiece tray through a second ceramic support; the target material tray is provided with a target material one and a target material two, and the target material one and the target material two are in a disc shape; a hole with the same inner diameter as the workpiece is reserved on the workpiece tray, and a hollow heat preservation cover is further arranged on the workpiece tray; the workpiece is arranged at the middle position of the target material one and the target material two, and the center lines of the target material one, the target material two, the workpiece and the hollow heat preservation cover are coincident; the target material tray is connected with an electrode rod one, and the workpiece tray is connected with an electrode rod two. The application further discloses a processing method of the tubular object inner wall double-glow plasma processing device. The outer walls of the two metal target materials and the inner wall of the tubular object are at equal intervals and are located on the upper and lower sides of the tubular object, the film layer is uniform and dense, no hole and crack appear, the film layer is combined with the base body in a metallurgical way, and the service life is improved.

The present invention belongs to the technical field of corrosion-resistant coatings, and specifically relates to a Cr2N corrosion-resistant coating for the inner wall of a carbon steel storage tank and a preparation method thereof. The preparation method comprises the following steps: first, irradiating the steel with an argon ion radiation source, with the target chamber in a vacuum state during the irradiation process; then, subjecting the inner wall of the carbon steel storage tank to a double glow plasma chromium alloying treatment; and then subjecting the Cr alloy layer to an active screen ion nitriding treatment to prepare the Cr2N coating. The Cr2N coating prepared by this method exhibits a gradient distribution of internal microstructure components, with the Cr and N content gradually decreasing from the surface to the interior. The Cr2N coating is metallurgically bonded to the inner wall of the carbon steel storage tank, and interdiffusion occurs at the interface between the coating and the substrate, resulting in a dense coating structure that is resistant to corrosion from high and medium concentrations of sulfuric acid.

The invention discloses a corrosion and wear resistant high-entropy alloy coating and a preparation method thereof, the high-entropy alloy coating is arranged on the surface of a matrix, and a Cr diffusion layer, a TiVCr medium-entropy alloy intermediate layer, a TiVCrZrNb high-entropy alloy diffusion layer and a TiVCrZrNb high-entropy alloy deposition layer are sequentially arranged on the surface of the matrix. The preparation method comprises the following steps that in a vacuum environment, the Cr diffusion layer and the TiVCr medium-entropy alloy middle layer are sequentially prepared on the surface of a pretreated base body through a magnetron sputtering method; and a TiVCrZrNb high-entropy alloy diffusion layer and a TiVCrZrNb high-entropy alloy deposition layer are sequentially prepared on the surface of the TiVCr medium-entropy alloy intermediate layer through a double glow plasma surface metallurgy method. The obtained high-entropy alloy coating is good in corrosion resistance and good in wear resistance; and the interface bonding strength between the coatings and between the coating and the matrix is obviously enhanced, and the overall stability of the coating system is greatly improved.

The application provides a thermal barrier composite coating with a gradient structure, comprising a substrate and a composite coating arranged on the substrate, wherein the composite coating comprises a bonding layer arranged on the substrate and an oxygen barrier layer arranged on the bonding layer; the bonding layer is made of a NiCrAlTiHfSi coating layer; the oxygen barrier layer has a continuous gradient structure; the oxygen barrier layer is made of a Si-HfO2 coating layer; the Si-HfO2 coating layer comprises 20%-80% of Si and 20%-80% of HfO2; and along the vertical direction of the Si-HfO2 coating layer close to the bonding layer, the content of HfO2 gradually decreases. The NiCrAlTiHfSi metal bonding layer and the Si-HfO2 oxygen barrier layer are prepared by a double-layer glow plasma surface metallurgy process, the working temperature is higher than 1250 DEG C, the prepared impregnation layer is dense and uniform, has a continuous gradient structure, and the atomic combination between the bonding layer and the oxygen barrier layer forms a gradient metallurgical interface, the prepared oxygen barrier layer has good bonding strength with the bonding layer, the stress concentration in the mechanical stress or the thermal cycle process is reduced, and the safety and service life are improved.

The application provides a method for improving the performance of laser selective melting forming pure tungsten grid. By adding rare earth tantalate RETaO4 as a nucleating agent, the strength and hardness of the tungsten grid are improved, and it is more durable. In addition, the use of double-layer glow plasma surface alloying technology can further improve its performance, making it more corrosion resistant and wear resistant. The tungsten grid sample prepared by the tungsten composite powder formula and surface modification of the application can effectively improve the tensile properties and elongation, and can improve its toughness and high temperature resistance. The toughness is increased by about three times, and the specific wear rate is reduced by one unit.

The application discloses a high-temperature-resistant multi-medium-corrosion-resistant thermal / environmental barrier coating and a preparation method and application thereof. The coating has a four-layer structure, and sequentially comprises, from a substrate, a Si-Hf composite bonding layer, a double ytterbium silicate layer, a single ytterbium silicate layer and a high-entropy hafnate top layer. The bonding layer is prepared by a double-glow plasma metallurgy technology, has a continuous gradient structure, realizes good combination with a ceramic matrix composite substrate and thermal expansion matching, the double ytterbium silicate layer, the single ytterbium silicate layer and the high-entropy hafnate top layer are prepared by a plasma spraying-physical vapor deposition technology, and low porosity, high bonding strength and excellent phase stability of each layer are ensured. The coating can resist CMAS+NaVO3+H2O+O2 multi-medium corrosion for more than 100 hours in a high-temperature environment of 1600 DEG C. Through material composition design and multi-layer structure design, and in combination with a special preparation method, the service life of the coating under high-temperature multi-medium corrosion conditions is remarkably improved, and the coating has a good application prospect.

The invention discloses an oxygen-carburizing method for presetting oxygen on a titanium surface, which comprises the following steps of: 1, sequentially polishing, deoiling and removing an oxide layer on a titanium material to obtain a titanium material with an activated surface; 2, performing micro-arc oxidation on the surface-activated titanium material to obtain a titanium material with an oxidation film; and thirdly, the titanium material with the oxidation film is placed in double-layer glow plasma metal cementation equipment, oxygen-carbon co-cementation is carried out, a carbon layer is deposited, and the titanium material with the oxygen-carbon co-cementation composite modified layer containing carbon, titanium oxide and titanium carbide formed on the surface is obtained. According to the method, the surface-activated titanium material is subjected to micro-arc oxidation treatment, a compact and smooth oxidation film is obtained, oxygen is preset on the titanium surface, then oxygen-carbon co-permeation is carried out, a carbon layer is deposited, an anti-attrition carbon layer and a permeation-diffusion wear-resisting layer containing a titanium oxide and titanium carbide mixture are obtained on the titanium surface, and the method is easy to implement and low in cost. The method can be achieved only through existing micro-arc oxidation equipment and glow plasma cementation metallization equipment, and is high in reliability, safe, environmentally friendly, capable of being used for batch production and suitable for popularization.

The invention provides graphene powder and a preparation method and application thereof.The preparation method of the graphene powder comprises the steps that in a high-vacuum-degree state, inert gas serves as background gas in a microwave plasma device, and uniform and stable glow plasmas are spontaneously generated under the action of microwaves; increasing the flow of the inert gas and increasing the system pressure to a low vacuum degree state, so that the glow plasma is converted into a state in which the glow plasma and an electric arc coexist; saturated steam of a liquid carbon source is brought into a reaction cavity of a microwave plasma device through negative pressure of a system, carbon source molecules are cracked under the impact of high-energy particles under the action of glow plasmas and electric arcs, and cracked activated carbon components are nucleated and grow to obtain graphene powder. According to the method, the graphene powder is prepared by adopting a microwave plasma technology, and the nanoscale graphene powder with excellent dispersity can be continuously and efficiently prepared.

The present invention discloses a method for alloying and preparing a coating on the surface of pure magnesium, comprising the following steps: (1) alloying the surface of pure magnesium: using dual-glow plasma alloying technology, the heat-insulating cover used is a pure zinc plate, connected to the cathode stage, the heat-insulating cover is connected to the target zinc sheet, the pure magnesium is connected to another cathode electrode as a substrate, and the cavity is grounded as an anode; (2) preparing a composite coating: using magnetron sputtering technology to plate the zinc-alloyed pure magnesium, using one or both of high-purity metal oxides or precious metals as targets. The present invention uses dual-glow plasma surface alloying to prepare a pure magnesium surface alloy layer, which serves as a transition layer, and then uses magnetron sputtering to prepare a functional coating on the transition layer. The method used is safe and pollution-free, and the resulting coating has uniform composition, low porosity, a large deposition area, strong bonding with the substrate, and easy control of the thickness and composition of the coating.

According to the thin-wall special-shaped metal sealing ring surface toughening CoMoCrSi coating, a double-layer glow plasma surface metallurgy technology is utilized, a CoMoCrSi alloy serves as a target material, a nickel-based high-temperature alloy thin-wall special-shaped metal sealing ring serves as a workpiece, and the thin-wall special-shaped metal sealing ring surface toughening CoMoCrSi coating is obtained through three steps. The method comprises the following steps: 1, regulating and controlling surface micro-area plastic deformation of a metal sealing ring by controlling current density, and realizing gradient change of roughness from a boundary to a center by virtue of an edge effect; secondly, remelting of the protruding position of the plastic deformation area is caused through the hollow cathode effect, target material element diffusion is accelerated, and interface mechanical-metallurgical bonding is achieved; and thirdly, the surface toughening CoMoCrSi coating with the gradient structure is formed through deposition. The mechanical occlusion depth between the coating and a workpiece is 2-6 microns, the thickness of a deposition layer is 10-30 microns, the thickness of a metallurgical diffusion layer is 1-5 microns, and the coating is high in toughness, simple and convenient in process, high in production efficiency, low in cost and suitable for batch processing.

An electrostatic field dust removal device, which relates to a technical field of electrostatic precipitation, includes: at least one negative electrode plate for releasing negative charges; and at least one positive electrode plate, which is alternately arranged in parallel with the at least one negative electrode plate, for receiving the negative charges released by the at least one negative electrode plate; wherein an electrostatic dust removal region and a glow plasma region are formed between each negative electrode plate of the at least one negative electrode plate and each positive electrode plate of the at least one positive electrode plate; and waste gas flows between each negative electrode plate and each positive electrode plate and is alternately purified, wherein it is purified by corona in the electrostatic dust removal region and ionized in the glow plasma region.

This invention discloses a method for physical vapor deposition of a ceramic coating on the surface of an extrusion die working belt, belonging to the technical field of coating on the surface of extrusion die working belts. The method includes the following steps: surface pretreatment of the extrusion die working belt, including cleaning and degreasing, polishing, and activation treatment; the activation treatment refers to sequentially performing acid washing, primary salt washing, water washing, glow discharge plasma treatment, secondary salt washing, and water washing on the surface of the extrusion die working belt using an activation treatment solution; preparing a ceramic coating material by depositing the ceramic coating material on the surface of the extrusion die working belt using physical vapor deposition equipment to form a ceramic coating with a thickness of 4 micrometers to 6 micrometers; and post-treatment of the extrusion die working belt surface. The ceramic coating of this invention has high hardness, strong bonding strength with the die surface, excellent impact resistance, and is less prone to cracking, peeling, or even breakage.