2510results about How to "Prevent oxidation" patented technology

The invention discloses a functionalized graphene oxide-MXene nanosheet enhanced self-repairing anticorrosive coating and application thereof, and belongs to the technical field of corrosion prevention. The functionalized graphene oxide-MXene nanosheet enhanced type self-repairing anticorrosive paint is prepared from functionalized modified graphene oxide-MXene nanosheets, self-repairing polyurethane containing S-S bonds and a solvent, wherein the functional modified graphene oxide-MXene nanosheet is obtained by hydrolyzing the modified graphene oxide-MXene nanosheet by a silane coupling agent containing an S-S bond, and the special functional modified graphene oxide-MXene nanosheet is introduced into the coating, so that the coating shows enhanced corrosion resistance and self-repairing characteristic, and can be widely applied to corrosion prevention of alloy materials.

The invention belongs to but not limited to the technical field of blind hole machining, and discloses a process method and system for laser composite efficient precision machining of blind holes, and the process method comprises a laser hole prefabricating stage and a laser fine hole repairing stage; a hole is preformed in the punching position of a workpiece through a large-pulse-energy laser beam, and fixed-point materials of the workpiece are rapidly removed; and then the hole is finely trimmed through ultra-short pulse width laser, the incident angle direction of a laser beam and the surface of the material is changed through a rotary cutting system, the hole wall and the hole bottom of the hole after the pre-hole stage are trimmed, fine trimming of the blind hole is completed, and the high-precision blind hole with the controllable taper is obtained. The method comprises the following steps: quickly removing a prefabricated blind hole in a workpiece material by using large pulse energy laser; adjusting process parameters, and quickly pre-processing a blind hole with a certain depth in a workpiece; and then the hole wall and the hole bottom of the blind hole are trimmed through high-speed rotating light beams and variable light beam incidence angles of the rotary cutting system, smooth hole wall, flat hole bottom and controllable taper of the blind hole are achieved, and the machining quality and efficiency of the blind hole of the difficult-to-machine material are improved.

The invention discloses a low-cost high-cerium neodymium iron boron diffusion magnet and a preparation method and application thereof, and relates to the technical field of rare earth permanent magnet materials. Comprising the steps that a neodymium iron boron alloy casting piece Ce30 with the Ce content being 10 wt% and a neodymium iron boron alloy casting piece Ce50 with the Ce content being 15 wt% are prepared through burdening and smelting, after the Ce30 and Ce50 neodymium iron boron alloy casting pieces are evenly mixed, hydrogen decrepitation, jet milling, oriented pressing, cold isostatic pressing and vacuum sintering are sequentially carried out, and a high-cerium sintered neodymium iron boron matrix is obtained; carrying out grain boundary diffusion on the high-cerium sintered neodymium-iron-boron matrix to obtain a high-cerium neodymium-iron-boron diffused magnet; the performance of the blank prepared through the method is close to the N40 mark, the performance of the magnetic sheet after diffusion reaches the 38MT mark, the magnetic performance is kept at the high level, the Ce content is high, efficient utilization of the high-abundance element cerium is achieved, the production cost of the rare earth permanent magnet material is greatly reduced, industrial batch production can be achieved, and balanced utilization of rare earth resources is promoted.

The invention relates to a composite phase-change film based on liquid metal and PBO fiber and a preparation method thereof, and belongs to the technical field of phase-change material preparation, and the preparation method comprises the following steps: the composite phase-change film comprises a poly (p-phenylbenzobisoxazole) fiber (PBO) base material, a phase-change material and a heat-conducting filler, the phase-change material is composed of phase-change microcapsules (PM) which are prepared by taking polyurethane (PU) as a wall material and organic solid-liquid phase-change materials (OPCMs) as a core material through a Pickering emulsion polymerization method. The prepared PM has a core-shell structure, and leakage of OPCMs is effectively prevented. The PM and the PBO fiber network are combined, so that the dual packaging of the OPCMs is realized, and the leakage of the OPCMs is further prevented. Meanwhile, dispersion and interaction of the OPCMs in a PBO matrix are optimized, and formation of a network structure with a limited domain is promoted. The composite phase change film prepared by the invention has relatively high mechanical properties, remarkable heat conductivity, excellent and stable flexibility and excellent heat storage capacity.

The invention provides anti-aging polyurethane-zirconium phosphate composite modified asphalt and a preparation method thereof, and belongs to the technical field of building material preparation. The anti-aging polyurethane-zirconium phosphate composite modified asphalt is prepared from the following components in parts by weight: 100 parts of matrix asphalt, 3 to 15 parts of an isocyanate prepolymer, 1 to 8 parts of organic zirconium phosphate, 0.001 to 0.1 part of a catalyst and 2 to 5 parts of a solubilizer, wherein the organic zirconium phosphate is prepared by carrying out ultrasonic intercalation treatment on zirconium phosphate by adopting organic molecules. Compared with the traditional polyurethane modified asphalt, the organic zirconium phosphate in the anti-aging polyurethane-zirconium phosphate composite modified asphalt has a polyurethane cross-linked network structure, can effectively improve the high and low temperature performance of the asphalt, has a layered structure, can absorb ultraviolet rays, and can effectively improve the anti-aging performance of the asphalt. Therefore, organic molecules in the polyurethane asphalt are protected from being oxidized, the anti-aging performance is excellent, and the service life of an asphalt pavement is prolonged.

The invention belongs to the technical field of biochemical engineering, and discloses application and a method of tea polyphenol in improvement of schizochytrium limacinum DHA (docosahexaenoic acid) grease yield and grease storage, and tea polyphenol is added in the process of producing DHA by fermentation of schizochytrium limacinum. By comparing the difference of schizochytrium limacinum in tea polyphenol fermentation and traditional fermentation, it is clear that the antioxidant tea polyphenol regulates cell oxidative stress in schizochytrium limacinum, removes ROS and inhibits grease oxidation, so that grease rancidity is delayed, and grease synthesis and DHA production are increased. According to the invention, schizochytrium limacinum HX-308 is used as a receptor strain, and an antioxidant tea polyphenol is added for regulation, so that fermentation conditions under which the content of grease and DHA is obviously increased and the grease storage effect is better are obtained.

The invention discloses a Zhejiang camellia japonica clone tissue culture and rapid propagation method. A Zhejiang camellia japonica clone tissue culture and rapid propagation technical system is established by taking a non-lignified tender stem as an explant, sterilizing and then performing primary induction, subculture multiplication, strong bud culture and rooting culture. The explants are soaked before primary inoculation, and vitamin C and polyvinylpyrrolidone with certain concentration are added into a primary induction culture medium, so that browning of the explants can be effectively inhibited; hormone regulation and control and nutrient addition are combined, so that the primary induction rate reaches up to 95.3%, the multiplication coefficient reaches about 6.8, the rooting rate reaches 83.5%, efficient and rapid propagation can be realized, and the method is not limited by factors such as seasons, climate and regions. The rapid propagation offspring obtained by the system can maintain all excellent characters of a stock plant, and the strong bud obtained in the process can be used as a scion for grafting propagation, so that a technical support is provided for protection, development and utilization of rare germplasm resources and excellent clone of the Zhejiang red camellia.

The invention discloses a tunnel-type high-speed in-situ eutectic soldering station, chip mounting equipment and a chip mounting method. The device comprises a first supporting plate, a second supporting plate, a eutectic temperature control plate group and a supporting module, wherein the first supporting plate moves horizontally; the second supporting plate is arranged on the first supporting plate in an up-down moving manner; the eutectic temperature control plate group is arranged on the second supporting plate; the first driving module is arranged on the first supporting plate and drives the second supporting plate to move up and down; the second driving module drives the supporting module to move horizontally; the eutectic temperature control plate set comprises a preheating plate, an eutectic table and a cooling plate which are sequentially arranged in the movement direction of the base plate. The eutectic welding requirement of a plurality of chips on a single substrate can be met, and the chip mounting efficiency of an intensive circuit board is improved.

The invention relates to a repair welding repair method for casting defects of an equiaxed crystal high-temperature alloy structural part, belongs to the technical field of welding repair, and solves the problems that in the prior art, the repair welding success rate of the casting defects of the equiaxed crystal high-temperature alloy structural part is low, the repair welding result stability is poor, and the repair welding accessibility of local narrow parts is poor. The invention discloses a repair welding repair method for casting defects of an isometric crystal high-temperature alloy structural part. The repair welding repair method comprises the following steps that S1, defects are removed in a mechanical mode, and grooves are machined; s2, cleaning before welding; s3, the structural part is placed in a vacuum argon-filled welding box; s4, arc striking welding, wherein the welding process passes are arranged as follows: (1) after arc striking, 2-4 seconds are used firstly to enable the base metal to form a molten pool; (2) adding wires into the molten pool, and slowly feeding the wires; 3, welding spots are fully stacked through fractional wire feeding, and annular arc conveying is carried out; (4) the electric arc is slowly conveyed for a circle along the weld toe; (5) ending; and S5, performing fluorescence and X-ray detection after cooling. The casting defects of the isometric crystal high-temperature alloy structural part are efficiently and stably repaired.

The invention discloses sample acquisition equipment for cross-linking agent processing, and belongs to the technical field of cross-linking agent production equipment.The sample acquisition equipment comprises a workbench, a stirring barrel is fixedly installed on the top wall of the workbench, and a motor is fixedly installed on the top wall of the stirring barrel. According to the scheme, through cooperation of the sampling box and the sealing plate, during sampling, a user can drive the sampling box to enter the stirring barrel through the vertical rod and the mounting box for sampling, and after sampling is finished, the user drives the sampling box to move towards the outside of the stirring barrel through the vertical rod and the mounting box and takes out the sampling box filled with a cross-linking agent to complete sampling; meanwhile, when the sampling box is taken out, the elastic cushion extends and drives the sealing plate to seal the sampling box through the linkage plate, so that the sample is prevented from being scattered, and the situation that the sample is oxidized due to long-time contact with air and the accuracy of the sample is influenced is effectively prevented; the effect of improving the sample accuracy is achieved.

The invention discloses vacuum glass and a preparation method thereof. The preparation method comprises the following steps: grinding corners on one sides of the back surfaces of two glass sheets to form notches; tempering the two glass sheets, coating the outer edges of the back surfaces of the glass sheets with a first solder, and forming a notch; combining the two glass sheets; sealing the two glass sheets for the first time after the two glass sheets are combined; a getter is placed in the cavities of the two glass sheets through the notches in the sealing frame; sintering the second welding flux to form an inlaying piece and inserting the inlaying piece into the notch, wherein one end of the inlaying piece is arranged towards the cavity; elastic pressurizing devices are mounted on the two glass sheets, and the elastic pressurizing devices elastically abut against the other ends of the inlaying pieces; and sequentially carrying out vacuumizing and secondary sealing on the two glass sheets, so that vacuum is formed in the cavity, and the second welding flux is molten to seal the notch. The invention solves the problem that the solder at the vacuum lower edge part is easy to foam when being heated at high temperature in the existing vacuum glass preparation method.

The invention relates to a mussel-like polylipoic acid-based hydrogel adhesive as well as a preparation method and application thereof, and the preparation method comprises the following steps: (1) uniformly mixing a sericin solution and a caffeic acid solution, then carrying out grafting reaction to obtain a reaction solution, and carrying out dialysis treatment and drying on the reaction solution to obtain sericin grafted caffeic acid; (2) adding lipoic acid into the lithium hydroxide solution, stirring until the lipoic acid is completely dissolved, then adding sericin grafted caffeic acid, and heating for reaction to obtain a PTALi-CAS mixture; and (3) cooling the PTALi-CAS mixture, so as to obtain the mussel-like polylipoic acid-based hydrogel adhesive. The dual-network PTALi-CAS hydrogel adhesive obtained in the invention realizes wet adhesion and rapid hemostasis, has excellent comprehensive performance, and is beneficial to providing a good repair environment for wounds as a wound dressing.

The invention provides an oat green extract and a preparation method thereof, and relates to the technical field of plant extraction. The extraction method comprises the following steps: taking immature oat plants, cleaning and quickly freezing; mixing with sodium chloride, and crushing to obtain oat sections; mixing the oat sections with an ethanol solution, performing ultrasonic extraction, and performing solid-liquid separation to obtain filtrate; and filtering, purifying and freeze-drying the filtrate to obtain the oat green extract. According to the method, the immature oat plants are adopted as extraction objects, the extraction method suitable for the immature oat plants is researched, the problem of plant waste caused by the fact that oats cannot be mature in special areas is solved, local resources are effectively and reasonably utilized, and the economic value of the oat resources is maximized. According to the extraction process, effective components of immature plants are dissolved into a solvent through low-concentration ethanol, low-temperature ultrasonic and freezing wall breaking technologies, the natural activity of the effective components in the oat is not changed in the whole process, and the nutritional value of the oat green can be reserved to a greater extent.

The invention discloses a ZnFeP-particle gradient abrasion-resistant chemical composite coating and a preparation method of the ZnFeP-particle gradient abrasion-resistant chemical composite coating. The ZnFeP-particle gradient abrasion-resistant chemical composite coating is divided into a passivation layer, a low-iron ZnFeP-particle chemical composite coating and a high-iron ZnFeP-particle chemical composite coating from outside to inside, and a gradient coating with the corrosion potential from low to high is formed; the content of iron in the low-iron ZnFeP-particle chemical composite coating ranges from 0.03 wt% to 1.0 wt%, the thickness of the low-iron ZnFeP-particle chemical composite coating ranges from 8 micrometers to 18 micrometers, and the hardness of the low-iron ZnFeP-particle chemical composite coating ranges from 150 HV to 300 HV. The content of iron in the high-iron ZnFeP-particle chemical composite coating ranges from 5 wt% to 30 wt%, the thickness ranges from 8 micrometers to 18 micrometers, and the hardness ranges from 500 HV to 650 HV. By means of the ZnFeP-particle gradient abrasion-resistant chemical composite coating, a metal component can be resistant to abrasion and corrosion, and therefore the service capacity of the metal component such as electric power fittings in the abrasion working condition is obviously improved.

The invention discloses a lithium iron phosphate carbon nanotube composite material and a preparation method thereof, and belongs to the technical field of battery materials. The polydopamine is used as a carbon source to coat the lithium iron phosphate, so that the direct contact between the lithium iron phosphate and the electrolyte is avoided; meanwhile, the compatibility of the carbon nanotube composite material and the lithium iron phosphate is enhanced due to the strong adhesion, so that the carbon nanotube composite material is favorably adsorbed on the lithium iron phosphate to be sintered; a carbon coating layer formed by polydopamine and the carbon nanotubes are beneficial to permeation of an electrolyte and exposure of surface active sites, and metal ions are introduced into the carbon nanotubes of the carbon nanotube composite material, so that the electrochemical performance of the material is improved, and meanwhile, the carbon nanotubes are supported; the condition that the cyclicity of the material is reduced due to collapse of the carbon nano tube in the reaction process is prevented; cobalt is introduced outside the carbon nano tube, so that the energy density of the battery can be improved, the structures of the carbon nano tube and the positive electrode material can be stabilized, and the degradation of the material is reduced.

The invention discloses an air curtain laser failure prevention device for an aluminum-lithium alloy, and relates to the technical field of aluminum-lithium alloy ingots. The air curtain laser failure prevention device comprises a glass sheet located right in front of the laser range finder, a glass upper cover plate arranged on the side face, close to the laser range finder, of the glass sheet, a glass lower cover plate arranged on the side face, away from the laser range finder, of the glass sheet and a ventilation pipeline arranged on the side portion of the glass lower cover plate, and the ventilation pipeline is used for outputting inert gas. The side face, away from the laser range finder, of the glass sheet is purged, and an inert gas protection layer is formed. The inert gas is introduced into the ventilation pipeline at one side of the glass lower cover plate below the laser irradiation glass, and the lower part of the glass sheet is continuously purged, so that an inert gas protection air curtain is formed below the glass sheet, dust and the like can be effectively prevented from being attached to the upper glass sheet, the glass is kept clean, the laser failure is prevented, and the service life of the glass sheet is prolonged. And meanwhile, aluminum alloy oxidation of the launder can be reduced or even avoided through introduction of inert gas, and the ingot casting efficiency is improved.

The invention discloses a preparation method and application of high-water-solubility dihydroquercetin for cosmetics, and belongs to the technical field of compound extraction.The preparation method comprises the steps that larch roots are dried and smashed, soaked in cold water and filtered, filter residues are extracted through plate-frame pressure filtration, an extracting solution is concentrated, alcohol precipitation is conducted, an alcohol solution is concentrated and refrigerated till crystals are separated out, and the high-water-solubility dihydroquercetin is obtained. Adding the crystal into an inclusion solution, filtering after reaction, adding a composite decolorizing agent into the filtrate, filtering again, adjusting the pH value to be neutral, diluting until the solid content of the filtrate is 3 + / -0.5%, passing through a column, concentrating, and spray-drying to obtain the high-water-solubility dihydroquercetin for cosmetics, which is in a powder state and light in color. The composition has a good anti-wrinkle effect, a tightening effect and a soothing effect, and can be used for preparing cosmetics.

A method for improving the density of a copper alloy part comprises the following steps that forming is conducted, specifically, dry copper alloy powder is selected and laid layer by layer through a binder spraying 3D printing technology, and a binder is selectively sprayed through a slice pattern of the part till a 3D printing model is completed; curing is conducted, specifically, the printed 3D printing model is subjected to thermocuring, and after thermocuring, powder cleaning is conducted to obtain a copper alloy green body; degreasing: degreasing the copper alloy green body in a vacuum degreasing furnace to obtain a degreased green body; and sintering is conducted, specifically, the degreased blank is subjected to sectional type sintering and then cooled to the room temperature along with a furnace, and the copper alloy part is obtained. After the copper alloy powder is subjected to jet printing forming through a binding agent, under the vacuum thermocuring process, a printed model has certain strength, and oxidation cannot be generated; the binder is effectively removed through vacuum degreasing, the quality and performance of the subsequent sintering process are guaranteed, and the compactness of the part is remarkably improved through segmented sintering and furnace cooling.

The invention relates to an anti-yellowing automobile composite film and a preparation method thereof, and belongs to the technical field of high polymer materials. The yellow-resistant automobile composite film is prepared from the following components in parts by weight: 60 to 70 parts of PVC (Polyvinyl Chloride) master batch, 10 to 20 parts of TPU (Thermoplastic Polyurethane) master batch, 1 to 2 parts of plasticizer, 0.5 to 0.8 part of flatting agent, 0.1 to 2 parts of yellowing-resistant modifier and 0.1 to 2 parts of modified flame retardant, sym-triazine cyanuric chloride and a benzotriazole intermediate in the anti-yellowing modifier absorb ultraviolet rays and reduce yellowing of the ultraviolet rays on the composite material, and maleimide groups, maleic anhydride and isocyanurate rings for increasing the crosslinking density cooperate with one another, so that the heat resistance of the material is improved, and the yellowing is reduced; phosphorus and nitrogen main chains of phosphonitrilic chloride trimer in the modified flame retardant have a conjugation effect, so that a protective film is formed, oxygen is isolated, and the phosphonitrilic chloride trimer and nitrogen are synergistically flame-retardant; the anti-yellowing automobile composite film prepared by the invention not only has excellent ultraviolet absorption performance, heat resistance and anti-yellowing effects, but also has a good flame retardant effect.

The invention provides a ceramic rigid-flex circuit substrate and a preparation method thereof, and the method comprises the specific steps: S1, cleaning a ceramic substrate, and arranging a brazing metal transition layer on the surface of the ceramic substrate; s2, low-melting-point brazing filler metal is sprayed to the surface of the brazing metal transition layer of the ceramic substrate, and a multi-layer flexible circuit board is attached to the surface, sprayed with the low-melting-point brazing filler metal, of the aluminum nitride ceramic substrate to obtain an attached plate; and S3, placing the laminated board in a vacuum or protective atmosphere for welding to obtain the ceramic rigid-flex circuit substrate. The ceramic substrate is adopted, the brazing metal transition layer is introduced to the surface of the ceramic substrate, the welding process of the flexible circuit board and the ceramic substrate is optimized, the problems that heat conduction is difficult, interface thermal resistance is large and uneven or bonding strength is insufficient are effectively solved, and the overall performance and quality of a product are improved.

The invention relates to the technical field of welding devices, in particular to an aluminum alloy door and window welding machine which comprises a mounting support, an air cylinder is mounted at the upper end of the mounting support, an output shaft of the air cylinder penetrates through the mounting support, and a welding mechanism is mounted on the output shaft of the air cylinder and comprises a first mounting plate fixedly connected with the output shaft of the air cylinder. An exhaust mechanism is mounted on the other side of the first mounting plate, four sets of first electric telescopic rods are mounted on the inner side of the mounting support, clamping mechanisms are mounted on output shafts of the first electric telescopic rods, and welding seams between arc-shaped window frames can be welded through mutual cooperation of second electric telescopic rods and first welding heads; and welding can be conducted on inner side welding seams of the assembling grooves, welding is more comprehensive, connection between the arc-shaped window frames is more stable, through mutual cooperation of a fourth gear and a third electric telescopic rod, comprehensive cleaning is conducted on the peripheries of the welding seams, cracks and bubbles during welding are avoided, and the welding seams are firmer.

The invention belongs to the field of geological exploration soil sample storage, and discloses a geological exploration portable soil sample storage device which comprises a box body, a buffer device fixedly arranged below the box body, fixing devices symmetrically arranged on the two sides of the buffer device, auxiliary devices symmetrically arranged on the two sides of the box body, and a partition assembly arranged on the inner wall of the box body. A containing device is arranged in the partition assembly in a matched mode, a sealing device is arranged above the box body in a matched mode, a temperature monitoring device is fixedly arranged below the sealing device, and connecting devices are symmetrically arranged on the periphery of the sealing device. The problems that in the prior art, when geological exploration soil is sampled, sampled soil cannot be stored, and the sampled soil is prone to being polluted or oxidized by the outside are solved, and the device is suitable for conducting heat preservation on the sampled soil when the geological exploration soil is sampled, so that the sampled soil effectively keeps the original state of a sample, and the sampling efficiency is improved. And the sampled soil is sealed, so that the sampled soil is prevented from being polluted or oxidized by the outside, and the accuracy of subsequent laboratory detection is not influenced.

The invention relates to a graphite negative electrode material and a preparation method thereof, a negative electrode plate and an electrochemical device. The graphite negative electrode material comprises secondary particles formed by granulating and carbonizing 20%-90% of a doped porous graphite precursor, 5%-30% of hard carbon particles and 5%-50% of a coating agent, in the secondary particles, the hard carbon particles are at least partially filled in holes of the doped porous graphite precursor, and the coating agent is at least partially filled in the holes of the doped porous graphite precursor. And after the coating agent is carbonized, at least part of the coating agent forms amorphous carbon to coat the outer layer of the doped porous graphite precursor. According to the scheme provided by the invention, the doped porous graphite precursor can be compounded with the hard carbon particles and the coating agent to obtain the graphite negative electrode material with high capacity and fast charging performance.

The invention provides a W1 / OG / W2 type multiple emulsion based on a micro-fluidic chip and a preparation method, and belongs to the technical field of multiple emulsions. The intermediate phase of the multi-emulsion is separated by the oil gel phase OG, so that the exchange of internal and external two-phase substances is thoroughly prevented, the reaction of the internal and external two-phase substances is avoided, the substance compatibility is enhanced, and meanwhile, the aqueous phase thickener is added into the hydrogel phase W2, so that the viscosity of the hydrogel phase W2 is increased, the aggregation of liquid drops is delayed, and the stability of the emulsion is improved. According to the method, the active encapsulant can be encapsulated in the microdroplet to form a protective layer, so that the contact with air and the external environment is reduced, the encapsulant in the water-in-oil phase W1 / O is effectively prevented from being oxidized, the stability and the slow-release effect of the encapsulant are improved, and the storage life is prolonged. The multi-emulsion has wide applicability and can be widely applied to the fields of food, medicines, health care products and the like.

The invention relates to the technical field of copper plate strip machining, and provides an advanced copper plate strip continuous rolling technology which comprises the steps that S1, a copper ingot with the copper content of 99.9% or above is selected, and raw materials are obtained through saw cutting and surface polishing; s2, the treated copper ingot is heated in a heating furnace, and the internal temperature uniformity of the copper ingot is guaranteed; s3, a roughing mill is used for rolling the heated copper ingot, and rough rolling is conducted for 2-3 passes; s4, the copper strip subjected to rough rolling enters an intermediate rolling mill, and intermediate rolling passes are 3-5 times; s5, the copper plate strip subjected to intermediate rolling enters a finishing mill, and the finishing pass is 3-4 times; and S6, on-line cooling is conducted, specifically, the copper plate strip obtained after finish rolling enters an on-line cooling system immediately. Through early-stage accurate saw cutting and polishing treatment, the initial quality of the copper plate strip is guaranteed, smooth proceeding of subsequent rolling procedures is guaranteed, the multi-pass continuous rolling process of rough rolling, intermediate rolling and finish rolling is combined with online cooling, and through strict parameter control, the production efficiency is improved, the energy consumption is effectively reduced, and the production cost is reduced.

The invention relates to low-emissivity coated glass and a preparation method thereof. The low-emissivity coated glass comprises a glass substrate and a coating layer arranged on one side of the glass substrate, the coating layer comprises a base layer, a first seed layer, a first functional layer, a first barrier layer, a second functional layer, a second barrier layer, a second seed layer, a third functional layer, a third barrier layer and a top dielectric layer which are sequentially coated outwards from one side of the glass substrate. According to the invention, the barrier layer is controlled to adopt the metal simple substance with excellent compactness and stability and high melting point or the barrier layer is controlled to adopt the nitride, the silicon nitride, the silicon carbonitride or the silicon boron nitride and the like of the metal material, so that the function layer is protected from being oxidized, the radiation rate and the reflectivity are low, and the service life is long. And stability is achieved in the heat treatment process.

The invention discloses a method for preparing battery-grade iron phosphate by recovering lithium iron phosphate battery black powder, which comprises the following steps of: performing reduction acid leaching on the lithium iron phosphate battery black powder to obtain acid leaching liquid; adding sodium silicate into the acid leaching solution to adjust the pH value of the solution to 2.5-4, removing aluminum and titanium to obtain a primary impurity-removed solution, deeply removing aluminum and titanium from the impurity-removed solution by adopting ion exchange resin, and removing copper and filtering by adopting sulfide to obtain a copper-removed solution; supplementing iron is added into the copper removal liquid, the pH is adjusted to 3.5-6.5, ferrous phosphate reacts and is separated out, and ferrous phosphate is obtained; the method comprises the following steps: carrying out acid leaching on ferrous phosphate to obtain a leaching solution, adjusting the molar ratio of iron to phosphorus in the leaching solution, carrying out oxidation precipitation, adjusting the pH value of the solution again, aging, filtering, washing and drying to obtain iron phosphate dihydrate, and finally calcining to obtain the anhydrous iron phosphate. According to the method, a process route for producing iron phosphate by an ammonium method is used for reference, iron and phosphorus in the black powder of the lithium iron phosphate battery are recycled and converted into battery-grade iron phosphate in a ferrous phosphate form, impurities such as aluminum, titanium and copper are effectively removed, and the impurities are prevented from being entrained in the iron phosphate.

The invention belongs to the technical field of metal additive manufacturing, and relates to a preparation method of a large-size thin-wall structure based on magnetic field regulation and control of laser directional energy deposition. According to the method, the part forming area is filled with the protective gas, the oxygen content of the forming area is 100 ppm or below, and oxidation and inclusion pollution of alloy in the forming process are avoided. By starting the electromagnetic field generator, a stable uniform magnetic field is formed in a part forming area, the metallurgical behavior of a molten pool is regulated and controlled through the thermal damping effect and the thermal electromagnetic convection effect generated by the magnetic field in the molten pool, and optimization of the grain structure is achieved. A laser cladding head is started, powder metal materials are conveyed to the position of a molten pool through powder carrying gas, and the powder metal materials are molten through laser to form a stable molten pool; and a laser cladding head is controlled to scan in a uniform magnetic field area according to a set track to carry out circulating deposition, and light stopping is carried out every time deposition of one layer is completed, so that heat of a deposition layer is released, and heat accumulation is reduced until part forming is completed.

The invention belongs to the technical field of battery material production, and particularly relates to a preparation method of high-purity titanium dioxide for batteries. The invention aims to provide a preparation method of high-purity titanium dioxide for a battery. The preparation method is used for solving the technical problem that the impurity removal rate is not increased by improving a preparation method of an additional seed crystal and optimizing procedures in the prior art. The titanium slag is used as a raw material, a metatitanic acid crude product is obtained after alkali baking pretreatment, acidolysis and hydrolysis, redundant impurities are removed through subsequent procedures, and the high-purity titanium dioxide for the battery is obtained. The titanium slag subjected to alkali roasting treatment is changed in component structure, the concentration and temperature of sulfuric acid required by acidolysis are greatly reduced, oxalic acid and a complexing agent are added in the hydrolysis process to hydrolyze titanium ions to form metatitanic acid, the purity of the metatitanic acid is greatly improved, seed crystals prepared through ultrasonic treatment are added, and the prepared metatitanic acid can be calcined at a low temperature to form rutile type titanium dioxide. The prepared titanium dioxide has high purity and relatively high specific surface area.

The invention belongs to the field of graphite purification, and particularly relates to a segmented purification method of natural graphite. According to the method provided by the invention, natural graphite and sodium hydroxide are mixed and ground, rapid cooling is performed after microwave treatment, microwave treatment is performed after hydrofluoric acid circulation treatment, and a high-purity graphite product is obtained. In order to solve the problems that in the prior art, natural graphite is low in purity, and the conductivity is reduced after purification, according to the segmented purification method of the natural graphite, high-purity graphite with excellent conductivity is obtained through segmented alkali treatment, microwave treatment, acid treatment and microwave treatment.