430 results about "Aluminum coating" patented technology

Examples of methods of hot forming structural components are provided. The methods include heating a blank made from an Ultra High Strength Steel with an aluminum coating and forming the heated blank in a multi-step production line or apparatus.

The invention belongs to the technical field of semiconductors, and particularly relates to a silicon carbide insulating substrate based on double-sided aluminum coating and a preparation method thereof. A first silicon carbide layer, a second silicon carbide layer and a third silicon carbide layer are sequentially arranged on the silicon carbide insulating substrate from top to bottom in the thickness direction of the silicon carbide insulating substrate. A first metal layer is arranged between the first silicon carbide layer and the second silicon carbide layer, and a second metal layer is arranged between the second silicon carbide layer and the third silicon carbide layer; an upper copper layer is arranged on the first silicon carbide layer, and the upper copper layer is provided with an etching position; and a lower copper layer is arranged on the third silicon carbide layer. The three silicon carbide layers are arranged on the silicon carbide insulating substrate, the metal layer is arranged between every two silicon carbide layers, and the thermal stress and junction temperature of the chip can be reduced by using silicon carbide as the insulating layer; the metal layer is arranged on the surface of the silicon carbide insulating layer, thermal stress impact can be reduced, the chip can be prevented from being damaged due to overlarge thermal stress, and the reliability of the module can be improved.

The invention discloses a method for preparing dimethyl carbonate through reaction of CO and methyl nitrite, belongs to the technical field of preparation of dimethyl carbonate, and aims to solve the problem that in the prior art, in the process of preparing dimethyl carbonate through catalysis of reaction of CO and methyl nitrite, the reaction time is short. The preparation method specifically comprises the following steps: in an inert gas atmosphere, mixing and stirring isocyanatopropyltriethoxysilane and N, N-dimethylformamide, raising the temperature of a reaction system to 50-60 DEG C, carrying out a reaction for 1-2 hours, and carrying out a reaction for 1-2 hours, so as to obtain a reaction solution; and 3-aminopropionic acid is added into the reaction system. According to the method, silicon-aluminum coating, potassium modification and 18-crown-6-ether modification are sequentially performed after a halogen-free palladium-copper catalytic system is prepared, so that the conversion rate of impurities and the chromatic value of a product are reduced, the conversion rate of methyl nitrite is effectively increased, and the service life of the catalyst is effectively prolonged.

The invention provides an acid and alkali resistant metallic yarn preparation method, which comprises: 1, mixing polyvinylidene fluoride, polyvinylpyrrolidone and a solvent, and carrying out electrostatic spinning to form a PVDF / PVP composite fiber membrane; soaking the PVDF / PVP composite fiber membrane in an aqueous solution, taking out the PVDF / PVP composite fiber membrane after soaking, cleaning and drying to obtain a PVDF fiber membrane with a groove structure; step 2, soaking the PVDF fiber membrane with the groove structure in slurry containing flaky aluminum powder, a cross-linking agent and polyacrylate emulsion, and after soaking is completed, sequentially carrying out rolling and high-temperature drying to obtain a PVDF fiber membrane with an aluminum coating; 3, the PVDF fiber membrane with the aluminum coating is cut into filaments, then a polyester yarn coating layer and a protective coating are sequentially formed on the surface of the PVDF fiber membrane cut into the filaments, and the acid and alkali resistant metallic yarn is obtained. According to the method, the binding strength of the aluminum coating and the fiber membrane is improved, full coating of the aluminum wires is achieved, and the acid and alkali resistance of the metallic yarn fabric in the subsequent dyeing and finishing process is remarkably improved.

The present invention provides a method for uniformly monitoring the temperature of cold-chain transported pharmaceuticals within a batch. The method comprises the following steps: providing a multi-tag radio frequency identification system, which includes a reader, a passive coupling antenna, and a tag; fixing the tag on the primary packaging unit and the coupling antenna on the intermediate packaging unit; using a reader externally mounted on a cold-chain transport vehicle to collect the temperature information of the pharmaceuticals filled in each primary packaging unit; during the entire cold-chain transport of pharmaceuticals, using an RFID reader to collect the temperature information of the pharmaceuticals filled in each primary packaging unit, thereby achieving full-process monitoring of the temperature of cold-chain transported pharmaceuticals. Before the RFID tag of the present invention is fixed on the primary packaging unit, a magnesium aluminum silicate coating is pre-coated on its surface, which can reduce the difference in the measurement results of the same batch of pharmaceuticals caused by too low temperature under low temperature conditions, thereby achieving uniform and accurate monitoring of the temperature of cold-chain transported pharmaceuticals within the batch.

A system includes a laser welder configured to weld a first steel workpiece to a second workpiece at an interface between them. The workpieces may have similar or dissimilar compositions and / or thicknesses. A filler wire may be used to fill a gap at the interface and / or provide a weld joint composition that accounts for the intrusion of aluminum coating from the workpiece(s) into the weld joint. The laser welder's laser beam may be laterally offset from the interface toward one of the workpieces (e.g., a thicker or stronger of the workpieces).

The invention discloses a self-lubricating aluminum coating and a preparation method thereof.The preparation method comprises the steps that molybdenum disulfide is pretreated through a silane coupling agent, tetraethoxysilane mixed liquor is added, the pH is adjusted to be 9-10, a water bath reaction is conducted, and molybdenum disulfide-silicon dioxide microcapsules are obtained after high-temperature strengthening treatment; respectively adding a zinc nitrate solution and a hexamethylenetetramine solution, adjusting the pH value to 10-11, carrying out a high-temperature and high-pressure hydrothermal reaction to obtain zinc oxide nanorods, and carrying out ball milling treatment on the zinc oxide nanorods, microcapsules, stearic acid and zirconium oxide balls under the protection of argon to obtain doped microcapsules; after raw materials are pretreated, the raw materials and a dispersing agent solution are added into a mixer respectively, spraying powder, a pretreated base body and the spraying powder are obtained after mixing treatment, spraying treatment is conducted on the surface of the base body through a plasma spraying method, and the self-lubricating aluminum coating is obtained after vacuum annealing treatment. Therefore, the obtained self-lubricating aluminum coating is low in friction coefficient, high in performance and excellent in self-lubricating property.

The invention discloses an artistic mirror based on an acrylic material and a preparation method of the artistic mirror. The artistic mirror comprises a middle PMMA layer, an aluminum coating, an upper protective layer and a lower protective layer, wherein the PMMA layer comprises an anti-aging agent and polymethyl methacrylate; the protective layer comprises a super-hydrophilic self-cleaning protective film layer structure and a protective coating of an aluminum coating. As the art mirror is made of an acrylic material, the image is clear and is not easy to break, and the use safety is greatly enhanced; a layer of high-transparency and super-hydrophilic self-cleaning protective film layer structure is attached to the surface of the artistic mirror, so that the artistic mirror is not easy to fog and stain, the composite coating has antibacterial, anti-ultraviolet and flame-retardant properties and the like due to the addition of components, the related flame-retardant property and service life requirements can be met, and the mirror is light in weight and convenient to carry and install.

The invention relates to a method for plating aluminum on the surface of a neodymium-iron-boron magnetic material, which comprises the following steps: by taking ionic liquid as an electroplating medium, optionally adding manganese chloride, adding a proper amount of additive, controlling the current distribution in the electroplating process through pulse current, and electroplating at proper temperature and current conditions. And a corrosion-resistant aluminum coating with high binding force and high compactness is obtained on the surface of the neodymium iron boron magnetic material. According to the method, the hydrogen evolution reaction is avoided, the bright and uniform aluminum coating is obtained, and the method is environmentally friendly, stable in process and suitable for high-performance surface protection and functionalization of the neodymium iron boron magnetic material.

The invention relates to a waterborne epoxy zinc-aluminum coating and a preparation method thereof. The coating consists of a component A and a component B, wherein the component A comprises or consists of the following components in parts by weight: 25-30 parts of water-borne epoxy resin; 0.1 to 0.2 part of a defoaming agent; 2-4 parts of propylene glycol monomethyl ether; 5-8 parts of propylene glycol butyl ether; 1.5 to 2 parts of fumed silica; 0.2-0.4 part of a molecular sieve dewatering agent; 0.6 to 1 part of bentonite; 0.1 to 0.5 part of nano CeO2; and 55-60 parts of zinc-aluminum alloy powder. The component B comprises or consists of the following components in parts by weight: 65-70 parts of a curing agent; 25 to 30 parts of deionized water; 2-5 parts of an anti-flash-corrosion auxiliary agent; wherein the mass ratio of the component A to the component B is 6: 1. The solid content of the waterborne epoxy zinc-aluminum coating is gt; the VOC content is 65%, and the VOC content is lt; therefore, the environmental protection performance is greatly improved.

The invention provides a laser welding method for a metal workpiece with an aluminum coating on the surface. The laser welding method comprises the following steps that (1) a first metal workpiece and a second metal workpiece which are used for welding and a laser beam used for laser welding are provided; the first metal workpiece and the second metal workpiece are respectively provided with a top surface and a bottom surface, and at least one workpiece surface is provided with an aluminum coating; the first metal workpiece and the second metal workpiece are in butt joint to form a to-be-welded assembly and a butt joint line; and (2) a laser beam advances in the direction of the butt joint line of the to-be-welded assembly so as to melt the butt joint position of the first metal workpiece and the second metal workpiece, and a welding seam is formed after cooling and solidification. According to the method, multiple laser beams are provided to act on laser welding of butt joint of the steel with the aluminum coating, so that the aluminum element is uniformly distributed in a welding seam, the influence of aluminum on a welding joint is weakened, the method is low in cost and simple to operate, and the laser welding joint with excellent performance can be obtained.

A gas turbine engine component includes a substrate having first surface and a second surface disposed opposite the first surface, a plurality of holes extending through the substrate from the first surface to the second surface, the holes defined by a plurality of respective walls each extending from the first surface to the second surface, a metallic bond coat disposed on the first surface, and an aluminide coating disposed on the first surface, the second surface, and the walls. The metallic bond coat is disposed between the first surface and the aluminide coating and the walls are free of the metallic bond coat.

The invention relates to the technical field of metal corrosion prevention, and particularly discloses a titanium alloy bolt surface aluminum coating coating method capable of improving corrosion resistance. A titanium alloy bolt surface aluminum coating coating method capable of improving corrosion resistance comprises the following steps that a titanium alloy bolt is subjected to cleaning and sand blasting pretreatment; the preparation method comprises the following steps: adding the aluminum powder and the benzaldehyde resin into the solvent, mixing and stirring, continuously adding the polytetrafluoroethylene micro powder, the diluent and the self-repairing microcapsule prepared in advance, and continuously stirring until the mixture is uniform, the prepared anti-corrosion aluminum coating is sprayed to the surface of the titanium alloy bolt, after the surface of the coating is dried, curing is conducted for 55 min to 65 min at the temperature of 180 DEG C to 200 DEG C, and the aluminum coating is obtained; the self-repairing microcapsule is prepared by mixing a microcapsule A and a microcapsule B, wherein the microcapsule A is prepared by wrapping a polyurethane prepolymer with polyvinyl butyral as a shell layer, and the microcapsule B is prepared by wrapping a curing agent support with polyvinyl butyral as a shell layer. The aluminum coating prepared through the method has the advantages of being good in corrosion resistance and durability.

The invention discloses an enhanced tensile wear-resistant multi-twisted steel wire rope, which relates to the technical field of steel wire ropes, and structurally comprises a multi-twisted steel wire rope formed by twisting three sub-ropes in a left-to-right interactive manner, and each sub-rope is formed by twisting six stranded ropes in a right-to-right interactive manner; the aluminum-based carbon fiber composite core serves as the center of the stranded rope, and the gradient functional layer comprises six center steel wires on the inner layer, twelve micro-arc oxidation concave steel wires on the middle layer, eighteen graphene / zinc-aluminum coating convex steel wires on the outer layer and twelve phase change lubricating fiber bundles on the surface layer. The outer surface of the steel wire rope is sequentially coated with a self-repairing sealing layer containing repairing microcapsules, a boehmite / silane interface bonding layer and an Al2O3 / PEEK abrasion-resistant coating. The tensile strength and the structural stability are improved through a three-stage twisting process; the aluminum-based carbon fiber composite core and the gradient functional layer synergistically enhance core bearing, wear resistance and corrosion resistance; the phase change lubricating fiber bundles release lubricating components during friction, and damage repair is achieved through the self-repairing sealing layer; and the interface bonding layer and the wear-resistant coating strengthen the surface adhesive force and the wear resistance.

A high-pressure tank comprising: a resin liner for a high-pressure tank including at least one opening portion; an aluminum mouth portion attached to the opening portion; and a reinforcement layer formed on an outer surface of the liner, wherein an aluminum oxide coating is formed on a surface of the aluminum mouth portion, the aluminum oxide coating includes a porous surface layer in which columns with an average height of 10 to 100 nm are arranged in a dispersed state, an average value of a percentages of the protruding portion area of the columns in randomly sampled 400 nm square visual fields of the porous surface layer is 5.0 to 26.0%, and an average value of the numbers of the columns in randomly sampled 400 nm square visual fields of the porous surface layer is 500 to 2000.

According to the N-type IBC battery and the preparation method thereof provided by the embodiment of the invention, the boron-containing aluminum coating is formed in the first region of the n-type raw silicon region and the laser doping treatment is carried out, so that high-concentration boron doping can be carried out on the n-type raw silicon region to form the p-type doped region; the side effect caused by the doping mode of the traditional tubular boron source is avoided, and the conversion efficiency of the cell is ensured, so that the problems that the forming mode of the p-type doped region of the existing N-type IBC cell is complicated in process and more in side effect, and the photoelectric conversion efficiency of the cell is easily influenced are solved.

The invention provides a laser welding method for a metal workpiece with an aluminum coating on the surface, at least two laser beams are symmetrically arranged in the welding advancing direction in the laser welding process, the quality factor M2 of the laser beams is smaller than 1.5, each laser beam irradiates a welding assembly, and the welding assembly is welded with the aluminum coating on the surface of the metal workpiece. More than two deep melting small holes and molten metal surrounding the small holes are formed; under the irradiation of laser beam energy, the welding zone of the assembly is melted to form an overall slender molten pool, and the front edge of the molten pool tends to the vertical advancing direction to form a nearly rectangular morphology front end; the multiple deep penetration small holes drive surrounding liquid metal to flow and enable an aluminum coating on the surface of the weldment assembly to be melted, and distribution of aluminum in a molten pool tends to be uniform. According to the method, multiple laser beams are provided to act on laser welding of butt joint of the steel with the aluminum coating, so that the aluminum element is uniformly distributed in a welding seam, the influence of aluminum on a welding joint is weakened, the method is low in cost and simple to operate, and the laser welding joint with excellent performance can be obtained.

The invention relates to the technical field of high-temperature coatings, in particular to a high-temperature anti-oxidation low-diffusion nickel-platinum-aluminum coating and a preparation process thereof.The coating comprises a beta-phase layer, a gamma '-beta transition layer, a gamma'-phase layer and a platinum layer which are sequentially distributed layer by layer from outside to inside; the preparation process comprises the following steps: preparing the platinum layer on the surface of the substrate in a magnetron sputtering manner; preparing a gamma'phase layer on the surface of the platinum layer by adopting a multi-arc ion plating mode; preparing a gamma '-beta transition layer on the surface of the gamma' phase layer; and preparing a beta-phase layer on the surface of the gamma '-beta transition layer. The high-temperature anti-oxidation low-diffusion nickel-platinum-aluminum coating and the preparation process thereof aim at solving the problem that a platinum-aluminum coating is poor in high-temperature oxidation resistance.

This invention discloses a corrosion-resistant aluminum-based multilayer coating on the surface of a sintered NdFeB magnet and its preparation method, comprising: pretreatment of the magnet; preparation of the aluminum coating: in the presence of an inert gas, after adjusting the pressure of the environment to a first preset value, depositing an aluminum coating on the pretreated sintered NdFeB magnet; preparation of the aluminum-based barrier coating: in the presence of a reactive gas, after adjusting the pressure of the environment to a second preset value, exciting the reactive gas into a high-density plasma, generating an aluminum-based barrier layer on the surface of the sintered NdFeB magnet with the deposited aluminum coating; repeating steps S200 and S300, followed by cooling, to complete the preparation of the corrosion-resistant aluminum-based multilayer coating on the surface of the sintered NdFeB magnet. This invention does not involve reactive sputtering, effectively avoiding the "palladium poisoning" phenomenon during the deposition process, and the prepared multilayer coating has excellent corrosion resistance.

The invention discloses a method for preparing an aluminum oxide coating on the surface of neodymium iron boron for a new energy automobile motor, which comprises the following steps: (1) pretreating the surface of a base material: firstly, carrying out corner passivation, degreasing, sand blasting and other pretreatments on a neodymium iron boron magnet, cleaning the surface of the neodymium iron boron magnet by using compressed air after the sand blasting pretreatment is completed, and drying the surface of the neodymium iron boron magnet; removing loose neodymium-iron-boron particles or sand grains on the surface of the neodymium-iron-boron magnet; (2) preheating treatment: respectively preheating the neodymium iron boron magnet and the powder; (3) plasma spraying: coating the surface of the neodymium-iron-boron magnet with the powder by adopting a plasma spraying technology; and (4) hole sealing is conducted, specifically, the sprayed neodymium-iron-boron magnet is soaked with hole sealing agent epoxy resin, redundant glue is wiped away with propyl alcohol, and the neodymium-iron-boron magnet is placed in a vacuum drying box to be dried. The aluminum oxide ceramic coating and the yttrium oxide ceramic coating prepared by the method have good coating uniformity, corrosion resistance, adhesive force and lower porosity.

A preparation method for a thermal control coating, comprising the following steps: A) cleaning a substrate and then carrying out sandblasting treatment; B) preheating the substrate obtained in step A); C) spraying a NiCrCoAlY transition layer on the surface of the substrate obtained in step B); and D) carrying out plasma spraying on the surface of the substrate obtained in step C) to obtain an aluminum oxide coating. Compared with existing electrochemical aluminum oxide thermal control coatings, the aluminum oxide coating prepared by means of plasma spraying has high binding strength, high hardness, good wear resistance, and high spectral reflection performance and infrared emission performance.

Provided is an aluminum coated steel sheet having excellent anti-corrosion properties and weldability, and a manufacturing method thereof. The aluminum coated steel sheet includes: an austenitic base steel sheet including at least 70 area % of an austenite microstructure; and an aluminum coating layer formed on the base steel sheet, wherein the base steel sheet includes at least 80 area % of ferrite in a surface layer portion, which denotes a region extending from the interface with the coating layer to a depth of 100 μm into the base steel sheet, and the aluminum coating layer may have a composition comprising 2-12 wt % of Si, 5-30 wt % of Zn, and 0.1-5 wt % of Mn, with the balance being Al and inevitable impurities.

The invention relates to the field of suspension plasma spraying, in particular to a long-service-life suspension plasma spraying thermal barrier coating based on a platinum-aluminum coating and a preparation method of the long-service-life suspension plasma spraying thermal barrier coating. The preparation method comprises the following steps: preparing a vertical crack or columnar-like structure ceramic layer on the surface of a platinum modified aluminide bonding layer with lower roughness by using suspension slurry prepared from fully-stable tetragonal phase yttrium oxide stabilized zirconium oxide powder and adopting suspension plasma spraying suspension, so as to obtain a thermal barrier coating system with long service life. The problems that in the prior art, due to stress existing between a ceramic layer prepared through plasma spraying and a low-roughness platinum modified aluminide bonding layer, cracks are continuously formed and expanded at an interface, and the service life of a thermal barrier coating system is short are solved. The long-life thermal barrier coating system can be prepared on the platinum modified aluminide bonding layer through suspension plasma spraying.

The invention relates to the technical field of single-crystal high-temperature alloy welding, in particular to a brazing method for DD26 single-crystal high-temperature alloy and MX62 wear-resistant alloy. The method specifically comprises the following four steps: step 1, brazing treatment; step 2, primary aging heat treatment; step 3, gas phase aluminizing; and 4, coating diffusion and secondary aging co-treatment. Brazing treatment (1180 DEG C), primary aging heat treatment (1080 DEG C), gas-phase aluminizing (950 DEG C) and coating diffusion and secondary aging co-treatment (870 DEG C) are carried out, and the temperature of the heat treatment process is reduced from high to low. According to a blade structure obtained after welding, the gamma'phase keeps the original cubic shape and is small in size, dendritic crystal trunk and dendritic crystal gamma 'phase are small in size difference and free of raft formation, meanwhile, recrystallization does not occur on the surface of a blade body, a strengthening phase in MX62 abrasion-resistant alloy does not decompose, the tensile strength of a welded joint at the temperature of 950 DEG C reaches 361 MPa, the shear strength at the temperature of 950 DEG C reaches 326 MPa, and the endurance life of the welded joint at the temperature of 950 DEG C / 75 MPa reaches 96 h.

The invention relates to the technical field of coatings, in particular to a salt-fog-resistant aluminum coating fabric and a production process. The salt-fog-resistant aluminum coating fabric comprises the following raw materials in parts by weight: a basic fabric: 15-32 parts of polyester fibers, 12-28 parts of nylon fibers, 8-22 parts of glass beads and 25-65 parts of modified water-based acrylate emulsion; the spraying solution comprises the following components in parts by weight: 15-30 parts of graphene zinc powder, 12-23 parts of modified epoxy resin, 8-16 parts of an epoxy curing agent, 5-12 parts of polyether alcohol, 2-4 parts of a silane coupling agent, 21-36 parts of aluminum powder and 4-16 parts of hydroxyethyl cellulose. The prepared salt-fog-resistant aluminum coating fabric has excellent high-temperature oxidation resistance and stripping resistance, is excellent in performance as a roller shutter in a severe environment, and is good in scene penetrating effect, high in adhesion, good in reflection effect and good in corrosion resistance when being applied to the roller shutter.

The present application relates to the manufacture of high-strength steel coated plate welded parts, in particular to a welding material, a high-strength steel workpiece, a laser welded joint and a manufacturing method thereof. The composition of the welding material satisfies the following conditions in terms of percentage by weight: C is greater than or equal to 0.5%, trace alloying elements are 0-0.36%, the content of Mn and Si is less than or equal to 2%, 6% is greater than or equal to 5C+Mn and is greater than or equal to 2.5%, and the rest is Fe and inevitable other elements; the trace alloying elements are at least one of Nb, V and Ti elements, and the content of Nb, V and Ti elements is less than or equal to 0.12%. The method does not need to remove the aluminum coating, utilizes the solid solution strengthening effect of C, and makes the volume fraction of lath martensite in the final weld after quenching greater than or equal to 90%. This scheme reduces the addition of alloying elements, reduces the cost and process control difficulty, avoids the formation of coarse carbides, improves the mechanical properties and stability of the joint, has high fracture strength and elongation, and realizes the double improvement of the strength and toughness and economy of the joint.

The invention discloses an intelligent zinc-aluminum coating quality monitoring method and system for a wind power blade bolt, and solves the problems that internal defects of a coating cannot be found in an early stage and predictive maintenance cannot be realized in the prior art. The method comprises the following steps: acquiring multi-source monitoring data of coating internal defects, interface micro-strain and corrosion states through a terahertz imaging unit, a pre-embedded FBG sensing unit and a microelectrode array ECN acquisition unit which are integrated on an inspection robot; after carrying out local preprocessing by utilizing an edge computing gateway, synchronizing data to a digital twinborn analysis platform deployed with a coating state intelligent evaluation model so as to output a current health state grade and residual life prediction of the coating; finally, a maintenance decision suggestion is automatically generated or an equipment control instruction is triggered based on the result, closed-loop monitoring from state sensing to intelligent execution is formed, and the system comprises a corresponding hardware module and a software platform and is used for achieving the method.

Disclosed is a laser welded joint (2). When two steel plate base materials are butt-jointed for laser welding, a laser welding solder is added to a molten pool, thereby forming an initial weld seam, and the initial weld seam is quenched to form the laser welded joint (2), wherein at least one steel plate is a steel plate having an aluminum coating or an aluminum alloy coating; the volume fraction of lath martensite (21) in the laser welded joint (2) is not less than 90%, the average mass fraction of Mn is not less than 3.2%, the average mass fraction of Al is not higher than 1.4%, and the average mass fraction of C is lower than the C content of the steel plate base materials; and the height h1 of a reinforcement on the front face of a final weld seam formed by the laser welded joint (2) and the height h2 of a reinforcement on the back face of the final weld seam do not exceed 0.4 mm.

The aluminum fluoride coated nano silicon material is prepared from nano silicon powder, aluminum nitrate nonahydrate, ammonium fluoride, absolute ethyl alcohol and deionized water, and an aluminum fluoride coating layer and a nano silicon negative electrode material are compounded to form an aluminum fluoride coated nano silicon material structure. The aluminum fluoride coating layer on the surface can be converted into a fast ion conductor in the battery circulation process, so that the lithium ion diffusion rate is increased, and migration of lithium ions between the nanometer silicon negative electrode and the electrolyte is promoted. Under the coating protection effect of the coating layer, the volume expansion of the nano-silicon material is improved, the voltage attenuation speed is slowed down, the cycling stability is greatly improved, the cycling performance of the nano-silicon negative electrode material is improved, and silicon particle breakage, material pulverization and falling off from a pole piece are avoided. The coating amount of the aluminum fluoride coating layer is compared, and the optimal coating amount is given. The method has the advantages of low cost and high controllability.

The invention relates to the technical field of acrylic resin, and discloses modified acrylic resin and a preparation method thereof, a transfer coating and a transfer film. The modified acrylic resin is prepared from the following components in parts by weight: 30 to 70 parts of a component A and 30 to 70 parts of a component B, wherein the component A comprises the following components in percentage by weight: 20-30% of adamantyl methacrylate; 10%-15% of long carbon chain acrylate; 5%-10% of a hard monomer; 1%-2% of a vinyl monomer; the component B comprises the following components in percentage by weight: 10%-15% of adamantyl methacrylate; 15%-20% of long carbon chain acrylate; 5%-10% of a hard monomer; and 5%-10% of a vinyl monomer. The comprehensive performance of the modified acrylic resin is improved, meanwhile, the problem that an aluminized layer is prone to corrosion and falling off under damp and hot conditions is solved, and practical application of transfer paint and transfer films is facilitated.