72 results about "Nanocrystalline composites" patented technology

The invention discloses a preparation method of a high-performance polyacrylonitrile-cellulose nanocrystalline composite battery diaphragm, and belongs to the technical field of lithium ion battery diaphragms. The preparation method comprises the following steps: mixing cellulose nanocrystals, polyacrylonitrile and a solvent to obtain a spinning solution; and carrying out electrostatic spinning on the spinning solution to obtain the high-performance polyacrylonitrile-cellulose nanocrystalline composite battery diaphragm, the mass of the cellulose nanocrystal is 1-10% of the sum of the mass of the cellulose nanocrystal and the mass of the polyacrylonitrile; the cellulose nanocrystals are obtained by hydrolyzing sisal hemp cellulose through phosphoric acid. The polyacrylonitrile-cellulose nanocrystalline composite battery diaphragm disclosed by the invention has excellent thermal stability, mechanical property and electrolyte wettability, and has good cycle stability when being applied to a lithium ion battery. Meanwhile, the raw materials of the cellulose nanocrystals are wide in source, low in price and environment-friendly, and the production cost of the diaphragm is reduced by taking the cellulose nanocrystals as one of the raw materials.

The invention provides a nanocrystalline composite oral ulcer film agent as well as a preparation method and application thereof. The nanocrystalline composite oral ulcer film agent comprises a waterproof backing layer and a drug-loading adhesion layer coated on the waterproof backing layer, the drug-loaded adhesion layer comprises a macromolecular hydrogen bond compound formed by a weakly acidic polymer and a nonionic proton receptor polymer, and a nanocrystalline drug. Compared with the prior art, the preparation method has the advantages that the polyacrylic acid polymer and the nonionic cellulose polymer interact to form IPC serving as an adhesion layer film-forming material, the nanocrystals are loaded into the adhesion layer film-forming material, the waterproof backing layer is coated with the adhesion layer film-forming material, and the oral ulcer film agent is prepared after drying and cutting. The obtained film agent has good comfort and adhesive power, shows good drug stability and permeation promotion performance, can be used as a carrier of an oral administration route, prolongs the drug action time and improves the curative effect. The preparation method of the film agent is simple and easy for industrial mass production.

The invention discloses a vacuum diffusion welding pressing plate with a water cooling structure, and relates to the technical field of vacuum diffusion welding pressing plates, the vacuum diffusion welding pressing plate comprises an upper plate and a lower plate, the upper plate and the lower plate are integrally sintered to form the welding pressing plate, the top of the lower plate is provided with a water cooling channel, the welding pressing plate is made of Mo-Si-B alloy, and the water cooling channel is communicated with the water cooling channel. The bottom of the lower plate is provided with array type micro-protrusions, the height of the protrusions is 50-80 micrometers, the diameter of the protrusions is 100-150 micrometers, and the center distance is 200-250 micrometers. The manufacturing method of the welding pressing plate comprises the following steps that S1, Mo-Si-B alloy components comprise, by atomic percent, 10-15% of Mo, 8-12% of Si, 1-3% of B and 0.5-1.5 wt% of ZrO2 or Y2O3 serving as an additive, and S2, mechanical alloying is conducted, specifically, Mo powder, Si powder, B powder, steel powder and an additive are placed in a high-energy ball milling tank and mixed under argon protection, the ball-to-material ratio of the Mo powder, the Si powder, the B powder and the steel powder is (10-15): 1, the rotating speed of the high-energy ball milling tank is 300-400 rpm, the ball milling time of the high-energy ball milling tank is 20-40 hours, and the nanocrystalline composite powder is prepared.

The invention relates to the technical field of electronic component manufacturing, and discloses a method for improving the anti-aging capability of an inductance magnetic core, which comprises the following steps: pretreatment and bottom layer electroplating: performing oil removal and acid pickling activation on the inductance magnetic core, performing nickel electroplating treatment after cleaning, and forming a bottom nickel layer on the surface of the end of the magnetic core; chemical densification deposition: adopting the plating solution in the first aspect, immersing the magnetic core treated in the step (1) into the heated plating solution, and reacting under the condition of not applying impressed current, a Ni-P-B-W barrier layer is deposited on the surface of a bottom nickel layer, an amorphous-nanocrystalline composite structure is constructed on the surface of an electrode through a combined process of bottom nickel electroplating, middle chemical deposition of the Ni-P-B-W compact barrier layer and surface tin electroplating, the barrier layer utilizes the co-deposition effect of phosphorus, boron, tungsten and nickel, the grain boundary defect is eliminated, and the performance of the electrode is improved. And a mutual diffusion path of bottom layer metal and surface layer tin and a permeation channel of an external corrosive medium are effectively blocked.

The utility model discloses steam turbine high pressure cylinder and medium pressure cylinder shaft seal body outer cylinder body spraying heat insulation material heat preservation structure, including base layer, main heat insulation layer, transition layer, ceramic fiber suture line layer, anchor nail, heat reflection layer, ceramic fiber reinforced layer and protective surface layer. Base layer adopts nanometer silane interface agent to spray on the surface of cylinder body, and main heat insulation layer is nanocrystalline composite heat insulation material, and transition layer is composed of metal base layer, ceramic base layer and organic composite base layer, and the multiple suture lines of ceramic fiber suture line layer are orthogonal grid inlay in the surface of main heat insulation layer, and anchor nail top is equipped with barb structure and root installs elastic silicone rubber gasket, and heat reflection layer is the aluminum foil that etches nanometer level groove and is equipped with wave embossing, and ceramic fiber reinforced layer is sealedly installed paraffin, and protective surface layer adopts organic silicon modified acrylic resin material. The structure has solved the problems of easy cracking of heat insulation layer, easy breaking of heat preservation material, unreasonable shaft seal heat preservation and oil touch flammable etc, and has improved heat preservation performance, structural stability and safety.

Disclosed in the present invention is a preparation method for an anisotropic Nd2Fe14B / α-Fe bulk nanocrystalline composite permanent magnet material. The preparation method comprises the following steps: preparing a master alloy; crushing the master alloy into bulks, and, by means of a melt rapid quenching method, preparing amorphous ribbons; grinding the amorphous ribbons to obtain amorphous powder; cold-pressing the powder into bulks; and placing the bulks into a stainless steel mold, and heating and then rolling same, the stainless steel mold being of a plate-shaped structure, and a chamber for accommodating the bulks being formed in the stainless steel mold along the thickness direction thereof. The present invention presses the NdFeB amorphous powder into bulks, embeds same in the stainless steel mold, and performs rolling at a temperature below a crystallization temperature, so as to achieve high-temperature amorphous material crystallization.

The invention discloses a montmorillonite / cellulose nanocrystalline composite film as well as a preparation method and application thereof. The method disclosed by the invention comprises the following steps: firstly, preparing polyether amine D230 modified montmorillonite aqueous dispersion by taking polyether amine D230 as a modifier; and mixing the polyether amine D230 modified montmorillonite aqueous dispersion liquid with the carboxylated cellulose nanocrystal aqueous dispersion liquid, and carrying out solvent exchange to prepare the montmorillonite / carboxylated cellulose nanocrystal hybrid organic solvent dispersion liquid. Finally, a cross-linking agent is introduced to enhance the interface interaction between the montmorillonite and the carboxylated cellulose nanocrystals. According to the preparation method provided by the invention, stable dispersion of montmorillonite is realized by utilizing a dispersion effect of carboxylated cellulose, and lyotropic liquid crystal characteristics of carboxylated cellulose nanocrystals are combined; a montmorillonite filler network with an ordered structure is constructed through a solvent evaporation self-assembly method, so that the high-barrier-property composite film with a brick-mud structure is prepared. The composite film provided by the invention has a wide application prospect in the field of packaging materials.

The invention belongs to the technical field of permanent magnet materials, and relates to a nanocrystalline composite permanent magnet material and a manufacturing method thereof. The nanocrystalline composite permanent magnet material comprises a hard magnetic phase and a soft magnetic phase, the grain size of the hard magnetic phase and the grain size of the soft magnetic phase are independently smaller than or equal to 25 nm; the content of the soft magnetic phase is greater than 40 wt.%; the hard magnetic phase comprises a hard magnetic main phase, the proportion of the hard magnetic main phase in the hard magnetic phase is larger than 50 wt.%, and the hard magnetic main phase is a rare earth cobalt-based hard magnetic phase. The maximum magnetic energy product of the nanocrystalline composite permanent magnet material obviously exceeds the theoretical upper limit of the magnetic energy product of the single-phase hard magnetic material of the hard magnetic main phase. The giant magnetic energy product effect of the nanocrystalline composite permanent magnet material is realized by strictly controlling the raw material ratio and the preparation process.

This invention belongs to the field of hydrogen barrier coating technology, specifically relating to a nickel-phosphorus-based amorphous-nanocrystalline composite hydrogen barrier coating and its preparation method. The coating uses a nickel-phosphorus alloy as an amorphous matrix, embedding a composite nano-reinforcing phase composed of core-shell structured phosphide nanoparticles, molybdenum disulfide-metal hydroxide heterostructure two-dimensional nanosheets, and silane coupling agent-modified hexagonal boron nitride nanosheets. The microstructure exhibits a coexistence of amorphous and nanocrystalline phases, with a small amount of alloying elements added to the matrix. This invention involves the controlled preparation of three composite nano-reinforcing phases, which are then combined with nickel salts and a phosphorus source to prepare a uniformly dispersed composite plating solution. This solution is deposited on a pretreated steel substrate to form an amorphous nickel-phosphorus alloy coating, followed by gradient heat treatment to construct the target microstructure. This coating, through multi-phase synergy, enhances substrate adhesion and hydrogen barrier performance, showing promising industrialization prospects in hydrogen energy storage and transportation, and petrochemical equipment protection.

The invention provides a preparation method of an anti-oxidation coating from inside to outside, which comprises the following steps: A) preparing an MCrAlY alloy layer on the surface of a pretreated matrix, M being one or more selected from Ni, Co or Fe; b) spraying MCrAlY powder and nano ceramic powder on the surface of the MCrAlY alloy layer to obtain a nanocrystalline composite layer; c, the nanocrystalline composite layer is subjected to laser remelting and then cooled, and the anti-oxidation coating is obtained.The compact diffusion barrier layer is prepared through a controllable atmosphere spraying technology, is used for inhibiting easy-to-oxidize elements in a base body from migrating to the surface under the high-temperature service condition and is suitable for high-temperature components such as aero-engine blades and nuclear reactor components.

The invention discloses a two-dimensional carbon plate loaded nanocrystalline composite material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, preparing a solution, dissolving a template agent, a carbon-containing anion agent and a metal salt in a solvent, and stirring to fully dissolve to obtain a mixed solution; s2, placing the mixed solution in a high-pressure reaction kettle by a one-pot method, converting a carbon-containing component in the solution into a two-dimensional carbon plate under a high-temperature condition, performing nucleation growth on metal ions and anions in the solution on the surface of the two-dimensional carbon plate, and after the reaction is finished, separating a solid to obtain a precursor; and S3, calcining: placing the precursor in an atmosphere furnace, adding an active substance into the atmosphere furnace or introducing active gas into the atmosphere furnace, and calcining in a protective gas atmosphere to obtain the two-dimensional carbon plate loaded nanocrystalline composite material. The two-dimensional carbon plate-loaded nanocrystalline composite material has a uniform nanoscale grain size, and has relatively high specific capacity when being used as a lithium ion battery negative electrode material.

The invention provides a layered heterogeneous regenerated aluminum alloy with a self-healing function and a preparation method of the layered heterogeneous regenerated aluminum alloy. The layered heterogeneous secondary aluminum alloy with the self-healing function is composed of a high-strength layer and a high-toughness layer which are alternately laminated, the high-strength layer comprises Al-Ni-Cu-Mg series alloy and has a nanoscale Al3Ni precipitated phase, and the grain size is 1-3 microns; the high-toughness layer comprises an Al-Fe-Si-Zn series amorphous / nanocrystalline composite structure, and the amorphous phase accounts for 40%-50% of the Al-Fe-Si-Zn series amorphous / nanocrystalline composite structure; a Sn / In element concentration gradient transition area is formed at the interlayer interface, and the thickness of the transition area is 300-600 nm. According to the invention, a framework of alternately stacking high-strength layers (Al-Ni-Cu-Mg series) and high-toughness layers (Al-Fe-Si-Zn amorphous / nanocrystalline) is adopted, a nanoscale Al3Ni precipitated phase of the high-strength layers is used for bearing a main load, an amorphous phase of the high-toughness layers disperses stress through a shear band, a Sn / In gradient transition region (with the thickness of 300-600nm) at an interlayer interface relieves stress concentration, a strength-toughness inversion relationship is broken through, and the high-strength and high-toughness composite material is obtained. And high toughness (strength * elongation) is realized, and the performance is greatly improved compared with that of traditional secondary aluminum.

The invention provides a preparation method of a water-proof and oxygen-proof nanocrystal composite material, which comprises the following steps: atomizing and drying a solution I containing a nanocrystal precursor and a polymer to obtain nanocrystal composite particles, dispersing the nanocrystal composite particles in a colloidal solution, ultrasonically and uniformly mixing the nanocrystal composite particles with a solution II containing a water-proof and oxygen-proof polymer, and performing secondary atomizing and drying to obtain the water-proof and oxygen-proof nanocrystal composite material. And forming a polymer protective layer with water and oxygen barrier property on the surfaces of the nanocrystalline composite particles to obtain the water-proof and oxygen-proof nanocrystalline composite material. The nanocrystalline composite material can be dispersed in packaging base materials such as EVA and POE, has high photoelectric conversion efficiency, maintains long-term environmental stability, and remarkably prolongs the service life of a display device. According to the preparation method, the nanocrystalline composite material is prepared by adopting a secondary spray drying process, the destructive effect on the nanocrystalline material in a traditional liquid phase coating method is avoided, the second waterproof oxygen-barrier polymer layer can greatly improve the environmental stability of the nanocrystalline material, and meanwhile, the nanocrystalline material can be prepared with high efficiency and high material utilization rate; and the method is suitable for large-scale production.

The invention provides an amorphous-nanocrystalline composite structure high-entropy nitride film and a preparation method thereof, and relates to the technical field of film materials. A multi-arc ion plating technology and a high-power pulse magnetron sputtering technology are adopted, and the (Ti / TiN...) / (nc-HEAN / a-Si3N4) multi-layer nano composite structure high-entropy film is prepared by regulating and controlling the composition proportion and the structure. The nano-multilayer structure has the advantages that the crack deflects at an interface, the tip of the crack at the interface is passivated, and microcrack initiation and propagation caused by stress concentration are prevented. The nanocrystalline nc-HEAN high-entropy nitride is embedded in the amorphous a-Si3N4, so that a nanocrystalline / amorphous multiphase composite structure is formed. By means of a nano multilayer structure and a nanocrystalline / amorphous multiphase composite structure, the multilayer nano composite high-entropy nitride film with high hardness / high toughness is prepared so as to meet the high-performance application requirements of the modern industrial technology on cutters and grinding tools.

The invention is applicable to the technical field of metal material welding, and provides a duplex stainless steel pipe welding method which comprises the following steps: S1, performing transient eutectic liquid phase diffusion pretreatment on a groove, and forming a nanocrystalline composite activation layer rich in nickel, nitrogen and rare earth oxides in the groove in situ; s2, a microalloyed welding wire with specific components is adopted for welding, and the welding wire contains 0.8 wt%-1.5 wt% of Cu and 0.01 wt%-0.03 wt% of P which are cooperatively added; s3, after welding, interface excitation and high-temperature and high-pressure nitrogen directional penetration cooperative treatment is conducted; the pretreated nanocrystalline composite activation layer and Cu and P in the welding wire are subjected to a synergistic metallurgical reaction during welding, Ni-Cu-P clusters are generated, the phase boundary can be pinned, the structure can be refined, and a welding seam can be purified in situ; meanwhile, the nanocrystalline composite activation layer provides a high-speed channel for subsequent directional permeation of nitrogen atoms, so that a nitrogen-rich strengthening region is formed on the inner wall of the joint; according to the method, the weak area of the fusion line is fundamentally eliminated, homogenization and functional gradient of the joint structure performance are achieved, and the comprehensive performance is improved.

The invention discloses a preparation method of a full bio-based foaming material, which comprises the following steps: S1, dissolving 90-99 parts by weight of L-polylactic acid and 1-10 parts by weight of cellulose nanocrystal grafted D-polylactic acid in an organic solvent a, fully stirring, and desolventizing at 20-80 DEG C to obtain a polylactic acid / cellulose nanocrystal composite material; the length-diameter ratio of the cellulose nanocrystal is 15 to 30; s2, placing the polylactic acid / cellulose nanocrystalline composite material in a press vulcanizer for compression molding to obtain a sheet; and S3, placing the sheet in carbon dioxide gas, heating to a saturation temperature for saturation treatment, then cooling to a foaming temperature, and immediately releasing the pressure to normal pressure for foaming to obtain the full-bio-based foaming material. The full-bio-based foaming material prepared by the preparation method has excellent heat-insulating property and mechanical property.

The invention provides a preparation method of a nanocrystalline composite material with low cost and high performance. Iron-based nanocrystalline powder, FeNi powder and FeSiAl powder are mixed, pressing and heat treatment are carried out after resin insulation coating are carried out, the nanocrystalline composite material is obtained, in the process, through quality control over all the powder, resin insulation coating is carried out after inorganic coating is carried out on the powder, and cooperative control over two-step pressing and two-step heat treatment is carried out, so that the composite material is obtained. The nanocrystalline composite material which is low in cost, high in frequency, low in loss, high in magnetic conductivity and high in direct current bias is prepared, and the nanocrystalline composite material is suitable for high-frequency power electronic equipment in the fields of 5G communication, new energy automobiles, aerospace and the like.

The invention relates to the technical field of high-toughness impact-resistant optical lenses, in particular to a high-toughness impact-resistant optical lens and a preparation method thereof. A high-toughness impact-resistant optical lens comprises a lens base body, a bottom surface layer and a toughness impact-resistant layer, the bottom surface layer and the toughness impact-resistant layer sequentially cover the surface of the lens base body from inside to outside, and the toughness impact-resistant layer is a ZrO2-TiC nanocrystalline composite layer. The toughness and the impact resistance of the optical lens are improved through the anti-impact layer of a multi-layer structure, zrO2 has excellent phase change toughening characteristics, and can absorb impact energy and inhibit crack propagation; the high hardness and chemical stability of TiC further enhance the impact resistance of the composite layer. Through the nanocrystalline composite design, the number of grain boundaries in the material is greatly increased, and crack propagation needs to bypass more grain boundaries, so that the fracture toughness is improved.

The present invention discloses an amorphous nanocrystalline composite lithium metal negative electrode, a preparation method, and an application thereof, and belongs to the field of lithium battery technology. A preparation method of an amorphous nanocrystalline composite lithium metal negative electrode comprises the following steps: (1) polishing a lithium sheet in a drying room, using a mixed target as a sputtering source, placing the sheet in a magnetron sputtering device, and coating the sheet by physical vapor deposition until the thickness reaches 100 nm, thereby obtaining a lithium sheet containing an amorphous alloy layer. The reverse side of the lithium sheet is repeatedly coated with an amorphous alloy layer in the same manner to obtain an amorphous modified lithium metal negative electrode sheet; (2) removing the amorphous modified lithium metal negative electrode sheet, and crystallizing the amorphous alloy layer by nanosecond laser to obtain an amorphous nanocrystalline composite lithium metal negative electrode. The amorphous nanocrystalline composite lithium metal negative electrode prepared by the present invention can significantly improve the cycle performance of a lithium metal battery when used in a lithium metal battery.

The invention provides a ceramic fluorescent nanocrystal composite particle and a preparation method thereof, and the composite particle comprises a semiconductor fluorescent material with a plurality of fluorescent nanocrystals and a ceramic material, the ceramic material is selected from any one or combination of the following materials: (a) silicate, aluminate, titanate, nitric oxide and composite ceramic formed by any combination of the materials; (b) a mixture of two or more different oxide materials selected from any one of silicon oxide, aluminum oxide, titanium oxide, zirconium oxide, zinc oxide, tin oxide, and transition metal oxides; and (c) multiphase ceramic formed by chemical bonding and / or physical mixing of any material combination in (a) and (b). According to the invention, the ceramic fluorescent nanocrystalline composite particle with strong stability and controllable morphology and the preparation method thereof can be provided.

The invention relates to a preparation method of a Pt (Pd)-based high-entropy amorphous-crystal mixed-state nano-alloy catalyst with low noble metal content, which comprises the following steps: in a vacuum environment protected by argon, preparing a high-entropy amorphous alloy master alloy into a high-entropy amorphous alloy strip; and the high-entropy amorphous alloy mother alloy is heated to 340 DEG C in DSC and then immediately stopped, cooling is conducted in the room temperature environment, nanocrystalline particles are evenly separated out from a high-entropy amorphous alloy mother alloy matrix, and the amorphous-crystal mixed state nano-alloy catalyst is obtained. The nucleation and growth behaviors of nanocrystals are effectively controlled in the treatment process, nanocrystal particles evenly separated out of a high-entropy amorphous matrix are obtained, an amorphous / nanocrystal composite structure is effectively constructed, the high-entropy amorphous alloy mother alloy is heated to 340 DEG C in DSC at the same overpotential and then is immediately stopped, and the high-entropy amorphous alloy is obtained. The current density of the cooled catalyst in the room temperature environment is higher, and large-scale application of the nano-alloy catalyst can be achieved.

The invention relates to the technical field of metal composite materials, in particular to a grain heterogeneous tungsten-copper composite material and a preparation method and application thereof. The method comprises the following steps that titanium carbide powder and a first part of tungsten powder are subjected to ball milling treatment, and W-TiC composite powder is obtained; the W-TiC composite powder and the first part of copper powder are subjected to ball milling treatment, and nanocrystalline composite powder is obtained; the remaining tungsten powder and the remaining copper powder are subjected to ball milling treatment, and coarse-grain composite powder is obtained; the nanocrystalline composite powder and the coarse grain composite powder are subjected to ball milling treatment, and mixed powder is obtained; and the mixed powder is sintered, and the grain heterogeneous tungsten-copper composite material is obtained. According to the invention, a grain heterostructure composed of a W-phase nanocrystalline area and a coarse grain area is successfully constructed through a step-by-step ball milling-mixed sintering process. By means of the structure, the composite material can still maintain excellent plasticity and high conductivity while having high yield strength.

The application discloses a kind of high-conductivity insulation halogen-free fireproof special cable and its preparation method and application, belong to cable manufacturing technical field.Cable is from inside to outside by composite conductor layer, inner wrapping tape layer, inner insulation layer, outer insulation layer, shielding layer, outer wrapping tape layer and sheath layer composition;Composite conductor layer is formed by the stranding of multiple composite conductor filaments;Composite conductor filament is from inside to outside by three layers, respectively as: core copper, inner surface layer and outer surface layer;Inner surface layer is 18-32nm thick amorphous-nanocrystalline composite copper layer;Outer surface layer is 35-78nm thick graphene layer.The cable of the application has high conductivity, strong insulation and fire resistance, non-toxic fire resistance and other characteristics.The preparation method of the application significantly improves the conductivity, mechanical strength and high-temperature stability of the conductor through thermal-magnetic-optical multi-field coupling.

The invention relates to the technical field of conductive agents, and particularly discloses water-based composite conductive paste for a silicon-based negative electrode of a lithium battery and a preparation method of the water-based composite conductive paste. The water-based composite conductive paste is prepared from the following raw materials in parts by weight: 5 to 7 parts of carbon nanotube powder, 2 to 4 parts of graphene powder, 0.5 to 1.5 parts of conductive carbon black, 0.6 to 0.8 part of sulfonated polythiophene-cellulose nanocrystalline composite dispersing agent, 0.2 to 0.4 part of hydroxy propyl cellulose, 0.1 to 0.3 part of boric acid ester coupling agent, 0.6 to 0.8 part of glycerol, 0.3 to 0.5 part of carboxymethyl cellulose and 80 to 100 parts of deionized water. According to the water-based composite conductive paste for the silicon-based negative electrode of the lithium battery and the preparation method of the water-based composite conductive paste, the storage time of the conductive paste can be effectively prolonged, sedimentation of the conductive paste is delayed, meanwhile, silicon expansion failure energy can be converted into reversible deformation energy, meanwhile, continuous smoothness of an electron-ion channel is guaranteed, and the cycle life of the silicon-based negative electrode is prolonged.

The invention belongs to the technical field of photoelectric thin film materials, and particularly relates to a full-spectrum transparent conductive thin film material and a preparation method thereof.The thin film material is of a quasi-continuous homologous nanocrystalline enhanced amorphous composite structure and specifically comprises a transparent substrate serving as an amorphous phase, the chemical component of an amorphous area of the transparent substrate is CuSe < 1 + x >, x is 0.8-1, and the chemical component of the transparent substrate is CuSe < 1 + x >, the components of the whole amorphous region are uniform and present an amorphous structure; the invention relates to a copper-based composite material which is characterized in that the copper-based composite material serves as a conductive reinforcing phase of a crystal phase, a crystal region of the conductive reinforcing phase is composed of nanocrystal grains with a space group of Fm-3m, the chemical component of the nanocrystal grains is CuSe (1-y), and y is equal to 0.4-0.6. According to the invention, a copper selenide material is used as a conductive material, so that the material has good transmissivity in a full spectrum and has the characteristic of high conductivity; the quasi-continuous homologous nanocrystalline composite film is formed by carrying out magnetron sputtering, thermal annealing and other post-treatment methods on a copper selenide target material, and integration of full-wave band transparency and conductivity is achieved.

The application discloses a vacuum diffusion welding pressure plate with a water cooling structure, which comprises an upper plate and a lower plate, the upper plate and the lower plate are integrally formed into the welding pressure plate through sintering, a water cooling channel is arranged at the top of the lower plate, the material of the welding pressure plate is Mo-Si-B alloy, the bottom of the lower plate is provided with an array type micro-protrusion, the protrusion height is 50-80 microns, the protrusion diameter is 100-150 microns, and the center distance is 200-250 microns, and the preparation method of the welding pressure plate comprises the following steps: S1, the Mo-Si-B alloy composition is as follows in terms of atomic percentage: Mo is 10-15, Si is 8-12, B is 1-3, and the additive is 0.5-1.5 wt% ZrO2 or Y2O3 as a grain boundary strengthening phase; and S2, mechanical alloying: the Mo powder, the Si powder, the B powder, the steel powder and the additive are placed in a high-energy ball milling tank and mixed under the protection of argon gas to prepare a nanocrystalline composite powder.

The invention discloses a method for preparing an amorphous aluminum-based coating through electric arc spraying and laser remelting and the obtained coating, and belongs to the technical field of material surface engineering. The method comprises the following steps: firstly, preparing a cored wire which takes pure aluminum as a sheath and is internally filled with specific alloy powder consisting of Al, AlNi, Mg, Ti, rare earth elements and the like; then preparing an amorphous aluminum-based coating on the surface of the matrix under the optimized process parameters by adopting high-speed electric arc spraying equipment; and finally, the coating is subjected to scanning treatment through a laser remelting technology, so that pores are eliminated, the structure is improved, and a compact amorphous / nanocrystalline composite structure is formed. Through material design and composite process innovation, the problems that a traditional electric arc spraying coating is high in porosity and insufficient in bonding strength and an amorphous phase is difficult to prepare are successfully solved, the obtained coating has extremely high hardness and excellent wear resistance and corrosion resistance, the process cost is low, efficiency is high, and the method is suitable for large-scale industrial production and has wide application prospects. The method has wide application prospects in the fields of equipment remanufacturing, marine corrosion prevention, aerospace and the like.

The invention discloses a high-permeability nanocrystalline composite transformer iron core material and a preparation method thereof, and the iron core material comprises the following components by weight: 70-82 wt% of alloy powder with a particle size of 20-45 [mu] m; 8-18 wt% of an epoxy resin matrix; the thickness of the boron nitride nanosheet is smaller than 50 nm, and the diameter of the boron nitride nanosheet is 0.5-2 microns; 3-5wt% of a composite system of polytetrafluoroethylene micro powder and aluminum silicate fibers, wherein the weight ratio of the polytetrafluoroethylene micro powder to the aluminum silicate fibers is (0.8-1.2): 1; 2-5wt% of lithium iron phosphate nanoparticles, wherein the particle size of the lithium iron phosphate nanoparticles is 50-100nm; the boron nitride nanosheets, the polytetrafluoroethylene micro powder, the aluminum silicate fibers and the lithium iron phosphate nanoparticles form a multi-scale isolation structure. The preparation method of the nanocrystalline composite transformer iron core material with high magnetic conductivity is used for preparing the iron core material. Through the synergistic effect of the boron nitride nanosheets, the polytetrafluoroethylene micro-powder / aluminum silicate fiber composite system and the lithium iron phosphate nanoparticles, unification of high magnetic conductivity and low eddy-current loss of the nanocrystalline composite iron core material under high frequency is achieved.

The application discloses a kind of detection food aldehyde flavor substance perception gas sensitive sensing electrode and its preparation method and application, it is related to gas sensitive sensing and food detection technical field, to solve the technical problem of low sensitivity, poor selectivity and insufficient stability of existing gas sensitive electrode to food aldehyde flavor substance perception.The application includes: (S1) preparation Co 2+ @ZIF-8 precursor;(S2) pyrolysis conversion into nanocrystalline composite material;(S3) MXene-NH2, with carboxylated composite material, form complex by amidation reaction;(S4) the complex is heated first, then keep warm, finally annealing, obtain ternary composite sensitive material;(S5) ternary composite sensitive material is coated on interdigital electrode, after drying, it is obtained.The gas sensitive sensing electrode obtained by the application is used for high sensitivity, high selectivity perception of aldehyde flavor substance in food, and is suitable for food quality and safety monitoring and flavor evaluation analysis.

The invention discloses a nanocrystalline composite ceramic insulating material and a preparation method thereof, and belongs to the field of nanocrystalline ceramic material preparation. Raw materials of the catalyst comprise the following components by mole percent: 40-50% of SiO2; 30%-38% of CaCO3 (calcium carbonate); 13% to 18% of Na2CO3; 0.5 to 2.5 percent of TiO2; zrO2: 0.5% to 2.5%; 1 to 3 percent of Al2O3; and 0.5 to 4.5% of K2O. The preparation method comprises the following steps: weighing the raw materials according to the proportioning requirement, fully mixing the raw materials, and carrying out ball milling treatment; keeping the temperature of the mixture at 850-950 DEG C for more than 2 hours, then keeping the temperature at the temperature not lower than 1450 DEG C for 60-90 minutes, then pouring the mixture into a preheated brass mold, and keeping the temperature at 500-550 DEG C and annealing for more than 10 hours; heat treatment is carried out in an air atmosphere through a two-step method, heat preservation is carried out at the temperature of 600-650 DEG C for a certain time, then heat treatment is carried out at the temperature of 650-700 DEG C, and the temperature interval between the heat treatment and the heat treatment is 50-100 DEG C. The nanocrystalline composite ceramic insulating material disclosed by the invention has more excellent mechanical strength and dielectric property, and is of great significance in promoting a power transmission and transformation system to develop towards a direction of higher voltage, longer distance and more reliability.