16405results about "Material nanotechnology" patented technology

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and a lithium battery, and relates to the technical field of lithium ion batteries. According to the method, the pressing index of the lithium iron phosphate positive electrode material is tested by adopting a specific method, so that the pressing index meets a specific range, meanwhile, the average circularity of larger particles in a Dv50-Dv100 range meets a proper range, the lithium iron phosphate positive electrode material has better particle movement capability, and the particles can move at a higher speed to be rearranged during pressing, so that the particle size of the lithium iron phosphate positive electrode material is reduced, and the quality of the lithium iron phosphate positive electrode material is improved. Therefore, the positive pole piece with high compaction density can be obtained, the charge-discharge capacity of the battery can be improved, and meanwhile, the particles can be prevented from being broken when being pressed, so that the positive pole piece has good anti-pressure capability. By adopting the lithium iron phosphate positive electrode material provided by the invention, the lithium battery has relatively high energy density and capacity retention ratio.

The invention discloses an intelligent defect detection system and a self-repairing method for a flexible base material RFID tag, and belongs to the technical field of Internet of Things electronic device manufacturing. According to the system, a three-dimensional dynamic scanning system is constructed by integrating a high-resolution image acquisition module, a multispectral sensor array and a mechanical arm motion platform, and surface and internal structure characteristics of a flexible substrate are captured in real time. A defect identification algorithm based on deep learning is combined with a multi-scale convolutional neural network and a transfer learning technology, precise classification of 12 types of defects such as microcracks, conductive layer fractures and base material deformation is realized, and the detection precision reaches 99.2%. A dual-mode self-repairing mechanism is put forward, specifically, nano-silver conductive colloid is injected through a microfluid channel for the defects of the conductive layer, and 3D structure reconstruction is achieved through a controllable temperature field; for substrate damage, a photoresponse shape memory polymer patch is adopted, and molecular-level bonding repair is achieved after ultraviolet light activation. According to the scheme, the detection efficiency is improved by more than 5 times, and the radio frequency performance of the tag is recovered to 98.7% of the initial value after self-repairing.

Disclosed are a lithium iron phosphate precursor, a lithium iron phosphate material, a preparation method therefor, and a use thereof. The lithium iron phosphate material comprises a flower cluster structure, the flower cluster structure comprises secondary particles, and the secondary particles are formed by agglomerating primary particles by means of a coating layer; the material of the primary particles is lithium iron phosphate. The lithium iron phosphate material of the present invention has good electrochemical properties and processing properties when used in batteries.

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and particularly relates to a preparation method and application of an Ag-coated NiFe2O4 composite SERS substrate. The preparation method comprises the following steps: firstly, preparing Ag nanoparticles which are uniformly distributed and have the same size through a sodium citrate reduction method; secondly, a nanometer flower type NiFe2O4 material is prepared through a hydrothermal method and a calcination method; and finally, the novel SERS substrate Ag-coated NiFe2O4 is prepared through a physical stirring method. The novel SERS substrate made of the Ag nano particles and the nano-flower type NiFe2O4 material is constructed, and compared with a conventional SERS substrate made of independent Ag nano particles, the SERS substrate can detect stronger intrinsic Raman signals of probe molecules. As the SERS substrate needs to be compounded with a nano-flower type NiFe2O4 material during preparation, a charge transfer phenomenon can occur at an interface where the SERS substrate is in contact with probe molecules, so that intrinsic Raman signals of the probe molecules can be enhanced, and the SERS substrate can be better used for detecting and analyzing chemical substances.

The invention discloses a positive electrode material for a zinc-bromine flow battery and a preparation method and application thereof, and belongs to the technical field of zinc-bromine flow batteries, the preparation method comprises the following steps: crushing and sieving an active carbon source, adding the active carbon source into a graphene oxide aqueous dispersion, stirring, centrifuging, removing supernate, drying, mixing with an activating agent, and activating in an inert atmosphere; washing to be neutral, drying and sieving to obtain a graphene / activated carbon composite material; and attaching the graphene / activated carbon composite material to a carbon-plastic bipolar plate to obtain the positive electrode material for the zinc-bromine flow battery. A graphene / activated carbon composite system is combined with a high-conductivity network, graded holes and surface functional groups, so that the reaction kinetics bottleneck of a traditional carbon material Br2 is broken through.

The invention discloses a lithium battery diaphragm coating based on a nano material and application thereof, and relates to the technical field of lithium battery diaphragms. The coating comprises the following raw materials in parts by weight: 15-25 parts of polystyrene maleic anhydride copolymer modified polyvinylidene fluoride, 10-20 parts of polystyrene, 2-4 parts of nano silicon nitride, 3-6 parts of a boehmite / aluminum oxide and silicon dioxide composite material, 1-2 parts of a dispersing agent and 65-90 parts of a solvent, according to the lithium battery diaphragm coating provided by the invention, the wettability and absorptivity of a diaphragm to an electrolyte are remarkably improved, meanwhile, the lithium battery diaphragm coating also has excellent thermal stability, and the diaphragm can be effectively prevented from thermal shrinkage or melting under a high-temperature condition, so that the safety performance of a battery is remarkably enhanced.

The invention discloses a SnO2 / SnS2 / AgS nano material with piezoelectric electro-catalytic tooth whitening and sterilizing performance and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dripping a silver nitrate aqueous solution into a prepared SnO2 / SnS2 nano material aqueous dispersion, carrying out hydro-thermal treatment for 2 hours, centrifuging, washing and drying to obtain a SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nano material; (2) food indigo is adopted to simulate tooth surface pigments, piezoelectric electro-catalytic degradation is carried out by using the SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nanomaterial, and the pigment degradation efficiency can reach 95% or above; (3) the SnO2 / SnS2 / Ag2S heterojunction nanomaterial is used for piezoelectric electro-catalysis treatment of the streptococcus mutans pellicle, and the antibacterial rate of the pellicle can reach 90% or above; and (4) compared with a 3% H2O2 aqueous solution for treating the enamel surface structure, the SnO2 / SnS2 / Ag2S nano-material piezoelectric electro-catalysis treatment of teeth has small damage to the enamel surface structure. According to the invention, more nano materials with tooth whitening and sterilizing performance and the preparation method thereof are provided, so that the problems of single variety, single preparation method, low electron-hole separation efficiency and large side effect of the existing tooth whitening and sterilizing nano materials are solved.

The invention discloses metal element-doped nano silicon carbon as well as a preparation method and application thereof, and relates to the field of negative electrode materials. The nano silicon carbon takes porous carbon as a carbon skeleton, and the porous carbon is sequentially attached with nano silicon and coated with a carbon material layer through a chemical vapor deposition method; the porous carbon is prepared by carbonizing resin containing metal nitride after alkali activation and pore forming, and the resin containing the metal nitride is prepared by condensation polymerization of a phenolic compound, an aldehyde compound and the metal nitride in the presence of a catalyst. The porous carbon is doped with the metal nitride in the resin polycondensation process, the conductivity of the nano silicon carbon is effectively improved, the powder resistance is reduced, holes in the surface of the porous carbon provide more expansion space for deposited nano silicon, a carbon material layer formed by subsequent deposition and coating provides a protection effect, the reaction between silicon and an electrolyte can be inhibited, and the service life of the nano silicon carbon is prolonged. A stable SEI film is formed, the cycling stability of the material is improved, the volume expansion rate of a pole piece is inhibited, and the cycling life and the stability of the battery are improved.

The invention relates to a silicon-carbon composite material and a preparation method and application thereof.The preparation method comprises the steps that a porous graphite raw material is subjected to acid pickling and smashing to obtain pretreated porous graphite, then the pretreated porous graphite is soaked in a carbon precursor solution in a vacuum mode, carbonization treatment is conducted after centrifugal separation, pores of the porous graphite are filled with carbides, physical activation is conducted, and the silicon-carbon composite material is obtained; the preparation method comprises the following steps: forming pores in a carbide to form a graded pore structure to obtain a porous graphite composite material, then carrying out silicon deposition in a fluidized bed to obtain a uniform nano silicon layer, and then carrying out carbon coating treatment to obtain a silicon-carbon composite material; the graphite with relatively low cost is adopted as a matrix, high capacity and long cycle performance of the graphite-based silicon-carbon negative electrode material are realized through hierarchical pore structure design, carbonization-activation synergistic pore forming and interface deposition process optimization, and the graphite-based silicon-carbon negative electrode material can be applied to the fields of power batteries and high-energy-density energy storage, especially the field of lithium ion batteries and has wide application prospects. The expansion rate of the battery can be reduced, and the specific capacity, cycling stability and safety of the lithium ion battery can be improved.

The invention provides a method for improving the stability of a perovskite nanocrystal, which comprises the following steps: S1, preparing the perovskite nanocrystal: mixing a perovskite nanocrystal precursor and a micro / mesoporous template to obtain a mixture; calcining the mixture under the condition that the collapse temperature of the micro / mesoporous template is lower than that of the micro / mesoporous template, so as to generate perovskite nanocrystals in the pore channels of the micro / mesoporous template; s2, post-treatment by a hydrothermal method; and S2, dispersing the perovskite nanocrystals obtained in the step S1 in a high-pressure reaction device filled with an inorganic fluoride solution, and treating the mixed solution through a hydrothermal method to obtain the perovskite illuminant. According to the method, the stability of the perovskite nanocrystals can be improved without collapsing the micro / mesoporous template.

The invention relates to the technical field of electrochemistry, and particularly discloses a positive pole piece, an electrochemical device comprising the positive pole piece and an electric device. The positive pole piece comprises a first active material with a particle size of 4-20 [mu] m and a second active material with a particle size of 200-600 nm, the first active material comprises lithium manganese iron phosphate with the manganese content of m%, the second active material comprises lithium manganese iron phosphate and / or lithium iron phosphate with the manganese content of n%, and m and n meet the condition that m-n is larger than or equal to 15 and smaller than or equal to 85. According to the invention, by controlling the particle size distribution in the positive electrode active material and the manganese content relationship, the electrochemical device containing the positive electrode plate has excellent fast charging performance and energy density.

The invention discloses a preparation method and application of a zinc-manganese bimetal organic framework derived composite nano-enzyme, and belongs to the technical field of nano-materials. Zinc-manganese bimetal organic framework nanoparticles prepared by reacting ZIF-8 with manganese (III) acetylacetonate are used as a template, and are calcined at different temperatures in a tubular furnace to obtain zinc-manganese bimetal organic framework derivative composite nano-enzymes with different morphologies. The nano enzyme has peroxidase-like activity, glutathione peroxidase-like activity and catalase-like activity, and has a wide application prospect in anti-tumor treatment.

The invention relates to the technical field of alloy coatings, and discloses a laser cladding high-entropy alloy coating and a preparation method thereof.The laser cladding high-entropy alloy coating is prepared from, by mass, 25%-45% of Fe, 15%-25% of Cr, 10%-20% of Ni, 5%-15% of Mn, 3%-10% of Al, 0%-5% of Ti, 1%-5% of a nanometer reinforcing phase and 0.1%-0.5% of a flow promoter. Lorentz force generated by an alternating electromagnetic field drives melt convection, so that the diffusion coefficient of segregation-prone elements such as Cr and Ni is increased, the ultrasonic cavitation effect is matched to crush dendritic crystals and promote dispersion of nanoparticles, the segregation index of the elements is reduced, a uniform nanocrystalline-amorphous composite structure is formed through the synergistic effect, and uniform distribution of elements in a molten pool is achieved.

The preparation method of the silicon-carbon composite material comprises the following steps: uniformly mixing a carbon source, a pore forming agent and a cross-linking agent, and introducing peroxide gas into a tubular furnace for sintering to obtain porous carbon; uniformly mixing the porous carbon with liquid silane and a surfactant, and transferring the mixture into a high-pressure reaction kettle for reaction to obtain a silicon-carbon precursor; and introducing the obtained material into a carbon source gas containing a heteroatom gas for deposition to obtain the silicon-carbon composite material. The obtained material generates porous carbon with high strength and high pore volume by utilizing the cross-linking agent and the pore-forming agent thereof, so that the expansion is reduced; and the liquid silane has the characteristics of low decomposition temperature, low cost and high safety performance, so that the specific capacity is improved, and the cost is reduced.

The invention discloses a wide and thick steel plate for a 600MPa-grade high-performance marine riser and a production method of the wide and thick steel plate, according to the component design of the wide and thick steel plate, CEIIW is controlled to be 0.35%-0.41%, CEPcm is controlled to be 0.14%-0.18%, and beneficial influences on strengthening, phase change, microstructure, steel plate performance and post-welding performance are achieved; on the basis of component design, production methods of low-temperature heating, rough rolling multi-stage thickness section high-temperature gradient deformation and low-temperature rolling, intermediate temperature-waiting blank rapid cooling after rough rolling is finished, finish rolling low-temperature deformation, multi-stage water cooling and the like are adopted to obtain polygonal ferrite and batten bainite; the steel further comprises a small amount of granular bainite microstructures and dispersed fine precipitates, and the average height of deformed austenite does not exceed 15 microns; the problem of matching of comprehensive technical characteristics such as high strength, high toughness, high fatigue performance, corrosion resistance, strain resistance and good welding performance of the wide and thick steel plate for the high-performance marine oil and gas exploitation vertical pipe is solved.

The invention discloses a preparation method of a metal-based nano-enzyme and application of the metal-based nano-enzyme in treatment of periodontitis, the nano-enzyme combines two metal bases, and the nano-enzyme exerts anti-inflammatory, vascularization and osteogenesis effects through advantage complementation to treat periodontitis. The nano-enzyme for treating periodontitis has excellent anti-oxidation / anti-inflammatory performance, exerts an ROS elimination function in a specific environment, responds to a periodontitis pathology microenvironment to release metal ions, exerts a growth factor-like function of the metal ions and realizes repair of blood vessels and bone tissues. The multifunctional nano material has the advantages of simple process, low cost, high activity and the like, and has a good treatment effect on periodontitis.

The invention discloses porous carbon, a silicon-carbon negative electrode material, a preparation method, a pole piece and a battery. The porous carbon comprises a carbon skeleton and calabash-shaped pores distributed in the carbon skeleton, the average pore size of the porous carbon is 0.05-15 nm, and the pore volume is 0.05-2 cm < 3 > / g. The preparation method of the porous carbon comprises the following steps: S1, carrying out melting treatment on a mixture, and filtering; the mixture comprises asphalt-based porous carbon and asphalt, the average pore size of the asphalt-based porous carbon is 0.1-20 nm, the pore volume of the asphalt-based porous carbon is 0.1-2 cm < 3 > / g, and the mass content of quinoline insoluble in the asphalt is 0.003%-3%; and S2, carrying out carbonization treatment on the solid obtained by filtering in the step S1. The porous carbon with most closed pores, small aperture and calabash-shaped pore body structure is beneficial to subsequent silane gas deposition, electrolyte isolation and silicon elementary substance expansion inhibition, and can well cooperate with high first effect and high capacity of a silicon-carbon negative electrode material.

The invention discloses a silicon carbon material, a preparation method thereof and a lithium ion battery. The preparation method of the silicon-carbon material comprises the following steps: S1, adding an alkaline reagent into a mixed solution containing a porous carbon-loaded silicon substrate, transition metal salt and a solvent, and drying to obtain a first precursor; s2, performing carbon deposition on the first precursor by adopting a chemical vapor deposition method, performing in-situ growth of a carbon nanotube, and then performing acid pickling and drying to obtain a second precursor; s3, performing silicon deposition on the second precursor by adopting a chemical vapor deposition method, and forming silicon nanoparticles and / or silicon nanowires in the carbon nanotubes in situ to obtain a third precursor; and S4, carrying out carbon coating on the third precursor to obtain the silicon carbon material. The silicon-carbon material is excellent in expansion inhibition performance and compressive strength and has excellent conductivity, and the lithium ion battery containing the silicon-carbon material can give consideration to excellent capacity performance, rate performance and cycle performance.

The invention relates to the field of electronic detectors, and discloses an ultrafast and efficient electronic detector based on nano polycrystalline boron nitride, which comprises a nano polycrystalline boron nitride scintillator, a light guide and a photomultiplier, and is characterized in that the nano polycrystalline boron nitride scintillator and the photomultiplier are respectively connected with the front end and the rear end of the light guide, a nano polycrystalline boron nitride material of the nano polycrystalline boron nitride scintillator is prepared by taking a sapphire single crystal wafer as a substrate, using NH3 and BCl3 or NH3 and BF3 as raw material gases and adopting a chemical vapor deposition furnace for epitaxial growth. In the invention, the nano polycrystalline boron nitride scintillator has short electron decay time and high scintillation light yield, and can realize ultrafast and efficient electron radiation detection when being applied to an electron detector. The electron detector can be applied to secondary electron and backscattered electron detection in an electron beam detection system, and a new choice is provided for the electron beam detection technology.

The invention provides a nano transdermal delivery system based on superoxide dismutase, the nano transdermal delivery system is of a capsule composite structure of a small molecule active component-superoxide dismutase-polymer shell layer, the small molecule active component is loaded in superoxide dismutase, the surface of the superoxide dismutase is coated by the polymer shell layer, and the superoxide dismutase is loaded in the capsule composite structure. The diameter of the superoxide dismutase-based active ingredient transdermal delivery system is 20-100 nm, and the thickness of the polymer shell layer is 7.5-52.5 nm. In the delivery system, the polymer shell layer provides a protection effect for the superoxide dismutase and the micromolecular functional substances with the anti-oxidation effect, the capsule composite structure is in a nanogel form, and the nanogel not only promotes the penetration depth of the capsule, but also reduces the irritation effect of the capsule on the skin. The raw materials are biologically friendly, the preparation method is simple, the yield is high, and industrial large-scale production can be realized.

According to the high-strength ship plate with the excellent firework performance and the manufacturing method, a low-carbon chemical component system is adopted, V-N, Ti and other refined grain elements are added, formation of a ferritic structure in steel is promoted, RE elements are added, and the purity of the steel is improved; the manufacturing method comprises the steps of smelting, continuous casting, reheating, rolling, accelerated cooling and stacking slow cooling, the rolling process adopts two-stage controlled rolling, the first-stage rolling adopts a high-temperature fast rolling and high-pressure reduction process, and the second-stage rolling adopts a fast rolling process with high finish rolling temperature; the steel plate produced by using the method has excellent comprehensive mechanical properties and fire performance, the yield strength is greater than 485MPa, and the tensile strength is 560-620MPa; the yield strength of the steel plate after fire work is larger than 475 MPa, the tensile strength is 551-610 MPa, the percentage elongation after fracture is larger than or equal to 25.5%, and the impact absorption energy at the temperature of-80 DEG C is larger than 200 J.

The invention relates to the field of microfluid chemical synthesis, and discloses a method for preparing gold nanoparticles based on two-phase flow microfluid control. The method comprises the following steps: 1) converging a gold precursor water phase, a reducing agent water phase and an organic phase in a micro-fluidic chip at 0-25 DEG C to form water-in-oil liquid drops; (2) conveying the fluid to a mixing area channel of a micro-fluidic chip, and carrying out instantaneous nucleation reaction to form a gold nanoparticle prototype; 3) conveying the fluid into a capillary reactor, and further nucleating, growing and curing the gold nanoparticle prototype; and (4) the fluid is subjected to phase splitting, and a gold nanoparticle solution is obtained. A three-in-one micro-fluidic chip is adopted, process parameters are optimized, and a gold precursor and a reducing agent are wrapped in an organic phase before reaction to form water-in-oil liquid drops, so that on one hand, the situation of adsorption and scaling of the inner wall of a channel can be avoided, and on the other hand, the heat and mass transfer efficiency of a material can be improved through the generated liquid drops; and the uniformity of a reaction nucleation environment is ensured.

The invention belongs to the technical field of medical materials, and relates to a titanium-based implant surface dual drug release system and a preparation method and application thereof. Comprising a titanium-based implant and a hydrogel layer attached to the surface of the titanium-based implant, the surface of the titanium-based implant is of a nanotube array structure, zinc oxide nanoparticles and up-conversion luminescent material particles are arranged between the titanium-based implant and the hydrogel layer, and MgO2 nanoparticles are loaded in the hydrogel layer; wherein the material of the up-conversion luminescent material particles is NaYF4: Yb < 3 + >, Er < 3 + >, and the hydrogel layer is composed of gelatin-sodium alginate hydrogel. The titanium-based implant surface dual-drug release system provided by the invention can realize loading of different drugs, can be used for treating various diseases, has a better time sequence control effect, is long in action time and low in cost, and has a wide application prospect.

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a conductive polymer coated silicon-carbon composite material and a preparation method and application thereof.The conductive polymer coated silicon-carbon composite material comprises a porous silicon-carbon material and a conductive polymer, and the pore width of a porous structure in the conductive polymer coated silicon-carbon composite material is smaller than the in-pore width; the porous silicon carbon material comprises porous carbon and silicon particles, the conductive polymer comprises a polymer frame and a conductive material, the conductive material comprises at least one zero-dimensional conductive substance, at least one one-dimensional conductive substance and at least one two-dimensional conductive substance, and the component content of each conductive substance meets the formula: # imgabs0 # mA is the mass percentage of the component A in the whole system, Pc is the mass percentage of the component B in the whole system, and the component B is the mass percentage of the component B in the whole system. A is the mass fraction percolation threshold of the component A in the polymer framework. According to the invention, not only can a screening type structure be effectively constructed, but also the rate capability can be greatly improved, and finally the silicon-carbon composite material with high initial efficiency, low expansion, high cycle stability and excellent fast charging performance is obtained.

The invention discloses a Cu-Cr-Zr-TiB2 copper-based composite material and a preparation method and application thereof. A blank containing TiB2 particles is subjected to rotary forging to obtain a rotary forging piece, the rotary forging piece is subjected to primary aging treatment and then subjected to electric pulse drawing to obtain a drawing piece, and then the drawing piece is subjected to secondary aging treatment to obtain the Cu-Cr-Zr-TiB2 copper-based composite material. According to the Cu-Cr-Zr-TiB2 copper-based composite material prepared through the preparation method, the copper matrix is of a gradient structure with the surface layer being a nanocrystalline layer of 50-200 nm and the core part being fine grains of 0.5-1 micron, TiB2 particle reinforced phases are distributed in the copper matrix in a fibrous mode in the axial direction, and Cr / Zr nano precipitated phases are distributed in gaps of the TiB2 particle reinforced phases and in crystals of the copper matrix in a dispersed mode; therefore, the high-hardness, high-strength, high-conductivity, high-softening-temperature, excellent high-temperature performance and excellent arc extinguishing performance are achieved.

The invention relates to an iridium dioxide catalyst and a preparation method and application thereof, the iridium dioxide catalyst is a material with a three-dimensional porous structure, and the three-dimensional porous structure comprises mesopores and macropores; the characteristic peak of rutile type iridium dioxide exists in the XRD spectrogram of the iridium dioxide catalyst. When the catalyst disclosed by the invention is used as an anode catalyst in water electrolysis hydrogen production, the loading capacity of the catalyst can be effectively reduced, the dispersity is improved, and meanwhile, the catalyst has better mass transfer effect and conductivity, higher catalytic activity and excellent stability.

The invention relates to the field of aluminum materials, and provides an automobile corrosion-resistant aluminum material and a preparation method thereof.The automobile corrosion-resistant aluminum material is prepared from cerium oxide loaded aluminum oxide nanorods, scandium / boron nitride nanotubes, zirconium powder, magnesium powder, copper powder, manganese powder, silicon carbide nanoparticles, TiB2 nanoparticles, aluminum powder and stearic acid. Wherein the cerium oxide loaded aluminum oxide nanorod is composed of an aluminum oxide nanorod and cerium oxide nanoparticles loaded on the surface of the aluminum oxide nanorod, and the scandium / boron nitride nanotube is composed of a boron nitride nanotube and a scandium nanolayer uniformly coated on the surface of the boron nitride nanotube. The material is prepared through mechanical ball milling, cold isostatic pressing forming, vacuum sintering and aging treatment, and finally the aluminum-based composite material containing the Al3Sc nano precipitated phase and the boron nitride nanotube reinforced phase is formed. And an Al3Sc precipitated phase and an aluminum matrix form a coherent interface, so that the strength, the corrosion resistance and the wear resistance of the material are improved. Through nanostructure optimization, high performance of the aluminum alloy is achieved, and the aluminum alloy is suitable for the fields of automobiles, aerospace and the like.

The invention relates to the field of metal surface treatment, and discloses a multi-layer vacuum coating method for enhancing the surface of a high-precision metal part, which comprises the following steps: S1, surface treatment: removing surface pollutants and oxide layers through plasma cleaning, and coarsening the surface of a base material through laser etching; s2, coating deposition is conducted, specifically, a metal transition layer and a multi-layer nano hard coating are deposited in an enhanced mode through plasma; s3, depositing a self-lubricating coating: depositing the self-lubricating coating by pulse laser; s4, post-treatment: carrying out ion beam assisted post-treatment; s5, heat treatment: performing low-temperature heat treatment to eliminate stress. Through the plasma enhanced PVD and pulse laser deposition technology, the multi-layer nano coating is deposited under the low-temperature condition, the problem of thermal deformation of a heat-sensitive metal base material caused by a traditional high-temperature process is solved, and it is ensured that the multi-layer coating with high hardness and high compactness can still be formed on the premise that the size precision of the base material is not affected; and therefore, the method can be widely applied to surface treatment of high-precision parts.