149 results about "Nano copper" patented technology

The invention relates to the technical field of conductive copper paste, in particular to conductive copper paste prepared by combining liquid nonferrous metal with graphene and a preparation method of the conductive copper paste. The preparation method comprises the following steps: weighing nano-copper coated graphene composite powder, a liquid nonferrous metal, a binder, trifluoropropyltrimethoxysilane, an auxiliary agent and copper powder, and then preparing trifluoropropyltrimethoxysilane into a dilute solution; copper powder and the nano-copper coated graphene composite powder are mixed to obtain composite powder; the liquid nonferrous metal and the composite powder are stirred to obtain metal paste; and adding a resin solution and an auxiliary agent into the metal paste to form printing paste, and then standing and curing. According to the conductive copper paste, the liquid nonferrous metal serves as a main binding phase, the defect that the welding thrust is low due to a traditional resin system is overcome, the problems of dispersion and interface compatibility are solved through cooperation of the nano-copper-coated graphene and the silane coupling agent, and finally the conductive copper paste with extremely low resistance, high stability and ultrahigh welding thrust is obtained.

The invention discloses copper paste, an electrode and a preparation method and application of the electrode, the electrode comprises copper powder, the copper powder comprises nano-copper particles and flaky copper powder, the nano-copper particles comprise at least two connected copper nanoparticles, and the adjacent copper nanoparticles are connected in a surface contact mode. According to the electrode disclosed by the invention, the nano-copper particles formed by connecting more than two copper nano-particles are filled in the gap areas among the large-size flaky copper powder, so that the nano-copper particles are in direct contact with the flaky copper powder, conductive channels among the conductive particles are smoother, and the structure of the electrode is more compact due to the filling of the nano-copper particles; the bulk resistance of the electrode is greatly reduced and is equal to the conductivity of a silver electrode; the nano-copper particles can also be used as an auxiliary adhesive after being sintered and cured, so that the adhesive force between the copper grid line and the solar cell is improved, and the connection between the grid line and the solar cell is firmer.

The invention provides nanoscale superfine copper powder and a preparation method thereof, and belongs to the technical field of metal powder, the preparation method comprises the following steps: dispersing copper salt and a complexing agent in deionized water to obtain a copper salt solution; dispersing a reducing agent and a dispersing agent in deionized water to obtain a reducing solution; dispersing sodium hydroxide in deionized water to obtain a sodium hydroxide solution; the method comprises the following steps: heating a copper salt solution, a reduction solution and a sodium hydroxide solution to 45-80 DEG C, adding the reduction solution into the copper salt solution under a stirring condition, then adding the sodium hydroxide solution to obtain a mixed solution, and reacting for 2-3 hours; and after the reaction is finished, a suspension containing copper powder is obtained, and after solid-liquid separation, washing and drying are conducted, the nanoscale superfine copper powder is obtained. The method is simple in technological process, does not need special equipment and is suitable for industrial production. And the prepared nano copper powder is good in dispersing performance, uniform in particle size distribution, high in purity and suitable for being applied to the field of microelectronic components.

The invention relates to lead-free glass-coated copper powder for an HJT photovoltaic cell, conductive copper paste and a preparation method of the lead-free glass-coated copper powder and the conductive copper paste, the glass-coated copper powder comprises nano-copper powder and a coating layer on the surface of the nano-copper powder, and the coating layer is composed of bismuthate glass. According to the preparation method, a sol-gel method is adopted, the bismuthate glass is coated on the nano copper powder, the glass and the copper powder form a core-shell structure, the glass can be molten into a liquid phase during sintering, the contact between the glass and the copper powder is more uniform, and the oxidation resistance of the copper powder is enhanced. The prepared glass-coated copper powder can effectively isolate the copper powder from being in contact with an external oxidizing agent, excellent anti-oxidation protection is provided, the rapid oxidation point of the copper powder is increased by 100-150 DEG C compared with the rapid oxidation point of the copper powder before coating, and the service life of the copper powder is prolonged; meanwhile, the conductive copper paste has high stability, high reliability, low cost and high conductivity, and meets the environmental protection requirement.

The invention relates to an additive for improving refrigeration efficiency of liquid water and a production process thereof, and belongs to the technical field of water additives. The additive comprises 70-80 parts by weight of a carrier, 3-6 parts by weight of modified sophorolipid, 1-2 parts by weight of sodium polyacrylate and 0.5-1.5 parts by weight of sodium molybdate, the carrier is of a core-shell structure, the core of the carrier is nano-copper, and the shell of the carrier is hydrophilic mesoporous silica doped with carboxylated carbon nanotubes; according to the additive prepared by the invention, the refrigeration efficiency of water is improved through the interaction among the carrier, the surfactant and liquid water.

The invention discloses a nano-copper-zinc bimetal organic framework, a nano-drug material, a preparation method and application. The structural formula of the nano-copper-zinc bimetal organic framework is shown in the specification. According to the nano copper-zinc bimetal organic framework disclosed by the invention, through the synergistic effect of two metal ions, the structural stability and biocompatibility of a material can be optimized, and the material is endowed with multiple biological functions; the method is suitable for preparing nano-drug materials.

The invention discloses an antistatic teflon sleeve and a preparation method thereof. The antistatic teflon sleeve is prepared from the following components in parts by weight: 80-95 parts of teflon resin, 5-20 parts of a core-shell structure conductive filler, 1-3 parts of a compatilizer, 0.5-2 parts of a flexibilizer and 0.1-0.5 part of an antioxidant. The outer protective layer is prepared from the following components in parts by weight: 70 to 85 parts of ethylene-tetrafluoroethylene copolymer, 5 to 15 parts of modified nano silicon dioxide, 5 to 10 parts of fluororubber, 1 to 3 parts of antistatic aid and 0.1 to 0.5 part of ultraviolet absorbent. Through the design of the core-shell structure conductive filler, the core layer nano copper powder provides high conductivity, the shell layer PVDF has good compatibility with the Teflon base material, the surface modification layer further enhances the interface bonding force, the volume resistivity of the inner layer base material is reduced, and the antistatic requirement is met; the conductive filler is uniformly dispersed in the base material instead of a surface coating, so that the antistatic performance failure caused by friction or bending is avoided, and the antistatic performance is lasting and stable.

The invention discloses a preparation method of a functional current collector. The preparation method comprises the following steps: step 1, heating and reacting raw materials containing a polyamide raw material, a copper source compound, a catalyst and a reducing agent in an inert atmosphere at 180-220 DEG C for 1-3.5 hours; heating and reacting for 1 to 2 hours under the condition of 230 to 265 DEG C; after the reaction is finished, vacuumizing to-0.07 to-0.08 MP to form a polyamide nano-copper composite material; 2, stirring the polyamide nano-copper composite material to prepare a thin film, so as to obtain a conductive base film; 3, grinding the surface of the conductive base film in an inert atmosphere, and removing dust; and 4, carrying out electroplating treatment on the ground conductive base film, and covering the surface of the conductive base film with a metal coating to obtain the functional current collector. According to the invention, polyamide and metal particles are compounded, water electroplating is directly carried out, and a magnetron sputtering process is not needed. And compared with the traditional magnetron sputtering and water-adding electroplating process for manufacturing the functional current collector, the process yield is improved.

The invention discloses composite lithium-based lubricating grease containing nano-copper and a preparation method of the composite lithium-based lubricating grease. The invention relates to a preparation method of composite lithium-based lubricating grease containing nano-copper. The preparation method comprises the following steps: adding nano-copper particles into lithium-based base grease according to a certain ratio to obtain a mixture; the addition amount of the nano-copper particles is 0.5 wt%-2wt% of the composite lithium-based lubricating grease containing the nano-copper; carrying out primary mixing on the mixture; and then grinding the mixture to obtain the composite lithium-based lubricating grease containing the nano-copper. The nano-copper particles are added into the lithium-based base grease, and the nano-copper particles form a conductive network in the lubricating grease, so that the resistivity of the lubricating grease is effectively reduced, current can be conducted away through a plurality of channels, the situation that the current centrally breaks down an oil film is avoided, and electric corrosion is inhibited from the source.

The invention relates to a battery cell manufacturing and welding process, in particular to a process for completing battery cell welding at low temperature, which comprises the following steps: (S1) pretreatment: removing impurities on a welding surface; (S2) preparing nano-copper brazing slurry; (S3) coating the nano-copper brazing slurry, namely coating the nano-copper brazing slurry on a welding area; (S4) welding is conducted, specifically, the welding areas of the welding workpiece are aligned, the areas coated with the nanometer copper brazing slurry are heated, and inert gas is introduced for protection in the heating process; (S5) cooling treatment is conducted, specifically, after welding is completed, a welding area is rapidly cooled; and (S6) welding detection is carried out to determine whether welding requirements are met. The battery cell manufacturing and welding process disclosed by the invention can realize low-temperature welding.

The application discloses a kind of perfluoropolyether nanocomposite grease and preparation method thereof, belong to the technical field of lubricating material.The lubricating grease includes perfluoropolyether base oil, polytetrafluoroethylene thickener and composite nano additive, wherein the composite nano additive is composed of surfactant modified antiwear additive, structure stabilizer, rust and oxidation inhibitor.Antiwear additive is one of nano copper, nano cerium oxide, nano titanium oxide and molybdenum sulfide, structure stabilizer is one of nano silicon oxide and porous alumina, and rust and oxidation inhibitor is nano zinc oxide.The composite nano additive is introduced in the form of perfluoropolyether oil phase dispersion, and is homogenized with thickener under the condition of 150~260℃ after dispersion and mixing.The application realizes the synchronous improvement of lubricating grease wear resistance, colloid stability, rust and oxidation resistance and oxidation stability through the synergistic effect of various nanomaterials, and is suitable for harsh working condition environment such as high temperature, high load, high vacuum and strong corrosion.

This invention belongs to the field of oil and gas well exploration and development technology, specifically relating to a high-temperature sealing thread grease for oil casing and its preparation method and application. The thread grease comprises the following components in parts by weight: 33-58 parts base grease, 10-40 parts magnetic fluid, 1-5 parts polyethylene glycol, 5-10 parts phosphate ester, 4-10 parts fumed silica, 3-18 parts graphite, 1-5 parts nano-molybdenum powder, 1-5 parts nano-copper powder, 6-12 parts zinc powder, 10-30 parts lead powder, 5-10 parts alkylphenol resin, 5-15 parts acrylic resin, 5-15 parts polytetrafluoroethylene, 10-18 parts diisocyanate, 10-18 parts polyurethane, 10-12 parts tetraethylene glycol dimethacrylate, and 6-11 parts nitrile rubber. This invention ensures good lubricity while maintaining excellent sealing performance under high-temperature conditions.

A microwave-assisted treatment method for decorative metallic wood and its preparation includes: subjecting wood to constant humidity treatment and microwave irradiation treatment; adding surface-modified nano-copper to a molten low-melting-point metal at a temperature 20-30°C higher than the alloy melting point to obtain a composite metal; subjecting the composite metal to high-speed shear emulsification to obtain a composite emulsion containing metal composite droplets; causing in-situ condensation on the surface of the composite droplets to form urea-formaldehyde resin microcapsule wall material, thereby obtaining metal microcapsules constituting a microencapsulated low-melting-point metal / nano-copper composite; adding the metal microcapsules to a KH550 aqueous impregnation solution to prepare a metal microcapsule impregnation solution; immersing the microwave-irradiated wood in the metal microcapsule impregnation solution for impregnation treatment; and subjecting the impregnated wood to microwave irradiation to induce microcapsule rupture and directional release of metal, thereby obtaining microwave-assisted treated decorative metallic wood. This yields decorative metallic wood with controllable metallic luster, uniform distribution, and strong adhesion.

The application discloses a high-pressure quick connector based on precipitation hardening stainless steel and a production process thereof, and belongs to the technical field of materials. In the production process, carbon-coated NbC-Cu functional carbide is added as an additive. The carbon-coated NbC-Cu functional carbide contains a nano copper phase. Through low-temperature solid solution and aging treatment, two kinds of precipitated phases can be generated. One is a B2-NiAl precipitated phase in high-coherent relation with the matrix, and the other is an FCC-Cu precipitated phase in incoherent relation with the matrix. The high-pressure quick connector can generate phase transformation induced plasticity caused by the martensite transformation of austenite in the deformation process, and the FCC-Cu precipitated phase can capture the hydrogen evolution as an effective hydrogen trap to reduce the diffusible hydrogen content in the matrix to the maximum extent, thereby reducing the hydrogen embrittlement sensitivity while ensuring the good mechanical properties of the high-pressure quick connector.

The invention belongs to the technical field of electrochemical electrode materials, and particularly relates to a multilevel structure bismuth oxide-cuprous oxide composite electrode and a preparation method and application thereof.The preparation method comprises the following steps that 1, nano-copper powder and a polymer binder are added into an organic solvent to be mixed, and a porous copper substrate electrode is obtained through stirring, casting, drying and cutting; (2) taking the porous copper substrate electrode as a working electrode, carrying out constant-current anodic oxidation in an alkaline solution, and carrying out in-situ growth to form a Cu (OH) 2 nanowire; (3) under the protection of inert gas, carrying out heat treatment on the Cu (OH) 2 nanowire to convert the Cu (OH) 2 nanowire into Cu2O, and coating a conductive substrate with the Cu2O to form a Cu2O electrode; and (4) performing constant-potential electrodeposition in an electrolyte containing Bi < 3 + > by taking the Cu2O electrode as a working electrode to obtain the bismuth oxide-cuprous oxide composite electrode. Bi2O3 is deposited on a Cu2O substrate, and an interface synergistic effect is generated.

The invention discloses a preparation method of high-purity monodisperse spherical nano-copper powder, nano-copper powder and application of the nano-copper powder. The preparation method comprises the following steps: mixing copper sulfate, aliphatic diamine of which the complexing stability constant logK is 9.0-11.0 and polyvinylpyrrolidone of which the molecular weight is 5000-50000 Da in deionized water to form a uniform dispersion liquid; after heating, slowly dropwise adding 80% hydrazine hydrate at a specific stirring rate for reduction reaction; and finally, separating, purifying and drying to obtain the nano copper powder. Through the synergistic effect of the specific complexing agent and the dispersing agent, under the high concentration of 0.5-0.7 mol / L, the copper ion reduction rate and crystal nucleus growth are precisely regulated and controlled, and the high-quality spherical nano-copper powder with the purity larger than or equal to 99.5%, the sphericity larger than or equal to 0.9 and the particle size distribution span value Span smaller than or equal to 0.5 is successfully prepared. The preparation process is simple, mild in condition and easy to industrially amplify. The obtained nano copper powder is regular in morphology and excellent in dispersity, and has wide application prospects in the fields of conductive slurry, conductive ink, catalysts, heat-conducting and wear-resistant composite materials and the like.

The application discloses a kind of biological coating with physical mechanical antibacterial and chemical antibacterial performance and preparation method thereof, it is related to biomaterial technical field.The biological coating of the application is composed of TC4 nanofiber network and nano copper deposited in nanofiber network, and the preparation method is: using polishing-washing-sweeping process pretreatment TC4 titanium alloy;It is placed in alkali solution and heated in water bath to activate, and the alloy after activation is repeated polishing, washing, sweeping step, to obtain the substrate to be sputtered;The substrate is magnetron sputtered, and nano copper is deposited on its surface;After depositing nano copper, the substrate is annealed in inert atmosphere and cooled, and the biological coating with physical mechanical antibacterial and chemical antibacterial performance is prepared.The synergistic effect of the biological coating composed of nano copper and nanofiber network can effectively kill staphylococcus aureus, escherichia coli and other pathogenic microorganisms, and can be applied to oral implant, metal implant biomaterial as functional coating.

The invention provides an insecticide based on nano-copper and application of the insecticide in prevention and treatment of agricultural and forestry diseases and pests, and belongs to the field of nano-material preparation technology and agricultural and forestry disease and pest prevention and treatment. The invention aims to solve the problems of residue pollution and pest resistance of the traditional chemical insecticide at present, and prepares nano-copper particles by co-culturing bacillus amyloliquefaciens and copper nitrate, and the main component of the nano-copper particles is Cu4O3. By disturbing the feeding capacity and nutrient absorption of fall webworms, efficient killing of target pests is achieved, and the median lethal concentration (LC50) is 15.77 mg / g. The method is environment-friendly, efficient, low in cost and simple to operate, provides a new thought for sustainable control of agricultural and forestry pests, and is suitable for popularization and application.

This invention discloses an ultra-small size copper nanoparticle powder and a green and controllable synthesis method. This invention pioneers a novel reaction pathway combining "one-step direct reduction with alkaline ascorbic acid" with three-stage programmed temperature control. By precisely controlling the reaction temperature and rate from monomer formation to nucleation and final growth stages, it achieves the green and controllable synthesis of ultra-small size copper nanoparticle powder with an average particle size of less than 80 nanometers. This invention eliminates the need for a secondary reducing agent such as ferrous sulfate, resulting in a simpler process that meets green production requirements, reduces environmental treatment costs, and offers strong controllability, making it suitable for large-scale industrial production. The prepared copper powder has a metal-based purity of ≥99.9%, high sintering activity, and a sintering temperature 30-80℃ lower than conventional copper powder. It has significant application value in high-density PCB interconnects, third-generation semiconductor packaging, high-precision 3D printing, photovoltaic pastes, flexible displays, and wearable devices.

This invention discloses a low-temperature pressureless sintering copper paste and its sintering process, relating to the field of copper paste sintering technology. By mass percentage, it comprises the following components: 30%–80% nano-silver-coated copper powder, 10%–60% flake-shaped submicron copper powder coated with an organic solderable protective agent, 3%–25% resin binder, and 0.5%–5% additives. The nano-silver-coated copper powder has a core-shell structure, with nano-copper particles as the core. Simultaneously, the nanoscale silver shell layer possesses extremely high surface energy and atomic mobility. Its sintering initiation temperature is as low as 150–200°C, far lower than the sintering temperature of copper, providing a low-temperature sintering driving force for the copper paste. This allows the copper paste to complete pressureless sintering in the low-temperature range of 250–400°C, avoiding damage to thermistor electronic components from high temperatures. The copper paste of this invention combines oxidation resistance, low-temperature sintering capability, high conductivity, and economy, making it suitable for the field of power electronics packaging.

The application discloses a preparation method of an electric contact material and an electric contact, and the preparation method comprises the following steps: adding a graphene oxide dispersion solution into a target dispersion solution to uniformly disperse, so as to obtain a graphene composite material; the target dispersion solution comprises nano copper oxide powder, nano lanthanum oxide powder and a surfactant; the graphene composite material is subjected to removal and reduction treatment, so as to remove the surfactant in the graphene composite material, and a reduced metal composite material is obtained; the metal composite material comprises graphene, copper, copper oxide and lanthanum oxide; the metal composite material is subjected to ball milling treatment, so as to obtain an electric contact composite material containing lanthanum oxide and graphene. According to the embodiment of the application, the lanthanum oxide and the graphene can be uniformly dispersed, so that the electric conductivity and the anti-welding performance of the electric contact material are effectively improved.

The invention provides a preparation method of a three-dimensional porous copper current collector based on gradient partial pressure-segmented heating, and belongs to the technical field of lithium ion battery negative electrode material preparation. A gradient partial pressure environment is constructed in a vacuum tube furnace, a partial pressure gas phase dealloying process is carried out on commercial brass foil, a three-dimensional porous structure is formed on the surface of the brass foil, and the pore diameter of the three-dimensional porous structure is 1-10 microns. In this way, the specific surface area of the copper current collector can be increased, the current density of the surface of the negative electrode is reduced, and growth of lithium dendrites is effectively inhibited. According to the preparation method disclosed by the invention, through cooperative regulation and control of gradient partial pressure and programmed temperature rise, the bottleneck of structure controllability of an existing gas phase dealloying technology is broken through, and the prepared three-dimensional porous nano-copper current collector has remarkable technical advantages and industrialization prospects in the field of lithium metal batteries.

The invention discloses a wireless signal enhancement-oriented nano-copper electromagnetic ultra-transparent glass and a preparation method thereof, and relates to the technical field of electromagnetic regulation and control. Comprising N * M superstructure units, each superstructure unit comprises a glass dielectric layer and a metal pattern layer attached to the dielectric layer, the metal pattern layers and the glass dielectric layers are sequentially arranged to form a transmission array, and transmission phase modulation and beam control are carried out on incident electromagnetic waves. According to the invention, effective attenuation of complex noise is realized, and the precision and adaptability of electromagnetic regulation and control are significantly improved.

The application belongs to the technical field of nanocomposites, and particularly relates to a kind of nano Cu@Sn powder and its preparation method and application. The preparation method of the nano Cu@Sn powder comprises the following steps: S1, under nitrogen protection, ammonia is added to an aqueous solution of copper salt, then a vinylpyrrolidone-vinyl acetate copolymer is added, the temperature is raised, an aqueous solution of hydrazine hydrate is added, stirring is continued, after the stirring is completed, the product is centrifuged under nitrogen protection, washed, and dried to obtain nano copper powder; S2, a complexing agent, a complexing agent, and an antioxidant are dissolved uniformly in a eutectic ionic liquid, nano copper powder is added, stirring is performed until the nano copper powder is uniformly dispersed, a stannous chloride hydrochloride solution is added, stirring is continued, an EVA solution is added, stirring is continued, after the stirring is completed, the product is centrifuged, washed, and dried to obtain Cu@Sn powder. The solder prepared by the application has high mechanical strength of solder joints and excellent high-temperature reliability.

This invention provides a nano-copper liquid metal composite ink, a composite material, and a preparation method thereof. The preparation method includes the following steps: (1) adding nano-copper powder to an acid solution and ultrasonically treating it; (2) adding liquid metal, degassing and stirring to obtain a mixed powder; (3) mixing PVP alcohol solvent with the mixed powder at a mass ratio of 3:8-3:9, stirring twice, and dispersing by sieving to obtain the nano-copper liquid metal composite ink. The composite material obtained by this invention has excellent electrical properties, with a sheet resistance as low as 46 mΩ / sq. and a conductivity exceeding 1.6×10⁻⁶. 6 S / m; at the same time, the material has excellent long-term stability, with the resistance increasing by only 25% within 4 months of being placed at room temperature.

The invention discloses a copper-graphite-nanometer copper oxide three-dimensional interface electrical contact material and a preparation method and application thereof, and belongs to the technical field of electrical contact materials.The copper-graphite-nanometer copper oxide three-dimensional interface electrical contact material is prepared from, by mass, 50-60% of small-size spherical copper powder, 0.5-1% of microcrystalline graphite, 0.5-1% of nanometer copper oxide, 0.5-1% of nanometer copper oxide and the balance copper oxide. According to the carbon content, the copper / nanometer copper oxide / graphite composite powder accounts for 5%-6%, the trace alloy elements account for 2%-3%, the balance is the large-size spherical copper powder, D50 of the small-size spherical copper powder is smaller than 1 micrometer, and D50 of the large-size spherical copper powder is 1-30 micrometers. According to the invention, by elaborately designing the spatial distribution and interface state of copper, graphite and nano copper oxide in the microscopic scale, collaborative optimization of conductivity, mechanical strength and arc performance is realized, and the high-performance, low-cost and environment-friendly electrical contact material is obtained.

The application provides a kind of copper-based hydrotalcite material loading abamectin material and its preparation method and application, belongs to the technical field of pesticide manufacturing.The copper-based hydrotalcite is used as carrier to load abamectin pesticide, wherein the degradation product of copper-based hydrotalcite carrier in plant is nano copper oxide and metal copper ion, which can be used to generate active oxygen and synergize with abamectin fungicide.Especially in the occurrence site of fungal disease, the acid substances such as oxalic acid produced by pathogen can accelerate the degradation of copper-based hydrotalcite carrier, accelerate the transformation of hydrotalcite structure to nano copper oxide structure by responding to the environment pH, generate active oxygen to kill pathogen, so as to achieve the effect of sterilization.At the same time, the copper-based hydrotalcite carrier can mediate the transport of loaded abamectin pesticide to the plant, effectively improve the systemicity of abamectin pesticide, make it efficiently enriched in the main lesion site, and realize the precision control of disease and insect pest.

The invention relates to nano copper paste based on pillararene host-guest interaction and a preparation method and application thereof, and belongs to the technical field of conductive copper paste. The nano copper paste based on the pillararene host-guest interaction is prepared from the following components in parts by weight: 92 to 95 parts of nano copper powder coated with a pillararene supramolecular assembly, 4 to 8 parts of resin, 2 to 6 parts of an organic solvent, 0.1 to 1 part of a thixotropic agent, 0.1 to 1 part of a dispersing agent, 0.1 to 1 part of a coupling agent and 0.1 to 1 part of other auxiliaries. The nano-copper powder coated with the pillararene supramolecular assembly is of a core-shell structure, a host-guest compound serves as a shell, and nano-copper powder serves as a core; the host-guest compound takes glycidyl methacrylate grafted pillararene as a host and benzyltrialkyl quaternary ammonium salt as a guest; and the object is connected with the surface of the nano copper powder through a coordinate bond. The nano copper paste disclosed by the invention has the characteristics of good conductivity, low sintering temperature, strong adhesive force, excellent oxidation resistance and the like.

This invention relates to the field of magnet technology, and in particular to a corrosion-resistant, high-strength magnet material and its preparation method. The corrosion-resistant, high-strength magnet material comprises a magnetic matrix and a polymer filling the pores of the magnetic matrix and coating its surface. The magnetic matrix comprises the following raw material components by mass percentage: 40%-50% neodymium iron boron powder, 5%-10% nano-copper, 3%-7% nano-zinc, 5%-8% nano-cobalt, 1%-5% nano-zirconium, 5%-8% nano-zinc oxide, 6%-10% nano-silicon dioxide, with the balance being nano-iron. The magnet material of this invention exhibits excellent magnetic properties and corrosion resistance.

The invention relates to the technical field of jewelry copper alloy preparation, in particular to high-precision copper alloy casting powder for jewelry, a preparation method and application. The high-precision copper alloy casting powder for the jewelry is prepared from 97.5%-99.5% of imitation gold copper alloy and 0.5%-2.5% of interface modified nano particles through gas atomization. The particle size of the interface modified nanoparticles is less than or equal to 200nm; the interface modified nano particles are nano metal cluster grafted modified silicon nitride and / or monatomic modified silicon nitride; the nano-metal clusters in the nano-metal cluster grafted modified silicon nitride are nano-copper clusters and / or nano-zinc clusters; the monatomic modified silicon nitride comprises a silicon nitride carrier and monatomic metal anchored at defect points on the surface of the silicon nitride, and the monatomic metal is any one of Cu, Zn and Ag. The copper alloy jewelry prepared from the high-precision copper alloy casting powder for the jewelry has a gold-imitating effect and also has good corrosion resistance and color change resistance.