34results about How to "Quarantine direct contact" patented technology

The invention discloses a production method of a graphene-aluminum composite, and belongs to the field of metal-matrix composites. Aluminum alloy powder with the semisolid temperature interval and graphene are adopted as raw materials. The method mainly includes the steps of 1, chemical nickel plating of the graphene; 2, mixing; 3, pressing; and 4, semisolid extruding. According to the graphene-aluminum composite produced through the method, the wettability and the metallurgical bonding strength of the nickel-plated graphene and aluminum alloy are high, the nickel-plated graphene is uniformly distributed in the matrix aluminum alloy, the microstructure is compact, the specific strength and the specific stiffness are high, and the thermal conductivity and the electrical conductivity are good. Thus, the graphene-aluminum composite has wide application prospects in the fields of the national defense and military industry, aerospace, electricity and heat exchange.

The invention discloses a three-dimensional spherical silicon-carbon composite negative electrode material and a preparation method therefor, and belongs to the field of the lithium ion battery negative electrode material. The composite negative electrode material consists of graphite, silicon and amorphous state carbon, wherein graphite and silicon are coated in the amorphous state carbon. The preparation method comprises the steps of dispersing nanometer silicon and a carbon source into an organic solvent, performing spray drying to obtain a Si@C precursor, and performing carbonization to obtain a Si@C material, wherein the volume expansion effect of silicon can be effectively relieved by the surface carbon layer; and next, dispersing the Si@C material, graphite and the carbon source into the organic solvent, performing spray drying to obtain a silicon-carbon composite negative electrode material precursor, and performing carbonization to obtain the three-dimensional spherical silicon-carbon composite negative electrode material. By virtue of the dual-layer amorphous state carbon layers, the volume expansion effect of silicon in the charge-discharge process can be effectively relieved; the amorphous state carbon layer on the outer layer has small specific surface area, so that high irreversible capacity loss is avoided; and therefore, the obtained material has relatively high specific capacity and initial efficiency and excellent cycling stability.

The invention discloses a lithium ion battery with adoption of secondary electrolyte injection, comprising a positive pole, a negative pole, a diaphragm, an electrolyte and an outer package. In the process of manufacturing the battery, the secondary electrolyte injection is adopted; the electrolyte solvent in the first electrolyte injection is one or a combination of more than one of EC (ethylene carbonate), PC (propylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), Gamma-BL (butyrolactone), MF (methyl formate), MA (methyl acetate), EP (ethyl propionate) and THF (tetrahydrofuran) and does not contain acetonitrile and propionitrile; the secondary electrolyte injection is conducted after the formation; and the used electrolyte in the secondary electrolyte injection contains at least one of the acetonitrile and the propionitrile. The electrolyte containing the at least one of the acetonitrile and the propionitrile has the advantage of high normal-temperature conductivity (10-50mS/cm) and low-temperature conductivity (4-20mS/cm at the temperature of -20 DEG C), thereby exceeding the level of an existing electrolyte.

The invention relates to the technical field of sagger kiln furniture preparation, and provides a double-layer structure sagger for a lithium battery positive electrode material and a preparation method of the double-layer structure sagger. The double-layer structure sagger for the lithium battery positive electrode material comprises a base body layer and a surface coating. The preparation method of the double-layer structure sagger for the lithium battery positive electrode material comprises the steps of premixing aggregate, processing and forming, mixing and pulping a surface coating, drying, sintering at high temperature and the like. The sagger with the double-layer structure for the positive electrode material of the lithium battery, which is prepared by adopting the method, has good corrosion resistance of resisting erosion of Li<+>, Co<2+> and the like, is high in cycle use frequency, long in service life, relatively small in thermal expansion coefficient, excellent in thermal shock resistance and certain in bearing strength, the positive electrode material is easy to peel off when being in contact with the sagger, the sagger is not peeled off in the use process, no slag falling and no pollution is generated, the product is an ideal improved product of the current cordierite-mullite sagger, is suitable for the sintering process of various lithium battery cathode materials, and is beneficial to reducing the production cost and improving the economic benefit.

The invention relates to the field of new plastic materials, and specifically relates to a PC composite material used for laser direct forming and a preparation technology thereof. The PC composite material used for laser direct forming is prepared from the following components in parts by weight: 50 to 80 parts of PC, 10 to 50 parts of basalt fiber, 3 to 8 parts of a laser additive, 0.5 to 2 parts of an antioxidant, 0.2 to 2 parts of a heat stabilizer, 3 to 8 parts of a flexibilizer, 1 to 2 parts of a lubricating agent, 1 to 2 parts of a coupling agent and 2 to 6 parts of a compatilizer; the antioxidant consists of a hindered phenol antioxidant and a phosphite ester antioxidant; the heat stabilizer consists of a metal compound, a layered double hydroxide and an ultraviolet absorber; and the laser additive is nano-copper powder modified through acrylic ester. The PC composite material used for laser direct forming disclosed by the invention is high in laser-induced electroplating performance, high in heat and oxygen resistant performance, high in aging-resistant performance and high in mechanical performance.

The invention provides an anti-blocking super-critical water oxidation reactor. The anti-blocking super-critical water oxidation reactor comprises a reactor drum, and a reactor drum cover covering the reactor drum. The reactor drum cover is provided with a feed inlet, the bottom of the reactor drum is provided with a reactant outlet. The anti-blocking super-critical water oxidation reactor also comprises at least one partition extending horizontally in the reactor drum, an area above the partitions is a super-critical water oxidation area, and an area below is a sub-critical area. A heating sleeve is arranged on the outer side of the drum body of the super-critical water oxidation area. The outer side of the drum of the sub-critical area directly contacts with the air. The partitions are provided with holes communicated with the super-critical water oxidation area and the sub-critical area. Innovatively, the partitions can divide the inside of the reactor into the super-critical water oxidation area and the sub-critical area, the problem of blockage of the sediment salt to the outflow pipelines is solved, and the novel anti-blocking super-critical water oxidation reactor is provided.

The invention discloses a novel graphene-based flexible enhanced Raman substrate. The flexible substrate comprises a single layer of graphene having a metal plating with a thickness of 1-100 nm; the metal plating is coated with a polymer and comprises a plurality of island-shaped particles; and the sizes of the particles are in a range of 10 to 1000 nm and the spacing among the particles is in a range of 2 to 500 nm. The graphene-based flexible enhanced Raman substrate of the invention quantitatively monitors Raman molecules in a solution on line by employing the novel two-dimensional atomic layer material graphene and utilizing the novel graphene as a substrate of a shell layer, so the application of shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) to the field of Raman quantitative analysis is broadened.

The invention relates to a method for packaging a Ni-P substrate and belongs to the technical field of electronic packaging. According to the method for packaging the Ni-P substrate, after 5-20 wt % of nano nickel powder and 80-95 wt % of scaling powder are evenly mixed, an Ni-P substrate is coated or printed with the mixture and then is coated or printed with tin-based solder, and then the substrate to be welded is obtained; the substrate to be welded is placed in a static magnetic field, and then reflow soldering is conducted, wherein the gradient of the intensity of the static magnetic field is 3-5*104 G/m, the magnetic induction intensity of the position where the substrate is located ranges from 1000 G to 2000 G, and the magnetic field source is located on the inner side of the Ni-P substrate. According to the method for packaging the Ni-P substrate, the Ni-P wear rate is greatly reduced when welding points are on service, growth of intermetallic compounds is restrained, and layering or stripping of the interface intermetallic compounds is also avoided; the reliability of the welding points is higher, cost is low, production efficiency is high, the technical stability is excellent, and the method is suitable for large-scale industrial application.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for avoiding thermal runaway of a lithium ion battery. The method comprises the following steps: (1) surface activation of raw vermiculite powder: grinding raw vermiculite into powder, cleaning the raw vermiculite powder, dynamically soaking the cleaned raw vermiculite powder in an acidic solution or an alkaline solution, carrying out solid-liquid separation, and drying the material; (2) preparation of a dispersion liquid: fully mixing and dissolving a solvent, a surfactant, a dispersingagent and a binder, adding raw vermiculite powder, uniformly stirring, and then adjusting the viscosity of the slurry to 1000-20000 mPa.S; (3) coating and baking. By adopting the method, the safety performance of the lithium ion battery can be improved, and the thermal runaway phenomenon is avoided.

The invention provides a household sewage ecological purifier structurally comprising a purification box, a side fixed groove, a water inlet connector, a water outlet, an upper sealing cover, side buckle pieces and an interlayer quick changing device; the interlayer quick changing device is arranged in the purification box; the side buckle pieces are mounted on the left and right side surfaces ofthe purification box in an embedded manner; the water outlet is formed in the middle of the front end surface of the purification box. According to the invention, when the sewage purifier is used fortreatment, a closed treatment box body can be formed by combining an inner top cover and an interlayer liner mechanism; a plastic packaging inner film is taken out and replaced, air in the interval ofthe plastic packaging inner film is pumped out through a bottom pull cover to be packaged again, replacement of the plastic packaging inner film inside is completed, and thus the best state of a treatment cavity inside the purifier can be achieved with extremely low cost.

The invention relates to a method for improving the surface friction wear performance by changing the surface grain direction, belonging to the field of surface friction wear performance. The method comprises the following steps of: planning the surface of No.45 carbon steel to obtain the surface with the roughness of Ra3.2; carrying out hardening and tempering treatment, heating a workpiece to 840 DEG C and preserving the temperature for 2h, then fast placing the workpiece to a 10% saline solution for cold quenching, carrying out high-temperature tempering treatment on the workpiece after completely quenching, and preserving the temperature of 560 DEG C for 1.5h to obtain the No.45 carbon steel with the hardness of about 35HRC; finally processing the workpiece to form a specimen with the length 22mm*width 20mm*height 4mm; and then carrying out a friction wear test and setting a 0-90 DEG change between the surface grains of the specimen and the motion direction of a friction pair to respectively obtain a relation between the grain direction and the grinding crack depth as well as a relation between the grain direction and the friction coefficient, wherein the friction wear test is carried out on a multifunctional friction wear tester, and the setting time is 300S.

The invention relates to a root canal length measuring instrument startup and shutdown circuit with a power switching function. The circuit comprises a power switching circuit, a power switch circuit, a switch driving circuit, a key circuit, a target board and a power adapter, wherein an input end of the power switching circuit is connected with the power adapter, an output end of the power switching circuit is connected with one input end of the power switch circuit, the other input end of the power switch circuit is connected with common terminals of the switch driving circuit and the key circuit, an output end of the power switch circuit is connected with a power input end of the target board, a single-chip microcomputer control signal end of the target board is connected with one input end of the switch driving circuit, the other input end of the switch driving circuit is connected with the power adapter, and a key detection signal end of the target board is connected with an output end of the key circuit. With the adoption of the circuit, startup is quick, and safety and power-saving effects can be realized during shutdown; the service life of a rechargeable battery is prolonged, and the safety degree of the rechargeable battery is increased; direct contract of a human body with a power supply is isolated, and the use safety degree is increased.

The invention discloses a gradient single-crystal positive electrode material. The chemical formula of the single-crystal positive electrode material is LiNi<x>Co<y>A<1-x-y>O2@mLiZO<c>, wherein 0 < x < 1, 0 < y < 1, 0 < x + y < 1, 0 < m < 0.05, 0.3 < a < = 10, 1 < = b < 4, and 1 < = c < 15; and A is at least one of Mn, Zr, Sr, Ba, W, Ti, Al, Mg, Y and Nb, and Z is at least one of B, Al, Co, W, Ti, Zr and Si. The atomic proportion of the Co on the surface of the single-crystal positive electrode material particle to Ni + Co + A on the surface is greater than 0.4 and less than 0.8, and the atomic proportion of Co at a position which is 10% radius depth away from the surface of the single-crystal positive electrode material particle is not less than 0.3. The single-crystal positive electrode material is good in particle sphericity and free of sharp corners. The invention also provides a preparation method and application of the gradient single-crystal material.

The invention discloses an angle grinder provided with a dustproof cover. The angle grinder comprises a main angle grinder body and a cutting wheel, and the dustproof cover is arranged on the side face of the main angle grinder body. The angle grinder is reasonable in structural design, and the dustproof cover can effectively prevent the hands from being injured by various fragments generated whenthe cutting wheel of the angle grinder works.

The invention relates to hidden protecting film filming solution, which is characterized in that the invention comprises water solution of chitin chitosan element whose weight ratio is 1% to 10%, and PH value of the solution is 6 to 8, the degree of deacetylation of the chitin chitosan is 50% to 99%, and the average molecular weight is 2 million. The solution can further comprise 2-sulfonic acid sodium-1 and 4-naphthalene methoxy polymer. A layer of protecting film which clings to skin is quickly formed after the hidden protecting film filming solution is smeared on the skin. The invention has the protective function of inhibiting virus such as HIV, and herpes and the like, and inhibiting microbial infection, which has the function of wiping oil, and delaying skin aging and the like.

The invention relates to an emulsion for an inorganic silicate coating, which comprises the following components in parts by mass: water, an emulsifier, polymer colloid, a cross-linking monomer, acrylic acid, butyl acrylate, octyl acrylate, styrene, ammonium persulfate, vinyltrimethoxysilane, tert-butyl hydroperoxide, an FF6M reducing agent, ascorbic acid and potassium hydroxide. The invention relates to a preparation method of emulsion. The preparation method comprises the following steps: S01, preparing pre-emulsified liquid in a monomer bottle; S02, adding water into a reaction kettle, stirring, adding an emulsifier and a polymer colloid, and dropwise adding an emulsion and a second initiator aqueous solution; S03, adding a tert-butyl hydroperoxide aqueous solution, adding an FF6M reducing agent aqueous solution; S04, adjusting the PH value; and step S05, adding a defoaming agent and a bactericide. Therefore, the emulsion has good compatibility and storage stability with inorganic silicate.

The invention discloses a new cultivation method of paulownia seedlings. The method includes following steps: S1, selecting, proportioning and treating a nutritional matrix; S2, collecting seed roots;S3, burying the roots; S4, cultivating, hardening seedlings, and transplanting, wherein compound nutrients include nitrogen, phosphorus and potassium elements, trace elements and compound amino acid,the nitrogen element is urea, the phosphorus element is potassium dihydrogen phosphate, the potassium element is potassium sulfate, the trace elements include calcium, magnesium, zinc, copper and iron which are added in a soluble compound form, and the compound amino acid is composed of alanine, arginine, cystine, glycine, lysine and proline. A standardized cultivation greenhouse and a standardized treatment process are adopted, so that a farming method of field cultivation is broken through, occupied area is reduced, lesion probability of the paulownia seedlings is lowered, seedling cultureperiod is shortened, and yield is increased.

The invention provides a metal hot piercing glass lubricant and a metal hot piercing method. The metal hot piercing glass lubricant comprises glass powder, an inorganic lubricant, a grinding agent and a separant, wherein the inorganic lubricant is one or more of boron nitride, graphite and molybdenum disulfide; and the grinding agent is carbide and/or oxide with the Mohs hardness larger than 6. By adopting the glass lubricant provided by the invention, the abrasion of a guide plate caused by high-speed rotation of a red hot rod blank in a metal hot piercing process is effectively reduced, and the phenomenon that slipping is easily caused after pure glass powder is hot-melted and spread is avoided, so that the metal hot piercing process is smoothly carried out, and direct or indirect economic loss caused by abrasion of the guide plate is effectively reduced.