17results about How to "Microstructural stability" patented technology

The invention provides a cellulose composite carbon aerogel and a preparation method thereof, and the cellulose composite carbon aerogel is prepared by taking cellulose nanofibers and carbon nanotubes as raw materials, mixing and dispersing the raw materials through dispersoid, and then preparing cellulose nanofiber / carbon nanotube composite carbon aerogel through bidirectional freezing, freeze drying and high-temperature carbonization. The invention also provides an application of the cellulose composite carbon aerogel in the aspect of a battery electrode, and the cellulose composite carbon aerogel has an ultra-large specific surface area and an excellent compression ratio under ultra-low density, and shows super-hydrophilicity, high electrochemical activity, good compression resilience, good structural stability and certain mechanical strength; and the method can be used for various electrochemistry-based water-based flow batteries. The invention solves the technical problem that the existing cellulose carbon aerogel is poor in compressibility and mechanical strength, and belongs to the technical field of batteries.

The application discloses a kind of enhanced Sn-Ag-Cu low silver lead-free solder and its preparation method and application, and the specific components of enhanced technical scheme are as follows: Cu: 0.5%~1.0%, Ag: 0.1%~1.0%, La: 0.002%~1.2%, Ge: 0.002%~1.3%, Co: 0.001%~1.2%, and the rest is Sn, calculated by mass percentage. Under the joint action of the added elements, the microstructure of the solder can be improved, thereby effectively enhancing the creep resistance of the solder, greatly improving the fatigue life of the solder at high temperature, and significantly improving the reliability of the solder.

The present invention relates to the field of material science and metal processing technology, and discloses a high-strength and toughening heat treatment process for thick-walled forgings for pressure vessels, comprising the following steps: S1, selecting a low-alloy steel material containing a specific proportion of vanadium, molybdenum, manganese, silicon and nickel; S2, gradually preheating the forging in a furnace to 450°C to 500°C, and continuously heating for 2 hours; S3, heating the forging to 870°C to 920°C, and adjusting the holding time according to the thickness of the forging to ensure that the heat is fully penetrated; S4, carburizing treatment is performed at 680°C to 720°C for 8 to 12 hours; S5, using oil for rapid cooling, and then air cooling to room temperature. The present invention significantly improves the hardness and toughness of the forging, while enhancing its corrosion resistance and fatigue life, and optimizing the microstructure of the material, so that the forging is suitable for the field of pressure vessel manufacturing with high requirements.

The invention discloses a nitrogen-doped silicon-oxygen-carbon negative electrode material of a lithium ion battery as well as a preparation method and application of the nitrogen-doped silicon-oxygen-carbon negative electrode material, and belongs to the technical field of negative electrode materials of lithium ion batteries. The preparation method of the nitrogen-doped silicon-oxygen-carbon material comprises the following steps: carrying out acidic hydrolytic condensation reaction on gamma-methacryloxypropyltrimethoxysilane, and carrying out rotary evaporation, washing and drying to obtain a polysiloxane precursor; and performing high-temperature pyrolysis on the polysiloxane precursor in a nitrogen-containing atmosphere to obtain the nitrogen-doped silicon-oxygen-carbon negative electrode material. According to the nitrogen-doped silicon-oxygen-carbon negative electrode material for the lithium ion battery, the content of nitrogen in silicon-oxygen-carbon is controlled by adjusting conditions such as pyrolysis atmosphere, pyrolysis temperature and pyrolysis time, so that lithium ion storage sites are innovatively enriched from the atomic scale, and the ion and electron transmission capability of the silicon-oxygen-carbon material is improved; therefore, the electrochemical properties such as the first-circle coulombic efficiency, the reversible capacity, the rate capability and the long cycle stability of the silicon-oxygen-carbon material are remarkably improved.

The application discloses antibacterial and bacteriostatic polyester non-woven fabric and a preparation method thereof, and belongs to the technical field of polyester non-woven fabric. The method comprises the following steps: taking the polyester non-woven fabric, carrying out alkali immersion, acid immersion and polydopamine coating to obtain pretreated polyester non-woven fabric; dipping the pretreated polyester non-woven fabric in an antibacterial liquid for finishing and baking to obtain the antibacterial and bacteriostatic polyester non-woven fabric; the antibacterial liquid is composed of a tannic acid solution, a hydrosulfite and antibacterial particles; the antibacterial particles are obtained by compounding and calcining graphene oxide / KH550 modified nano silicon dioxide and zinc-doped titanium dioxide sol to obtain r-GO / SiO2 / Zn-TiO2, and then in-situ reducing silver ions by using bamboo shoot extract; and the antibacterial and bacteriostatic performance of the polyester non-woven fabric is improved.

The invention discloses impregnant asphalt for a carbon / carbon composite material and a preparation method and application of the impregnant asphalt. The preparation method comprises the following steps that S1, asphalt raw materials are put into a reaction kettle to be heated and melted, and the melted raw materials are conveyed into a first-stage reaction kettle to be subjected to condensation polymerization; s2, standing and settling a reaction product after the polycondensation reaction, cutting out a sinking material from the bottom, and taking an upper-layer light material as a master batch for impregnant asphalt; and S3, feeding the upper-layer light material into a second-stage reaction kettle, and carrying out condensation polymerization reaction to obtain the impregnant asphalt for the carbon / carbon composite material. The production process is efficient and stable, the quality is controllable, industrial production can be realized, the preparation cost is low, the preparation period is short, and the carbon / carbon composite material produced by using the impregnant asphalt is stable in microstructure and high in controllability.

This invention discloses a high-temperature resistant and creep-resistant asbestos-free composite sealing board and its preparation method. The board is made from raw materials comprising 30-50 parts inorganic fibers, 10-20 parts high-temperature resistant organic fibers, 25-45 parts high-temperature resistant functional fillers, and 8-18 parts composite binder. The composite binder is pre-mixed from liquid phenolic resin and nano-silica sol at a dry weight ratio of 1:(0.5-2). The board has a localized inorganic reinforcing network formed by the accumulation and curing of nano-silica sol in the pores and interfaces of the fiber network. The preparation method includes: fiber dispersion and pulping, composite slurry preparation, wet paper forming, supplementary impregnation and pre-curing, segmented hot pressing curing, and post-heat treatment. This invention, by combining an organic-inorganic composite bonding system with a specific process, significantly improves the board's resistance to compression creep and sealing durability at high temperatures, solving the technical problem of easy loosening and leakage of traditional asbestos-free sealing materials under extreme conditions.

The invention discloses a non-fullerene receptor with vertical space confinement crystallization (VSC) characteristics and a preparation method and application thereof. The non-fullerene receptor comprises an asymmetric oligopolyethylene glycol side chain (OEG). The non-fullerene acceptor (AT-beta2O) has high acceptor crystallinity and can be used for constructing an active layer with good vertical phase separation (an acceptor phase is enriched near a cathode interface). The unijunction OSCs prepared on the basis of a VSC non-fullerene receptor shows excellent film thickness independence within the active layer thickness range of 100 nm to 400 nm. The advantages pave the way for preparing high-efficiency large-area components. In addition, the non-fullerene receptor with the VSC has strong interaction with other receptor molecules, so that the operation stability of the device is enhanced. Moreover, the non-fullerene acceptor with the VSC has good compatibility with different active layer systems, solvents, processing methods and post-treatment processes, so that the non-fullerene acceptor shows excellent general performance of the acceptor.

The invention provides a preparation method of a high-same-circle-degree SWRH82B wire rod, and belongs to the technical field of wire rod manufacturing. The preparation method comprises the following steps that S1, cleaning is conducted; s2, heating; s3, rolling; s4, air cooling; and S5, aging treatment. Through multi-stage heating treatment, the uniformity of the material is improved; an advanced controlled rolling and controlled cooling technology is used for rolling, so that a more uniform microstructure and higher strength are obtained; a Stelmor air cooling line is adopted for multi-stage cooling, so that the phase change of the material is effectively controlled, the internal stress is reduced, and the formation of a poor microstructure is avoided; through fine aging treatment, the aging time is shortened, and the reliability and the performance consistency of the material are improved; according to the method, through comprehensive process optimization, the same-circle strength of the SWRH82B wire rod is improved, and the mechanical property wire rod meeting the requirement is prepared.

This invention belongs to the field of piezoelectric materials and discloses a lead nickel tungstate-lead zirconate titanate piezoelectric ceramic and its preparation method. The general chemical formula of the lead nickel tungstate-lead zirconate titanate piezoelectric ceramic of this invention is: xPb(Ni 1 / 2 W 1 / 2 )O3-yPbZrO3-(1-x-y)PbTiO3+zwt%MnO2; where, 0.05

The invention relates to the field of ceramic materials, in particular to a preparation method of a high-thermal-conductivity aluminum nitride tape-casting green body and a ceramic chip thereof, and the high-thermal-conductivity aluminum nitride tape-casting green body is prepared from the following raw materials in parts by weight: 100 parts of aluminum nitride powder, 1.5-3.5 parts of a dispersing agent, 8-12 parts of a binder, 3-6 parts of a plasticizer, 1-5 parts of a sintering aid and 80-100 parts of water. According to the invention, due to the low hydrolytic property of the slurry, the uniform distribution of the sintering aid and the optimized sintering schedule, the thermal conductivity of the obtained ceramic wafer is stabilized at 200W / (m.K) or above, the ceramic wafer has a uniform and compact microstructure, the bending strength can reach 450MPa or above, and the requirement of high-end application on mechanical reliability is met.

The present invention provides a method for preparing a three-dimensional structure electrode without a conductive agent and a binder, comprising the following steps: preparing a porous silicon microsphere product with a surface coated with graphene oxide; grinding the obtained porous silicon microsphere product and sodium alginate in a mortar, and then mixing them with a gelatin solution to form a uniform slurry and coating it on a copper foil; and then 3 ) 2 The solution is sprayed on the obtained copper foil, and allowed to stand at room temperature to completely crosslink, and finally freeze-dried and calcined to obtain a three-dimensional structure electrode. The three-dimensional structure electrode without a conductive agent and a binder prepared by the method of the present invention effectively maintains the continuous and stable microstructure of the electrode material, and the carbon network derived from the composite of biomass gelatin and sodium alginate and the highly conductive metal Cu particles synergistically enhance the conductivity of the material. The preparation process is simple, low-cost and pollution-free, providing a new idea for preparing electrodes without conductive agents and binders.

The invention relates to the technical field of mortar materials, in particular to environment-friendly 3D printing mortar and a preparation method thereof. The 3D printing mortar is prepared by the preparation method. The preparation method comprises the following steps: respectively preparing dry powder and mixed liquid; the dry powder is prepared from the following raw material components in parts by weight: 250 to 400 parts of ordinary Portland cement, 30 to 250 parts of sulphoaluminate cement, 25 to 75 parts of ALC powder, 400 to 600 parts of quartz sand, 20 to 60 parts of expanding agent and 2 to 8 parts of fiber; uniformly mixing the raw material components in the dry powder to prepare the dry powder; the ALC powder is powder obtained after reinforcing steel bars are removed from ALC solid waste; uniformly mixing the dry powder and the mixed solution to obtain the environment-friendly 3D printing mortar. According to the method, the ALC solid waste can be recycled, the problem that the ALC solid waste needs to be treated urgently is solved, and the 3D printing mortar material with improved compactness, mechanical strength and heat resistance can be prepared.

The invention relates to the technical field of high-temperature filtration, and discloses a novel direct-writing type 3D printing high-strength mullite porous ceramic which comprises the following raw materials in percentage by mass: 20-40% of aluminum oxide powder; 10%-30% of silica fume powder; 0.5%-2% of trisodium citrate; 0.5%-2% of hydroxypropyl methyl cellulose; 30% to 50% of polymethyl methacrylate microspheres; and 5%-15% of mullite fiber cotton. The porous structure of the mullite porous ceramic is formed by decomposing polymethyl methacrylate microspheres in the sintering process, the particle size D50 of the aluminum oxide powder is 0.5 mu m, the particle size D50 of the silica fume powder is 0.2 mu m, the mass ratio of aluminum oxide to silica fume is 1.35: 1, and the fiber diameter of the mullite fiber cotton is 3-5 mu m. By adding the polymethyl methacrylate microspheres into the ceramic slurry, the microspheres are decomposed to form a pore structure in the sintering process, and the pore diameter and porosity can be adjusted through the particle size and content of the microspheres, so that the ceramic can adapt to different application requirements.

The present application discloses a positive electrode active material and a preparation method thereof, a battery and an electrical device. The preparation method comprises: adding a lithium source, a manganese source, a vanadium source, an iron source and a phosphorus source into a liquid medium, mixing, and obtaining a positive electrode active material precursor solution; transferring the positive electrode active material precursor solution into a hydrothermal reactor in an oxygen-free gas atmosphere for reaction, cooling and filtering, washing, drying and crushing to obtain a powder material; in an oxygen-free gas atmosphere, by chemical vapor deposition, the surface of the powder material is coated with a carbon source, and the positive electrode active material is obtained after crushing. The positive electrode active material prepared by this method has a small particle size and uniform distribution, excellent performance, high quality and stable structure, and has a high voltage platform and energy density, which solves the problem of low voltage platform of currently commonly used positive electrode active materials such as lithium ferrous phosphate and low conductivity of lithium manganese iron phosphate.

The invention provides a preparation process for improving the stability of raw coconut milk, which comprises the following steps: breaking shells of coconuts to obtain meat, grinding and squeezing the meat to 200-400 meshes to obtain crude coconut milk, and degreasing the crude coconut milk through carbon dioxide extraction equipment; then, pH-electron beam circulation is adopted, the pH value is adjusted in stages, heating is conducted, and electron beam irradiation is conducted. Blending raw coconut milk, adding coconut water, a stabilizing agent, an emulsifying agent and a sweetening agent into the crude coconut milk, and stirring; and finally, carrying out homogenization treatment and pasteurization on the raw coconut milk. Wherein the irradiation dose of the electron beam is 8-15 kGy, and the output energy is 10-30 MeV. The stabilizer comprises xanthan gum, carrageenan, guar gum and the like, the emulsifier is sucrose fatty acid ester or monoglyceride, and the sweetening agent comprises sucrose, fructose, xylitol and the like. According to the process, the stability of the raw coconut milk can be remarkably improved, phenomena such as layering are reduced, the taste, texture and nutritional value are improved, the shelf life is prolonged, and the process has relatively high market competitiveness.

The invention discloses a CuSnNi-based high entropy alloy nanopowder for CO2 electrocatalytic reduction. The high entropy alloy of the invention is based on a CuSnNi ternary alloy, and non-precious metal elements Bi and Fe are added to the system. A liquid phase reduction method is used to synthesize a high entropy alloy nanopowder with uniform element distribution, small particle size and narrow distribution width. The high entropy alloy nanopowder has the advantages of high specific surface area, rich void structure, multiple active sites, stable microstructure, good dispersibility and low preparation cost. When applied to CO2 electrocatalytic reduction, it exhibits high catalytic activity and excellent stability under weak alkaline conditions, and the obtained products are rich in variety.