394results about How to "Reliable preparation method" patented technology

The invention relates to a nanometer clay-containing high absorptive hydrogel as well as a preparation method and application thereof. The hydrogel contains an acrylamide monomer M1, a chemical crosslinking agent M2, inorganic nanometer clay M3 and a water soluble biopolymer M4 with use level of 98-50:0-10:2-25:015 in mass percent. The preparation method comprises the following step of: taking M3 as a filler or a reinforcing agent or a physical crosslinking agent and taking M4 as a second component in a water solution to prepare the environmentally-friendly hydrogel with high water soluble dye adsorption property and excellent mechanical property. The method has the advantages of simple and reliable preparation process, no environmental pollution, very strong dye adsorption removal effects and practicability; and the dye adsorption quantity can be adjusted by temperature, pH value, crosslinking degree, dye concentration, nanometer clay or biopolymer variety and use level and a reactant charge ratio. The hydrogel can be used for the fields of weaving and dyeing wastewater treatment, dye adsorption, and the like.

The invention provides a self-assembly preparation method of a noble metal-graphene double-layer composite conductive film. The noble metal-graphene double-layer composite conductive film is obtained by taking noble metal ions or complex ions and graphene oxide as raw materials and adopting a solvent-induced self-assembly method. In the method, the thickness of the noble metal layer, the graphenelayer and the overall film of the double-layer composite conductive film can be regulated and controlled through concentrations and volumes of noble metal ionic solution and graphene oxide solution, and the electrical conductivities of the silver layer and the graphene layer in the double-layer composite conductive film can be regulated and controlled. The invention provides a stable and reliablepreparation method of the noble metal-graphene double-layer composite conductive film which can be applied to an electronic device.

The invention discloses a preparation method of a lithium-ion battery anode material with an oxide coated on the surface, which comprises the following steps of: 1. dissolving an alkaline substance in a solvent to form a solution, and adding soluble salt into the solution under the condition of stirring to form sol; 2. adding a lithium-contained anode material into the sol and stirring to enable a hydrolysate to be uniformly precipitated and adsorbed on the surface of the lithium-contained anode material; 3. drying the lithium-contained anode material with the hydrolysate adsorbed on the surface; and 4. roasting the dried lithium-contained anode material to form the lithium-contained anode material with the oxide coated on the surface. The invention has simple and realizable preparation method, and the energy density, the safety performance and the charge and discharge cyclical stability of a lithium-ion battery can be markedly improved through the lithium-contained anode material with the oxide coated on the surface, which is prepared by the preparation method.

The invention discloses a preparation method of SiO2 aerogel-filled carbon aerogel. The preparation method is characterized by comprising the following steps: (1) preparing carbon aerogel, namely taking resorcinol (R) and formaldehyde (F) as precursors (the molar ratio of R to F is 1 : 2), anhydrous sodium carbonate as a catalyst and carbon foam as a framework, and preparing the carbon aerogel based on the carbon foam; (2) performing acid treatment on the surface of the carbon aerogel, namely mixing H2O2, NH3H2O and H2O according to a volume ratio of 1 : 1 : 5 to form a mixed solution, and soaking the carbon aerogel in the mixed solution under the water-bath condition at 90 DEG C for 1 hour; (3) preparing a SiO2 precursor solution, soaking the carbon aerogel in the precursor solution, ageing and drying to obtain the SiO2 aerogel-filled carbon aerogel. The preparation method is reliable and good in safety; the prepared composite aerogel keeps good performances of the aerogel and improves the mechanical performance of the aerogel; the surface of the composite aerogel is hydrophobic, so that moisture in the air is not easily absorbed and the shrinkage rate is low.

The invention provides a nuclear fuel and a preparation method thereof, wherein, the nuclear fuel takes carborundum as an inert basal body. The carborundum inert basal body nuclear fuel equably disperses fuel globules of zirconia fuel to the carborundum basal body, and the mass number dispersed in the carborundum basal body is 5-35 percent. The nuclear fuel is a column-shaped or ring-shaped ceramic-ceramic complex fuel core block. The nuclear fuel has good thermal conduction performance and irradiation-resistant performance, and the chemical durability is high. The preparation method equably disperses fuel globules of zirconia fuel to the carborundum basal body, and then ceramic complex carborundum inert basal body nuclear fuel of the zirconia fuel globules equably dispersed in the carborundum basal body are formed through rapid agglomeration of electric sparks. The carborundum inert basal body nuclear fuel is the safe and environment-friendly nuclear fuel. The preparation method is simple and reliable.

The present invention is foamed aluminum supported titania catalyst and its preparation process and application, and features that the catalyst has foamed aluminum carrier and nanometer titania or nanometer doped titania on the surface of the carrier. The catalyst has simple preparation process, facile material, excellent stability, high catalytic activity, convenient use and convenient reuse, and may be used widely in various photocatalytic fields for purifying air, purifying water, treating toxic waste water, purifying atmosphere, sterilizing, etc.

The invention belongs to the tissue engineering field, in particular relates to a calcium sulfate composite material and a preparation method and purpose thereof, aiming at providing a calcium sulfate composite material which can be used as bone substitute material. The calcium sulfate composite material is mainly composed of calcium sulfate and a strontium-containing compound, wherein, the mol weight of the strontium accounts for 0.01-0.5 percent of the total mol weight of calcium and strontium. The calcium sulfate composite material creatively compounds the strontium-containing compound into the medical calcium sulfate so as to increase the activity of the material, causes the material to be able to slowly release the osteogenesis promoting element strontium partially during repairing process at the bone defect site. In addition, experiences prove that the calcium sulfate composite material of the invention has fine physical and chemical properties and biocompatibility, can be attached by osteogenesis cells well, and can well repair the bond defect, and is an excellent bone substitute material. The preparation method of the invention is simple and reliable, and has bright application prospect.

The invention discloses a method for preparing a hydrogenated silicon film by utilizing magnetron sputtering. The method comprises the following steps, pretreating a substrate and placing the substrate in a magnetron sputtering filming device; utilizing a plane Si target as a source of Si element; adjusting the power of an intermediate frequency pulse power supply to control the sputtering rate ofthe Si target; utilizing high-purity Ar gas as main ionization gas, and ensuring the effective glow discharge process; and adopting high-purity H2 gas as reaction gas, ionizing the H2, and combiningthe H2 with the Si element, forming the hydrogenated silicon film on the surface of the substrate through deposition, and annealing the film at the temperature of 550 DEG C to 950 DEG C in vacuum to obtain the nano-crystalline / non-crystalline composite structure. The invention achieves regulation and control to microstructure of the hydrogenated silicon film by changing introduction proportion ofhydrogen so as to further change the photoelectric properties of the film. The preparation method is simple and reliable, and the prepared hydrogenated silicon film is hopeful to be applied to solar batteries.

The invention discloses an N-type crystalline silicon double-sided solar cell structure and a preparation method thereof. The N-type crystalline silicon double-sided solar cell structure sequentially comprises a front metal wire, a front local contact metal electrode, a front antireflection film, a front passivation film, a P-type doped layer, an N-type crystalline silicon substrate, an N+ region, a back passivation film, a back local contact metal electrode and a back metal wire from top to bottom, wherein fine metal wires are combined with the local contact metal electrodes through a conductive bonded material to form a conductive assembly capable of replacing a fine grid line of a battery. A main grid line or an electrode lead exports current collected on the front surface and the back surface of the battery. Due to the structure of the battery, the contact area of metal and the silicon substrate is reduced, the composite loss is reduced, the light shading area of the grid lines is significantly reduced, so that the conversion efficiency of the battery is improved, and meanwhile, the production cost is reduced by reducing the dosage of silver paste.

The invention relates to a preparation method and application of a glucose-oxidase-modified mesoporous manganese dioxide composition, and effectively solves the problem of providing new drugs for treating tumor diseases by preparing a glucose-oxidase-modified mesoporous manganese dioxide composition so as to realize synergistic inhibition of tumor cell growth by sonodynamic therapy and starvationtherapy. The preparation method of the glucose-oxidase-modified mesoporous manganese dioxide composition comprises the following steps: modifying surfaces of mesoporous manganese dioxide particles with glucose oxidase through amide bond reaction; physically loading a small-molecular sound sensitizer in pore canals of the mesoporous manganese dioxide, thereby obtaining an internally loaded sensitizer; and then, performing covalent modification on the outer side of the internally loaded sensitizer with glucose-oxidase-modified pharmaceutical composition of mesoporous manganese dioxide nanoparticles. Particle sizes of the glucose-oxidase-modified pharmaceutical composition of the mesoporous manganese dioxide nanoparticles are 100-300 nm; and mass ratio of the glucose oxidase to the manganesedioxide is 1 to 5. The preparation method of the glucose-oxidase-modified mesoporous manganese dioxide composition disclosed by the invention is stable, reliable, and low in cost; and moreover, the glucose-oxidase-modified mesoporous manganese dioxide composition can be used as a magnetic resonance imaging contrast agent for performing real-time monitoring on tumors. Therefore, the glucose-oxidase-modified mesoporous manganese dioxide composition is an innovation in tumor treatment drugs.

The invention relates to a preparation method and application of nano barium sulphate. The preparation method of the nano barium sulphate concretely comprises that barium ions and sulphate ions in specified concentration are added into electrolyte from an anode and a cathode of an electrolysis cell respectively, move at high speed under the action of an electric field by utilizing charged ions and collide to generate barium sulphate precipitate, wherein reaction is quick and intense, then filtering and drying are carried out, so that flaky nano barium sulphate with fine grain size, uniform grain size distribution and stable performance are obtained, and the flaky nano barium sulphate can effectively reflect infrared rays in the sunlight and transmit visible lights when being applied to transparent reflective thermal insulation coating, so that transmitting and thermal insulating functions are realized. The preparation method of the nano barium sulphate is simple, reliable, high in efficiency and good in effect, product quality is stable, and industrial production can be easily realized.

The invention discloses a volume scattering polymer light-guide plate and a method for preparing the injection moulding parent-material thereof. Injection moulding is adopted, the raw materials include organic host materials, inorganic volume scattering particles, coupling agent MPS, anhydrous alcohol and dibutyl phthalate; the inorganic volume scattering particles are SiO2, ZrO2, Al2O3, TiO2 or ZnO, the particle sizes is between 0.1-10 Mum; the organic host materials are poly(methyl methacrylate), polycarbonate or cycloolefin polymers. The process for preparing the injection moulding parent-material of the volume scattering polymer light-guide plate is simple, the batching is easy, and volume scattering polymer light-guide plate can be prepared on a precise injection moulding machine under common injection moulding condition. The volume scattering polymer light-guide plate is fabricated by injection moulding, the preparation method is simple and reliable. The light-guide plate prepared by the method has sound performance, can not only be applied to LED street lamp with relatively low technical requirement, but also applied to LCD screen with very high technical requirement.

The invention relates to a high temperature alloy material for an engine turbine. The high temperature alloy material comprises components according to weight percentage: 0.22-0.28% of C, 2.1-2.2% of Mn, 0.45-0.61% of Si, 18.3-19.2% of Cr, 8.25-10.4% of Mo, 3.50-3.80% of W, 0.05-0.35% of Al, 0.18-0.27% of Cu, 5.0-9.2% of Fe, 1.0-1.1% of B, 3.15-3.45% of Ti, 6.7-8.2% of Co, 0.12-0.18% of Zr, 1.12-1.38% of Nb, and the balance of Ni and inevitable impurities, and a preparation method which is matched with the material is provided. The prepared blank is reasonable in component design, and is matched with characteristics of reasonable thermal processing technology, convenient production organization, strong field operability and strong apparatus universality, so that the quality of the produced high temperature alloy large-sized turbine disk product is high, the structure property meets the standard requirements, the production efficiency is high, and the economic benefit and the social benefit are obvious.

The invention provides a composite forward osmosis membrane. The composite forward osmosis membrane is prepared by compounding a membrane material and a supporting material; the membrane material is mainly formed by compounding a nano silver-loaded nanotube material and cellulose triacetate; the nanotube material is selected from one or more of boron carbide nanotube with hydrophilic groups, titanium dioxide nanotube with super hydrophilicity, and carboxylic carbon nanotube with hydrophilic groups. The composite forward osmosis membrane can improve the water flow rate, achieves high salt rejection capability, and has antibacterial effect. The invention further provides a preparation method of the composite forward osmosis membrane. The method comprises the following steps: firstly performing surface modification on the nanotube materials, and introducing hydrophilic groups; secondly, loading nano silver on the nanotube materials subjected to surface modification; thirdly, pretreating a supporting material; fourthly, preparing a membrane solution; fifthly, spreading the membrane solution onto the supporting material to obtain a membrane after scraping, coating the surface with gel after a solvent is volatilized, so as to prepare the composite membrane.

The invention discloses a preparation method and application of a rhenium disulfide nanoflake. A single-layer and / or few-layer disulfide nanoflake is prepared by mixing a rhenium source with xanthateand carrying out hydrothermal reaction. The method is characterized in that the large-scale commercially-produced xanthate is selected as a sulfur source; the method has good repeatability and low cost, and can be used for preparing the single-layer and / or few-layer disulfide nanoflake. The nanoflake can be applied to the fields of adsorption, photocatalysis, photodegradation, lubrication, photoelectronic devices and the like.

The invention discloses a method for preparing a glucose oxidase-modified metal organic framework pharmaceutical composition, wherein the metal organic framework is cerium-based MOF (Ce-MOF). The method comprises the following steps: carbonizing synthesized Ce-MOF by calcination under protection of nitrogen, modifying glucose oxidase on a surface of the Ce-MOF through an amide bond reaction, and finally physically loading an anti-tumor drug inside the Ce-MOF to obtain the glucose oxidase-modified metal organic framework pharmaceutical composition with a particle size of 150-250 nm. The methodis stable and reliable, and low in cost. The prepared pharmaceutical composition can play a role of triple-strike interactive comprehensive treatment on tumors in preparation of anti-tumor drugs, enhance anti-tumor effect, is an innovation in the anti-tumor drugs, and has huge economic and social benefits.

The invention discloses a neutron filter material and a preparation method thereof. The preparation method comprises 1, orderly carrying out primary compacting molding, sintering and hot isostatic pressure molding on an epithermal neutron filter material, or 2, putting the epithermal neutron filter material into a jacket and carrying out hot isostatic pressure molding, wherein the epithermal neutron filter material comprises at least one of tungsten powder, aluminum powder, titanium powder, boron carbide, titanium oxide, lithium fluoride, aluminum fluoride, gadolinium oxide, gadolinium fluoride, boron nitride, boron oxide, zirconium boride, titanium boride and lithium oxide powder. The neutron filter material has the advantages that 1, the neutron filter material has outstanding filterability and provides a specific energy section and especially provides a neutron beam of an epithermal neutron energy section, 2, the preparation method is reliable, product performances are outstanding, and in boron neutron capture therapy device use, the epithermal neutron filtration satisfies apparatus design indexes, and 3, the large-scale thick neutron filter material can be prepared and machining can be realized.

The invention discloses a molybdenum disulfide nanosheet preparation method which comprises the steps: mixing a molybdenum source with xanthic acid and performing hydrothermal reaction to prepare single-layer and / or few-layer molybdenum disulfide nanosheet. According to the method, xanthate which is industrially produced in a large scale is utilized as a sulfur source, so that cost is low, repeatability is good, and the single-layer and / or few-layer molybdenum disulfide nanosheet can be prepared out. The nanosheet can be applied to the fields of adsorption, photocatalysis, photodegradation, lubrication, photoelectric devices and the like.

The invention discloses a polyvinyl chloride material for manufacturing ping-pong balls and a preparation method thereof. The polyvinyl chloride material comprises the following raw materials in parts by weight: 50-150 parts of polyvinyl chloride, 5-20 parts of nano calcium carbonate, 6-22 parts of solid plasticizer, 3-12 parts of Ca-Zn composite stabilizer, 10-30 parts of flexibilizer and 0.01-0.1 part of pigment. The polyvinyl chloride material is substantially approximate to celluloid ping-pong balls in terms of mechanical properties, particularly of leaping ability and strike resistance, and is also substantially approximate to the celluloid ping-pong balls in terms of appearance and ball striking sense.

The invention provides a polyethylene glycol desulphurization composite film filled with active carbon and a preparation method thereof. The preparation method comprises the following steps: dissolving polyethylene glycol in a mixed solution of ethanol and water, carrying out uniform mixing, then adding active carbon powder and carrying out stirring to realize uniform dispersion; then adding a cross-linking agent and a catalyst, and after uniform mixing, carrying out standing and defoaming so as to obtain a film casting solution; pouring the film casting solution onto a polyvinylidene fluoride bottom film and carrying out knifing; and after volatilization of a solvent, carrying out crosslinking so as to prepare the polyethylene glycol desulphurization composite film filled with active carbon, wherein a mass ratio of polyethylene glycol to the cross-linking agent is (10-20): 1, a mass ratio of polyethylene glycol to the catalyst is (30-35): 1, and the mass of active carbon powder is 5 to 30% of the mass of polyethylene glycol. The preparation method provided by the invention is simple in flow and convenient to operate; the prepared polyethylene glycol desulphurization composite film filled with active carbon has improved permeation flux and selectivity; and better mechanical performance and separation performance of the film can be realized as long as technological conditions are appropriate, so industrial application is realized.

The invention discloses a preparation method of a ternary positive electrode material precursor. By pertinently adjusting the addition time, addition amount and reaction condition of a reactant in a co-precipitation reaction process, the prepared ternary positive electrode material precursor is more uniform in particle size and narrower in particle size distribution, and a ternary positive electrode material prepared from the ternary positive electrode material precursor is better in cyclicity and has an active effect for improving performances of a lithium ion battery; and the preparation method is simple, reliable, low in cost and suitable for large-scale and commercialized production of the ternary positive electrode material precursor.

The invention belongs to polysaccharide with immunological activity, in particular to a franchet groundcherry fruit stem polysaccharide with immunological activity and a preparation method thereof. The method comprises the following steps of: extracting through a water immersion method; precipitating water immersion liquor extract; deproteinizing by using an enzyme method in combination with a Sevage method; drying to obtain rough polysaccharide; eluting with physiological saline; freeze-drying to obtain polysaccharide Q-WSP; and further purifying through HPLC (High Performance Liquid Chromatography) to obtain WSP (Water Soluble Polysaccharide). The molecular weight of the WSP obtained by using the method is about 7,000Da through HPLC measurement and the components are uniform. Monosaccharide components obtained through gas chromatographic analysis are Rha, Ara, Gal, Glc and GalA. The franchet groundcherry fruit stem polysaccharide has an immunological enhancement effect and can be used for foods and health-care products for improving the immunologic function of the organism. The preparation method is simple and reliable. The franchet groundcherry fruit stem has a wide source and is changed into things of value through development and utilization of the franchet groundcherry fruit stem polysaccharide.

The invention relates to a method for preparing a nano aluminum oxide material modified polymer integral column. The method comprises the following steps of: mixing and stirring a functional monomer, a cross linking agent, pore-foaming agents and initiators uniformly by taking glycidyl methacrylate as a functional monomer and taking ethylidene dimethyl acrylic ester as a cross linking agent; pouring into a silylanization quartz capillary, and carrying out polymerization reaction by thermal initiation; flushing with methyl alcohol fully, thereby obtaining a polymer integral column; pouring a nanometer aluminum oxide-sodium hydroxide solution into an integral column, carrying out polymerization reaction by thermal initiation, and flushing with methyl alcohol fully, thereby preparing a nano aluminum oxide material modified polymer integral column. The integral column prepared by the invention has the advantages of both an organic integral column and nano materials; the preparation method is simple and reliable; the materials have stable performances and good permeability; the introduction of the nano materials is beneficial to improving the separation efficiency, is very suitable for analyzing azo-type of pigments of tony red and the like in beverage samples, and has a great application potential in the field of organism separation and solid phase extraction.

The invention discloses a method for preparing a rhenium diselenide nano-sheet and belongs to the field of preparation of a novel two-dimensional nano material. The rhenium diselenide nano-sheet is formed through reducing a rhenium source and a selenium source through hydroxylammonium chloride by utilizing a hydrothermal method, reacting to obtain rhenium diselenide nano-particles and assembling the rhenium diselenide nano-particles. By adopting the method provided by the invention, the disadvantages of an existing preparation process of the rhenium diselenide nano-sheet that a preparation period is long, the cost is high, the operation is complicated and the like are overcome; the method is simple in production operation and good in repeatability and a reaction period is shortened; raw materials for producing are cheap and easy to obtain; the method has moderate reaction conditions, and energy consumption and cost are reduced, so that the method is suitable for large-scale production; the invention provides a reliable sample preparation method for application of the rhenium diselenide nano-sheet in electrical and optical aspects, and provides more potential scientific evidences and technical supports for enabling the rhenium diselenide nano-sheet to become a novel photoelectric material in the future.

The invention relates to an ODS (oxide dispersion strengthened) high-temperature alloy material for an engine turbine. The high-temperature alloy material comprises the following components in percentage by weight: 0.22-0.28% of C, 2.1-2.2% of Mn, 0.45-0.61% of Si, 18.3-19.2% of Cr, 8.25-10.4% of Mo, 3.50-3.80% of W, 0.05-0.35% of Al, 0.18-0.27% of Cu, 5.0-9.2% of Fe, 1.0-1.1% of B, 6.7-8.2% of Co, 0.12-0.18% of Zr, 1.12-1.38% of Nb, 1.2-2.8% of composite oxide Y-Ti-O nanoparticles and the balance of Ni and inevitable impurities. The invention further provides a preparation method of the material. A prepared blank has the characteristics of reasonable composition design, reasonable hot-working process, convenience for production organization, strong production operability and strong equipment universality, a produced high-temperature alloy large turbine disk product is high in quality, the structure properties meet standard requirements, the production efficiency is high, and the economic and social benefits are remarkable.

The invention discloses a cement-based material reinforced basalt fiber special impregnating agent, and a preparation method thereof. The cement-based material reinforced basalt fiber special impregnating agent comprises, by weight, 40 to 60 parts of a film forming agent, 5 to 15 parts of a coupling reagent, 1 to 5 parts of a lubricating agent, 10 to 20 parts of a modifying agent, and 30 to 50 parts of water; the modifying agent comprises a soluble phosphate, a strong base, and a dissoluble silicate at a mass ratio of 2-4:1-3:3-6. The cement-based material reinforced basalt fiber special impregnating agent is used for impregnating and fiber surface modifying at the same time, fiber surface roughness is increased, and a large amount of active site and active groups are formed on fiber surfaces, so that chemical bonding and mechanical riveting of basalt fiber with a cement-based material are realized, an integrated stable whole body is formed by basalt fiber and the cement matrix, reinforcing effect on the cement-based material is obvious, reinforcing effect is excellent, and popularization and application of basalt fiber in the cement-based material is promoted.

The invention relates to a preparation method of a compound oral solid preparation containing Ticagrelor. According to the compound oral solid preparation, the content of Ticagrelor per unit of the preparation is 60-180 mg, preferably 60-90 mg; the content of aspirin or pharmaceutically acceptable salt or ester per unit of the preparation is 35-75 mg, preferrably 35-50 mg. The compound oral solid preparation is prepared from Ticagrelor, aspirin, a pellet core material, an adhesive, a film coating material, an enteric coating material, a diluent, a disintegrating agent and a lubricant. Ticagrelor granules, pellets or tablets and aspirin enteric pellets or enteric tablets are prepared separately, then mixed and bagged, capsulated or tableted, so that the purpose that Ticagrelor and aspirin are not directly contacted in a medicine composition preparation and can thereby keep stable is achieved.

The invention discloses a method for preparing a low-VOC glass fiber reinforced polypropylene halogen-free flame-retardant composite material, which comprises the following steps: firstly drying the raw materials; secondly using a twin-screw extruder to melt and blend to prepare glass fiber reinforced polypropylene respectively Masterbatch and hollow glass microbead masterbatch; then the two are mixed and injected through a single-screw injection molding machine to obtain a low-VOC and low-density glass fiber reinforced polypropylene composite material. The composite material obtained by the preparation method of the present invention can catalyze and degrade the VOC in the car efficiently, energy-savingly and environmentally friendly without external ultraviolet light source or equipment; at the same time, hollow glass microspheres coated with a compatibilizer are added, without reducing the strength of the composite material Under the premise, it has good compatibility with glass fiber reinforced PP and can effectively reduce the density. The preparation method provided by the invention is simple and reliable.

The invention belongs to the technical field of advanced processing for superalloys, and relates to a preparation method for a wrought superalloy fine-grain bar. The preparation method for the wroughtsuperalloy fine-grain bar comprises the following steps: raw material preparation, vacuum induction furnace smelting, vacuum self-consuming re-melting, high-temperature diffusion homogenizing annealing, upsetting and blank preparation, thermal sheathing, sand blasting for a sheathed blank, glass lubricant brushing, extrusion preparation for a bar material, and sheath removal. According to the preparation method for the wrought superalloy fine-grain bar, an upsetting process and an extrusion cogging process are organically combined, and a small-specification ingot case is innovatively adoptedfor preparing the large-specification bar, so that the problems of high process deformation difficulty and difficulty to process and form, of the material, are solved; the bar is fine and uniform in grain structure; the produced complex alloyed wrought superalloy bar product is high in quality, and ideal in microstructure control; the mechanical property is enhanced and improved; and high materialqualification rate and remarkable economical benefits are achieved.

The invention discloses a composite sand core for metal mold casting and a preparation method of the composite sand core for the metal mold casting. The preparation method of the composite sand core for the metal mold casting comprises the steps that firstly, a heat-resistant core head is manufactured from ceramic materials or heat-resistant sand blocks; the core head is placed at a corresponding position in a core box; core sand obtained through even mixing of sand, water and an additive is placed in the core box and compacted; and finally, freezing is conducted, and then the composite sand core is obtained. By the adoption of the composite sand core for the metal mold casting and the preparation method of the composite sand core for the metal mold casting, heat transmitted by a high-temperature metal mold to a frozen sand core body can be greatly reduced, the frozen sand core placed in the metal mold can maintain high strength for certain time, so that metal mold casting technological requirements are met, and it is possible that the environment-friendly excellent-performance frozen sand core can be applied to metal mold gravity casting, low-pressure casting and the like.