99results about How to "Solve segregation" patented technology

The invention relates to a process for producing an ultra-thick plate and belongs to the field of rolling and producing an ultra-thick steel plate in the metallurgical industry. The invention mainly overcome the defect of producing the ultra-thick steel plate by a traditional model casting manufacturing blank and an electro-slag remelting manufacturing blank. The method comprises the following steps: cutting and fixing lengths of the blanks, mechanically conditioning the blanks (eliminating, leveling and cleaning a single-surface oxide layer of a casting blank with a milling machine, a planer or a shot blast); clamping an assembly (relatively superposing the cleaning surfaces of the two blanks after processing, placing the two blanks oppositely and clamping the blanks); mounting the blanks in a vacuum chamber of an electronic beam welding machine for purpose of vacuuming; sewing the assembly on the electronic beam welding seal edge, heating the assembly in a furnace and rolling the assembly through temperature control; and then producing the ultra-thick steel plate. Compared with the traditional electro-slag remelting production process, the process has the advantages of high production efficiency, reduced electric power consumption, less investment of production devices and low production cost. Compared with the traditional die casting production process, the process solves the problem of segregation and looseness of a large-scale die casting ingot center part; the finished product ratio is high; and the finished product ratio of blank assembly is over 90 %.

The invention discloses a preparation method of a high-voltage lithium cobalt oxide cathode material which comprises the steps: (1) mixing cobaltosic oxide containing doped element M, a lithium source, oxide containing doped element M', a grain refiner and a fluxing agent to obtain a primary mixture; (2) sintering and smashing the primary mixture to obtain primary sintered powder; (3) mixing the primary sintered powder with a coating material to obtain a secondary mixture; (4) sintering and smashing the secondary mixture to obtain the lithium cobalt oxide cathode material. According to the preparation method disclosed by the invention, the problem of microscale segregation of distribution of doped elements in the product is solved by two modes of doped element premixing and dry-method mixing; a coulter type mixing technology is utilized to solve the problem of segregation of different matters in material mixing; the grain refiner and the fluxing agent are combined for use to synthesizea material in a mixed morphology; technologies such as dual effects of doped element surface crystallization catalysis and the coating material and the like are utilized; thus, performance of the high-voltage lithium cobalt oxide is obviously improved.

The invention provides high-performance ocean platform steel and its production method. When the thickness of a steel plate is 8-40mm, the steel plate is composed of the following chemical components, by weight, 0.11-0.13% of C, 0.20-0.50% of Si, 1.45-1.55% of Mn, 0.012% or less of P, 0.003% or less of S, 0.035-0.045% of V, 0.025-0.030% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities; and when thickness of a steel plate is 40-100mm, the steel plate is composed of the following chemical components, by weight, 0.10-0.12% of C, 0.20-0.50% of Si, 1.50-1.60% of Mn, 0.012% or less of P, 0.003% or less of S, 0.070-0.075% of V, 0.030-0.040% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities. The production method of the steel plate of the invention comprises the steps of electric furnace smelting, LF furnace refining, VD vacuum treatment, continuous casting (or die casting), heating, control rolling, cooling, stacking, and normalizing to prepare the steel plate. Through a reasonable component design and process optimization, the steel plate of the invention has excellent mechanical performances, welding performances and processing performances, and has strong market competitiveness.

The invention relates to a preparation method of a lithium ion battery positive electrode material precursor, in particular to a preparation method of small-particle-size uniform-aluminum-doped spherical tricobalt tetraoxide. The preparation method includes following steps: 1, adding soluble aluminum salt and EDTA disodium into a cobalt salt solution to prepare a cobalt-aluminum mixed salt complexsolution; 2, injecting pure water into a reaction kettle to serve as base liquid, blowing in air, adding a small amount of sodium hydroxide solution to adjust pH, and rising temperature; 3, adding the cobalt-aluminum mixed salt complex solution and the sodium hydroxide solution into the reaction kettle for settling reaction while stirring; 4, sampling every 2h to measure granularity till reaching2-5um after more than 40h of reaction, and filtering and washing a material after the granularity reaches a target value; 5, thermally decomposing aluminum-doped hydroxyl cobalt after being washed sectionally to finally obtain small-particle-size uniform-aluminum-doped spherical tricobalt tetraoxide with uniform distribution of aluminum from inside to outside, tricobalt tetraoxide is compact andadhesion-free spherical particles in morphology, tap density is 2.0-2.7g/cm3, and laser granularity distribution is narrow.

The invention provides a nickel base superalloy casting ingot homogenization treatment method, and relates to a GH4738 superalloy casting ingot homogenization treatment process. In the existing GH4738 casting ingot, a large amount of casting state dendrite structures exist, homogenization can cause a large size of the grain, and other problems exist, such that the subsequent cogging forging forming is not easily achieved. A purpose of the present invention is to solve the problems in the prior art. The homogenization treatment method is carrying out an annealing treatment in an annealing furnace, wherein an annealing treatment temperature is 1160-1200 DEG C, and an annealing time is 20-50 h. With the technical scheme of the present invention, problems of element segregation, existing of a large amount of dendrites, large grain and the like can be effectively solved, and an alloy segregation degree can be improved at a maximum so as to establish a foundation for the subsequent cogging forging forming. The nickel base superalloy casting ingot homogenization treatment method can be used for homogenization treatments of GH4738 nickel base superalloys with different casting ingot sizes.

The invention relates to a preparation method of a high-elasticity corrosion-resistant and wear-resistant Cu-Ni-Sn alloy. The preparation method comprises the following steps: vacuum induction melting or covering protection type non vacuum melting of a Cu-Ni-Sn ternary alloy, application of electromagnetic stirring until alloy melt is solidified completely in the subsequent solidification process, and homogenization annealing-water cooling-solid solution-cold deformation-aging treatment of as-cast alloy. Through use of the preparation method of a high-elasticity corrosion-resistant and wear-resistant Cu-Ni-Sn alloy, crystal grains can be refined, dendrite spacing can be reduced, macrosegregation and microsegregation of the series of alloy can be eliminated, aging strengthening effect is excellent, plastic processing property of the series of alloy can be improved, the service life of the alloy can be improved, by the application of electromagnetic stirring in the solidification process, the segregation degree of the obtained as-cast structure is small, the segregation is easy to remove, and the method has the advantages of saving energy, improving production efficiency and reducing production cost.

The formula of a neodymium, praseodymium, dysprosium and yttrium multi-element rare earth alloy permanent magnet material is Re alpha Re' beta Re'' eta B delta Cu zeta Al epsilon Fe gamma. The neodymium, praseodymium, dysprosium and yttrium multi-element rare earth alloy permanent magnet material is characterized in that Re represents Nd and Pr, Re' represents Dy, Re'' represents Y, Fe represents Fe and inevitable impurities, alpha, beta, eta, delta, zeta, epsilon and gamma represent mass percent contents of the elements respectively, the sum of alpha, beta and eta is larger than or equal to 30 and smaller than or equal to 32, the sum of beta and eta is larger than or equal to 5 and smaller than or equal to 12, eta is larger than or equal to 3 and smaller than or equal to 7, delta is larger than or equal to 1.02 and smaller than or equal to 1.09, zeta is larger than or equal to 0 and smaller than or equal to 0.24, epsilon is larger than or equal to 0.33 and smaller than or equal to 0.67, and 100 minus alpha, beta, delta, zeta and epsilon equals to gamma. According to the neodymium, praseodymium, dysprosium and yttrium multi-element rare earth alloy permanent magnet material, the problem that segregation happens to alloy ingots obtained through melting due to element melting point difference and manual operation factors in the traditional melting process is effectively solved, actual coercive force of the alloy ingots is easily improved due to addition of Dy, Y can partly replace Nd and Pr, and production cost is reduced for enterprises; in addition, alpha-Fe influencing performance of the permanent magnetic material can be effectively avoided, and performance of the alloy ingot material is improved.

This invention relates to a fabricating method for anisotropically bonded magnet including: step S1 for adjusting the first mixture and the second mixture, where: the first mixture comprises the first magnetic powder, of which the grain size is in the range of 20-150mum, thermosetting resin of 2.0 wt%being added into the anisotropically bonded magnet, the first additive; the second mixture comprises the second magnetic powder, of which the grain size is in the range of 1-20mum, the second additive; step S2 for adjusting the first mixture and the second mixture; step S3 for making the magnetic intensity of the end part of the shaping metal die be under the 0.8T, the magnetic intensity of the central part of the shaping metal die is 5% higher than that of the said end part of the shaping metal die after said mixed compounds being filled into the metal die; step S4 for heating said mixed compounds at the atmosphere of inert gases or nitrogen gases so as to harden compounds.

The invention relates to a technique method used for raising the density of a steel-column shaped sediment blank of a spray-forming high-speed tool and belongs to the technical field of material processing. The invention thoroughly combines the theory idea and the technical advantage of spray-forming and heat-control concretion. In an early phase of the spray sediment process, the advantages of the spray-forming that an equiaxed grain (less than 20Mum) having no segregation but a uniform and thin structure can be manufactured in a short process can be performed, and then the manufactured high-speed steel sediment blank has high strength, better plasticity and easy-forging capability. In a later phase of the sediment process, i.e. after the spray-forming is finished, the structure of a main body of equipment (such as a tundish and an atomizing sprayer, etc.) is adopted to control output and radiation of the heat. The invention enhances solidification of easy-loosening part of the high-speed steel sediment blank, so as to manufacture high quality and high density sediment blank. The technique not only can solve the segregation of the high-speed steel but also further enhance the density of the sediment blank to guarantee a following smooth process of fine-forging, etc.

The invention relates to a preparation method for a power NCM523 material capable of improving high-and-low-temperature performance, and belongs to the technical field of a positive electrode material of a lithium ion battery. The preparation method comprises the following steps of 1, preparation of an NCM523 precursor, including the sub steps of 1) solution preparation: preparing a mixed solution of Ni, Co, Mn and Y salt; preparing an NaOH alkali solution, adding Al(NO<3>)<3>.9H<2>O, and adding ammonium hydroxide to form an aluminum-containing ammonia alkali solution; 2) parallel flow reaction: performing a parallel flow reaction on the Ni, Co, Mn and Y salt solution and the aluminum-containing ammonia alkali solution in a reaction kettle to form a sky blue turbid liquid; 3) aging: regulating the ph value of the solution to perform aging and crystal type transformation; 4) performing pressing and filtering, washing and drying; and 5) performing demagnetizing; 2, lithium preparing and sintering: enabling a lithium salt to be mixed with a precursor material, and performing sintering and smashing on the mixture to obtain the positive electrode material; and 3, performing liquid phase coating of a lithium rapid ion conductor: enabling Li<3>PO<4>-Al(OH)<3> to be mixed with the positive electrode material, and performing spraying and drying, and sintering. The preparation method has the advantages of simple process, convenient operation, and capability of remarkably improving the high-and-low-temperature performance, and the like.

The invention discloses steel with high low temperature fracture toughness and used for ocean engineering and a manufacturing method thereof. The steel comprises the following components: 0.05%-0.10%of C, 0.2%-0.5% of Si, 1.0%-1.5% of Mn, 0.20%-0.50% of Cu, 1.00%-1.50% of Cr, 1.6%-1.8% of Ni, equal to or less than 0.01% of P, equal to or less than 0.01% of S, 0.01%-0.05% of Als, 0.02%-0.04% of Nb, 0.01%-0.02% of Ti, 0.05%-0.07% of V and the balance of Fe and unavoidable impurities. Rolling is controlled by adopting two phases, at the first phase, the rolling temperature is 950-1050 DEG C, andthe single-pass reduction rate is equal to or greater than 15%; at the second phase, the rolling temperature is 840-880 DEG C, and the single-pass reduction rate is greater than 10%; the average cooling rate is greater than 3 DEG C/s, and the self-tempering temperature is 500-600 DEG C; thermal treatment adopts twice quenching and tempering; the yield strength of a steel plate is equal to or greater than 620 MPa, the thickness of the steel plate is 60-100 mm, and the low temperature fracture toughness is high.

The invention discloses a valve retainer, which is made of a powdered metal material that comprises the following components in percentage by weight: 0.8 to 1.3 percent of C, 2.0 to 4.0 percent of Cr, 1.0 to 3.0 percent of Mo, 3.0 to 6.5 percent of Co, 0.5 to 2.0 percent of Ni, 0.8 to 1.5 percent of Mns, 0.05 to 0.1 percent of P, 0.2 to 0.5 percent of V, less than or equal to 3 percent of other elements and the balance of Fe. A prevention segregation agent is added into the powdered metal material which can make valve retainer. The valve retainer disclosed by the invention can resist high temperature and wear, and resist the high temperature of over 800 DEG C. In a bench test of more than 300 hours, the valve retainer does not generate segregation, which is favorable for cutting and ensuring the size precision and surface roughness of a cut face.

The invention discloses a laser selective melting forming method of a copper-chromium alloy part. The laser selective melting forming method specifically comprises the following steps of preprocessingCu-Cr alloy powder, preparing a program file and a SLM device, finally melting the selective laser to form a copper-chromium alloy part. The laser selective melting technology can directly form complex parts, shorten the production period and improve the forming efficiency, and the method has a great production application value; in addition, the cooling rate can reach 106 orders of magnitude, asmaller molten pool range and a molten pool can be rapidly cooled, and the liquid phase layering phenomenon in the traditional process is overcome.

The invention relates to a preparation method of high-elasticity, corrosion-resistant and wear-resistant Cu-Ni-Sn alloy. The Cu-Ni-Sn multi-element alloy is obtained through vacuum induction melting or covering protection type non-vacuum smelting. In the casting forming process, electromagnetic stirring is applied until alloy liquid is complete solidified, and then the as-cast alloy is subjected to homogenization annealing, hot rolling and cogging, solid solution treatment, cold deformation, spinodal decomposition and other processes. The preparation method of the Cu-Ni-Sn alloy is capable ofrefining crystalline grains, reducing dendritic spacing and eliminating alloy microscopic and macroscopic structure and component segregation, provides implementation conditions for follow-up alloy plastic processing, spinodal decomposition and other processes, and has the beneficial effects that energy is saved, the production efficiency is improved, the service life of the alloy is prolonged, and the production cost is reduced.

The invention relates to a plastic processing method for powder metallurgy high-speed steel. The plastic processing method comprises the following steps of: firstly compression-molding water-atomized high-speed steel powder by adopting a pressure of 800-1000MPa; putting a cold-pressed blank in a vacuum sintering furnace, and sintering the cold-pressed blank in vacuum, wherein the vacuum degree is10<-3> Pa, and the sintering temperature is 1100 DEG C to 1300 DEG C; insulating the heat for 2 hours; cooling the cold-pressed blank to room temperature together with the furnace; heating the sintered blank to 900-1100 DEG C; insulating the heat for 30 minutes; preheating an extruding die to 400 DEG C; putting the blank into the extruding die; and extruding the blank under the conditions that the extruding ratio is 8-27 and the speed of a punch of the extruding die is 20-30 mm.S<-1>. Products produced in the invention can obtain tiny and uniform microscopic structures, and carbide and nonmetallic impurities are distributed in a dispersive manner in the sintering process. Extruded materials have higher hardness and bending resistance, and the hardness of the extruded materials can reach more than 66.8HRC without any heat treatment.

The invention relates to the field of preparation of alloy materials, in particular to a preparation method for a TiAl-Ni alloy plate with high strength and toughness and high stability. The preparation method aims to solve the problems of uneven structure and poor mechanical properties caused by excessive grain growth and process heredity of a TiAl alloy plate material prepared through existing ingot metallurgy and powder metallurgy methods, especially the problems of low strength and plasticity. The preparation method comprises the following steps of 1, weighing raw materials; 2, smelting acast ingot; 3, carrying out primary pretreatment on a blank; 4, carrying out secondary pretreatment on the blank; 5, carrying out jacketing and hot rolling; 6, carrying out stabilizing treatment; and7, removing a jacket so as to obtain the TiAl alloy plate. The plate obtained through the preparation method has the advantages of being good in surface quality, fine and uniform in structure, good inmechanical property and high in repeatability.

A rare-earth alloy permanent magnet material preparation device comprises a raw material treatment portion, a precipitation tank, an electrolytic furnace, a grinding mechanism, a stamping mechanism and a vacuum sintering furnace. The raw material treatment portion comprises a rare-earth metal treatment tank and a blending tank, a delivery pipe connected with the blending tank is arranged on the rear-earth metal treatment tank, the blending tank is connected with the precipitation tank through a complexing solution delivery pipe, the precipitation tank is connected with the electrolytic furnace, a feed inlet is arranged on one side of the electrolytic furnace, a casting chamber is arranged at the tail end of the electrolytic furnace and connected with a cooling chamber, the cooling chamber is connected with the grinding mechanism through a discharge pipe, and the grinding mechanism is connected with the stamping mechanism which is connected with the vacuum sintering furnace. The problem of segregation of alloy ingots is solved effectively, high temperature strength, structural stability, welding performance and corrosion resistance of the alloy ingots are improved beneficially due to addition of Sc, and the common electrolytic furnace can be used for smelting the alloy ingots by adopting mixture after Nd, Pr, Dy and Sc complexing.