21results about How to "Uniform grain" patented technology

This invention discloses a method for preparing high-elongation bars for cold forging, belonging to the field of aluminum alloy preparation technology. Through optimization of composition and process, the prepared bars possess high purity, uniform and fine equiaxed grain structure, and excellent plasticity, with significantly improved elongation. This meets the stringent requirements of cold forging for high material plasticity, resulting in a bright, crack-free surface and uniform grains after cold forging, overcoming problems such as oxide scale, coarse grains, and poor dimensional accuracy caused by hot forging. Furthermore, the introduction of modified talc and sodium nitrate as refining agents further promotes uniform microstructure, achieving high elongation and excellent cold forging performance.

The invention discloses a wheel forging and rolling composite forming process based on deformation distribution and a structure regulation and control method, and belongs to the technical field of wheel manufacturing. The method comprises the steps that a composite forming path of pre-forging, finish forging and finish rolling is adopted, the deformation amount of each procedure is scientifically distributed, pre-forging accounts for 70%-80%, finish forging accounts for 15%-20%, and finish rolling accounts for 5%-10%, so that forming precision and microstructure control is achieved. Meanwhile, quantitative prediction is carried out on microstructure evolution in the whole forming process by constructing a multi-scale digital simulation platform integrating a material constitutive model, a microstructure evolution model and a cellular automaton. And based on a prediction result, active and accurate regulation and control of microstructures of different parts of the wheel are realized through virtual iteration optimization of key process parameters such as temperature, deformation and strain rate, and finally, the complex-structure wheel with high dimensional precision, uniform and fine structure and excellent comprehensive performance is obtained. According to the wheel shape-character collaborative manufacturing method, shape-character collaborative manufacturing of the wheel is achieved, and the scientificity and efficiency of process design are improved.

The invention discloses a grain size control method of a reclaimed material hard alloy, which comprises the following steps: S1, component analysis of the reclaimed material: the proportion of oversize products is 0-8% when the reclaimed material passes through a 110-120-mesh sieve; s2, burdening according to the use ratio of the reclaimed material being 50%-99% and the ball-to-material ratio being (2-5): 1, carrying out a ball milling test, preparing a sample, and detecting the coercive force; s3, the raw material ratio and the ball-to-material ratio are equal to those in the step S2, and a mixture is obtained through batching and ball milling; s4, the mixture is subjected to compression molding, and a pressed blank is obtained; and S5, the pressed blank is subjected to pressure sintering, and the reworked material hard alloy with the grain size being 2.0-3.0 microns is obtained. The method is simple and easy to implement, the grain size of the regenerated material can be accurately judged, the integrity and uniformity of alloy grains can be ensured, the prepared regenerated hard alloy has good physical performance, the performance very close to that of a raw material alloy can be achieved, and the application field of the regenerated hard alloy is widened.

The invention relates to the technical field of bolt production, and particularly discloses a high-strength bolt machining process and device. Comprising the following steps: S1, material selection: selecting an alloy steel blank containing C, Si, Mn, Cr, Mo, V and the balance of Fe; s2, cold heading forming is conducted, specifically, the alloy steel blank is placed in a multi-station cold heading machine, and a bolt blank is formed through continuous cold heading and forging; s3, heat treatment is conducted, specifically, the bolt blank is subjected to quenching treatment and then subjected to tempering treatment, and a bolt base body is obtained; and S4, surface treatment is conducted, specifically, phosphating treatment is conducted on the surface of the bolt base body in sequence to form a phosphating layer, the composite coating is coated, and the high-strength bolt is obtained. The high-strength bolt machining process can be used for manufacturing connecting components requiring high reliability under complex working conditions such as heavy load, vibration and impact, and the high-strength bolt machining process has the advantages that the toughness, fatigue resistance and delayed fracture resistance are improved while high strength is kept.

This invention discloses a high-performance corrosion-resistant non-magnetic stainless steel and its preparation method, belonging to the technical field of stainless steel materials. It solves the problems of existing non-magnetic stainless steels where the mechanical properties and corrosion resistance cannot be simultaneously and effectively improved, and the microstructure uniformity is poor. The high-performance corrosion-resistant non-magnetic stainless steel comprises, by mass percentage: 18.30% ≤ Cr < 21.00%, 2.60% ≤ Mo ≤ 3.00%, 4.10% ≤ Ni ≤ 4.50%, 20.50% < Mn ≤ 22.00%, Si ≤ 0.4%, 0.015% < Nb ≤ 0.03%, P ≤ 0.025%, S ≤ 0.01%, C ≤ 0.02%, 0.80% < N ≤ 0.85%, with the balance being Fe and other unavoidable impurities. The high-performance corrosion-resistant non-magnetic stainless steel of this invention has fine and uniform grains, and excellent mechanical properties and stress corrosion resistance.

The utility model provides a kind of biological bait granulator for crab seed culture, including first "U" type support, second "U" type support, granulating barrel and storage barrel, first "U" type support top middle is equipped with granulating barrel, second "U" type support is located the top of granulating barrel, first electric telescopic link is connected with pressure disc and is equipped in second "U" type support top, extrusion hole plate is equipped in granulating barrel bottom outlet, as dry one outlet hole is equipped on extrusion hole plate, arc cutting knife is equipped in granulating barrel side, arc cutting knife is driven by electric telescopic link, storage barrel is set in the below of granulating barrel.The utility model is by setting arc cutting knife in the bottom of granulating barrel, utilize the reciprocating motion of electric telescopic link to drive arc cutting knife reciprocating cutting bait to form uniform small section, to realize uniform granulation.Adopt the mode of electric telescopic link to realize that bait is automatically and quickly and uniformly cut off, improve the efficiency of granulation.

The invention discloses a low-temperature oxidation in-situ constructed cuprous oxide / copper oxide heterojunction photoelectric cathode and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing ammonium persulfate and sodium hydroxide into an aqueous solution with a specific concentration, then immersing foamy copper into the aqueous solution to react, then putting the foamy copper after reacting for a period of time into a tubular furnace, and annealing for a certain time in an argon atmosphere to prepare the cuprous oxide photoelectric cathode. And placing the prepared cuprous oxide photoelectric cathode in a drying box for low-temperature oxidation reaction for a certain time to finally prepare the cuprous oxide / copper oxide heterojunction photoelectric cathode, namely Cu2O / CuO. The prepared Cu2O / CuO heterojunction photoelectric cathode shows excellent photoelectrochemical performance, and can be used in the fields of photoelectrochemical water decomposition, solar cells, carbon dioxide reduction and the like.

This invention discloses a stress corrosion resistant non-magnetic stainless steel and its preparation method, belonging to the technical field of stainless steel materials. It solves one of the problems in existing technologies: the microstructure uniformity of non-magnetic stainless steel is difficult to control, and the mechanical properties and stress corrosion resistance of existing non-magnetic stainless steel cannot be simultaneously and effectively improved. The composition of the stress corrosion resistant non-magnetic stainless steel, by mass percentage, includes: 18.30% ≤ Cr < 21.00%, 1.10% ≤ Mo ≤ 1.40%, 2.60% ≤ Ni ≤ 3.0%, 20.50% < Mn ≤ 22.00%, Si ≤ 0.4%, 0.01% ≤ Nb ≤ 0.015%, P ≤ 0.025%, S ≤ 0.01%, C ≤ 0.02%, 0.76% ≤ N ≤ 0.80%, with the balance being Fe and other unavoidable impurities. The stress corrosion resistant non-magnetic stainless steel of this invention has fine and uniform grains, and excellent mechanical properties and stress corrosion resistance.

This invention discloses a method for hydrolyzing high-F-value titanium liquid, as well as the hydrolyzed material and titanium dioxide, comprising the following steps: S1. Preparing the hydrolyzed titanium liquid and heating it; preparing seed crystal preparation titanium liquid and alkaline solution; S2. When the hydrolyzed titanium liquid reaches 80-85℃, heating the seed crystal preparation titanium liquid and the alkaline solution to 50-60℃ respectively; S3. Adding the seed crystal preparation titanium liquid to the alkaline solution, heating to 92-95℃, and maintaining the temperature until the final stability of the hydrolyzed seed crystals is 90-100ml, at which point the preparation of the hydrolyzed seed crystals is complete; S4. Stopping the heating when the temperature of the hydrolyzed titanium liquid reaches 92-95℃, adding the prepared hydrolyzed seed crystals, and stirring; S5. Heating the hydrolyzed titanium liquid to boiling, maintaining a gentle boil, and when the hydrolyzed titanium liquid turns white, adding dilution water until the hydrolysis is complete. The prepared hydrolyzed seed crystals have uniform grain size, the hydrolyzed material has uniform particle size, the hydrolysis quality of the high-F-value hydrolyzed titanium liquid is high, and the water washing time is short.

The invention relates to the technical field of carrier preparation, and discloses a preparation method of an alumina carrier and the alumina carrier prepared by the preparation method. The method comprises the following steps: mixing pseudo-boehmite with water, an extrusion aid and a peptizing agent, molding, and then carrying out first drying and roasting; the mass ratio of H to A is 0.5-1, and the mass ratio of H to A is equal to (the mass of water + the mass of pseudo-boehmite * (1-the dry basis coefficient of pseudo-boehmite)-the mass of pseudo-boehmite * the dry basis coefficient of pseudo-boehmite * the pore volume of pseudo-boehmite) / (the mass of pseudo-boehmite * the dry basis coefficient of pseudo-boehmite * the pore volume of pseudo-boehmite); the M / N mass ratio is 1.5-6%, and the M / N mass ratio is equal to (the mass of the peptizing agent * the concentration) / (the mass of the pseudo-boehmite * the dry basis coefficient of the pseudo-boehmite) * 100%. The method has the advantages of simple process, easy control of operation conditions, easy industrial implementation and low cost, and can be used for preparing the alumina carrier with high pore distribution concentration ratio.

The application discloses a semi-solid thixotropic die casting forming method of a narrow solid-liquid two-phase zone alloy, and comprises the following steps: step one: the narrow solid-liquid two-phase zone alloy is added into a heating device and heated to a superheating temperature, and after complete melting, the alloy is cooled for a certain time to obtain an alloy blank with a cast structure; step two: the alloy blank is added into an extrusion device to complete cold extrusion, and an alloy blank containing high-density dislocations and lattice distortion structures is obtained; step three: the alloy blank is heated for the first time, the heating temperature is set between a recrystallization temperature and a solidus temperature of the alloy, and isothermal heat treatment is carried out to obtain fine and uniform recrystallized grains; step four: the alloy blank is heated for the second time, the temperature is set above the solidus temperature of the narrow solid-liquid two-phase zone alloy, and isothermal heat treatment is carried out to obtain a semi-solid blank; and step five: the semi-solid blank is subjected to die casting forming. The application has the advantages that excellent castings with physical properties are formed.

The application discloses a barium titanate-based dielectric energy storage ceramic material with low loss and high energy storage efficiency and a preparation method thereof. The barium titanate-based dielectric energy storage ceramic material belongs to the field of dielectric functional ceramics and has a chemical composition of 0.85[0.88BaTiO3-0.12Bi 2 / 3 Mg 1 / 3 Ta 2 / 3 O3]‑0.15CaZrO3+xwt.%MnO2: wherein 0.5≤x≤2, x is a molar percentage, and the barium titanate-based energy storage ceramic doped with multi-ions Bi 3+ , Mg 2+ , Ta 5+ , Ca 2+ , Zr 4+ and MnO2 with different mass percentages has excellent energy storage efficiency and density, low loss, and is used for dielectric capacitors, and thus can be used in the fields of electronic power, military industry and high-energy pulse power technology.

The application discloses a preparation process of a lead zirconate titanate (PZT) film layer, a film layer structure and application thereof, and relates to the technical field of piezoelectric material film layer preparation. The preparation process comprises the following steps: S1, forming a low tensile stress silicon nitride layer on the surface of a substrate, which is used for homogenizing the in-plane stress gradient of a wafer; and S2, forming a piezoelectric functional layer on the surface of the silicon nitride layer in a sputtering mode, wherein the piezoelectric thin film material of the piezoelectric functional layer is lead zirconate titanate (PZT). The film layer structure and the preparation process thereof adopt the silicon nitride layer to relieve the thermal mismatch stress of the piezoelectric functional layer system, can improve the piezoelectric constant e31 of the central region of the wafer, and improve the uniformity of the whole wafer.

The invention relates to the technical field of martensitic steel, in particular to a 04Cr16Ni5Mo stainless steel plate rolling and temperature control technology, in the technology, a three-section heating mode (the preheating rate is smaller than or equal to 4 DEG C / min, and the soaking time is larger than or equal to 2.5 h) is adopted in a heating method, inert gas is introduced, the low heat conduction characteristic of 04Cr16Ni5Mo is adapted, the temperature difference between the surface layer and the center is reduced, thermal stress cracks are avoided, and the temperature control performance of the 04Cr16Ni5Mo stainless steel plate is improved. The problem of insufficient physical performance adaptation is solved; differential temperature and heat preservation time are set for heat treatment, various heat treatment requirements of the steel type are accurately matched, and the problem that heat treatment processes are not matched is solved; the whole process cooperates with blank pretreatment to remove defects, straighten to control flatness and slow cooling to control structures, the quality of finished products is further guaranteed, generation of a corrosion source after rolling and deformation after heat treatment are avoided, and the corrosion resistance and structural stability of steel are improved.

The invention belongs to the technical field of high-temperature alloy heat treatment, and particularly relates to a bar preparation method for reducing the precipitated phase content and notch sensitivity of a low-expansion high-temperature alloy. A low-expansion high-temperature alloy cast ingot with the Si element content being 0.25%-0.50% is selected to be forged, then hot materials are returned to a furnace to be subjected to short-time heat treatment, and finally the needed bar is obtained through cooling. According to the preparation method, precipitated phases are redissolved through high-temperature short-time heat treatment, under the proper heat treatment temperature and time, the number of the precipitated phases can be effectively reduced, inheritance of the precipitated phases in subsequent forging machining is avoided, and the forging performance basis is guaranteed; and further, static recrystallization of edge grains can be promoted to promote uniformity of bar grains, the problem that precipitated phases of the core and the edges are not uniform is solved, the lasting notch sensitivity of the bar is effectively reduced, the strength stability of the alloy is improved, and it is ensured that the low-expansion high-temperature alloy bar meets the application requirements of aerospace and other high-end equipment in the extreme environment.

The application discloses a kind of core-shell structure fast charging long cycle artificial graphite, its preparation method, negative electrode material and purposes, including, petroleum coke or acicular coke aggregate D50 8~20 μm, non-biomass hard carbon raw material powder D50 1~10 μm and pitch are mixed according to the mass ratio hard carbon: pitch = 1:9~5:5, aggregate: composite coating agent = 95:5~85:15, pre-mixing S1 is carried out at 100~200 DEG C, 160~220 DEG C melt kneading granulation S2, carbonization S3 is carried out at 600~1000 DEG C, and graphitization S4 is carried out at 2800~3200 DEG C, and core-shell structure artificial graphite is prepared by one-step method.The shell layer is composed of uniformly dispersed graphitized hard carbon and soft carbon, and is densely coated outside the artificial graphite core.The first reversible specific capacity of the product is greater than or equal to 350 mAh / g, the first coulombic efficiency is greater than or equal to 93%, and the capacity retention rate at 5.0C / 0.2C is greater than or equal to 84%, with excellent fast charging performance and cycle stability, simple process and low cost.

This invention discloses a high-performance corrosion-resistant non-magnetic drill collar and its manufacturing method, belonging to the field of stainless steel material technology. It solves the problems of poor microstructure uniformity and the inability to simultaneously and effectively improve mechanical properties and stress corrosion resistance in existing non-magnetic drill collars. The manufacturing method includes: melting steel; preparing ingots; forging the ingots into steel billets using a high-speed forging mill after they are removed from the furnace; heating and holding the steel billets; forging the steel billets into intermediate billets using a radial forging mill; water-cooling the intermediate billets; performing secondary forging of the water-cooled intermediate billets using a radial forging mill, followed by air cooling to obtain finished steel billets; straightening, drilling, reaming, boring, internal controlled rolling, and shot peening of the finished steel billets to obtain the high-performance corrosion-resistant non-magnetic drill collar. The high-performance corrosion-resistant non-magnetic drill collar of this invention has fine and uniform grains and excellent mechanical and corrosion resistance.

The application provides a micro-nano ceramic particle reinforced die steel with high impact performance and a preparation method. The preparation method comprises the following steps: putting TiAl alloy powder, BN powder and C powder into a mixing machine to obtain a mixture 1, and using pure aluminum strip to coat the mixture 1 to obtain a wire A; the wire A is subjected to buffer segmented electric explosion 1 to obtain a mixture 2; putting NbAl alloy powder and B4C powder into a mixing machine to obtain a mixture 3, and using pure aluminum strip to coat the mixture 1 to obtain a wire B through coating forming 2; the wire B is subjected to buffer segmented electric explosion 2 to obtain a mixture 4; the mixture 2 and the mixture 4 are coated by using stainless steel strip through coating forming 3 to obtain a wire C; the die steel is melted into a molten steel, the wire C is added into the molten steel, and then vacuum degassing, electroslag remelting, high-temperature diffusion, multi-directional forging and heat treatment are carried out to obtain the micro-nano ceramic particle reinforced die steel with high impact toughness. The longitudinal unnotched impact energy of the die steel is 578.9-601.6 J, the transverse unnotched impact energy is 576.7-590.9 J, and the isotropy is 0.96-0.99.

This invention relates to an explosive granulation device, comprising a reciprocating arm (1), a screen (2), a grinding wheel (3), and an adjusting component (4); the reciprocating arm (1) comprises a symmetrically arranged left arm and a right arm, which reciprocate up and down in opposite directions around the center point where they connect; the two ends of the strip screen (2) are respectively fixed on the left and right arms of the reciprocating arm (1), forming a V-shaped structure; the grinding wheel (3) is disposed on the inner surface of the V-shape of the strip screen (2), and a spindle (7) is disposed on the axis of the grinding wheel (3); the adjusting component (4) is connected to both ends of the spindle (7) of the grinding wheel (3) and is used to adjust the contact pressure between the grinding wheel (3) and the surface of the strip screen (2). This invention has a simple structure, is easy to form a continuous production line with upstream and downstream equipment, is easy to control, and has high reliability; it occupies little space, has a wider range of product size applicability, good safety, and is convenient to maintain.

This invention relates to an antioxidant solder material and a welding process for surface-mount LEDs, belonging to the field of LED welding technology. It achieves homogenization of composition through a combination of step-by-step melting and microstructure control. First, a tin-copper-bismuth master alloy is prepared by pre-melting in a pit furnace, pre-dispersing the bismuth element. Then, vacuum induction melting combined with electromagnetic stirring, along with an intermediate alloy feeding method, promotes the uniform dispersion of high-melting-point / active elements such as nickel and rare earth elements. Ni and rare earth elements can play a role in grain refinement and grain boundary purification, effectively suppressing the gravitational segregation and coarsening of the bismuth phase, avoiding the formation of brittle enrichment zones in the solder joints. The resulting solder joints have uniform grains, a moderate thickness of the intermetallic compound layer, and a smooth morphology, significantly improving the shear strength and thermal fatigue resistance of the solder joints and reducing the risk of brittle fracture failure of micro-solder joints.

The application discloses a rolling method of a large-size TA15 titanium alloy super-thick plate, and the method comprises the following steps: firstly, sequentially performing twice beta single-phase zone forging, twice alpha+beta two-phase zone forging and forming forging on a TA15 titanium alloy ingot to obtain a TA15 titanium alloy slab; secondly, performing ladder heating on the TA15 titanium alloy slab; thirdly, obtaining a TA15 titanium alloy rolling slab through one-time rolling; fourthly, performing finish heat treatment after turning over, and air cooling after reciprocating straightening; and fifthly, performing shape correction treatment to obtain a finished TA15 titanium alloy super-thick plate. The original beta grains are fully broken through the five-time forging, ladder heating and one-time rolling in sequence, the rolling slab with consistent structure and performance is obtained, the grain growth is inhibited, the strengthening phase is precipitated through the rapid water cooling treatment, the heat treatment and the shape correction treatment, the TA15 titanium alloy super-thick plate with small grain size, small anisotropy and excellent performance is obtained, and the TA15 titanium alloy super-thick plate is suitable for large structural parts in the fields of aviation and spaceflight.