19results about How to "Avoid growing up" patented technology

The invention discloses low-cost normalized Q355NE low-alloy structural steel, which relates to the technical field of steel production and comprises the following chemical components in percentage by mass: 0.11 to 0.14 percent of C, 1.30 to 1.55 percent of Mn, 0.35 to 0.45 percent of Si, 0.015 to 0.035 percent of Nb, 0.020 to 0.035 percent of Ti, 0.020 to 0.050 percent of Alt, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S and the balance of iron and inevitable impurities. According to the invention, the component design with medium and low C content is adopted, only by adding Nb and Ti for compounding, a fine and uniform structure is obtained in a special rolling mode in the rolling stage, and a special heating system is adopted in the heat treatment normalizing stage, so that the rolled fine structure meets the requirements of inheritance, strength guarantee and-40 DEG C low-temperature impact; and the low-temperature impact toughness at-40 DEG C is 150 J or above, and the ductility is 27% or above.

The present application relates to a short process forging method of Ti1100 alloy bar, which is used to solve at least one of the problems of long time, low production efficiency, poor mechanical properties, poor process stability, poor consistency of different batches, high cost and the like in the prior art forging method. The forging method controls the heating times of blooming forging and trans-phase zone forging, and cooperates with gradient air cooling treatment. Specifically, in the organization control, the conventional multi-heating-time beta phase zone upsetting and drawing forging is abandoned, the single-heating-time beta phase zone precise temperature control and dynamic deformation regulation are adopted, the excessive growth of beta grains is avoided, and the needle-like alpha phase lamellar aggregation or equiaxed alpha phase abnormal precipitation is prevented by combining with gradient air cooling, so as to ensure the uniformity of the organization, solve the problems of mechanical property fluctuation exceeding the index and low service reliability.

The invention discloses a heat treatment method of a low alloy-stainless steel composite plate. The heat treatment method comprises the steps of quenching, tempering and stress relief treatment. In the quenching step, the composite plate is placed in a roller hearth type heating furnace to be heated, an upper layer radiation heating pipe and a lower layer radiation heating pipe are distributed on the roller hearth type heating furnace, a stainless steel coating of the composite plate is placed upwards, and a low-alloy base layer is placed downwards to be in contact with a heating furnace roller way; the initial temperature of the upper-layer radiation heating pipe and the lower-layer radiation heating pipe is set to be 880-890 DEG C, after heat preservation is carried out for 1.2-1.5 min / mm according to the total thickness, the temperature of the upper-layer radiation heating pipe is rapidly increased to 1000-1050 DEG C, the temperature of the lower-layer radiation heating pipe is kept unchanged, heat preservation is carried out for 1.0-2.0 min / mm according to the thickness of a stainless steel coating, and then the steel plate is discharged out of the furnace and enters a roller hearth type quenching machine to be cooled. The stainless steel layer obtained through the method is good in corrosion resistance and free of cracks after being bent through intergranular corrosion, the tensile strength of the steel plate is larger than or equal to 630 MPa, and the impact energy at the temperature of-40 DEG C is 200 J or above.

The invention provides a shell ring forge piece with high impact toughness and a preparation method thereof, and relates to the technical field of forging. By improving the forging ratio of first fire forging, internal gaps of the forge piece can be better pressed in the upsetting process, internal grain structures of the forge piece are crushed to be finer, and the yield of the forge piece is improved. Therefore, the internal structure of the forge piece is improved, the structure defect is eliminated, and the strength and impact toughness of the forge piece are improved. In addition, the heating temperature is properly reduced in the last fire forging process, grains in the forge piece can be effectively prevented from excessively growing, and the impact toughness of the forge piece can be further improved. And finally, the quenching temperature is controlled to be 950-970 DEG C, so that the high strength and the high impact toughness of the shell ring forge piece can be further ensured. In conclusion, the 12Cr2Mo1V shell ring forged piece manufactured through the method has the high strength and the high impact toughness.

The invention provides magnetic nanoparticles and a preparation method and application thereof.The chemical formula of the magnetic nanoparticles is Sm alpha Fe gamma TM beta N epsilon, TM comprises titanium, alpha is larger than or equal to 2 and smaller than or equal to 4, gamma is larger than or equal to 16.5 and smaller than or equal to 17.5, beta is larger than or equal to 0.05 and smaller than or equal to 0.5, epsilon is larger than or equal to 3.1 and smaller than or equal to 3.5, and the particle size of the magnetic nanoparticles ranges from 20 nm to 50 nm. And the method is more suitable for miniaturization and light-weight development of magnetic components.

The invention relates to a 700 DEG C high-temperature titanium alloy for medium and short time use and a preparation method thereof, belongs to the technical field of titanium alloy processing, and solves the problem that a medium and short time high-strength titanium alloy resistant to extreme high temperature (700 DEG C) cannot be prepared in the prior art. The 700 DEG C high-temperature titanium alloy for medium and short time use comprises the following components in percentage by weight: 5.5 to 6.5 percent of Al, 3.0 to 5.0 percent of Sn, 5.0 to 8.0 percent of Zr, 0.5 to 1.5 percent of Mo, 0.2 to 1.0 percent of Nb, 0.6 to 0.8 percent of Si, 1.0 to 2.0 percent of W and the balance of Ti. The room-temperature tensile strength Rm is larger than or equal to 1120MPa, the yield strength Rp0.2 is larger than or equal to 1010MPa, the ductility A is larger than or equal to 8%, and the percentage reduction of area Z is larger than or equal to 10%. At 700 DEG C, the tensile strength Rm is larger than or equal to 610 MPa, the yield strength Rp0.2 is larger than or equal to 470 MPa, the ductility A is larger than or equal to 20%, and the percentage reduction of area Z is larger than or equal to 50%. The material can resist the high temperature of 700 DEG C, and has certain medium and short time high temperature durability and fracture toughness. And the requirements of medium and short time limit high-temperature resistance (700 DEG C) high-strength titanium alloy can be met.

The application discloses a method for improving the performance of aluminum-steel composite plates and relates to the technical field of composite plates, and comprises the following steps: S1, pretreating the steel material; S2, coating aluminum material on the surface of the steel plate by using a stir friction deposition additive technology to prepare an aluminum-steel composite plate; S3, rapidly cooling the aluminum-steel composite plate by using an auxiliary medium; and S4, post-heat treating the aluminum-steel composite plate, wherein the overall performance of the aluminum-steel composite plate is improved by annealing the steel base plate and heat treating the subsequent composite plate, and the interfacial shear performance of the aluminum-steel composite plate is improved.

This invention discloses a method for preparing a three-phase composite material of perovskite, carbon, and alloy particles, and its application in water electrolysis. The method allows for the in-situ growth of 10-20 nm alloy particles on the surface of perovskite, and the coating of the perovskite and alloy particles with a carbon-nitrogen shell. The perovskite has a size of 100-200 nm, and the carbon-nitrogen shell has a thickness of approximately 10 nm, which is adjustable. In this invention, perovskite material is distributed in a dopamine salt solution. Under alkaline conditions, the dopamine salt polymerizes on the perovskite surface to form a polydopamine coating. After drying, it is calcined under an inert atmosphere to form a carbon-nitrogen shell structure. The metal sites in the perovskite and the alloy particles act as active sites, catalyzing the oxygen evolution reaction. The sufficiently small size of the surface-deposited alloy particles provides more active sites, promoting improved catalytic activity. The carbon-nitrogen shell increases the conductivity of the material, further enhancing its electrocatalytic activity.

The invention provides an iron oxide powder roasting furnace and a method for producing low-chlorine low-moisture iron oxide powder. The iron oxide powder roasting furnace comprises a furnace body, a first heating assembly and a second heating assembly. A furnace chamber is formed in the furnace body; the first heating assembly supplies heat to the furnace chamber at the first heating position, and the second heating assembly supplies heat to the furnace chamber at the second heating position; the first heating position is located between the top and the middle of the furnace chamber, and the second heating position is located between the middle and the bottom of the furnace chamber; a first reaction area is formed between the first heating position and the top of the furnace chamber; a second reaction zone is formed between the second heating position and the bottom of the furnace chamber, and an intermediate reaction zone is formed between the first reaction zone and the second reaction zone; the first reaction zone has ascending airflow in the roasting process, and the second reaction zone has descending airflow in the roasting process. The low-chlorine low-moisture iron oxide powder can be obtained, the problem that the chlorine content of the iron oxide powder exceeds the standard is solved, the moisture of the iron oxide powder is reduced, and the specific surface area of the iron oxide powder is increased.

The invention relates to a samarium-cobalt magnet and a preparation method thereof. The preparation method of the samarium-cobalt magnet comprises the steps of burdening and smelting, crushing and pulverizing, forming and isostatic pressing, sintering, solid solution and tempering, in the steps of sintering, solid solution and tempering, the sintering temperature T sintering is 1230-2 (WFe * 100) + / -2 DEG C, the solid solution temperature T solid is 1230-4 (WFe * 100) + / -2 DEG C, WFe is the mass fraction of Fe in the samarium-cobalt magnet, WFe is smaller than or equal to 20%, and the balance is Fe. The tempering comprises first-stage tempering and second-stage tempering, the temperature of the first-stage tempering is 830-850 DEG C, the time of the first-stage tempering is 4-8 hours, the temperature of the second-stage tempering is 380-420 DEG C, and the time of the second-stage tempering is 2-4 hours. According to the preparation method of the samarium-cobalt magnet, the mechanical property of the samarium-cobalt magnet can be remarkably improved, and meanwhile operation is easy, energy consumption is low, and cost is low.

The application provides a laser shock peening method based on the coupling of magneto-caloric effect and pre-stress, comprising the following steps: S1: performing magneto-caloric pretreatment on a metal material, wherein the magneto-caloric pretreatment is performed under a temperature condition lower than the recrystallization temperature of the metal material, and an alternating magnetic field with a strength greater than 1T is applied; S2: applying pre-stress to the metal material after the magneto-caloric pretreatment; S3: performing laser shock peening on the metal material while the magneto-caloric field and / or the pre-stress are maintained; and S4: performing heat preservation and gradient cooling treatment on the metal material after laser shock. Through the synergistic effect of the magneto-caloric coupling effect and the pre-stress regulation, the core problem of the difficulty of laser shock peening of hard materials is effectively solved.

The application discloses a strontium ferrite / polyether ether ketone composite magnet and a preparation method and application thereof, and belongs to the technical field of permanent magnet materials.The strontium ferrite / polyether ether ketone composite magnet comprises, in mass fraction, near Curie point magnetic field heat-treated strontium ferrite magnetic powder 84-95 parts, polyether ether ketone 5-15 parts, silane coupling agent 0.5-1.5 parts and lubricant 0.3-0.7 parts.The application adopts the above strontium ferrite / polyether ether ketone composite magnet and the preparation method and application thereof, realizes the synergistic improvement of magnetic performance, mechanical strength and heat resistance through intrinsic magnetic domain structure optimization, interface bonding strengthening and high densification structure design, and can meet the application requirements under the working conditions of high temperature, high reliability and high strength.

This invention relates to a vacancy-controlled manganese selenide-molybdenum selenide-sulfurite heterojunction catalyst, its preparation method, and its applications. The invention first prepares nanoparticle-sized MnSe, then reacts the MnSe with sodium molybdate, Se powder, and other raw materials via a hydrothermal reaction to obtain the manganese selenide-molybdenum selenide-sulfurite heterojunction catalyst. Further, Mn vacancies are introduced according to different performance requirements. Vacancy-introducing agents include ethylenediaminetetraacetic acid, citric acid, iminodiacetic acid, aminotriacetic acid, sodium ethylenediaminetetramethylene phosphate, and hexametaphosphate, ultimately yielding the vacancy-controlled manganese selenide-molybdenum selenide-sulfurite heterojunction catalyst. The vacancy-controlled manganese selenide-molybdenum selenide-sulfurite heterojunction catalyst exhibits significantly enhanced photoelectrochemical and electrocatalytic performance; its photocurrent density is 5.2 times that of single-electrochemical MoSSe, and the electrocatalytic hydrogen evolution overpotential is reduced to 197 mV compared to MoSSe's 476 mV. The method of this invention is simple, easy to control, and has high production efficiency.

This invention discloses a method for preparing Tenmoku glazed ceramic products with hare's fur texture, comprising the following steps: (1) preparing a body and firing it to obtain a body; (2) applying a protective glaze and firing it; (3) applying a main glaze and firing it to obtain the Tenmoku glazed ceramic product with hare's fur texture. This invention, by introducing a protective glaze between the body and the main glaze, optimizes the clay formula and firing process, enabling the control of the direction and speed of iron ion crystallization, thereby allowing α-FeO ​​crystals to grow in a directional manner. This results in a more obvious and uniform deep black, hare's fur-like texture on the finished ceramic, ensuring the quality of the final product.

The application relates to the field of cupronickel materials, and particularly discloses a new type of cupronickel suitable for a MIM process and a forming process thereof. Metal powder raw materials include the following mass percentages: Ni 12-18%, Sn 0.6-1.0%, mixed lanthanum-cerium-praseodymium rare earth 0.6-1.0%, Cu 80.4-86.4%, and the balance of Fe and inevitable impurities. When the material is used as a whole, the oxidation resistance of the new material in a catalytic degreasing process can be significantly improved, and the material loss in a sintering process is also greatly reduced, so that the inherent shortcomings of traditional cupronickel are overcome, and various cupronickel products with complex shapes can be perfectly produced through the MIM technology.

This invention discloses a method for preparing highly spherical zirconia microspheres based on a controllable emulsion template method. Using a water-in-oil emulsion as a template, a composite emulsifier of Span-80 and Tween-80 is employed at a mass ratio of 2:1-4:1, a total concentration of 2-3%, and an oil-to-water volume ratio of 3:1-5:1. Uniform and stable emulsion droplets are formed under a stirring intensity of 800-1500 rpm. The emulsion is then cured at a constant temperature of 50-65℃ for 1-3 hours to allow the gel network to form slowly, preventing microsphere shrinkage and cracking. Finally, a three-stage stepped sintering process is used: increasing the temperature at 1-3℃ / min to 300-400℃ and holding for 1-2 hours; increasing the temperature at 2-5℃ / min to 700-800℃ and holding for 1-2 hours; and increasing the temperature at 3-8℃ / min to 1350-1400℃ and holding for 15-30 minutes to inhibit abnormal grain growth and achieve sufficient densification. Through the coordinated control of emulsification, curing and sintering, the prepared zirconia microspheres have excellent sphericity, particle size uniformity, density and mechanical properties, and the process parameters can be adjusted over a wide range, showing good prospects for industrial application.

The invention belongs to the technical field of heat treatment, and discloses a heat treatment process for improving the superplasticity of duplex stainless steel. The heat treatment process comprises the following steps that a duplex stainless steel plate is heated to 1050-1100 DEG C, and heat preservation is conducted for 40 min; then the temperature is reduced to 500 DEG C or below at the cooling speed of 100-110 DEG C / s, and then the temperature is reduced to 20-30 DEG C at the cooling speed of 5-10 DEG C / s; the cooled duplex stainless steel plate is rolled, and the total rolling reduction rate is 50-80%; and the rolled stainless steel plate is subjected to first heating, then superplastic stretching is conducted, and the heat treatment process is completed. After the duplex stainless steel is treated through the technology, precipitation of harmful phases in traditional duplex stainless steel can be effectively reduced, the two-phase structure of ferrite and austenite is guaranteed, and then the ductility of superplastic deformation of the duplex stainless steel is improved.

The invention relates to the technical field of preparation of electronic ceramic components, in particular to a whole-series lead-free barium titanate thermistor with the Curie point of 60-125 DEG C and a preparation method of the whole-series lead-free barium titanate thermistor. The whole-series lead-free barium titanate thermistor is prepared from the following raw materials in parts by mole: 0.99 part of a frit material, 0.01 part of sodium bismuth titanate and 0.001-0.008 part of lithium carbonate, the frit material is prepared from the following components in parts by mole: 0.669 to 0.868 part of barium carbonate, 0.10 to 0.181 part of calcium carbonate, 0.011 to 0.153 part of strontium carbonate, 0.0023 to 0.0032 part of yttrium oxide, 0.002 to 0.01 part of aluminum oxide, 0.0005 to 0.0012 part of manganous nitrate, 0.008 to 0.02 part of silicon dioxide and 0.992 to 1.3 part of titanium dioxide. According to the invention, BNT and strontium titanate are added at the A site at the same time, and lead titanate is replaced by BNT, so that the lead-free whole series of thermistors at the temperature of 60-125 DEG C is realized.

This disclosure provides alloy powder for additive manufacturing, its preparation method, and alloy parts; the preparation method includes: mixing an initial raw material powder with reinforcing nanoparticles in a set proportion to obtain a mixed raw material powder; placing the mixed raw material powder in a sleeve and obtaining an alloy rod to be melted by hot isostatic pressing; performing induction melting on the alloy rod to be melted to obtain a raw material melt; and performing gas atomization treatment on the raw material melt to prepare alloy powder.