8results about How to "Avoid growing up" patented technology

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.

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 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 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 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.