16results about How to "Facilitate phase transition" patented technology

The invention discloses a method for preparing a FeMnSi alloy with a remarkable low-temperature shape memory effect through 3D printing, and the method comprises the following steps: 1, carrying out room-temperature rotary mixing on powder containing FeMnCrNiSi element components to obtain mixed powder; and secondly, the mixed powder serves as a raw material, and a metal powder bed selective laser melting 3D printing technology is adopted for preparing the block FeMnSi series alloy. By developing FeMnSi system alloy components with the characteristics of high Cr content, high Ni content and middle Si content, the stacking fault energy is effectively reduced, the defects of stacking fault, dislocation and the like in the FeMnSi system alloy are greatly improved, martensite phase transformation in the deformation process is promoted, and therefore good 3D printing process adaptability is achieved, the cracking risk is reduced, and the service life of the product is prolonged. And the material has obvious shape memory effect and tensile strength at low temperature, and is suitable for reusable impact-resistant, load-bearing and functional devices in polar space environment.

The invention provides a method for eliminating delta ferrite in austenitic stainless steel and the austenitic stainless steel, and belongs to the technical field of metal materials. The method comprises the following steps that an austenitic stainless steel ingot containing the delta ferrite is subjected to heat preservation for first set time at the first set temperature for first heat treatment; heating the austenitic stainless steel ingot subjected to the first heat treatment to a second set temperature, and carrying out heat preservation for a second set time at the second set temperature for second heat treatment; and cooling the austenitic stainless steel ingot subjected to the second heat treatment, or sequentially and repeatedly carrying out the first heat treatment and the second heat treatment on the austenitic stainless steel ingot subjected to the second heat treatment for at least one time, and then cooling to obtain the austenitic stainless steel subjected to delta ferrite elimination. The first heat treatment and the second heat treatment are performed, and the second set time is limited, so that the austenitic stainless steel is prevented from being in a high-temperature environment for a long time, and austenite grains are prevented from obviously growing.

The invention relates to the technical field of copper pipe heat dissipation, in particular to a micro-channel heat dissipation device based on a copper pipe structure, which comprises a heat dissipation substrate, a copper pipe type heat dissipation channel and a liquid cooling circulation system, the copper pipe type heat dissipation channel is composed of a plurality of plastic copper pipes and replaces a traditional micro-channel or vapor chamber structure. The copper pipe is embedded or fixed in the heat dissipation substrate or on the surface of the heat dissipation substrate, cooling liquid circulates in the copper pipe, and efficient heat dissipation is achieved through the combined action of forced convection heat exchange and heat transfer; the copper pipe has good plasticity and can be subjected to three-dimensional bending forming according to heat source distribution and spatial layout, through the synergistic effect of forced convection and phase change heat transfer, the heat transfer efficiency is improved, particularly, extremely high local heat flow density can be coped, the chip is effectively prevented from being overheated, and the heat transfer efficiency is improved. The heat dissipation channel can be bent and formed in a three-dimensional space according to heat source distribution, accurate matching with the heat source form is achieved, limitation of traditional plane heat dissipation is broken through, and optimal configuration of heat dissipation capacity and heat flux density is achieved.

The invention belongs to the technical field of high-entropy alloys, and particularly relates to a CoCrNi series high-toughness high-density twin boundary medium-entropy alloy and a preparation method thereof. Aiming at the situation that the traditional alloy component design field lacks mature and reliable design principles, the invention provides three component design principles: high elastic modulus, low stacking fault energy and proper phase stability. Based on the three principles, the general formula of the non-equal-atomic-ratio medium-entropy alloy is CoaCrbNic, 30 < = a < = 37, 30 < = b < = 35, and 28 < = c < = 40. A metal raw material with the purity being 99.5% or above is polished and cleaned and then smelted into a cast ingot in a vacuum arc furnace, and then the medium-entropy alloy with high strength and toughness and the high-proportion twin boundary can be obtained after solid solution, hot rolling and recrystallization annealing processes are conducted. The design principle can also be popularized to other alloy systems, operation is easy, the production period is short, safety and reliability are achieved, and wide application prospects are achieved.

The invention relates to an aminophospholipid lipid molecule compound, a compound as shown in a chemical formula (I), or pharmaceutically acceptable salt, prodrug and # imgabs0 # thereof. The invention also discloses a preparation method of the compound and application of the compound as a delivery treatment component in preparation of drugs.

The invention discloses a perovskite precursor solution, a perovskite active layer prepared from the perovskite precursor solution and application of the perovskite active layer. The perovskite precursor solution contains a mixture of formamidine thiocyanate (FASCN) and rubidium thiocyanate (RbSCN). According to the invention, the mixed additives formamidine thiocyanate FASCN and rubidium thiocyanate RbSCN are added into the precursor solution to effectively promote phase transformation from an inactive phase delta to an active phase alpha, so that the efficiency and the stability of the methylamine-free perovskite battery are remarkably improved, and the methylamine-free perovskite battery has a relatively good commercial application prospect.

The utility model relates to a multi-way valve for refrigerants, a heat management system and a vehicle. The multi-way valve comprises a valve body and a valve element. The valve element is rotatably connected to the valve body, valve ports are formed in the valve body, and the valve ports comprise the first valve port, the second valve port and the third valve port; the valve element is arranged in the mode that the first valve port can be partially communicated, and / or the second valve port can be completely communicated or cut off, and / or the third valve port can be completely communicated or cut off. According to the multi-way valve, one valve can be connected with a plurality of pipelines, meanwhile, the multi-purpose effect of one valve can be achieved, the existing matching mode of a stop valve and an expansion valve can be replaced, the space occupied by the valve is reduced, meanwhile, the number of the valves is reduced, and cost is reduced.

The invention provides a monitoring method and device for the temperature control process of phase change copper foil deposition equipment. The monitoring method comprises the steps that the electrolyte temperature, the copper foil surface temperature and the heat flux density penetrating through an inactivation product layer are obtained; identifying the temperature difference change between the electrolyte temperature and the copper foil surface temperature, and extracting the offset of the temperature difference ratio along with time; performing temperature interval matching on the time stamp of the transition time node and a phase change interval reference, determining a starting point of a buffer layer entering function of an inactivated product layer, and generating a dynamically adjusted temperature control target value; and predicting the change trend of the subsequent heat flux density according to the dynamically adjusted temperature control target value, generating a feedback signal, transmitting the feedback signal to deposition equipment control, and realizing real-time compensation on the product accumulation influence.

This invention discloses a batching process for producing autoclaved aerated concrete (AAC) bricks. In this invention, secondary acid-washed brown corundum, primary alum, and dense white corundum are added to the raw materials for AAC brick production. This improves the impact resistance of the resulting AAC bricks and makes their surface smoother and more aesthetically pleasing, thus enhancing the overall appearance and durability of the bricks during use. Furthermore, the addition of calcium lignosulfonate solution to these raw materials promotes phase transformation and sintering, reducing firing time and increasing firing speed. This allows the method to be suitable for large-scale production, improving economic efficiency. The addition of wear-resistant agents to the anti-corrosion powder enhances the corrosion resistance and wear resistance of the concrete bricks, extending their normal service life.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a bar for a desert deep well and a preparation method of the bar, the bar for the desert deep well comprises the following chemical components in percentage by weight: 0.19-0.22% of C, 0.15-0.35% of Si, 0.45-0.55% of Mn, less than or equal to 0.010% of P, less than or equal to 0.001% of S, 0.45-0.55% of Cr, 0.70-0.80% of Mo, 0.02-0.05% of Nb, 0.09-0.11% of V, 0.01-0.025% of Al, 0.01-0.025% of Ti, 0.0015-0.0025% of B, less than or equal to 0.15% of Cu, less than or equal to 0.15% of Ni, less than or equal to 0.020% of Sn, less than or equal to 0.020% of As, less than According to the invention, reasonable component design is carried out on the bar material, so that the bar material has better corrosion resistance and hydrogen induced cracking resistance, and the bar material is suitable for extreme weather in desert areas, and is especially suitable for oil wells with the depth of more than 5000 meters.

This invention provides a multi-metal-doped sodium-ion battery cathode material, its preparation method, and its application, relating to the field of cathode materials. The method for preparing the multi-metal-doped sodium-ion battery cathode material of this invention, wherein the cathode material has the chemical formula NaLi, is described in this invention. x Ni y Fe 0.2 Mn z Ti n O2, x=0.05-0.15, y=0.25-0.35, z=0.25-0.35, n=0.05-0.15, x+y+z+n=0.8, includes the following steps: (1) the precursors of the above stoichiometric sodium source and transition metal source are mixed by ball milling wet grinding to obtain a uniformly mixed powder; (2) the uniformly mixed powder is subjected to high-temperature calcination in air atmosphere to form a target layered structure, thereby obtaining a multi-metal doped sodium-ion battery cathode material. The novel molar ratio O3-type layered cathode material provided by this invention has a multi-metal synergistic effect, which can effectively improve the phase transition process of the material during charging and discharging, so that it exhibits high specific capacity, excellent rate performance and long cycle life at different cutoff voltages (4.0 and 4.3V), and has a bright application prospect.

The invention relates to the technical field of electronics, in particular to a Wiegand filament preparation process based on low-density current. The preparation process comprises the following steps: S1, uniformly mixing 14-16 parts of iron, 3-5 parts of cobalt and 1-5 parts of nickel alloy, putting 0.02-1 part of neodymium or dysprosium into a smelting furnace, uniformly mixing to obtain molten alloy liquid, refining the molten alloy liquid, pouring the molten alloy liquid into a mold, and cooling and solidifying to obtain an alloy sheet; s2, processing the alloy sheet into an alloy wire; s3, the alloy wire is subjected to annealing treatment under the nitrogen atmosphere; s4, when the temperature of the annealed wiegand filaments is reduced to 500 DEG C, applying low-density current to the annealed wiegand filaments, and repeating for 1-3 times; and S5, after the wiegand filaments are cooled, cutting the wiegand filaments into required lengths, and packaging the wiegand filaments. The invention provides a Wiegand filament preparation process based on low-density current, and aims to solve the problems that the stability is poor in a high-temperature environment, and current transmission and conductivity cannot meet the rapid signal transmission requirement in the related technology.

The invention relates to spherical alpha-Al2O3 nanocrystals and a preparation method thereof. The preparation method comprises the following steps: S1, preparing materials; the preparation method comprises the following steps: preparing a PVP / SiO2 composite medium carrier solution: dispersing nano silicon dioxide in deionized water, and uniformly dispersing the nano silicon dioxide through ultrasonic treatment; adding polyvinylpyrrolidone (PVP) into the obtained dispersion liquid, and stirring until the PVP is completely dissolved to obtain a PVP / SiO2 composite medium carrier solution; preparing an aluminum ion solution: taking high-purity inorganic aluminum salt as a precursor, and dissolving the aluminum salt in the PVP / SiO2 composite medium carrier solution to obtain the aluminum ion solution; step S2, precipitation reaction; s3, heat treatment; and S4, washing and drying are carried out, and the spherical alpha-Al2O3 nanocrystal grains are obtained. The preparation method has the advantages that uniform adsorption and hydrolysis reaction of aluminum ions are effectively guided through introduction of the PVP / SiO2 composite medium carrier, formation of spherical aluminum hydroxide precipitates is promoted, then the spherical aluminum hydroxide precipitates are converted into spherical alpha-Al2O3 nanocrystals with uniform morphology after high-temperature heat treatment, and the morphology, the particle size and the purity of the alpha-Al2O3 nanocrystals are effectively and remarkably improved.

The application relates to the technical field of composite materials and discloses a protein separation special precise ultrafiltration membrane and a preparation method thereof, which comprises the following steps: S1: polyether sulfone, zinc oxide, glycerol, acetone and a solvent are added into a reaction kettle to be configured into a mixed solution, and the mixed solution is stirred and heated; S2: the mixed solution prepared in S1 is uniformly stirred, vacuum defoaming treatment is carried out, and an ultrafiltration membrane casting solution is prepared; S3: the casting solution in S2 is extruded from a ring-shaped spinneret through a metering pump, warm and humid air is introduced into the inner cavity of the ring-shaped spinneret, the air enters a gel tank, is phase-separated and solidified to be a hollow fiber membrane, the initial polyether sulfone hollow fiber ultrafiltration membrane is obtained through traction and winding; and S4: the initial polyether sulfone hollow fiber ultrafiltration membrane in S3 is cleaned with pure water, is hung and dried in a dehumidification room with certain temperature and humidity, and the hollow fiber special ultrafiltration membrane is prepared; the application has the following advantages and effects: the finished product has better hydrophilicity, higher pure water flux and more precise separation effect.

The invention provides a high-toughness cubic boron nitride composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, mixing cubic boron nitride powder and silicon nitride powder according to different proportions, and carrying out pretreatment; then, the mixture is subjected to synthesis treatment under the conditions of high temperature and high pressure, the specific synthesis pressure is 5 GPa, and the temperature range is 1000-1800 DEG C; and then, carrying out heat and pressure preservation for a period of time, cooling and relieving the pressure to obtain the cubic boron nitride and silicon nitride composite material. By adjusting the proportion of the silicon nitride and the transformation (alpha-phase to beta-phase) of the crystal phase of the silicon nitride, the toughness of the cubic boron nitride is remarkably improved on the premise that the hardness of the cubic boron nitride is not remarkably reduced, so that the contradiction between the hardness and the toughness of the superhard material is effectively solved. The method is simple in process and suitable for industrial production, and the obtained composite material has wide application potential in precision cutting and other high-requirement industrial processing.

This invention discloses a high-strength earthquake-resistant steel bar, relating to the field of building steel technology. It is composed of the following components by weight percentage: C: 0.16-0.19%, Si: 0.35-0.50%, Mn: 1.25-1.40%, V: 0.025-0.035%, N: 0.0060-0.0085%, Cu: 0.18-0.25%, Cr: 0.25-0.35%, Mo: 0.04-0.08%, composite rare earth: 0.010-0.018%, B: 0.0010-0.0020%, Ti: 0.008-0.015%, with the remainder being Fe. Impurity content is controlled as follows: P≤0.020%, S≤0.008%, O≤0.0020%. The sum of the weight percentages of all components is 100%. The steel bars prepared by this invention have good mechanical properties and corrosion resistance, and can meet the stringent seismic requirements of high-intensity earthquake zones.