11results about How to "High sphericity" patented technology

This invention provides a spherical TC4 alloy fine powder, its preparation method, and its application, belonging to the field of alloy material preparation technology. The preparation method of the spherical TC4 alloy fine powder includes the following steps: S1: Hydrogenation pre-crack formation, using spherical TC4 coarse powder particles as raw material, heating to 700~1000℃ in a hydrogen atmosphere, and holding at that temperature for 20~90 min; S2: Preparing spherical TC4 titanium alloy powder using radio frequency plasma hydrogen explosion; the hydrogen explosion gas includes hydrogen and inert gas; S3: After ultrasonic separation of the spherical TC4 titanium alloy powder from step S2, the spherical TC4 alloy fine powder is obtained. This achieves an integrated technical route of TC4 powder refinement and hydrogen explosion spheroidization, obtaining MIM powder with high sphericity and high flowability.

This invention relates to a stabilizer for preparing polycaprolactone and its application. The stabilizer is an asymmetric block copolymer comprising polycaprolactone segments and carbonyl-dependent segments, with an anchor-to-solubility ratio of 0.5 to 5.0, wherein the anchor-to-solubility ratio is the ratio of the number-average molecular weight of the carbonyl-dependent segments to that of the polycaprolactone segments. When the stabilizer of this invention is used to prepare polycaprolactone, polycaprolactone microspheres with controllable particle size range, narrow particle size distribution, and high sphericity can be obtained.

The present application relates to sintered Nd-Fe-B magnet preparation technical field, more specifically, the present application relates to a kind of recycled sintered Nd-Fe-B magnet, it is characterized in that;The recycled sintered Nd-Fe-B magnet is prepared by composite magnetic powder by magnetic field forming, sintering and aging, the composite magnetic powder is obtained by mixing the recycled magnetic powder and conventional neodymium iron boron double alloy powder according to mass ratio 20%-40%:60%-80%;Wherein, the recycled magnetic powder is derived from waste sintered Nd-Fe-B magnetic block, is prepared by gas atomization powder processing process, particle size D50 is 3.0 μm-4.5 μm, oxygen content≤300ppm;The present application aims at realizing the resource recycling of waste magnetic block, while ensuring that magnet has low heavy rare earth dependence, high magnetic performance and high stability.The magnet is prepared by mixing the recycled magnetic powder and conventional neodymium iron boron double alloy powder according to specific proportion, recycled magnetic powder is obtained by waste magnetic block by gas atomization powder processing, and conventional neodymium iron boron double alloy powder is designed by multi-element component optimization.

The application discloses a kind of nano-composite ceramic particles modified aluminum alloy powder for 3D printing and preparation method thereof, belong to metal additive manufacturing material technical field.The powder is composed of 7XXX series aluminum alloy powder matrix and TiC and TiB2 nanoparticles attached to its surface.TiC nanoparticle addition amount is 0.3%~1% of total mass, TiB2 is 0.1%~1%, total addition amount is controlled at 0.4%~1%.Two kinds of nanoparticles are uniformly coated on the surface of aluminum alloy powder by low-energy ball milling process, and the "TiB2-Al3Ti-Al" efficient heterogeneous nucleation path is constructed.The application realizes grain ultra-fining and completely crack-free forming under very low ceramic content, while avoiding the plasticity decline and surface treatment performance degradation caused by excessive ceramic phase.The obtained powder has excellent comprehensive performance, and is suitable for the manufacturing of high-strength, high-surface quality components.

The application provides an amorphous nanocrystalline soft magnetic alloy powder and a preparation method and a magnetic powder core thereof, and relates to the technical field of soft magnetic materials. The preparation method of the amorphous nanocrystalline soft magnetic alloy powder adopts high-energy electric pulse technology to realize instantaneous rapid heating and explosion of the amorphous alloy material, and realizes accurate control of the powder particle size by accurately controlling energy input parameters and interval parameters, thereby preparing high-sphericity soft magnetic powder with a median particle size of 0.5-5 mu m, significantly improving the uniformity and dispersity of the powder, and solving the problem of low particle size control accuracy in the prior art. Moreover, the preparation method has a simple process flow and low energy consumption, avoids impurities and defects introduced in the traditional multi-step process, and improves the purity and performance of the material. The prepared amorphous nanocrystalline soft magnetic alloy powder has the characteristics of small particle size, high sphericity, high saturation magnetization, low coercivity and high yield, and is particularly suitable for the field of high-frequency magnetic elements and precision electronic devices.

The application relates to high-sphericity nano tetragonal barium titanate for MLCCs and a preparation method thereof. The technical scheme is as follows: a titanium source, a dissolving agent and potassium perchlorate are mixed to obtain mixed material A; the mixed material A is heated twice under air condition, is preserved, is naturally cooled to obtain a reaction product; the reaction product is washed with distilled water I, is separated, is dried to obtain titanium dioxide powder; the titanium dioxide powder and barium oxide are mixed to obtain mixed material B; the mixed material B, ethylene glycol, pure water and an anionic surfactant are mixed to obtain a mixed solution; the mixed solution is moved to a polytetrafluoroethylene reaction kettle, is placed in a microwave heating furnace, is heated, is preserved, is naturally cooled and is filtered; the filtered product is washed with distilled water II, is separated, is dried to obtain high-sphericity nano tetragonal barium titanate for MLCCs. The product prepared by the application has high purity, high sphericity, small particle size, good dispersity and high tetragonality.

The application relates to the technical field of sodium ion battery negative electrode materials, and discloses resin-based hard carbon microspheres for sodium ion batteries and a preparation method thereof, which comprises the following steps: mixing styrene, a crosslinking agent and a catalyst to prepare an oil phase, dispersing the oil phase in a polyvinyl alcohol aqueous solution, and preparing resin microspheres through micro-suspension polymerization; and then performing air atmosphere pre-oxidation and inert atmosphere carbonization treatment to obtain a target product. Through regulation and control of a micro-suspension polymerization formula and a step-by-step heat treatment process, a dense spherical structure with rich closed pores and a suitable interlayer spacing is constructed, and the technical problems of low tap density and easy melting collapse of pyrolysis of traditional resin-based hard carbon are effectively solved. The obtained hard carbon microspheres have uniform particle size distribution, extremely high tap density and excellent powder fluidity, simultaneously exhibit high reversible specific capacity, high initial efficiency and excellent rate cycle stability, and are suitable for large-scale commercial application.

This application discloses a post-processing technology and apparatus for ViGa gas atomization powder production. The process employs a four-step synergistic treatment: graded pre-separation, plasma desorption, vibration densification, and cooling shaping. First, a three-stage airflow classifier removes free fine powder. Then, radio frequency plasma bombardment desorbs attached satellite spheres and melts irregular protrusions on the powder surface. The powder is then densified and residual satellite spheres are removed via an ultrasonically vibrating fluidized bed. Finally, rapid cooling with inert gas shapes and fixes the spherical morphology. The apparatus integrates a feeding system, a grading module, a plasma module, a vibration module, a cooling module, and a control system, enabling precise control of process parameters. This application reduces the satellite sphere content in the powder to below 5%, increases sphericity to above 0.95, achieves a Hall flow rate ≤25s / 50g, a powder deformation rate <2%, and a single-batch energy consumption <200kW·h / ton. It is compatible with various ViGa gas atomization powders and solves the problems existing in the prior art.

This invention provides a method for preparing high-sphericity gold powder, relating to the field of nanomaterial preparation technology. The method involves sequentially adding a multi-ligand stabilizer solution and an acidic solution to a chloroauric acid solution, adjusting the pH of the reaction system to 4.0-5.0 to obtain solution A. Then, a dispersant solution is rapidly added to solution A for a first-stage mixing, followed by the rapid addition of a reducing agent solution for a second-stage mixing. Subsequently, a morphology-optimizing agent solution is added dropwise to the reaction system, and after sufficient reaction, the precipitate is collected to obtain high-sphericity gold powder. This invention achieves precise control of gold powder morphology through the competitive adsorption between ligands by adding a multi-ligand stabilizer to the chloroauric acid solution. Furthermore, the addition of an acidic solution to the chloroauric acid solution further consolidates the morphology control of the gold powder. The acidic pH of the solution after adjustment further slows down the reduction rate, resulting in better dispersibility and more uniform size of the gold powder.

This invention discloses a method for preparing L-carnosine spherical crystals, comprising the following steps: dissolving L-carnosine in a good solvent, water, to obtain an aqueous solution containing L-carnosine; controlling the temperature of the aqueous solution and continuously stirring; adding a poor solvent to the L-carnosine-containing aqueous solution to precipitate L-carnosine spherical crystals; and separating and drying the spherical crystals to obtain the L-carnosine spherical crystals. The good solvent is water; the poor solvent is N,N-dimethylformamide and / or dimethyl sulfoxide. The preparation process of the L-carnosine crystals prepared by this invention is simple, involving only water and a poor solvent, and the process is straightforward. The particle size can be adjusted by the concentration of the aqueous solution and the stirring rate, resulting in an average particle size of 50–200 μm. The product particles are rounded, have high flowability, an angle of repose of 30°–37°, and a bulk density of 0.4–0.7 g / cm³. 3 This solved the problems of poor crystal morphology and poor particle flowability of L-carnosine.

The application discloses a kind of micro-jet continuous preparation methods of micro-pleated spherical silver powder, to solve the problem that traditional stirring reaction method is difficult to continuously prepare high sphericity, high dispersibility and surface has regular micro-pleated structure silver powder using micro-jet mixing reaction mode.The method comprises: configuration and filtration silver precursor and reducing agent solution;Temperature is controlled to 15-35 DEG C respectively;Two solutions are pumped into Y type micro-jet reactor with flow ratio 1:1 by metering pump, and high-speed collision mixing is formed at a certain flow and angle at the reactor outlet, efficient mixing and reaction are realized;Add total addition amount is 1% of silver nitrate weight Gelatin and stearic acid as dispersion stabilizer to inhibit agglomeration and control wrinkle morphology;After suction filtration, washing and vacuum drying, the product is obtained.By using the above technical scheme, continuous, high-stability preparation of micro-pleated high-sphericity silver powder can be realized, and the process method is easy to expand production by modularization.