4results about How to "Good sphericity" patented technology

This invention relates to the field of nanomaterials technology, specifically to a method for preparing silica using continuous flow. The method involves mixing an organic base, a surfactant, and water to obtain solution A; mixing a silicon source and an organic solvent to obtain solution B; reacting solutions A and B through a continuous flow apparatus, separating the solid product, and calcining it to obtain silica; wherein the flow rates of solutions A and B are 5-10 mL / min, and the reaction temperature is 20-45℃. In this method, silica is prepared using a continuous flow process, and the prepared silica has a nanosphere morphology with a specific surface area of ​​200-800 m². 2 / g, with a pore size distribution of 2-50 nm and a particle size distribution deviation (PDI) of less than 2%.

This invention provides an MC-type carbide-reinforced Nb-based alloy spherical powder, its preparation method, and its application, belonging to the field of metal material preparation technology. The invention involves distributing the MC-type carbide-reinforced Nb-based alloy spherical powder according to its composition, followed by suspension induction melting and casting to obtain a master alloy ingot. The master alloy ingot is then machined to obtain an Nb-based alloy electrode rod. Using the Nb-based alloy electrode rod as raw material, powder is produced by plasma rotating electrode atomization to obtain the MC-type carbide-reinforced Nb-based alloy spherical powder. The MC-type carbide-reinforced Nb-based alloy spherical powder prepared by the method of this invention has uniform composition, controllable particle size with a narrow distribution range, good sphericity, low O and N content, and high purity, making it suitable for additive manufacturing.

This invention discloses a method for preparing high-density, large-particle-size spherical alumina powder, belonging to the field of inorganic non-metallic material preparation technology. The method uses industrial aluminum hydroxide or industrial alumina containing a transition phase as raw material. It involves introducing 1-10% α-alumina seed crystals and 1.0-3.0% composite mineralizer (containing boron and fluorine sources) by mass of the raw materials. After mechanical mixing, the mixture is calcined in air at 1350-1550℃ for 2-8 hours. Finally, the mixture is cooled, dispersed, and sieved to obtain the final product. This invention, through the synergistic effect of seed crystals and composite mineralizer, simultaneously achieves α-phase transformation, densification, grain growth, and morphology control of alumina powder under mild calcination conditions. It successfully prepares alumina powder with an α-phase content ≥96%, true density >3.96 g / cm³, median particle size D50 ≥50 μm, and a regular spherical morphology. This method is simple, low-cost, and the product is suitable for high-filling thermally conductive fillers, showing great promise for industrial application.

This invention discloses a nozzle atomizing device for preparing spherical metal powder, belonging to the field of metal powder technology. The nozzle of this invention features an optimized internal flow channel structure and is made of high-temperature resistant material, which improves the quality and consistency of the metal powder. It includes a molten metal container; a stepped liquid guide tube connected to the outlet of the molten metal container; an inner nozzle with multiple circular holes arranged in a ring below the outlet of the stepped liquid guide tube; and an ultrasonic atomizing device. This invention employs a two-stage device with different structures, an optimized combination of injection angle and a stepped liquid guide tube, achieving a dual, strong atomization effect from the nozzle, which is beneficial for obtaining metal powder with good sphericity and high fine powder yield. The gas atomizing nozzle of this invention is suitable for the production of metal powder, especially in the field of additive manufacturing.