5results about How to "Overcome uniformity issues" patented technology

The invention belongs to the technical field of synthesis and preparation of aluminum nitride, and discloses a controllable and extensible preparation method of a one-dimensional aluminum nitride nanowire / nanotube, which comprises the following steps: (1) uniformly mixing a solid aluminum source and a solid nitrogen source, transferring the mixture into a rotatable crucible, transferring the crucible into a tubular furnace, sealing the tubular furnace, and carrying out heat preservation for 2-3 hours; vacuumizing and then introducing protective gas; (2) under the condition that protective gas is continuously introduced, the tubular furnace is heated to a preset target temperature for a nitridation reaction, and the nitridation reaction is carried out under the condition that a crucible rotates at a constant rotating speed; and after the reaction is finished, cooling the tubular furnace and stopping the rotation of the crucible to obtain a one-dimensional aluminum nitride nanowire or nanotube product. According to the method, the solid aluminum source and the solid nitrogen source are used as raw materials, and the crucible rotation is introduced during the nitridation reaction to carry out dynamic enabling improvement, so that the single-crystal aluminum nitride nanowire or nanotube with high purity and uniform morphology can be efficiently synthesized.

This invention provides a nano-tellurium / carbon composite material and its preparation and application. The nano-tellurium / carbon composite material comprises reduced graphene oxide and tellurium nanorods dispersed within the reduced graphene oxide; the tellurium nanorods are embedded within the reduced graphene oxide. This invention uses tellurium hydride as a reducing agent and tellurium source, and GO as an oxidant and loading material, resulting in a uniform distribution of tellurium nanorods within the rGO composite material, overcoming the problems of easy agglomeration and uneven dispersion of nano-tellurium materials. The composite material preparation method of this invention requires only a simple one-step process and can be completed in a short time, solving the problem of complex synthesis processes for various nano-tellurium / carbon composite materials, which is beneficial for the large-scale production of this composite material. Furthermore, this invention uses PVP as a surfactant, which results in the formation of small tellurium nanorods during the reaction process.

This invention discloses a piezoelectric self-renewing gradient ceramic catalytic membrane and its preparation method, belonging to the field of porous ceramic technology. The method includes the preparation of a porous piezoelectric ceramic substrate, LDH transition layer modification, and catalyst electrophoretic deposition. The catalyst electrophoretic deposition method involves dispersing the catalyst in a solvent, adjusting the suspension to make the catalyst particle surface positively charged, obtaining a catalyst suspension; using a ceramic substrate modified with a positively charged transition layer as the cathode and a graphite rod as the anode, immersing both electrodes in the catalyst suspension, controlling the distance between the two electrodes to 1.4-1.6 cm, connecting a constant voltage DC power supply of 20-40V, and depositing for 5-15 minutes. After deposition, the sample is removed and subjected to post-processing and polarization treatment to obtain the catalytic ceramic membrane product. This invention utilizes fluid pressure fluctuations to excite the piezoelectric effect, achieving in-situ mechanical exfoliation and self-renewal of catalytically activated and surface-deactivated catalysts, significantly improving catalytic efficiency and long-term stability.

This invention discloses a method for preparing high-density titanium alloy billets using a high proportion of recycled scrap, belonging to the field of titanium alloy billet preparation technology. The method includes: process calculation and batching, material pretreatment, weighing and mixing of small-particle materials, high-density billet forming, and billet stacking. This invention overcomes the technical bottleneck of high-proportion scrap pressing by combining small-particle materials with ultra-high tonnage rapid pressing, effectively addressing problems such as poor billet uniformity and poor forming effect, reducing billet density from the usual less than 3.0 g / cm³. 3 Increased to 3.2g / cm 3 The above represents a qualitative leap from difficult-to-form to high-density forming. While ensuring that the addition ratio is not less than 60%, strict particle size control and mixing process guarantee the uniformity of composition. The high-density billet improves the conductivity and melting stability of the electrode, reduces splashing during the melting process, and thus improves the metallurgical quality of titanium ingots.

The present application relates to non-ferrous metal processing technical field, specifically provide a kind of aluminium alloy sheet hot cold die composite heat treatment method.The aluminium alloy sheet hot cold die composite heat treatment method provided by the present application includes the following steps:S1.workpiece is placed in quenching device, and the workpiece is closed and clamped using upper and lower split heating die, is kept at 400-550 DEG C for 5-20min to carry out solid solution treatment;S2.the workpiece after solid solution treatment is transferred to cooling station, and the workpiece after solid solution treatment is closed and clamped using upper and lower split cooling die to carry out quenching treatment, and finished product is obtained;Wherein, the temperature of the upper and lower cooling die is controlled at 15-25 DEG C.The present application is by using the continuous processing mode of upper and lower split hot and cold die combination, so that the effective support of die is obtained in the whole process of solid solution and quenching for sheet, so that the deficiency of traditional air cushion furnace process in plate shape control and performance uniformity is successfully overcome, and then high-quality aluminium alloy sheet with flat plate shape and uniform structure can be stably prepared.