9results about How to "Improve loss performance" patented technology

The invention discloses a preparation method of an iron-silicon-based composite soft magnetic powder core, which comprises the following steps: compounding and uniformly mixing iron-silicon-titanium powder and iron-silicon powder, and carrying out heat treatment in an air atmosphere; and then performing insulation coating on the surface of the magnetic powder by using a polyvinyl alcohol aqueous solution and a nano oxide, and performing compression molding and heat treatment to prepare the iron-silicon-based composite soft magnetic powder core. Compared with a conventional iron-silicon powder core, the iron-silicon-based composite soft magnetic powder core prepared through the method has the advantages that the direct-current bias performance under the condition of 100 Oe is higher than 76%, the volume loss Pcv under the conditions of 50 kHz and 100 mT is lower than 500 mW / cm < 3 >, and the loss performance is obviously improved.

The invention provides a high-inductance copper-iron co-fired inductor which comprises soft magnetic metal powder, a copper conductor and a nanocrystalline strip, the copper conductor and the nanocrystalline strip are vertically connected and buried in the soft magnetic metal powder, and the two ends of the copper conductor extend out of the soft magnetic metal powder; the soft magnetic metal powder comprises mixed powder of gas atomized iron-nickel-molybdenum powder with different particle sizes, a passivating agent, a coating agent and a lubricating agent. The passivating agent is a mixed solution of oxalic acid and nitric acid; the coating agent is an acetone solution of fluorosilicone resin, titanium trifluoride, aluminum trifluoroacetyl pyruvate and nano barium titanate; the lubricant is a mixture of gas-phase aluminum oxide and niobium diselenide; the thickness of the nanocrystalline strip ranges from 1 micrometer to 1.5 micrometers, and the width of the nanocrystalline strip ranges from 2 mm to 4 mm. According to the inductor, the inductance value of the inductor reaches the highest value by utilizing the gas atomization iron-nickel-molybdenum powder with the highest magnetic conductivity in the soft magnetic metal powder, and meanwhile, the gas atomization iron-nickel-molybdenum powder has very low loss and excellent stability, so that the inductor has good loss performance and excellent reliability at the same time.

The invention discloses a magnetic powder core and a preparation method thereof, belongs to the technical field of magnetic powder cores, and overcomes the defect that loss of the magnetic powder core is remarkably increased under the high-temperature working condition in the prior art. The preparation method of the magnetic powder core comprises the following steps: S1, preparing magnetic powder; the magnetic powder is iron-nickel-aluminum alloy soft magnetic powder and comprises, by mass, 37%-42% of iron, 60%-64% of nickel and 2.5%-3% of aluminum. S2, performing heat treatment on the magnetic powder under the action of pressure; s3, carrying out coating treatment on a product obtained in S2; s4, performing compression molding on a product obtained in S3 to obtain a blank; and S5, the blank is subjected to heat treatment, and the magnetic powder core is obtained. The magnetic powder core has the negative loss temperature coefficient within a certain range, and the problem that the loss performance of a conventional iron-nickel magnetic powder core is deteriorated at the high temperature is solved.

The invention provides a composite insulating layer of a light superconducting cable and a preparation method and application of the composite insulating layer. The composite insulating layer is prepared from the following raw materials in parts by weight: 40-60 parts of fusible polytetrafluoroethylene, 30-50 parts of fluorinated ethylene propylene, 0.5-5 parts of an auxiliary agent, 1-5 parts of filler and 0.1-0.6 part of a nucleating agent. The composite insulating layer of the light superconducting cable has relatively high tensile strength, relatively low dielectric constant and dielectric loss factor, good mechanical property and high insulating strength; compared with the prior art, the composite insulation layer has the advantages of low average cell diameter and high cell density, which indicates that a uniform and fine cell structure is formed in the composite insulation layer, the overall density of the material can be effectively reduced, the insulation layer is light, and the composite insulation layer can be applied to preparation of light superconducting cables for medical equipment and realizes integrity and low loss of high-frequency signal transmission.

The present application relates to a method for processing cords for reinforcing layers of semi-steel radial tires and tires for new energy vehicles, belonging to the technical field of vehicle tires. The method comprises the following steps: S1, twisting PEN yarn and PA6.6 yarn twice in the opposite direction of their pre-twisted direction to form a composite cord, and the composite cord has a twist coefficient within the range of 100-150 and a shrinkage rate within 0-0.5% at 100°C and a shrinkage rate within 0-1.5% at 180°C, and the linear density of the composite cord is 2000-3000 dtex; S2, first immersing the composite cord in a first adhesive, drying at 100-120°C for 1-2 minutes, then immersing it in a second adhesive, and drying at 130-150°C for 1-5 minutes; S3, placing the dried composite cord in the range of 190-210°C for thermal bonding, the thermal bonding process takes 80-120 seconds, and in the thermal bonding process, the elongation of the composite cord is 0.5-1.5%. The cord layer prepared by the cord treated in the present application can be used as a tire reinforcement layer to significantly improve the heat resistance and adhesion of the tire and the high-speed durability in a high-speed environment or a high-load environment.

The present invention provides a three-dimensional porous composite material and a preparation method and electromagnetic microwave absorption application thereof, which relates to the field of electromagnetic microwave absorption of nanocomposite materials. In the present invention, a divalent transition metal ion TM is first used. 2+ , such as Co 2+ As a crosslinker, Ti3C2T x Adding transition metal ion solution into MXene suspension induces Ti3C2T with negative potential. x MXene nanosheets rapidly gel to form MXene / Co via electrostatic interactions 2+ The hydrogel is further freeze-dried and vulcanized under pyrolysis conditions to form a lightweight MXene / CoS aerogel composite material. The unique three-dimensional porous structure is conducive to meeting the important prerequisite of electromagnetic waves entering the interior of the microwave absorber, and Ti3C2T x MXene as a conductive skeleton is beneficial to improve the charge transport capacity. At the same time, the in-situ converted CoS nanoparticles are anchored in the three-dimensional Ti3C2T x On the MXene skeleton, non-uniform heterogeneous interfaces and defect-induced dipole polarization sites are formed, which further enhance the dielectric polarization ability of the composite material and improve the loss capacity of electromagnetic waves.

The application discloses a preparation method of a transition metal oxide and / or transition metal sulfide / carbon cloth composite wave-absorbing material, and belongs to the technical field of wave-absorbing materials. The method comprises the following steps: dissolving metal salt and sodium citrate in a mixed solvent to obtain a mixed solution; immersing hydrophilic carbon cloth treated by acid in the mixed solution, and then moving to a hydrothermal kettle for heat preservation treatment to obtain a transition metal oxide / carbon cloth; dissolving a sulfur-containing compound in an alcohol solution, immersing the transition metal oxide / carbon cloth in the alcohol solution containing the sulfur-containing compound, and then moving to the hydrothermal kettle for heat preservation treatment; adjusting the temperature and time of the heat preservation treatment to control the content of sulfide in the product, and finally obtaining a transition metal oxide / sulfide / carbon cloth or a transition metal sulfide / carbon cloth. The application further discloses the obtained transition metal oxide and / or transition metal sulfide / carbon cloth composite wave-absorbing material. The method is simple, the micro-morphology and components of the obtained material are controllable, the material has excellent wave-absorbing performance, and has a wide application prospect.

The invention discloses a method for preparing a high-temperature resistant wave-absorbing film, and belongs to the field of material technology. Weigh an absorbent and a wave-transmitting substrate fiber, both of which are chopped fibers, and place them in a fiber disintegrator; weigh a binder and place it in the fiber disintegrator; set the rotation speed and dissociation time of the fiber disintegrator, add deionized water to the fiber disintegrator, and start the fiber disintegrator for dissociation; after the dissociation is completed, pour the mixed solution in the fiber disintegrator into a square paper sheet former, start the filtration program, and obtain a paper sheet; hot-press and dry the obtained paper sheet to remove excess water, and obtain a high-temperature resistant wave-absorbing film. The high-temperature resistant wave-absorbing film prepared by the invention has good high-temperature stability.

This invention belongs to the field of electromagnetic wave absorbing materials technology, specifically relating to a nickel-boron-doped cobalt-based layered carbon absorbing material and its preparation method. This invention utilizes a cobalt-based boron imidazole precursor framework as a template, and forms a two-dimensional layered layered double hydroxide (LDH) through a chemical oxidation etching process using nickel ions. This LDH is then subjected to high-temperature reduction to obtain the nickel-boron-doped cobalt-based layered carbon material. This material leverages the unique properties of two-dimensional materials to achieve high impedance matching, allowing electromagnetic waves to enter the absorber at a significant rate. Furthermore, the material's excellent dielectric polarization and magnetic coupling attenuate the electromagnetic waves entering the absorber. The material achieves a minimum reflection loss of -60.1 dB and a maximum effective absorption bandwidth of 6.24 GHz, giving it excellent electromagnetic wave absorption capabilities. The preparation method of this invention is simple and easy to mass-produce.