3results about How to "Improve loss performance" patented technology

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 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.

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.