9results about How to "High saturation magnetization" patented technology

This application discloses a soft magnetic powder composite, a magnetic powder core material, and an insulating coating method based on organic growth, belonging to the field of soft magnetic materials technology. The soft magnetic powder composite of this application includes soft magnetic powder and an insulating coating layer, with the insulating coating layer encapsulating the soft magnetic powder. The insulating coating layer is prepared by a crosslinking reaction of dopamine hydrochloride (hereinafter referred to as dopamine) and polyethyleneimine. The soft magnetic powder is selected from metals and / or alloys containing Fe. The insulating coating method of this application has low hazard, achieves high stability within a certain temperature range, features scalable and controllable insulating film thickness, high film uniformity, and effectively isolates interparticle eddy currents. Simultaneously, the insulating coating layer has strong adhesion, reducing the amount of insulating adhesive used, facilitating molding, reducing the dilution effect of non-magnetic phases, and further improving the magnetic properties of the matrix.

This invention relates to a high-power, low-loss Li-based microwave ferrite for LTCC and its preparation method, belonging to the field of electronic ceramics technology. The ferrite, based on its respective standard components, contains the following content: Li₂CO₃ 11.80–12.24 mol%, ZnO 19.87–20.41 mol%, TiO₂ 10.78–11.08 mol%, Mn₃O₄ 0.39–2.65 mol%, Co₃O₄ 0.04–0.58 mol%, Fe₂O₃ 54.70–56.18 mol%, and Bi₂O₃ 0.09 mol%. This invention introduces high-valence Mn ions into the Li-based microwave ferrite, altering the ferrite grain size distribution, particularly increasing the proportion of fine grains, thus improving the spin linewidth. Based on grain refinement, the introduction of an appropriate amount of Co ions with rapid relaxation characteristics further enhances the ferrite's spin linewidth.

The invention discloses a variable range magnetic sensor based on a magnetic shielding effect and application, the variable range magnetic sensor comprises a magnetic shielding sleeve, a printed circuit board and a magnetoresistance sensing chip, the magnetic shielding sleeve is embedded in the printed circuit board, and the magnetoresistance sensing chip is arranged on the printed circuit board and located in the magnetic shielding sleeve. A single-layer double-opening permalloy magnetic shielding sleeve is nested on a PCB (Printed Circuit Board), and a magnetoresistance sensing chip is arranged in the magnetic shielding sleeve. The structure is designed to be used for increasing the measuring range of the magnetoresistance sensing chip, and dynamic adjustment of the measuring range of the sensor is achieved by adjusting the position and the thickness of the magnetic shielding sleeve. The sensor described by the invention can be better applied to a scene with a wide dynamic magnetic field range, and has better nonlinearity and anti-interference capability.

The invention relates to an iron-based gyromagnetic material calculated based on a first principle and a screening method thereof, the crystal structure of the material is a garnet structure, and the chemical general formula of the material is Sr < x > Y < 3-x > Scy Fe < 5-y > O < 12 >, the value range of x is 0 lt; xlt; 3, the value range of y is 0 lt; yt; Yt; 5. On the basis of a first principle calculation result, a specific doping combination capable of remarkably improving the dielectric constant and improving the saturation magnetization intensity is screened out, namely, a double-ion co-doping strategy that c site is replaced by Sr and a site is replaced by Sc is adopted. According to the method, experiments are guided through theoretical calculation, the problems that a traditional trial-and-error method is long in period and large in blindness are effectively solved, and the iron-based gyromagnetic material with excellent electromagnetic performance is obtained.

The invention discloses an immunomagnetic composite material and application thereof in a neurofilament light chain protein kit. The preparation process of the immunomagnetic composite material comprises the following steps: preparing Fe3O4 nanoclusters by a hot solvent method, coating the Fe3O4 nanoclusters with dense silicon oxide to obtain silicon oxide magnetic beads, preparing mesoporous silicon oxide magnetic beads by a template method, carboxylating the mesoporous silicon oxide magnetic beads, and preparing the immunomagnetic composite material. The surface of the carboxylated mesoporous silica magnetic bead is coated with a neurofilament light-chain protein capture antibody to obtain the immunomagnetic composite material. The immunomagnetic composite material is used in a mesoporous magnetic particle chemiluminescence detection neurofilament light-chain protein kit for neurofilament light-chain protein detection, has the characteristics of low detection limit, good specificity, high sensitivity, simplicity, convenience and feasibility, and is suitable for large-scale and batch sample detection.

This invention discloses a cobalt-based Hassler alloy material, its preparation method, and its application. The preparation method includes the following steps: (1) Weighing cobalt powder, iron powder, and germanium powder in a molar ratio of 2:(1~1.75):(0.25~1), mixing them, placing them in a tungsten carbide grinding jar, adding anhydrous ethanol, adding grinding balls, and ball milling; (2) Drying and sieving the ball-milled powder, taking the sieved magnetic alloy powder, sealing it in a vacuum quartz tube, heat-treating it using a muffle furnace, and cooling it to room temperature with the furnace to obtain a cobalt-iron-germanium Hassler alloy. This invention uses a ball milling method, which can effectively change the surface morphology of the alloy powder, making it form a flake powder with a larger specific surface area, thereby improving the electromagnetic absorption performance of the magnetic alloy; by selecting and changing the proportion of the Hassler alloy components, the saturation magnetization of the magnetic alloy can be effectively increased, its Curie temperature can be increased, and the electromagnetic wave absorption performance of the magnetic alloy at high temperatures can be improved.

The embodiment of the application provides a magnetic ternary Fe-S / Fe3O4@N / S-C nanocomposite material and a preparation method and application thereof, the nanocomposite material constructs a Fe-S / Fe3O4 heterojunction in a N / S co-doped carbon frame in situ, so that the agglomeration of nanoparticles and the dissolution of metal ions are effectively prevented; then by regulating the iron active center to be a Fe(III) species with a medium spin state, the iron-based nanocomposite material can efficiently activate PMS in a non-radical pathway, and the degradation efficiency of organic pollutants in sewage is improved; and the nanocomposite material can exhibit excellent catalytic degradation performance in a wide range of pH 3-12, and can realize more than 96% removal rate of various organic pollutants such as rhodamine B, tetracycline, orange II and the like within 15-25 minutes, effectively overcoming the defects that the traditional Fenton system is only applicable under acidic conditions and is easily disturbed by the background material of water.

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 invention relates to the technical field of amorphous alloy mechanical and magnetic coupling, and discloses a method for preparing an iron-based amorphous alloy with high toughness and plasticity and excellent magnetic performance through high-throughput monitoring, and the method comprises the following steps: high-throughput preparation, parallel high-throughput detection, performance association and component locking, and component data according to a target component area. According to the method, the research and development efficiency and the performance screening precision of the iron-based amorphous alloy are greatly improved, organic combination of high toughness and plasticity and excellent magnetic performance is successfully achieved through scientific component design and process control, and application and development of the iron-based amorphous alloy in the field of high-end soft magnetic materials are promoted. The method has wide popularization value and application prospect, and can provide powerful technical support and theoretical guidance for material innovation in related fields.