10results about How to "Low coercivity" patented technology

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 application relates to the technical field of magnetic particle imaging, and more particularly to an iron oxide nanoparticle and application of the iron oxide nanoparticle in magnetic particle imaging. The nanoparticle is an octahedral superparamagnetic ferroferric oxide nanoparticle, the nanoparticle is synthesized by adding a surfactant and controlling a reaction rate through a high-temperature thermal decomposition method, the surfactant includes oleic acid and oleylamine, the octahedral superparamagnetic ferroferric oxide nanoparticle is coated with an amphiphilic polymer, the amphiphilic polymer includes polymaleic anhydride-1-octadecenoic acid and polystyrene maleic anhydride copolymer, and the outer layer of the amphiphilic polymer includes biological membranes such as macrophage membranes, red blood cell membranes, neutrophil membranes and tumor cell membranes according to biological application requirements. The surface of the octahedral magnetic particle is a crystal face, the crystal face has low spin disorder and low anisotropy, so that the octahedral magnetic particle has the advantages of low coercivity and high initial magnetic susceptibility, and thus becomes a high-sensitivity magnetic particle imaging tracer.

This invention belongs to the field of stainless steel. Specifically, this invention relates to a fine-grained, high-strength, and high-toughness soft magnetic stainless steel synergistically strengthened by Ti and Cu, and soft magnetic stainless steel profiles containing the same. The soft magnetic stainless steel of this invention is composed of the elements Cr, Cu, Mo, Ti, C, Fe, and unavoidable impurities. In the preparation process of the soft magnetic stainless steel profile of this invention, according to the composition, the material is smelted and processed through steps such as solution treatment, hot rolling, cold drawing, recrystallization annealing, and aging. The process parameters in each step are strictly controlled to prepare a soft magnetic stainless steel profile with a fine and uniform microstructure, strengthened by trace carbide precipitation and high-density dispersed coherent nano-precipitates, and possessing excellent low-temperature toughness and soft magnetic properties. The fine-grained, high-strength, and high-toughness soft magnetic stainless steel profile synergistically strengthened by Ti and Cu of this invention can be effectively applied to solenoid valves and related products that operate in low-temperature media and require certain strength and toughness, and has good prospects for promotion and application value.

The application discloses a low-pressure forming high-frequency low-loss SMC magnetic powder core and a preparation method and application thereof, wherein amorphous iron-based alloy fine powder is added into iron-silicon-chromium coarse powder, different contents of nano calcium carbonate are added into the compounded magnetic powder, and then high-content epoxy resin is melted and mixed in a mixing mill to obtain a high-fluidity mixing material.After crushing, a low-pressure forming high-frequency low-loss SMC granular material is obtained, which is formed by hot pressing under low pressure, and the obtained annular magnetic powder core is annealed in a vacuum oven, so that the low-pressure high-frequency low-loss SMC magnetic powder core is obtained.Through the method, the SMC magnetic powder core with a forming pressure less than 50 MPa and a magnetic loss less than 2100 kW / m 3 under the conditions of 20 mT and 2 MHz can be obtained.

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 application discloses a preparation method of a soft magnetic material for a car fuel injection system, and optimizes and accurately controls alloy element proportioning, controls molybdenum content to improve corrosion resistance, optimizes smelting mode to improve sulfur content, improves cutting performance, optimizes rolling process, improves steel ingot-steel billet rolling ratio, improves sulfide distribution and shape, improves cutting performance and improves material original grain size, designs continuous furnace heat treatment process, simulates room furnace material different temperature section heating-heat preservation-cooling slow cooling process, improves production efficiency, and meets material technical indexes at the same time. The application has the beneficial effect that the preparation of a product with low coercive force, high magnetic permeability and high strength is realized, and the index requirements of the product with coercive force (Hcb) not more than 200 A / m, tensile strength (Rm) not less than 450 MPa, hardness (HRB) 80-90 and grain size not less than 4 levels under an applied magnetic field of 50000 A / m are met.

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.

This application discloses a rotor, a motor, a drive assembly, and a vehicle, belonging to the field of vehicle technology. The rotor has a first magnetic part and a second magnetic part, which are arranged at intervals along the circumference of the rotor, and the polarities of the first magnetic part and the second magnetic part are opposite; wherein, at least a portion of the coercivity of the second magnetic part is less than the coercivity of the first magnetic part.

This invention belongs to the field of magnetic functional materials technology, specifically relating to an amorphous nanocrystalline ribbon and its preparation method. The amorphous nanocrystalline ribbon is composed of the following raw materials in the indicated mass percentages: Nb 5.6-6.5 wt%, Si 9.5-10.5 wt%, B 1-2 wt%, Cu 0.5-1 wt%, Co 0.1-0.2 wt%, Zr 0.05-0.1 wt%, rare earth elements 0.4-1.5 wt%, high-entropy oxide 0.5-1.0 wt%, with the balance being Fe. The high-entropy oxide is prepared by adding ferric chloride, cobalt chloride, nickel chloride, manganese chloride, and scandium chloride to diethylene glycol, heating and stirring under sealed conditions, followed by centrifugation, washing, drying, and calcination to obtain the high-entropy oxide. The amorphous nanocrystalline ribbon prepared by this invention exhibits high magnetic permeability, low coercivity, and high stability within the temperature range of -40℃ to +150℃.

This invention relates to the field of thick and thin film materials for electronic components, specifically to a flexible thick and thin film magnetic core material for high-frequency current sensors used in power cable condition monitoring and its preparation method. The method involves preparing a main component target material using NiO, CuO, ZnO, and Fe2O3 powders as raw materials; and an auxiliary component target material using SiO2, La2O3, CaCO3, and BaTiO3 powders as raw materials. Combined with deposition process control and high-temperature sintering, a soft magnetic ferrite is prepared. A polyimide film is used as a flexible substrate material, and the soft magnetic ferrite material is completely adhered to the flexible substrate material to obtain the flexible thick and thin film magnetic core material. This material exhibits high permeability and low loss, which can significantly improve the detection level of power cables and has broad application prospects.