163results about How to "High saturation flux density" patented technology

A composite magnetic core formed of a high permeability material and a lower permeability, high saturation flux density material prevents core saturation without an air gap and reduces eddy current losses and loss of inductance. The composite core is configured such that the low permeability, high saturation material is located where the flux accumulates from the high permeability sections. The presence of magnetic material having a relatively high permeability keeps the flux confined within the core thereby preventing fringing flux from spilling out into the winding arrangement. This composite core configuration balances the requirements of preventing core saturation and minimizing eddy current losses without increasing either the height or width of the core or the number of windings.

An Fe-based amorphous alloy ribbon having a composition comprising FeaSibBcCd and inevitable impurities, wherein a is 76 to 83.5 atomic %, b is 12 atomic % or less, c is 8 to 18 atomic %, and d is 0.01 to 3 atomic %, the concentration distribution of C measured radially from both surfaces to the inside of said Fe-based amorphous alloy ribbon having a peak within a depth of 2 to 20 nm.

The electromagnetic clamp and method includes an electromagnet and a clamping piece located on opposite sides of a structure to clamp the structure. The electromagnet attracts the clamping piece through the structure when the electromagnet is energized, such that the electromagnet and clamping piece exert force on the structure, and an operation, such as drilling and/or fastener installation, may be performed on the structure. The configuration of the electromagnet creates the force necessary to securely clamp the structure. The electromagnet includes a coil and a core, and the core of the electromagnet is located within a longitudinal aperture that extends through the coil. The smallest lateral dimension of the core is chosen to maximize the flux density between the core and the clamping piece. As such, the smallest lateral dimension of the electromagnet may be greater than the distance between the clamping piece and the electromagnet.

The invention discloses a method of preparing a metal soft magnetic compound material by tape casting. The method mainly comprises the following steps: 1) mixing a passivant and a solvent according to a mass fraction of the passivant being 0.1-0.5% to obtain a passivation liquid, mixing the passivation liquid with magnetic metal powder according to a mass ratio of 0.01-1, stirring and drying to obtain passivation powder; 2) mixing the passivation powder with an organic solvent, a dispersant, a binder and a plasticizer, uniformly stirring, filtering through a screen and defoaming to prepare uniformly dispersed slurry; 3) tape casting; and 4) drying and curing. The method disclosed by the invention has the advantages that the metal soft magnetic compound material prepared by tape casting has the characteristics of high electrical resistivity and higher saturation flux density than conventional ferrite. By means of a mature tape casting process, the production process of the metal soft magnetic compound material is simplified and the cost is lowered; and the metal soft magnetic compound material has a wide application prospect in preparation of electron devices such as thin-film inductors.

To provide a soft ferrite which has a high saturation magnetic flux density of Bs at a high temperature of 100 DEG C or higher, especially at a temperature of 150 DEG C or so and deteriorates its magnetic properties less (even if sacrificing its low power loss property to some extent) at the above high temperature, especially deteriorates its core loss less, and is superior in magnetic stability. The major composition of ferrite core contains 56 to 57 mol% iron oxide in terms of Fe2O3, 5 to 10 mol% zinc oxide in terms of ZnO, 3 to 6 mol% in terms of NiO, and the residual mol% manganese oxide in terms of (MnO). When the major composition is expressed by: (Zn<2+>a, Ni<2+>b, Mn<2+>c, Mn<3+>d, Fe<2+>e, Fe<3+>f)O4+delta equation (1) (in the equation (1), a+b+c+d+e+f=3, and the relationship delta=a+b+c+(3/2)d+e+(3/2)f-4) the delta value in the equation (1) is in the range 0 <= delta <= 0.001.

This invention provides a sintering method for a high-saturated flux density MnZn ferrite including the following steps: a, a first temperature-rising stage, b, a second temperature-rising stage, c, a heat preservation stage, d, temperature-reducing, which can increase the saturated flux density of MnZn ferrite greatly by controlling the temperature and oxygen partial pressure during the sintering process, besides, no expensive asistant components are needed in the preparation process.

This multilayer coil part has a magnetic body section (2) that is made of an Ni-Zn system ferrite material and a Cu-based coil conductor (3) that has been wound into a coil shape. The coil conductor (3) is buried inside the magnetic body section (2) to form a part element body (1). The part element body (1) is divided into a first region (6) that is located close to the coil conductor (3) and a second region (7) that comprises the region other than the first region (6). The grain size ratio (D1/D2) between the average crystal grain size (D1) of the magnetic body section (2) in the first region (6) and the average crystal grain size (D2) of the magnetic body section (2) in the second region (7) is equal to or lower than 0.85. The molar quantity of CuO content in the ferrite material is set to 6 mol% or less, and the ferrite material is baked in a reductive atmosphere with the oxygen partial pressure being equal to or lower than the Cu-Cu2O equilibrium oxygen partial pressure. Thus, a multilayer coil part that exhibits not only little fluctuation of inductance and excellent thermal shock resistance when subjected to a thermal shock or an external stress but also excellent direct-current superposition characteristics can be obtained without requiring any complicated step.

Provided is an insulator-coated flat powder (2) that is for a magnetic member such as an electromagnetic wave absorber that is effective in blocking or absorbing electromagnetic waves in a frequency range of 1 MHz-50 GHz. The insulator-coated flat powder (2) is provided with flattened metal particles (4) and an insulating film (6) that is attached to the surface of the metal particles (4). The aspect ratio of the metal particles (4) is 10-300. The film (6) is a polymer that contains a titanium alkoxide. It is preferable that the ratio of the thickness of the film (6) to the thickness of the metal particles (4) in the powder (2) be 0.002-0.2. It is preferable that the titanium alkoxide in the powder (2) be an oligomer of a titanium alkoxide. It is preferable that the coverage rate of the metal particles (4) by the film (6) in the powder (2) be 20% or higher. It is preferable that the thickness of the film (6) in the powder (2) be 1 nm to 200 nm, and that the film (6) be an oxide of titanium.

The present invention discloses a Mn-Zn series ferrite and the preparing technique thereof. The raw material is prepared with the adjusting of the main formula and the adjusting of the kind and dosage of the adulterant (especially CoO is used). When the raw material is provided higher magnetic conductivity and stable magnetic conductivity change rate in broad temperature range, the raw material is provided with high saturation flux density. The range of the main formula of the material is as follows: Fe2O3 for 53.7-54.4mol, MnO for 36-38mol, and ZnO for 8-10mol The invention is mainly characterized in that the adding amount of CoO is 0.05-0.6wt Therefore the invention has the advantages of small initial permeability variation in broad temperature range and high saturation flux density. The technique of the invention is simple and can be actualized with generalization.

The invention discloses a low-consumption soft magnet ferrite material which comprises the following raw materials in parts by weight: 100 parts of a main material, 0.8-0.9 part of an auxiliary material and 6-8 parts of aids, wherein the main material comprises the following raw materials in parts by mole: 56-58 parts of Fe2O3, 30-33 parts of MnO, 8-9 parts of ZnO and 3-4 parts of NiO; the auxiliary material comprises the following raw materials in parts by weight: 2.5-3.5 parts of CaO, 0.8-1.2 parts of V2O5, 0.9-1.1 parts of SnO2, 0.25-0.35 part of TiO2, 0.5-1 part of Co2O3, 0.15-0.25 part of Nb2O5, 0.9-1.1 parts of MoO3, 0.2-0.4 part of Bi2O3 and 0.3-0.5 part of Ta2O5. The low-consumption soft magnet ferrite material has properties of high frequency, high initial magnetic conductivity and low consumption.

The invention discloses a preparation process of wide-temperature low-power-consumption manganese zinc ferrite powder. The preparation process includes, preparing and mixing materials, sheet rolling, pre-sintering, coarse vibrating, fine grinding, adding PVA and performing component correction, and spray drying. The wide-temperature low-power-consumption manganese zinc ferrite powder prepared by the preparation process is high in saturation flux density, low in power consumption and high in Curie temperature and resistivity in a range of 25-100 DEG C.

The invention discloses an anti-electromagnetic interference manganese zinc ferrite material and a preparation method thereof. The material comprises main components and auxiliary components, wherein the main components comprise, by mole percent, 43.5-44.5 mol% of Fe2O3, 53-56 mol% of MnO, and 2-3 mol% of ZnO, and the auxiliary components comprise CaCO3, Nb2O5, MgO, and V2O5. The material of the invention overcomes the disadvantage that common manganese zinc ferrite is less in resistivity, and can not be used as anti-EMI materials in high frequency fields; when compared with nickel zinc ferrite, the material of the invention is less in environment pollution, and low in cost, and can substitute for nickel zinc ferrite to be used as an anti-EMI materials in high frequency fields.

The invention discloses a magnetic glue which is used for a magnetic glue layer of a wire winding inductor device and contains a mixture of a magnetic substrate and an adhesion substrate; the magnetic substrate is a mixture of one or more of NiZn ferrite and MnZn ferrite and one or more of metal series FeNi, carbonyl iron powder, FeSiCr and FeSi. The invention discloses an inductor device which comprises a magnetic core and a coil winding on the magnetic core; and the magnetic glue is coated on the magnetic core, covers the coil winding and forms the magnetic glue layer which is tightly adhered to the magnetic core after being solidified. Compared with an ordinary inductance device, as for the inductor device adopting the magnetic glue, the mechanical shock resistance is stronger, magnetic flux leakage of a formed closed magnetic circuit structure can be reduced, and the electromagnetic interference resistance is strong.

The invention relates to a nickel zinc ferrite magnetic shielding inductor product and a manufacturing method thereof. A raw material for manufacturing a magnetic shielding inductor mainly comprises ferric oxide, nickel oxide, zinc oxide and copper oxide, and an auxiliary component of the raw material comprises bismuth trioxide, molybdenum trioxide or vanadium pentoxide. The manufacturing method of the magnetic shielding inductor includes that the materials the mixed, sintered and made into powder materials, the powder materials are pressed into a rodlike magnetic core and a square cap-shaped magnetic core blank, the square cap-shaped magnetic core blank is placed in an air kiln to be sintered, the rodlike magnetic core is installed in a sintered square cap-shaped magnetic core after a solenoid coil is installed on the rodlike magnetic core, and the magnetic shielding inductor is manufactured. A special inductor structure and an assembly method are adopted so as to enable the inductor to shield external electromagnetic fields, and anti-interference capacity of the conductor can be improved. Nickel zinc ferrite materials with high saturation magnetic flux density are adopted, tolerance of direct current superposition of the inductor can be improved, and requirements of the inductor for miniaturization, thinning, high frequency, high performance and the like are met.

The invention discloses soft-magnetic ferrite with high saturation magnetic induction. Raw materials of the soft-magnetic ferrite comprise first group of materials and second group of materials; the first group of materials comprise, in percent by substance amount, 52.0-53.5 mol% of ferric oxide, 38.0-42.0 mol% of manganese oxide, and 6.0-8.0 mol% of zinc oxide; by taking the total mass of the first group of materials as a reference, the second group of materials comprise 25-100 ppm of silicon oxide, 300-800 ppm of calcium oxide, 300-700 ppm of niobium oxide, 300-500 ppm of zirconium oxide, and 2500-3000 ppm of nickel oxide. The invention also discloses a preparation method of the above soft-magnetic ferrite with high saturation magnetic induction. The obtained soft-magnetic ferrite possesses high saturation magnetic induction, relatively high initial magnetic permeability and low magnetic core loss.

The invention discloses a method for preparing a high-saturation flux density soft magnetic composite material based on the acidic bluing technique. According to the method, the surface of soft magnetic alloy powder is coated with a coating layer formed by nanometer Fe3O4 uniform in size based on the acidic bluing technique, and then the novel soft magnetic composite material is obtained through bonding, compression molding and heat processing. The method has the advantages that the Fe3O4 preparing method based on the acidic bluing technique is simple, the thickness of the Fe3O4 layer is easy to control, and due to the adoption of in-situ reaction, a prepared insulating layer is dense and can be better combined with magnetic powder. Compared with a traditional soft magnetic composite material, the high-saturation flux density soft magnetic composite material has the advantage that due to the fact that the insulating layer is made from ferromagnetic Fe3O4, magnetic dilution is effectively reduced, and then the soft magnetic composite material high in saturation flux density and magnetic conductivity can be obtained.

The invention provides a ferrite composite. The ferrite composite includes a main component which has 63.3 to 65.5 mole% ferric oxide converted to Fe2O3, 11.6 to 15.8 mole % zinc oxide converted to ZnO, and the balance being manganese oxide. The ferrite composite is characterized in that relative to the main component 100 weight%, the monox content is 60 to 250ppm converted to SiO2, the calcium oxide content is 360 to 1000ppm converted to CaO, the Pb content is below 7ppm converted to element, and the Cd content is below 7ppm converted to element.