264results about How to "High initial permeability" patented technology

This invention relates to a new type nanometer crystal Fe-Zr-Nb-Si-Al-Cu series soft magnetic alloy super thin band and its process technology in which, the mother alloy is smelted by vacuum IF induction oven, an amorphous band is processed by a single quick cooling device to be processed by magnetic field heating at last to get the needed product with good soft magnet performance and iron core made by the super thin band improves its magnetic performance greatly.

The invention discloses a broadband wide temperature range high-power density low-loss manganese-zinc soft magnetic ferrite material. The material comprises main ingredients, an auxiliary ingredient A and an auxiliary ingredient B, wherein the main ingredients comprise the following components in percentage by weight: Fe2O3, MnO and ZnO; based on the weight of the main ingredients, the auxiliary ingredient A comprises at least three of CaCO3, Nb2O5, NiO, SnO2 and Co3O4; and the auxiliary ingredient B comprises at least three of SiO2, Y2O3, K2CO3, Al2O3, CuO, MoO and Bi2O3. The preparation method of the material sequentially comprises the following steps: primary batching, primary sanding, pre-sintering, secondary batching, secondary sanding, performing component analysis, performing spray granulation, molding and sintering. The material disclosed by the invention has low loss in a temperature range from 20 DEG C below zero to 120 DEG C under the conditions of 100-500KHz and 100-200mT, and has high magnetic conductivity and high high-temperature saturation flux density. Compared with the conventional material, the material disclosed by the invention is energy-saving and can enable a switching power module to be miniature and efficient.

The anti-interference magnesium-zinc ferrite is produced with MgO, ZnO and Fe2O3 in certain proportion as main material, and through mixing, calcining at 1000-1200 deg.c for 30-90 min, adding supplementary material, crushing, mixing, adding adhesive, spray pelletizing to obtain grains of 180 micron average size, pressing to form magnetic core, sintering at 1250-1350 deg.c for 2-5 hr and cooling. The present invention has simple production process, and the produced magnesium-zinc ferrite has high initial magnetic permeability, high resistivity, excellent magnetic curve characteristic, low cost, wide application range and good use effect.

The invention relates to a wide-temperature low-distortion mangan zinc ferrite applicable to a broadband network transformer and a preparation method thereof. The mangan zinc ferrite mainly comprises the following components: 52.0 to 53.0 mol percent of iron oxide computed by Fe2O3, 21.0 to 23.0 mol percent of zinc oxide computed by ZnO, and the balance of trimanganese tetroxide, and also comprises the following auxiliary components in percentage by weight (wt %) computed by respective standard substance CaCO3, SiO2, V2O5 and Co2O3: 0.03 to 0.04 of CaCO3, 0.005 to 0.01 of SiO2, 0.01 to 0.03 of V2O5 and 0.03 to 0.1 of Co2O3. The mangan zinc ferrite is prepared by an oxide method and sintered under the condition of bell-type furnace densification. A product has higher initial magnetic permeability mu i, low relative loss factor tan delta/mu i, and wide-temperature low-magnetic hysteresis coefficient eta B (-40 to 85 DEG C), is capable of reducing waveform distortion, reducing transmission errors and prolonging transmission distance in the process of transmitting signals, and meets the requirement of the application in outdoor severe environment.

The invention discloses a high-frequency high-power Ni-Zn base magnetic ferrite material and a manufacturing method thereof. The Ni-Zn base magnetic ferrite material comprises a main ingredient, an ionic substitute ingredient and a compound composite and doped ingredient, wherein the main ingredient comprises Fe2O3, ZnO and the balance of NiO; the ionic substitute ingredient comprises one or more kinds of Co3O4, MnCO3 and CuO containing Co3O4; and the compound composite and doped ingredient comprises 2-3 kinds of V2O5, Bi2O3, Ta2O5, ZrO2, CuO, Nb2O5 and Co3O4. The manufacturing method comprises the following steps: (a) preparing a Ni-Zn base ferrite main ingredient mixture; (b) preparing a main ingredient pre-sintered material; (c) preparing micro-fine ferrite powder; (d) preparing a raw blank of a magnetic core; and (e) sintering the magnetic core. The invention obtains the Ni-Zn base magnetic ferrite material with high electromagnetic performance, high strength, high frequency and low loss by optimizing the composite design of a formulation and adopting the manufacturing method of the high-frequency high-power Ni-Zn base magnetic ferrite material. The Ni-Zn base magnetic ferrite material is used for high-power equipment of 1-30MHz and used as the magnetic core for a transformer, an inductor, a filter, a tuner, and the like.

The invention belongs to the field of soft magnetic ferrite, particularly relates to a Mn-Zn ferrite material and provides a Mn-Zn ferrite material with a high initial magnetoconductivity in a wide temperature scope. The Mn-Zn ferrite material is prepared by main components and auxiliary components. The main components are as follows: 51-56 mol% of ferric oxide, 16-26 mol% of zinc oxide and the balance manganese oxide; the auxiliary components comprise one or a combination of more of 50-500ppm of calcium oxide, 50-1000ppm of bismuth oxide, 50-800ppm of molybdenum oxide, 50-800ppm of vanadium oxide or 50-800ppm of indium oxide based on the total weight amount of the main components. In a preferred proposal, one or a combination of more of zirconium oxide, titanium oxide, cobalt oxide or niobium oxide is further added in the auxiliary components. The Mn-Zn ferrite material of the invention is prepared according to a production process of a conventional drying method, and has the characteristic that the initial magnetoconductivity mui is above 5000 within a temperature zone of minus 60 DEG C-130 DEG C, thereby meeting the requirement of electronic devices on a magnetic core with high magnetoconductivity at a lower temperature.

The invention discloses a nickel and zinc soft magnetic ferrite material and a preparation method thereof. A high-temperature-resistant soldering tin, nickel and zinc soft magnetic ferrite material comprises the following components in parts: 45-50mol percent of Fe2O3, 26-32 mol percent of ZnO, 17-21 mol percent of NiO and 4-8 mol percent of CuO, and also comprises the following components in parts: 0.2-0.5 wt percent of auxiliary material A and 0.1-0.2 wt percent of auxiliary material B, wherein the auxiliary material A is one or two of Bi2O3, SiO2 and Ta2O5, and the auxiliary material B is one or more of TiO2, ViO5 and Nb2O5. The high-temperature-resistant soldering tin, nickel and zinc soft magnetic ferrite material has the characteristics of high frequency, high magnetic conductivity,high Bs and TC (Temperature Curie).

The invention discloses a soft magnetic ferrite material containing magnesium element, nickel element and zinc element, which comprises the following compositions in mol portion: 60 to 66 mol percent of ferric oxide Fe2O3, 7 to 10 mol percent of nickel oxide NiO, 7 to 10 mol percent of magnesia MgO, 10 to 15 mol percent of zinc oxide ZnO and 3 to 6 mol percent of copper oxide CuO. The manufacturing method comprises the following steps of the processing of raw material, batching, primary ball milling, drying, pulverization or sifting, preburning, secondary batching, secondary ball milling, secondary drying and secondary pulverization or sifting, in a preburning condition, the soft magnetic ferrite material is presynthesized in an air furnace at a temperature of between 800 and 900 DEG C. The prepared soft magnetic ferrite material has the initial magnetic conductivity of about 100, stable magnetic performance and low production cost when the soft magnetic ferrite material is used to produce a laminated sheet type inductor.

The invention discloses an MnZn ferrite magnetic material with high initial permeability and low loss and a preparation method thereof, the MnZn ferrite is prepared by principal components and auxiliary components, and the principal components and the mass percentage by oxide are as follows: 60-73wt% of Fe2O3, 13-33wt% of ZnO and balance Mn3O4; the auxiliary components are five oxides: 0.01-0.04wt% of SnO2, 0.01-0.04wt% of TiO2, 0.03-0.05wt% of Er2O3, 0.05-0.08wt% of Bi2O3 and 0.03-0.08wt% of PbO; and the soft magnetic ferrite material has not only high initial permeability but also low loss, and has excellent comprehensive soft magnetic properties.

The invention provides a magnesium-zinc soft magnetic ferrite. The magnesium-zinc soft magnetic ferrite comprises main ingredients and accessory ingredients, wherein the main ingredients comprise the following components in percentage by weight: 68.92 to 70.59 percent of ferric oxide, 16.03 to 18.52 percent of zinc oxide, 8.07 to 9.83 percent of magnesium oxide and 3.62 to 3.86 percent of copper oxide; and the accessory ingredients comprise the following components in percentage by weight: 0.1 to 0.3 percent of bismuth trioxide and 0.1 to 0.3 percent of vanadium pentoxide. The invention also relates to a method for preparing the magnesium-zinc soft magnetic ferrite. The performance of the material is close to that of a nickel-zinc soft magnetic ferrite, the loss of the magnesium-zinc soft magnetic ferrite is low when the magnesium-zinc soft magnetic ferrite is used at high frequency, and the cost is relatively lower.

The invention relates to a method for manufacturing a chip inductance element from a low-temperature cofired ferrite raw material belt. The method comprises the following steps of: 1, preparing the low-temperature cofired ferrite raw material belt; and 2, preparing the chip inductance element: positioning and drilling on the ferrite raw material belt according to the structure of a chip inductor; filling a through hole with a silver paste by adopting a screen printing method; printing a silver paste conductor pattern on the raw material belt, and printing a layer of low-temperature glass protective coating on the surface of the silver paste pattern; placing the printed raw material belt into a closely-laminated die in turn according to pre-designed layer number and order, and isopressing to form a complete multilayer base plate blank; dividing the multilayer base plate blank into small specific blocks, placing the small specific blocks into a furnace, raising the temperature to 450 DEG C, keeping the temperature for 3 hours, discharging rubber, raising the temperature from 450 DEG C to 900 DEG C, maintaining the temperature for 3 hours, and sintering; controlling the temperature for 10 hours during cooling until the temperature is 250 DEG C, and then naturally cooling along with the furnace; and manufacturing an electrode by brushing silver and capping the end of the sintered electronic element to obtain the chip inductance element.

The invention discloses a mixed soft magnetic material and an integrally molded inductor prepared thereby. According to the technical scheme, two or more kinds of large, medium and small soft magneticpowder are used; the density of the soft magnetic powder filled per unit volume is maximized through grain size distribution of the mixed soft magnetic powder required for preparation; the soft magnetic powder used for mixing are in various large, medium and small particle size distributions in the shape of a sphere, a spheroid, a polygon or a plate; and the integrally molded power inductor madeof the soft magnetic material prepared with the high-density mixed powder has the advantages of higher initial permeability, better saturation characteristics, lower product loss and higher efficiency.

The invention provides an inductor which generates fewer cracks, has high initial magnetic permeability and is unlikely to cause short circuit failure, and a method for easily manufacturing the inductor with low cost. The magnetic powder density of the inner peripheral portion (4a) and the outer peripheral portion (4b) of a wiring portion (6) in a core portion (4) is different, and the magnetic powder density of the core portion (4) in the inner peripheral portion (4a) of the wiring portion (6) is higher than that of the core portion (4) in the outer peripheral portion (4b) of the wiring portion (6).

This invention discloses a filter for correcting supply waveforms including a parallel non-linear resistor and a first capacitor, a first inductor and a second inductor with coils of the same turns winded on a same magnetic core reversely, a second capacitor and a third and fourth capacitors in series, in which, the two input ends of the two inductors are connected to both ends of the first capacitor, the second capacitor is bridged between the outputs of the first two inductors, the serial ends of the third and the fourth capacitors are bridged between the outputs of the first two inductors to be parallel to the second capacitor, the connecting point of the third and fourth capacitors is connected to the earth, the filter also includes a first resistor connected between the output of the first inductor and the input of the second inductor and said core is a nano-grain alloy ring one.

The invention relates to the technical field of magnetic materials, and discloses a method for preparing a rare-earth-doped manganese-zinc ferrite material, comprising the steps of adding manganese oxide, zinc oxide and iron oxide as main components to a ball mill and conducting ball milling to obtain a mixture A; pre-firing the mixture A, and then conducting cooling to room temperature to obtaina pre-fired material; adding the pre-sintered material, vanadium oxide, niobium oxide, bismuth trioxide, molybdenum oxide, phosphorus pentoxide, copper oxide and a composite rare earth additive into aball mill, and conducting secondary ball milling and drying to obtain a mixture B, wherein the composite rare earth additive is composed of cerium oxide, yttrium oxide and lanthanum oxide; adding a polyvinyl alcohol solution to the mixture B, conducting mixing and granulation, and then conducting sieving by a sieve of 40-80 mesh, so as to obtain pellets; adding the pellets into a molding machinefor pressing, so as to obtain a blank; and sintering the blank and conducting cooling. The rare-earth-doped manganese-zinc ferrite material prepared by the method of the invention has high initial magnetic conductivity and saturation magnetic flux density.

The invention provides a high-temperature high-Bs low-loss MnZn ferrite material which comprises main components and auxiliary components, wherein the main components comprise 53mol%-56mol% of ferrite, 34mol%-42mol% of manganese oxide and 4mol%-10mol% of zinc oxide, wherein the content of manganese oxide is accounted by Mn; the auxiliary components are selected from at least four out of CaCO3, SiO2, Nb2O5, V2O5, CoO, NiO, Ni2O3 and Li2CO3, and based on the total weight of the main components, the weight percentage of the auxiliary components is as follows: 0.02-0.08wt% of CaCO3, 0.002-0.01wt% of SiO2, 0.02-0.06 wt% of Nb2O5, 0.01-0.05wt% of V2O5, 0.03-0.20wt% of CoO, 0.03-0.20wt% of NiO, 0.03-0.14wt% of Ni2O3, and 0.01-0.10wt% of Li2CO3. The invention also provides a preparation method of the high-temperature high-Bs low-loss MnZn ferrite material.

The invention relates to a nano-crystal Mn-Zn ferrite magnetic material with high initial permeability and high thermal-magnetic sensitivity and a preparation method of the nano-crystal Mn-Zn ferrite magnetic material. When the Mn-Zn ferrite material is prepared, a raw material is composed of a main reactant and a precipitator, wherein the main reactant comprises the following components in percentage by weight: 68-72% of FeSO4, 8-15% of ZbSO4 and the balance of MnSO4; and the precipitator is hydrazine oxalate (H2C2O4N2H4.H2O). By using the preparation method, the initial permeability of the prepared Mn-Zn ferrite is up to 7500 at 25 DEG C, and the thermal-magnetic sensitivity of the prepared Mn-Zn ferrite is about 1 DEG C. the Mn-Zn ferrite prepared by the method can be widely applied to temperature detection and control systems such as household appliances, industrial machinery and the like.

The invention provides a MnZn ferrite magnetic isolation shim as well as a preparation method and application thereof. The MnZn ferrite magnetic isolation shim is mainly prepared from main componentsand auxiliary components, wherein the main components are prepared from MnO, Fe2O3 and ZnO; the auxiliary components are prepared from calcium element, zirconium element, niobium element, silicon element, vanadium element, cobalt element and gadolinium element. The preparation method comprises the following steps: (1) dosing and breaking; (2) presintering; (3) secondary breaking and slurrying; (4)tape casting moulding; (5) sintering. According to the MnZn ferrite magnetic isolation shim provided by the invention, by reasonably matching the main components and the auxiliary components, the prepared magnetic isolation shim has high saturation induction density and high magnetic conductivity; the preparation method provided by the invention is simple and efficient and suitable for factory mass production and improves the tape-casting preparation efficiency of raw shims.

The invention discloses a wideband rotating magnetic characteristic measuring system and method based on a flexible excitation coil. The measuring system comprises a detection device, a digital signal processing unit, a power amplifier, and a differential amplification circuit. The digital signal processing unit is connected with the power amplifier and the differential amplification circuit. The detection device is connected with the power amplifier and the differential amplification circuit. The detection device comprises a three-stage frustum-shaped excitation winding, a sample holder, a horizontal structure magnetic ring, a center pillar, a buckle, a corner pillar and a base. The excitation winding of the measuring system is designed as a multi-stage frustum-shaped structure to realize a wideband magnetic characteristic test. The measuring method comprises first giving an excitation signal with a low frequency, gradually increasing the frequency of the excitation signal until the sample is saturated; replacing the excitation winding connection mode after the sample is completely measured in the excitation winding connection method, and repeating the measurement process until the highest detection band.