1253 results about "Ferrite (magnet)" patented technology

A sintered ferrite magnet having a basic composition represented by the general formula: A_1−x−y+aCa_x+bR_y+cFe_2n−zCo_z+dO₁₉ (atomic ratio), wherein a, b, c and d represent the amounts of an A element, Ca, an R element and Co added in the pulverization step of an oxide magnet material, which are numerals meeting the conditions of 0.03≦x≦0.4, 0.1≦y≦0.6, 0≦z≦0.4, 4≦n≦10, x+y≦1, 0.03≦x+b≦0.4, 0.1≦y+c≦0.6, 0.1≦z+d≦0.4, 0.50≦[(1−x−y+a)/(1−y+a+b)]≦0.97, 1.1≦(y+c)/(z+d)≦1.8, 1.0≦(y+c)/x≦20, and 0.1≦x/(z+d)≦1.2.

The invention relates to a super low-loss and small-line width microwave ferrite material and a preparation method for the microwave ferrite material and belongs to the field of microwave communication and magnetic materials. The main phase of the material is of a johnstonotite structure, and the chemical formula of the material is Y3-2x-yCa2x+yFe5-x-y-zVxZryAlzO12, wherein x is not less than 0.02 but is not more than 0.25, y is not less than 0.05 but is not more than 0.25, and z is not less than 0.01 but is not more than 0.25. The preparation method comprises the following steps of: calculating according to chemometry and weighing a raw material, vibratory milling, presintering, vibratory grinding and coarse crushing, sanding fine crushing, spray granulation, compression moulding and sintering. Proved by testing, the ferromagnetic resonance line width deltaH of the obtained material is not more than 1.27KA/m, the dielectric loss tgdeltae is not more than 0.5*10-4, and the insertion loss of an assembled microwave device is not more than 0.21dB, and thereby, the stability and the reliability of the obtained material are greatly enhanced, and the application range is broadened. The manufactured microwave ferrite device has the advantages of wide working band and low insertion loss.

The invention relates to a highly efficient soft magnetic material and the preparing method thereof. The soft magnetic material is composed of metal soft magnetic material and soft magnetic ferrite, the metal soft magnetic material is composed of at least one selected from Fe-Ni-Me system (Me is one or more than two selected form Cu, Cr, Nb, V, W, Si, Pd, Zn, Al, Ti and Mn), Fe-Co system, Fe-Co-V system, Fe-Al system and Fe-Al-Me system (Me is one or more than two selected form Co, Cr and Mo), the soft magnetic ferrite is composed of at least one selected form Mn-Zn system, Ni-Zn system, Li-Zn system, Cu-Zn system and Mg-Zn system soft magnetic ferrites. The preparing method of the soft magnetic material comprises the steps of: cold pressing, and sintering, hot pressing or spark plasma sintering. The soft magnetic material does not have the drawbacks of low resistivity of the metal soft magnetic and low magnetic strength of the ferrite, as well as keeps the superior properties of the metal soft magnetic and low magnetic strength of the ferrite.

The invention discloses a MnZn soft magnetic ferrite material with high frequency, low temperature coefficient and low loss and a preparation method thereof. The material employs 68 wt%-72 wt% of Fe2O3, 5 wt%-9 wt% of ZnO, and the balance MnO as main components, and is prepared by steps of first ball milling, first sintering, second material preparing, second ball milling, granulation, compaction molding, second sintering and the like. The innovativeness of the invention is that by appropriate component proportions, ion composite doping and substituting and material preparation technology, a domain-wall-free structure is formed, domain wall resonance is inhibited, and the obtained MnZn power magnetic ferrite can work at a frequency highest to 5 MHz, and the material has relatively high temperature stability and relatively low power loss.

The invention belongs to the permanent-magnet material field and provides a method for preparing permanent magnet oxysome material, which mainly comprises a novel technique adopted in wet ball-milling stage, that is, being receiving wet ball-milling to reach a certain granularity, a pre-sintering material firstly receives low-temperature resintering, and then receives wet remilling for a short time, so as to prepare needed slurry for facilitating sintering after forming. Through adopting the method provided by the invention, the sample coercitive force is effectively upgraded to obtain excellent comprehensive magnetic property on the basis that magnetic remanence is not reduced.

The invention belongs to the technical field of electronic components and relates to a multi-layer chip filter and a preparation method thereof. The filter leads in ceramics and ferrite in the same chip and simultaneously realizes large inductance and large capacitance; wherein, the inductance consists of a hollow inductance (a 'magnetic core' is a ceramic material) and a magnetic core induction (the magnetic chip is ferrite material). The hollow inductance is characterized by small inductance value, large quality factor, high self-resonance frequency, and the like, thus being capable of better broadening the working frequency section of the filter; the magnetic core inductance has the characteristics of large inductance value, low self-resonance frequency, and the like, thus better reducing the in-band insertion loss of a filter with a low cut-off frequency and improving the effect of the transmission signal of the filter. The preparation method of the multi-layer chip filter includes the steps such as material preparing, casting, punching, pore filling, conductor printing, chip overlapping, isostatic pressing, gumming, sintering, etc. The filter has the advantages of small size, large rectangle degree, large out-band rejection as well as broad working frequency. The preparation method has high controllability and can be compatible with the technique of the existing chip components.

The invention relates to an antenna component used for microwave ablation. The antenna component used for the microwave ablation comprises a cooling water channel, a coaxial line and a radiator, wherein a circle of soft magnetic ferrite film is plated on the outermost layer of the coaxial line. The invention also relates to a microwave ablation needle adopting the antenna component used for the microwave ablation. The antenna component used for the microwave ablation has the advantages that the soft magnetic ferrite film can effectively inhibit microwave transmitted backward along the outer wall of the coaxial line, a radiation zone does not need to be filled with a stable medium, circulating water is allowed to enter the radiation zone, temperature at the head of the ablation needle can be effectively controlled, and the ablation needle is prevented from being burned out due to overhigh temperature and a medical accident is avoided.

The invention relates to the field of permanent magnetic ferrites, particularly a production method of a permanent magnetic ferrite, which comprises the following steps: after secondarily proportioning permanent magnetic ferrite primary presintering powder and permanent magnetic ferrite reclaimed material, adding secondary additives, preparing a pulp, forming and sintering to obtain the permanent magnetic ferrite material. The invention solves the technical problems of low utilization value of permanent magnetic ferrite reclaimed material and incapability of producing high-performance permanent magnetic ferrite from the permanent magnetic ferrite reclaimed material, implements cyclic utilization of the permanent magnetic ferrite reclaimed material, changes wastes into valuable substances, enhances the utilization ratio of the raw materials, lowers the production cost of the material, and increases the cost performance of the material. The permanent magnetic ferrite magnetic body has the following properties: the residual flux density Br is greater than or equal to 4400Gs, the coercive force Hcb is greater than or equal to 3250Oe, the intrinsic coercive force Hcj is greater than or equal to 3500Oe, and the maximum magnetic energy product (BH)max is greater than or equal to 4.3MGOe.

A composite ferrite composition comprises a magnetic material and a non-magnetic material. A mixing ratio of said magnetic material and said non-magnetic material is 20 wt %:80 wt % to 80 wt %:20 wt %. Ni—Cu—Zn based ferrite is used as the magnetic material. Oxides of Zn, Cu, and Si are at least included in a main component of said non-magnetic material. Borosilicate glass is included in a subcomponent of said non-magnetic material.

The invention relates to a MnZn ferrite material and a method thereof for manufacturing a magnetic core out of the material. According to mol rate, the ingredients of principal crystalline phase include 48.5-53.8 percent of Fe2O3, 35.6-40.8 percent of MnO and the rest of ZnO. By weight, the principal crystalline phase needs to be further added with 100-600ppm of a first accessory constituent, 50-3000ppm of a second accessory constituent and 100-6000ppm of a third accessory constituent. The first accessory constituent means one or the two of SiO2 and Ta2O5, the second accessory constituent means one or more of CaCO3, Bi2O3, Nb2O5 and WO3 and the third accessory constituent means one or more of TiO2, V2O5 and Co3O4. Within the wide temperature range from 25 to 100 DEG C, the MnZn ferrite material has surely low power loss of 100kHz and 200mT and the power loss of Pcv of not more than 380KW/m<3>. The magnetic core prepared by adopting the materials of the invention greatly reduces the power loss of 'secondary power supply' in the state of standby, idle load or light load, thus achieving the aim of saving energy.

The invention relates to a high-performance permanent magnet ferrite material and a preparing method thereof and belongs to the technical field of magnetic function material preparation. The invention adopts the technical scheme as follows: carrying out preparation according to a main phase molecular formula Sr1-xBaxO.nFe(12-y)/nRy/nO3, wherein x is not smaller than 0 and not bigger than 0.998, n is not smaller than 5.75 and not bigger than 6.15, y is bigger than 0 and not bigger than 0.6, R refers to Cr or Cr and Al, and the content of Cr and Al is smaller than or equal to 0.6 when R refers to Cr and Al; secondarily adding one or more than two of industrial-purity CeO2, Ga2O3 and MoO3. The rest magnetism Br value of the high-performance permanent magnet ferrite prepared by the method is larger than or equal to 390mT, the intrinsic coercivity Hcj value is larger than or equal to 346.1kA/m, and the magnetic energy product (BH)max value is larger than or equal to 28.7kJ/m<3>. The method has the advantages that the high-performance permanent magnet ferrite material with a high performance-to-cost ratio is prepared through the relatively cheap chromium or chromium and aluminum substituted combination additive without adding expensive rare earth and rare metal oxide.

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.

A porous ferrite core material for an electrophotographic developer, the porous ferrite core material including Mg in a content of 0.3 to 3% by weight, Ti in a content of 0.4 to 3% by weight and Fe in a content of 60 to 70% by weight, and the porous ferrite core material having a pore volume of 0.04 to 0.16 ml/g, a peak pore size of 0.4 to 1.6 μm, a saturation magnetization of 40 to 80 Am²/kg, a remanent magnetization of less than 7 Am²/kg and a coercive force of less than 43 A/m; a resin-filled ferrite carrier for an electrophotographic developer obtained by filling a resin in the voids of the porous ferrite core material; and an electrophotographic developer using the ferrite carrier.

The invention relates to a Mn-Zn ferrite magnetic material and a preparation method thereof. The main component and content of the Mn-Zn ferrite magnetic material are calculated as oxides: 52-56 mol% of Fe2O3; 2-10 mol of ZnO %; MnO is 38-42mol%; auxiliary components are: CaO: 400-800ppm, Nb2O5: 100-400ppm, ZrO2: 100-800ppm, Co2O3: 1000-5000ppm or a combination, it is a kind of high saturated Mn-Zn ferrite magnetic material with magnetic induction, low power consumption and excellent electromagnetic characteristics under ultra-high temperature conditions.

The invention discloses a method for directly preparing ferro-magnetic microcrystal glass by thermal state steel slag, comprising the steps of founding base glass by steel slag and preparing ferro-magnetic microcrystal glass by thermal treatment. The method comprises the following steps of: firstly, milling and evenly mixing auxiliary material components, heating the mixture for 2-4h at the temperature of 1400-1450DEG C, melting into liquid, pouring thermal state steel slag into an auxiliary material melt and evenly mixing, casting in a mold to be formed, annealing, and cooling to room temperature, so that a base glass blank can be formed; and carrying out the nucleating and crystallizing thermal treatment on the glass blank, preserving heat preservation after the crystallization temperature is higher than 950DEG C and then cooling down, so that the magnetic microcrystal glass where the diopside and the ferrite are taken as a main crystalline phase can be obtained. Due to a preparation method of the ferro-magnetic microcrystal glass provided by the invention, a mass of sensible heat in the thermal state steel slag can be sufficiently used, the environment pollution can be avoided, and the iron in the slag can be effectively used. The prepared microcrystal glass is good in magnetic thermal property and biological activity, and is high in product additional value.

A sintered ferrite magnet comprising (a) a ferrite phase having a hexagonal M-type magnetoplumbite structure comprising Ca, an element R which is at least one of rare earth elements and indispensably includes La, an element A which is Ba and/or Sr, Fe, and Co as indispensable elements, the composition of metal elements of Ca, R, A, Fe and Co being represented by the general formula of Ca_1-x-yR_xA_yFe_2n-zCo_z, wherein the atomic ratios (1-x-y), x, y and z of these elements and the molar ratio n meet the relations of 0.3≦(1-x-y)≦0.65, 0.2≦x≦0.65, 0≦y≦0.2, 0.03≦z≦0.65, and 4≦n≦7, and (b) a grain boundary phase indispensably containing Si, the amount of Si being more than 1% by mass and 1.8% or less by mass (calculated as SiO₂) based on the entire sintered ferrite magnet, and its production method.

A soft-magnetic Mg-Zn ferrite is proportionally prepared from Fe2O3, MgO, ZnO, Mn3O4, flux and auxiliary through mixing and sintering at lower temp (1220 deg.C). Its advantages are high strength and properties, and high percentage of finished products.

The invention discloses a high magnetic-energy-product M type calcium series permanent magnetic ferrite material and a preparation method thereof. The high magnetic-energy-product M type calcium series permanent magnetic ferrite material is a hexagonal crystal system, and the chemical structural formula is R1-x-yCaxLayO.nFe(12-z)/nCoz/nO3, wherein x is greater than or equal to 0.001 and smaller than or equal to 0.4, y is greater than or equal to 0.001 and smaller than or equal to 0.5, z is greater than or equal to 0.01 and smaller than or equal to 2.0, 1-x-y is greater than 0.2 and smaller than or equal to 0.998, n is greater than or equal to 5.0 and smaller than or equal to 6.5. R is Sr or adopts Sr as the main component, and also contains one, two or three of Ba, lanthanide series Ce, Pr, La, Nd and Sm. When R is Sr and Ba, the content of Sr and Ba is less than or equal to 0.998. In addition to high residual magnetism and intrinsic coercivity, the high magnetic-energy-product M type calcium series permanent magnetic ferrite material provided by the invention also has higher magnetic induction coercivity and maximum magnetic energy product, and is particularly in favor of miniaturization of permanent magnetic ferrite devices.

The invention relates to a rare earth permanent magnet prepared from a bayan obo accompany raw ore misch metal and a preparation method of the rare earth permanent magnet. The rare earth permanent magnet is prepared from the components as shown in the following equation: (PrNd)x(MM)y(Fe(1-a)Aa)zB, wherein x+y is greater than or equal to 2 and is less than or equal to 2.5, z is greater than or equal to 11 and less than or equal to 14, and MM is bayan obo accompany raw ore misch metal. The rare earth permanent magnet can be prepared by using a powder metallurgy process and a rapid-quenching hot-press thermal deformation process. The bayan obo accompany raw ore misch metal is adopted to develop a novel resource-saving rare earth permanent magnet for replacing a conventional rare earth permanent magnet, the rare earth permanent magnet provided by the invention has the advantages of low price and environment pollution reduction, the magnetic energy product of the prepared rare earth permanent magnet ranges from 25-45 MGOe, and the blank of the application range of ferrite and SmCo rare earth permanent magnets can be well made up.