166results about How to "High saturation flux density" patented technology

The present invention provides a Mn-Zn ferrite which is low in the loss in the frequency range between a few 10 kHz and a few 100 kHz and high in the saturation magnetic flux density in the vicinity of 100°C. The present invention comprises the steps of compacting a powder having a specific surface area (based on the BET method) of 2.0-5.0 m 2 / g and a 50% particle size of 0.7-2.0 µm into a compacted body having a predetermined shape and obtaining a sintered body by sintering the compacted body. Preferably, the Mn-Zn ferrite comprises 54-57 mol-% Fe 2 O 3 , 5-10 mol-% ZnO, more than 0 to 4 mol-% NiO, and the balance substantially being MnO as main constituents.

The invention discloses a soft magnetic ferrite material and a preparation process thereof. The soft magnetic ferrite material comprises the following components: 52 to 55 mol of Fe2O3, 39 to 42 mol of Mn3O4, 5-8 mol of ZnO, 0.1 to 0.6 mol of additive 1, 0.1 to 0.2 mol of additive 2 and 0.006 to 0.06 mol of ZrO2, wherein the additive 1 is one or more of SnO2, CaCO3 and V2O5; and the additive 2 isone or more of Nb2O5, K2CO3, CaCO3, Ta2O5, SnO2 and V2O5. The soft magnetic ferrite material prepared by the process overcomes defects of the prior art and has the advantages of high frequency, high saturation magnetic flux density and low magnetic loss.

The invention discloses a soft magnetic ferrite material. Raw materials for preparing the soft magnetic ferrite material comprise composite materials and auxiliary materials. The composite materials comprise iron oxide, manganese oxide and zinc oxide. The auxiliary materials comprise 0-6000 ppm of nickel oxide, 100-800 ppm of calcium carbonate, 0-500 ppm of lithium carbonate, 20-120 ppm of silicon dioxide, 0-230 ppm of magnesium oxide, 0-180 ppm of niobium oxide, 700-2000 ppm of cobalt oxide, 0-350 ppm of bismuth oxide, 100-600 ppm of vanadium oxide, 0-2500 ppm of titanium dioxide, 0-500 ppm of copper oxide, and 100-500 ppm of zirconium oxide. The invention also discloses a preparation process of the soft magnetic ferrite material. The soft magnetic ferrite material has high initial magnetic permeability and low magnetic core loss.

A method for making a nano-scale amorphous soft magnetic powders obtained by thermally processing and crystallizing amorphous ribbons produced using a rapid solidification process (RSP) and crushing the same. The amorphous soft magnetic core having an excellent high-frequency characteristic is obtained by performing a preliminary thermal treatment of Fe-based amorphous metal ribbons produced by using RSP to then be converted into nano-scale grain metal ribbons, crushing the metal ribbons to thereby obtain nano-scale grain metal powders, classifying the nano-scale grain metal powders to then be mixed into a distribution of powder particles having an optimal uniform composition, mixing the mixed powder with a binder, and then forming a core, and annealing the formed core to then coat the core with an insulating resin.

A MnZn ferrite core is prepared from high-Si iron oxide (52.6-54 mol%), zinc oxide (8-12 mol%), manganese oxide (35.4-38 mol%) and calcium oxide (0.02-0.12 wt.%) through sintering in the oxygen partial pressure controlled nitrogen gas or vacuum atmosphere. Its advantages are low cost, low magnetic loss, high saturated magnetic flux density, and short sinter time (20 hr).

The invention provides a preparation method of magnetic powder cores. The preparation method comprises the steps: mixing carbonyl iron powder with a phosphating solution, and phosphating to obtain iron powder after treatment; drying the iron powder after treatment, sieving and then mixing and coating with an insulating coating agent to obtain powder after coating, wherein the insulating coating agent comprises organic resin, inorganic coating material, coupling agent and curing agent; and granulating, pressing and solidifying the coated powder to obtain a magnetic powder core. The preparationmethod of magnetic powder cores achieves the best performance of the magnetic powder core by selecting a specific insulating coating agent, and combines the remaining operations, thus having the magnetic properties such as higher saturation magnetic flux density and stable magnetic permeability, and having strong resistance to breakdown. The preparation method of magnetic powder cores is excellentin molding performance, can meet molding of the complex structure of one-piece inductors, and can satisfy the industrial requirement for mechanical properties. The preparation method of magnetic powder cores enables the insulating coating of the magnetic powder core to be more stable by combination of multi-element coatings, so that the prepared product has stronger working stability during the service life of the product.

The present invention relates to a soft magnetic ferrite material and preparation method, specifically to a highly saturated magnetic flux density low-loss soft magnetic ferrite material and preparation method thereof. The present invention is mainly directed to resolve low saturated magnetic flux density and large loss and the like problems existing in the prior art, the invention provides highly saturated magnetic flux density low-loss soft magnetic ferrite material which has high saturation magnetic flux density, low loss and adaptation to the prior large-scale production and preparation method thereof by the improvement of composition. The main technical program of this invention as follows: the principal components are 53.4 - 54.6mol% of Fe2O3, 2 - 9mol% of ZnO and 37.6 - 43.4mol% of MnO; the vice components are 150 - 200ppm of SiO2, 600 - 1200ppm of CaCO3, 150 - 250ppm of ZrO2, 150 - 200ppm of Nb2O3, and 100 - 200ppm of Na2O.

The invention discloses a soft-magnetic ferrite with low loss and a high saturation flux density. The raw materials comprise materials A and materials B. The materials A comprise, by mole, 56-60 parts of iron oxide, 40-45 parts of manganese oxide, 7-10 parts of zinc oxide and 2-4 parts of copper oxide. With the total weight of the materials A as a base, the materials B comprise 2500-3000ppm, 300-700ppm of calcium oxide, 100-300ppm of niobium oxide, 400-800ppm of zirconium oxide, 1500-2000ppm of nickel oxide, 300-800ppm of bismuth oxide, 300-500ppm of molybdenum oxide, 200-500ppm of silicon oxide and 2000-2500ppm of bonding agents. The invention also discloses a preparation method for the soft-magnetic ferrite with low loss and a high saturation flux density.

The invention relates to a soft magnetic composite material with high saturation magnetic flux density and high strength and a preparation method thereof, and belongs to the technical field of soft magnetic composite material preparation. The method comprises the following steps: 1, carrying out phosphating treatment on iron powder; 2, washing, filtering and drying the powder, and then obtaining coated powder through screening; 3, mixing the coated powder with calcium carbonate through mechanical ball milling; 4, premixing the coated iron powder obtained at step 3 with a lubricant; 5, heating a mold, and adding the mixture obtained at step 4 for compression molding; 6, placing a pressed magnetic ring in a vacuum sintering furnace for nitrogen atmosphere annealing heat treatment. The warm-pressing molding of the insulated coated powder is performed through the heating of the mold, thereby effectively reducing the friction force between the powder; and then the residual stress of the material is removed through annealing heat treatment, so the composite material is obtained and the use requirements under complex stress conditions are met.

The invention discloses a magnetic material for a photovoltaic inverter. The magnetic material is characterized by being a MnZn ferrite material and comprising 51.5 to 57.5 molar percent of Fe2O3, 4.5 to 15.5 molar percent of ZnO and the balance of MnO which serve as main components and 0.05 to 0.15 weight percent of Eu2O3 and 0.008 to 0.10 weight percent of Al2O3 which serve as auxiliary components, and one or more of 0 to 0.15 weight percent of CaO, 0 to 0.035 weight percent of SiO2, 0 to 0.50 weight percent of MgO, 0 to 0.06 weight percent of Nb2O5 and 0 to 0.055 weight percent of ZrO2 which also serve as auxiliary components. The magnetic material is characterized in that: the thermal expansion coefficient is less than 8*10<-6>; the magnetostrictive coefficient is less than -0.3*10<-6>; the magnetic conductivity at the temperature of 25 DEG C is 2,100+ / -25 percent; the saturation magnetic flux density at the temperature of 25 DEG C is more than 530mT and the saturation magnetic flux density at the temperature of 100 DEG C is more than 430mT; and at the temperature of 100 DEG C, under the conditions of 25KHz*200mT and 100KHz*200mT, the energy consumption is less than 65mW / cm<3>and 320mW / cm<3> respectively.

Disclosed is a soft magnetic amorphous alloy represented by the following composition formula: {Fea(SixByPz)1-a}100-bLb. In the composition formula, L represents one or more elements selected from Al, Cr, Zr, Nb, Mo, Hf, Ta and W, and a, b, x, y and z satisfy the following relations: 0.7 <= a <= 0.82, 0 < b <= 5 atom%, 0.05 <= x <= 0.6, 0.1 <= y <= 0.85, 0.05 <= z <= 0.7 and x + y + z = 1.

A soft magnetic thin film of CoFe alloy having a high Br and low Hc is prepared by furnishing a plating tank including cathode and anode compartments which are separated by a diaphragm or salt bridge so as to permit charge transfer, but inhibit penetration of Fe ions, feeding a plating solution containing Co ions and divalent Fe ions to the cathode compartment, feeding an electrolyte solution to the anode compartment, immersing a substrate in the plating solution, immersing an anode in the electrolyte solution, electroplating, and heat treating the plated film at 100–550° C.; or by immersing a substrate and a soluble anode in a plating solution containing Co ions and divalent Fe ions, electroplating, and heat treating the plated film at 100–550° C.

The invention discloses a magnetic material for a light emitting diode (LED) illumination control circuit, and is characterized in that: the magnetic material is MnZn ferrite, which comprises the following main components: 59.5 to 61.8 mol percent of Fe2O3, 9 to 12 mol percent of ZnO and the balance of MnO, and following auxiliary components (based on the total content of the main components): 0.01 to 0.15 weight percent of KCO3, 0.008 to 0.10 weight percent of Y2O3, 0.01 to 0.25 weight percent of CaO, 0.005 to 0.055 weight percent of SiO2, 0.005 to 0.50 weight percent of MgO, 0.005 to 0.06 weight percent of V2O5, 0.01 to 0.50 weight percent of CoO, 0.005 to 0.08 weight percent of Nb2O5 and 0.005 to 0.055 weight percent of ZrO2. The magnetic material is characterized in that: the magneticconductivity at the temperature of 25 DEG C is 1,500+ / -25 percent; the saturated magnetic flux density at the temperature of 100 DEG C is more than 500mT; and the power consumption at the temperatureof 100 DEG C and 100KHz*200mT is less than 620mW / cm<3>.