488 results about "Manganese-zinc ferrite" patented technology

The invention discloses a high magnetic conductivity and low loss factor manganese-zinc ferrite material and a manufacture process thereof. The high magnetic conductivity and low loss factor manganese-zinc ferrite material mainly comprises the main components in percent by mole (calculated by oxide) of 51-56 mol percent of Fe2O3, 22-29 percent of MnO and 20-25 mol percent of ZnO and the auxiliarymaterials including P2O5, CaO, SiO2, Bi2O3 and the like. The manganese-zinc ferrite material with high magnetic conductivity, low magnetic conductivity temperature factor and low relevant loss factoris prepared by the steps of mixing, pre-roasting, sanding, pelleting, forming and sintering. The invention has the advantages of simple and proper formulation and advanced and reasonable manufacture process. The prepared manganese-zinc ferrite material has property exceeding CL11F-brand property and superior to the H5C2-brand material property of a TDK company in Japan.

The invention relates to a composite magnetic powder core and a preparation method of the composite magnetic powder core. According to the technical scheme, nanometer ferrite particles with even size are prepared on the surface of soft magnetic alloy powder through a hydrothermal method in a root-positioning mode, and a novel ferrite composite magnetic powder core is prepared through the pressing and thermal processing technology. The composite magnetic powder core and the manufacturing method of the composite magnetic powder core have the advantages that due to the fact that manganese zinc ferrite and nickel zinc ferrite are prepared through a hydrothermal method and a root position method, nanometer particles with controllable and even size can be prepared conveniently; the ferrite can be used as an insulated coating agent of the soft magnetic alloy powder, the defect that magnetic performance of a substrate is reduced when traditional nonmagnetic substances are used as the coating agent are overcome, and high magnetic conductivity and saturation magnetization strength can be obtained.

The invention discloses a preparation method of a manganese zinc ferrite/bismuth oxide magnetic photocatalyst, and belongs to the field of inorganic catalytic materials. The preparation method comprises the following steps of firstly, preparing a bismuth oxide precursor, then preparing a precursor of the manganese zinc ferrite/bismuth oxide composite magnetic photocatalyst, and finally, filtering, washing, drying and roasting to obtain the manganese zinc ferrite/bismuth oxide magnetic photocatalyst. According to the method, the preparation technology is simple; the used equipment is few; the preparation cycle is short; the production cost is low. The prepared magnetic composite photocatalyst is high in photocatalytic activity; the degradation rate of a 10mg/L rhodamine B solution for 2.5 hours reaches 99.1% under simulated sunlight, and the recovery rate reaches 89.3%; the manganese zinc ferrite/bismuth oxide composite magnetic photocatalyst which is recycled for three times has the degradation rate of 85% to rhodamine B within 2.5 hours. The manganese zinc ferrite/bismuth oxide magnetic photocatalyst prepared by the invention can be widely applied to the field of photo-catalyzed degradation of organic pollutants.

The anti electromagnetic interference material is composed of several layers: the impedance matching layer is made of absorbing type sendust powder, manganese-zinc ferrite and resin; the absorbing layer is made of absorbing type sendust powder, nickel zinc ferrite and resin; the reflecting layer is made of reflection type sendust powder, iron powder and resin.

The invention discloses a high-frequency wide-temperature low-loss manganese-zinc ferrite which is composed of a main ingredient and a micro ingredient, wherein the main ingredient is composed of 52-55 mol% of Fe2O3, 38-43 mol% of Mn3O4 and 5-9 mol% of ZnO; the micro ingredient is divided into a micro ingredient A and a micro ingredient B; the micro ingredient A is at least one of TiO2, Ni2O3, Co3O4 and SnO2, and the total mass content of the micro ingredient A in the high-frequency wide-temperature low-loss manganese-zinc ferrite is 1000-5000 ppm; and the micro ingredient B is composed of at least two of Nb2O5, ZrO2, CaCO3, Ta2O5, SiO2 and V2O5. Compared with the existing 3F4, the material disclosed by the invention has lower power loss and is more energy-saving under the conditions of 1000-3000 KHz and -30-120 DEG C.

This invention provides a wide-frequency low-loss manganese-zinc ferrite material with high magnetic conductivity. The major components comprise: MnO 21.5-26.5 mol. %, ZnO 20.5-25.5 mol. %, and Fe2O3 as balance. The auxiliary components comprise: one or two of Na2O (measured by Na2CO3) 0.01-0.05 wt.%, and K2O (measured by K2CO3) 0.01-0.04 wt.%, Bi2O3 0-0.04 wt.%, MoO3 0-0.04 wt.%, and V2O5 0-0.05 wt.%. This invention also provides a method for preparing the wide-frequency low-loss manganese-zinc ferrite material.

Major converted components of soft-magnetic manganese-zinc ferrite in low wastage are as follows: 52.7-53.6 mol% Fe2O3, 8.5-11.8 mol% ZnO and MnO as the rest. At least one of following component: 1000-8000ppm SnO2, 500-2000ppm CaCO3, 300-1500ppm V2O5 is added into the major components. After major components and additive are mixed and preburning, second adulteration is carried out in pulverizing operation. Admixing additive includes at least two kinds of materials from Nb2O5, K2O, CaCO3, Ta2O5, SnO2, and V2O5. Total add on is between 800-1200ppm. Features of the disclosed ferrite are higher operation frequency, low loss, and higher saturation flux density.

The present invention discloses a manganese zinc ferrite material for resisting EMI and a preparation method thereof The specific operation steps are as follows: (1) mixing: weighing the main ingredients in accordance with the corresponding percentage, mixing by ball milling, and spray-drying a slurry to obtain a powder; (2) pre-calcining: pre-calcining the powder in a box electric resistance furnace; (3) weighing of accessories: weighing accessories in accordance with the percentage of the accessories in the total weight of the pre-calcined materials; (4) a secondary ball milling: subjecting the pre-calcined material supplemented with the accessories to a secondary ball milling; (5) granulation: conducting spray granulation on the slurry after the secondary milling; (6) molding: subjecting the powder after spray granulation to press-molding; and (7) sintering: conducting sintering treatment in sintering equipment of a bell-type furnace with strictly controlled atmosphere. The invention has the beneficial effects that the prepared manganese zinc ferrite material has high impedance characteristic, high magnetic permeability, high Curie temperature Tc, high saturation magnetic induction intensity Bs, and excellent integrated magnetic properties and can be well applied to the anti-EMI components.

The invention relates to an alcohol-thermal method for preparing a carbon nano tube (MWCNTs)/ manganese-zinc ferrite (Mn1-xZnxFe2O4) magnetic nano-material. The method is mainly characterized in that the carbon nano tube, soluble malysite, zinc salt and manganese salt are taken as initial raw materials, and acid with strong oxidizing property is firstly used for acidizing the surface of the MWCNTs,; the acidized MWCNTs is dispersed into glycol solution, and then the malysite, the zinc salt, the manganese salt, anhydrous sodium acetate and dispersant polyethylene glycol are added in; and the lcohol-thermal method is adopted for preparing the (MWCNTs)/ Mn1-xZnxFe2O4 magnetic nano composite material. The prepared (MWCNTs)/ Mn1-xZnxFe2O4 magnetic nano composite material has pure crystalling phase, good dispersivity, high magnetization, strong magnetic induction sensitivity and simple preparing technique, and is not easy to agglomerate, thus being simple in the requirements for the production equipment and easy for commercial process.

The invention discloses a manganese zinc ferrite with characteristics of high temperature, low power consumption and high overlaying, and a preparation method of the manganese zinc ferrite. The manganese zinc ferrite comprises ferric oxide, manganese oxide, zinc oxide, calcium carbonate, titanium oxide, cobaltous oxide, silicon oxide, chromic oxide, niobium oxide and vanadium oxide. The manganese zinc ferrite is prepared through the steps of material blending, preburning and crashing, sanding, preparation of granulation slurry, spray granulation, manufacturing of blanks, sintering and the like, and under the test condition of 100KHz 200mT, the power loss at the temperature of 100 DEG C is smaller than 260kw/m<3>, and the Bs at the temperature of 100 DEG C is larger than 420mT; a filter, a switch power source and a transformer application electronic product are partially made of magnetic materials, partial energy is consumed, and an electronic device which is wider in use field, smaller in size, more efficient and saving in energy can be provided for users, the use frequency of the materials is expanded, the loss is reduced, performance of components with magnetic cores applied can be improved largely, electronic products are made to be smaller and more efficient, and effective help is provided for adjustment of the national industrial structure, energy conservation and emission reduction.

The invention relates to a manganese zinc ferrite material for an eddy current type approach switch, a film-coated magnetic core and a preparing method of the manganese zinc ferrite material. The principal component of the manganese zinc ferrite material contains: 51.5-53 mol% of Fe2O3, 24.0-25.0 mol% of Mn3O4 and 20.50-22.5 mol% of ZnO; and the accessory component of the manganese zinc ferrite material contains:0.50-1.00 wt% of nanometer TiO2, 0.30-0.50 wt% of nanometer SiO2, 1.00-1.50 wt% of nanometer CaO, 0.05-0.35 wt% of nanometer Co2O3 and 0.05-0.10 wt% of nanometer SnO2. The manganese zinc ferrite material is made in the oxide method, formed in mold pressing mode, sintered and grinded and then subjected to film coating on the outer surface of the magnetic core, a transition layer is made of chrome, and a target layer is made of palladium. Resistivity of the manganese zinc ferrite material in 1 MHz is that rho>=10 ohmm, relative temperature thermal index of the manganese zinc ferrite material in the temperature range of -55 DEG C to 25 DEG C is that alpha muir<=(0.3-1.2)*10-6/ DEG C, and relative temperature thermal index of the manganese zinc ferrite material in the temperature range of 25 DEG C to 100 DEG C is that alpha muir<=(0.4-1.6)*10-6/ DEG C. The magnetic core with the film-coated outer surface has excellent electromagnetic shielding performance, and meets requirements of the eddy current type approach switch for the ferrite material of being high in resistivity, small in specific temperature coefficient and strong in anti-jamming capability.

The invention discloses a suspended filler for quick biofilm culturing of microorganisms. The suspended filler is prepared from, by weight, 65-75 parts of high-density polyethylene, 5-15 parts of slaked lime, 5-20 parts of Dow powdered activated carbon, 6-10 parts of light calcium carbonate, 3-5 parts of maleic anhydride, 0.2-0.6 part of dicumyl peroxide, 1.5-3 parts of gelatin, 1-2 parts of chitin, 0.8-2 parts of ferroferric oxide magnetic powder and 0.1-0.3 part of manganese zinc ferrite. The density of the suspended filler for quick biofilm culturing of microorganisms is 0.96-0.98 g/cm3. The biofilm culturing speed is high, disengagement does not occur easily, treatment efficiency is high, and the suspended filler is suitable for treating low-concentration organic matter and ammonia nitrogen in sewage and low-concentration organic waste water. The suspended filler has extremely high hydrophilia and biocompatibility, the filler has high adsorption strength on biological films, biofilm culturing time is remarkably shortened, and the COD and ammonia nitrogen removal rate is increased remarkably.