165 results about "Zinc ferrite" patented technology

This invention relates to a method for the combined leaching of high-silicon zinc roasted ore and high-sulfur zinc oxide powder, belonging to the field of hydrometallurgical technology. The high-sulfur zinc oxide powder is leached neutrally to obtain zinc oxide leaching residue and zinc powder leaching solution. The zinc powder leaching solution is then mixed with high-silicon zinc roasted ore slurry for controlled silica leaching of the high-silicon zinc roasted ore to obtain zinc ore leaching residue and zinc ore leaching solution. The zinc powder leaching residue and zinc ore leaching residue are mixed and then subjected to low-acid leaching to obtain low-leaching residue and low-leaching solution. The low-leaching residue is then subjected to hot acid leaching to obtain hot-leaching residue and hot-leaching solution. The hot-acid residue is then subjected to high-acid leaching to obtain lead-silver slag product and high-leaching solution. The hot-leaching solution is neutralized and reduced by high-sulfur zinc oxide powder to obtain neutralized solution and neutralized residue. The neutralized solution is then subjected to mineralization and iron precipitation to obtain hematite product and iron-removed solution. This invention can effectively control the leaching of silicon in the high-silicon zinc roasted ore leaching process, and simultaneously realize the oxidative leaching of sulfides in zinc oxide powder and the reductive leaching of zinc ferrite in zinc roasted ore, thus simplifying the leaching process of zinc roasted ore and zinc oxide powder.

The invention belongs to the field of photocatalytic material preparation, and particularly relates to a ZnFe2O4 / TiO2 / BC composite material as well as a preparation method and application thereof. The novel photocatalytic material ZnFe2O4 / TiO2 / BC composite material is prepared through a sol-gel method and a coprecipitation method, the photocatalytic performance of titanium dioxide and zinc ferrite is improved, and the application field of titanium dioxide and zinc ferrite is widened. The dopant provided by the invention is relatively low in price, the process is relatively simple, and the photocatalyst with a wider light absorption range can be prepared and can be used for degrading sulfamethoxazole.

The invention relates to the technical field of manganese zinc ferrite materials, and particularly discloses a manganese zinc ferrite high-frequency high-impedance material and a preparation process thereof. The manganese zinc ferrite high-frequency high-impedance material is prepared from the following raw materials: Fe2O3, Mn3O4, ZnO, a carbon nanotube loaded rare earth oxide composite material, P2O5, Co2O3 and CaCO3. The preparation raw materials of the carbon nanotube loaded rare earth oxide composite material comprise a multi-walled carbon nanotube and a rare earth salt, and the mass ratio of the multi-walled carbon nanotube to the rare earth salt is 1: (0.12-0.14). According to the invention, the loss capability of the manganese zinc ferrite material to electromagnetic interference is enhanced, and the problem that the magnetic conductivity and impedance of the material are reduced in a high-frequency environment is solved.

This invention discloses a high Curie temperature, high frequency, and high impedance manganese-zinc ferrite material and its preparation method, belonging to the technical field of soft magnetic ferrite materials. The manganese-zinc ferrite material consists of a main component and secondary components. The main component, calculated as oxides, comprises Fe2O3: 48.5–49.9 mol%, ZnO: 18.5–21.5 mol%, NiO: 0.5–2.0 mol%, with the remainder being MnO. The secondary components, by weight of the main component, include at least four of the following: Co2O3: 0.05–0.30 wt%, SiO2: 0.005–0.01 wt%, CaCO3: 0.02–0.05 wt%, ZrO2: 0.01–0.02 wt%, Bi2O3: 0.01–0.03 wt%, and V2O5: 0.01–0.05 wt%, mixed in any proportion. The resulting manganese-zinc ferrite material exhibits excellent properties such as high impedance.

A rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material includes a rhombohedral zinc orthosilicate (Zn2SiO4) phase, a cubic zinc ferrite (ZnFe2O4) phase, and a hexagonal silicon dioxide (SiO2) phase. The rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material exhibits a morphology including spherical microscale particles with an average diameter ranging from 0.8 micrometer (μm) to 1.8 μm and irregular nanoscale aggregates with an average diameter ranging from 50 nanometer (nm) to 110 nm. The rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material has an adsorption capacity for basic fuchsin dye of greater than or equal to 140 milligrams per gram (mg / g). Furthermore, a method for producing the rhombohedral Zn2SiO4 / cubic ZnFe2O4 / hexagonal SiO2 / C nanocomposite material includes calcination of metal precursors.

The utility model discloses an optical module circuit board device with good anti-interference and heat-conducting properties, which comprises a circuit board body, an anti-interference cover is adhered to the top of the circuit board body, a heat-conducting wear-resistant cover is movably arranged at the position, close to the edge, of the top of the anti-interference cover, and supporting frames are movably and symmetrically arranged at the two ends of the bottom of the circuit board body. The anti-interference cover comprises an outer copper-clad plate layer, a nickel-zinc ferrite layer, a conductive rubber layer, a metal micro-powder wave-absorbing material layer and an inner copper-clad plate layer which are sequentially arranged from outside to inside, and the heat-conducting wear-resistant cover comprises a metal substrate, a ceramic substrate, a heat-conducting silica gel layer and a polymer insulating substrate which are sequentially arranged from outside to inside. According to the utility model, the anti-interference cover adhered to the top adopts a multi-layer structure, and the outer copper-clad plate layer, the nickel-zinc ferrite layer, the conductive rubber layer, the metal micro-powder wave-absorbing material layer and the inner copper-clad plate layer are sequentially arranged from outside to inside, so that external electromagnetic interference can be shielded and absorbed in all directions through the design.

A method for producing a soft magnetic manganese-zinc ferrite with a wide temperature range and high magnetic permeability for automotive electronics, characterized in that the material comprises main components and auxiliary components, wherein the main components comprise Fe₂O₃: 53 mol% to 55 mol%, ZnO: 16 mol% to 19 mol%, the remainder being Mn₃O₄, wherein, based on the total weight of the main components, the auxiliary components comprise nano-CaCO₃: 400 ppm to 1000 ppm, nano-TiO₂: 2000 to 6000 ppm, nano-Co₂O₃: 500 ppm to 2000 ppm, nano-Nb₂O₅: 100 ppm to 350 ppm, nano-SiO₂: 20 ppm to 150 ppm, nano-CuO: 0 ppm to 600 ppm, wherein the method for production comprises the following steps: Step 1, Preparation: the main components Fe2O3, ZnO and Mn3O4 are weighed according to their proportions and mixed by wet ball milling, with a mixing time of 10 to 40 minutes; Step 2, Pre-firing: the mixture obtained from step 1 is dried and pre-fired at 700 °C to 1000 °C, holding the temperature for 1 to 3 hours; Step 3, Grinding: the pre-burned material obtained from step 2 is shaken and the auxiliary components Nano-CaCO3, Nano-TiO2, Nano-Co2O3, Nano-Nb2O5, Nano-SiO2 and Nano-CuO are added according to the proportions, using the fluidized bed airflow milling method to grind the pre-burned material; Step 4, Granulation: the powder is granulated after airflow milling; Step 5, Pressing and Forming: it is pressed into a ring-shaped base body with the dimensions Ø 25mm in diameter * Ø 15mm in diameter * 7.5mm, with a density of 3.15g / cm³. 3 up to 3.35g / cm³ 3 amounts; Step 6, sintering, where the sintering temperature is 1200 to 1280°C, the holding time is 4 to 8 hours and the equilibrium oxygen content is 3.0 to 8.0%.

The invention discloses ultralow-loss manganese zinc ferrite and a preparation method thereof, and belongs to the technical field of ferrite soft magnetic materials. The ultralow-loss manganese zinc ferrite comprises the following raw materials: a main component, a first additive and a second additive, the main components comprise Fe2O3, ZnO and MnO; the first additive comprises one or more of SiO2 (silicon dioxide), TiO2 (titanium dioxide) and ZrO2 (zirconium dioxide); and the second additive is prepared from one or more of CaCO3, Co3O4, CuO and Al2O3. According to the invention, through step-by-step addition of the specific additives, comprehensive and effective reduction of the loss of the manganese-zinc ferrite core is finally realized, and the performance goal of ultra-low loss is achieved.

The present invention generally relates to a method for synthesizing dysprosium-doped copper-zinc ferrite nanomaterials with enhanced structural and functional properties. The method comprises dissolving stoichiometric quantities of copper nitrate trihydrate, zinc nitrate hexahydrate, iron nitrate nonahydrate, and dysprosium nitrate hexahydrate in distilled water to prepare an oxidizer solution. A fuel mixture is separately prepared using urea and glucose in equal proportions by weight. The oxidizer and fuel mixtures are combined in 1:1 ratio, calculated based on their respective oxidizing and reducing valencies, to form a homogeneous precursor solution. This solution is stirred thoroughly for about one hour and subsequently transferred to a Pyrex dish. The dish is placed in a muffle furnace preheated to approximately 450° C., where the solution undergoes a self-sustained combustion reaction, yielding a fine, porous Cu0.5Zn0.5DyxFe2-xO4 ferrite powder within 20 minutes. The resultant powder is ground to achieve uniform particle distribution suitable for advanced applications.

Broadband high T c High-conductivity manganese-zinc ferrite and preparation method, belong to ferrite material preparation technical field. High specific surface area raw material is adopted, contact area of powder in ball milling process is increased, reaction activity is improved, and sintering temperature is reduced; MnZn ferrite main formula adopts iron-rich zinc-deficient system, superexchange interaction is enhanced, and material Curie temperature is realized; secondary ball milling introduces combined additives, sintering process grain growth mechanism is regulated by means of fluxing and crystal resistance dual effects, Co2O3 is used to compensate MnZn ferrite magnetic crystal anisotropy constant, and initial magnetic permeability is improved; CaSiO3 is introduced, and is enriched in grain boundary in the sintering process, grain boundary resistivity is improved, and magnetic permeability frequency characteristic is improved; in the sintering process, oxygen partial pressure is accurately controlled in the holding and cooling stages, Fe 2+ Ion generation amount is influenced, sample resistivity is improved, and suitable sintering temperature and holding time are beneficial to grain growth and material densification.

The utility model provides a three-dimensional coil and planar coil combined wireless charging system, which relates to the technical field of wireless charging and comprises a transmitting end and a receiving end. The transmitting end comprises a direct-current power supply, an inverter circuit, a transmitting end compensation circuit and a transmitting coil; the receiving end comprises a receiving coil, a receiving end compensation circuit and a rectification filter circuit. Wherein the transmitting coil comprises a manganese zinc ferrite magnetic core and a three-dimensional coil, and the three-dimensional coil is spirally and densely wound on the outer side of the manganese zinc ferrite magnetic core; the receiving coil comprises a planar coil and manganese zinc ferrite flat magnetic bars, the planar coil is wound into a circular ring shape, the manganese zinc ferrite flat magnetic bars are alternately arranged on the circular ring-shaped planar coil along the normal direction and the tangential direction, and the difference between two adjacent normal manganese zinc ferrite flat magnetic bars is 60 degrees; the difference between two adjacent tangential manganese zinc ferrite flat magnetic bars is 60 degrees, and the difference between the adjacent normal manganese zinc ferrite flat magnetic bar and tangential manganese zinc ferrite flat magnetic bar is 30 degrees.

The utility model relates to the soft magnetic material production cleaning field especially relates to a raw material cleaning device for zinc ferrite high -grade soft magnetic material production. The utility model provides a raw material cleaning device for zinc ferrate high -grade soft magnetic material production, including support frame, outer layer cylinder, inner layer cylinder, motor, gear and gear ring etc. ; The outer layer cylinder is fixedly connected in the middle of support frame top, the inner layer cylinder is slidably connected in the outer layer cylinder, the motor is fixedly connected in the outer layer cylinder front side, the motor is located water pump right side, the gear is fixedly connected on motor output shaft, the outer layer cylinder outside edge is sleeved with gear ring, and the gear ring is mutually engaged with gear, the utility model drives the rotation of gear and gear ring through motor, makes the inner layer cylinder rotate in the outer layer cylinder, and this mechanized operation mode can more evenly, more completely wash zinc ferrate raw material, and compared with traditional cleaning mode not only has improved the efficiency, can guarantee the quality of cleaning.

The application discloses a preparation method and application of a polytriazimide / zinc ferrite photocatalytic composite material, and the composite material adopts a low-temperature molten salt method to prepare a high-crystallinity polytriazimide hexagonal prism as a structural reference; then zinc ferrite nanoparticles are in-situ grown on the surface of the hexagonal prism. The application in-situ grows visible light response semiconductor zinc ferrite nanoparticles on the surface of a polytriazimide hexagonal prism photocatalytic material for the first time; by constructing an organic / inorganic heterostructure, the defects of low utilization rate of visible light of the polytriazimide and acceleration of photogenerated carrier separation of a single-component material can be effectively solved, so that the overall photocatalytic activity of the composite material is improved. The photocatalytic composite material can be directly applied to removal of pathogenic microorganisms and organic antibiotic pollutants in water under visible light irradiation, and has great application prospect.

The invention provides a wide-temperature high-frequency high-impedance manganese zinc ferrite material and a preparation method thereof, and relates to the technical field of magnetic materials. The manganese zinc ferrite material comprises main components and auxiliary components, the main components comprise Fe2O3, ZnO, Mn3O4 and MgO, and the auxiliary components comprise Na2O, Co2O3, Li2O and K2O; the high-frequency high-impedance manganese-zinc ferrite material with the wide-temperature characteristic provided by the invention has the characteristics of high magnetic conductivity and high resistivity, is good in high-frequency impedance characteristic, relatively stable in magnetic conductivity and high-frequency impedance at the temperature of-40 to 120 DEG C, small in temperature influence change, and capable of stably working in an environment with sudden temperature change; and stable and safe operation of instruments and equipment is ensured.

This invention discloses a wide-temperature, low-loss manganese-zinc ferrite and its preparation method, belonging to the technical field of ferrite soft magnetic materials. The manganese-zinc ferrite comprises a main component, a first additive, and a second additive; the main component includes Fe2O3, ZnO, and MnO; the first additive includes one or more of SnO2, TiO2, Cr2O3, Co3O4, and CuO; the second additive includes one or more of SiO2, CaCO3, ZrO2, Nb2O5, and Ta2O5. The preparation method includes the following steps: primary ball milling; primary sintering; secondary ball milling; granulation; molding; and secondary sintering. This invention optimizes the preparation process by adding additives with different functions in batches during the primary and secondary ball milling processes, and makes simple adjustments to the primary and secondary sintering processes, thereby effectively reducing the core loss of the manganese-zinc ferrite and improving its temperature stability.

The embodiment of the application discloses high magnetic permeability manganese-zinc ferrite broadband material KAH150 material and a preparation method thereof, the material has the magnetic permeability ui in the range of 10000-15000+ / -25% under the condition of 10-200KHZ frequency; the Curie temperature Tc of the material is greater than 130 DEG C; the method comprises the following steps: obtaining raw materials according to the proportioning mode that Fe2O3 is 51.2-54.5mol%, ZnO is 19.1-22.40mol%, and the rest is MnO; the raw materials are sequentially subjected to ball milling, pre-sintering, secondary sand milling, spray granulation, blank preparation and sintering treatment, and the high magnetic permeability manganese-zinc ferrite broadband material KAH150 material is obtained. Through the combination adjustment of fixed formula and doping, the material magnetic permeability can still maintain ui >=10000 at 200KHZ, and the high-frequency performance is greatly improved.

This application provides a filler for an encapsulation material and its preparation method, a magnetic molding compound, and an encapsulation device. The filler for the encapsulation material includes ferrite particles, wherein the ferrite particles include nickel-copper-zinc ferrite (Ni... a Zn b Cu c Fe d The O4 material has the following properties: a ranges from 0.3 to 0.55, b ranges from 0.45 to 0.55, c ranges from 0 to 0.2, and d ranges from 1.8 to 2. The ferrite particles have a particle size of 2-11 μm, accounting for 50-70% of the total. This filler has advantages such as low relative density, wide absorption bandwidth, and good high and low temperature performance, thereby reducing the overall weight of the packaged device and improving its electromagnetic interference resistance and applicable temperature range.

A method for preparing a zinc ferrite-based catalyst according to an embodiment of the present application comprises the steps of: contacting a metal precursor solution including a zinc precursor, a ferrite precursor, an acid solution and water with a basic aqueous solution to obtain a precipitate; and filtering and thereafter drying and calcining the precipitate, wherein the acid solution includes one or more of nitric acid (HNO3) and hydrocarbon acid.

The utility model discloses a kind of manganese-zinc ferrite core intelligent heat treatment forming mould, it is related to magnetic core forming mould technical field, including bottom mould and temperature control unit;Bottom mould: top surface and the bottom surface of top mould correspond with and cooperate, the inside of bottom mould is equipped with stripping unit;Temperature control unit: including electromagnetic heater, fixed plate, electromagnetic heating ring, fixed groove and heating ring groove, the inside of bottom mould is opened in heating ring groove, the top surface of bottom mould is opened in fixed groove, heating ring groove is linked with fixed groove, the bottom surface of fixed plate is fixed with electromagnetic heating ring, electromagnetic heating ring is placed in the inside of heating ring groove, this manganese-zinc ferrite core intelligent heat treatment forming mould, accurate temperature control is realized by the intelligent linkage of electromagnetic heating ring and temperature sensor, ensure that manganese-zinc ferrite core is evenly heated, improve magnetic permeability and reduce loss, while electromagnetic heating technology is energy-saving and efficient, prolongs mould life.

The application discloses a method for recovering zinc and lead metals from lead-rich slag generated in a zinc smelting process, which comprises low-temperature acid leaching, magnetic separation, oxidation heap leaching, stirring leaching and the like processes, so that the lead-rich slag is subjected to low-temperature acid leaching and magnetic separation first, zinc compounds which are easily soluble are leached out sufficiently, and the content of iron ions entering the liquid phase is effectively reduced, thereby reducing the interference of iron ions in the zinc liquid, then the processes of oxidation heap leaching and stirring leaching are combined, and zinc ferrite and zinc sulfide minerals which are difficult to be acid-dissolved can be further dissolved, the zinc-containing substances basically enter the liquid phase, the target of separating lead and zinc is achieved, and finally, combined with dilute hydrochloric acid washing, part of calcium and silicon compounds can be dissolved, so that the lead grade in the final slag is improved, and comprehensive utilization is realized.

The invention relates to the technical field of nylon yarn processing, and discloses a wide-temperature soft magnetic manganese zinc ferrite preparation process, which comprises: S1, raw material preparation, S2, sanding pre-sintering, S3, spray granulation, and S4, sintering. A lifting switching structure, a first sanding structure and a presintering structure are arranged, and two preparation cylinders are arranged on a fixed column through a rotating structure, so that after sanding in one preparation cylinder is finished, the first sanding structure is taken out of the corresponding preparation cylinder through the lifting switching structure; meanwhile, the rotating structure is matched to automatically drive the corresponding preparation cylinder to move and switch to the presintering structure for presintering work, and the next preparation cylinder can be driven to rotate and switch to the first sanding structure for sanding, so that on the same sintering sanding device, ingredients can be transferred in time for sanding and presintering preparation, and the production efficiency is improved. The operation is more labor-saving and convenient, and the working efficiency is higher.

The invention discloses a manufacturing method of a high-frequency manganese zinc ferrite material, and belongs to the technical field of ferrite soft magnetic materials. The manufacturing method comprises the following steps: S1, primary burdening; s2, primary ball milling; s3, primary sintering is conducted, and primary sintered powder is obtained; s4, secondary ball milling: adding an additive into the primary sintered powder, and performing ball milling to obtain secondary ball-milled powder; s5, granulation: adding a polyvinyl alcohol aqueous solution into the secondary ball-milled powder, pre-pressing, grinding, and sieving to obtain particles; s6, forming: pressing and forming the particles into a T25 * 15 * 7.5 magnetic ring; s7, secondary sintering: sintering the magnetic ring to obtain a sintered body; and S8, aging: raising the temperature of the sintered body from normal temperature to 300-500 DEG C for 60-180 minutes, preserving heat for 1-5 hours, and then cooling to normal temperature after 60-180 minutes to obtain the manganese-zinc ferrite. According to the invention, low loss under a high-frequency condition is realized, the use requirement of the manganese zinc ferrite for high-frequency 2MHZ is improved, and the requirement of upgrading a server power supply is promoted.

The application discloses a method for improving zinc leaching rate in zinc residue, which is carried out according to the following steps: (1) mechanical activation pretreatment: zinc residue containing zinc ferrite and a reducing agent containing FeS2 are placed in sulfuric acid solution I for ball milling activation to obtain surface-activated ore slurry; (2) hot acid leaching: the obtained surface-activated ore slurry is transferred to sulfuric acid solution II for reaction leaching, and then the obtained reaction product is subjected to solid-liquid separation to obtain zinc leaching solution. The zinc residue is subjected to composite treatment through mechanical activation-pyrite reduction-hot acid leaching: on the one hand, the surface lattice of zinc ferrite is destroyed through mechanical chemical action to increase the reactive active site thereof; on the other hand, the reducing agent containing FeS2 releases reducing sulfur species H2S and S2 in an acid system to reduce Fe3+ in zinc ferrite to Fe2+. 2‑ Fe 3+ in zinc ferrite is reduced to Fe 2+ 2+. The application realizes selective extraction of zinc, effectively inhibits synchronous dissolution of iron, and makes the zinc leaching rate reach more than 96%.

This invention relates to the field of manganese-zinc ferrite materials technology, and discloses a wide-temperature, low-loss, high-Bs manganese-zinc ferrite material, comprising a main component and auxiliary components. The main component consists of Fe2O3, ZnO, and MnO, while the auxiliary components consist of Co2O3, Ca2CO3, Nb2O5, ZrO2, SiO2, NiO, SnO2, and TiO2. The total amount of auxiliary components relative to the main component is calculated as a weight percentage. This invention compensates for the magnetocrystalline anisotropy constant K1 of the ferrite matrix by adding multiple auxiliary components and optimizing the combination of their addition amounts. This reduces the magnetocrystalline anisotropy constant K1 over a wide temperature range, achieving characteristics such as wide-temperature, low-loss, and high Bs. By controlling the addition range of the main and auxiliary components, the process enables the manganese-zinc ferrite to possess both low-loss and high-Bs characteristics at different temperatures.

The application provides a manganese-zinc ferrite material and a preparation method and application thereof. The manganese-zinc ferrite material can have an initial permeability μi of 1837 H / m or higher, a saturation magnetic induction intensity Bs of 572 mT or higher at 25 DEG C, and a saturation magnetic induction intensity Bs of 487 mT or higher at 100 DEG C through specific setting of a formula, so that the power conversion efficiency of an electronic component is improved.

The invention discloses high-thermal-conductivity and high-mechanical-strength manganese-zinc ferrite and a preparation method thereof, and relates to an electronic material technology. The MnO-Fe2O3 composite material comprises a main component and an additive, and is characterized in that the main component comprises 51.0-53.0 mol% of Fe2O3, 10.0-11.0 mol% of ZnO and the balance of MnO; the additive is prepared from the following components in percentage by weight: 0.01 to 0.05 weight percent of NiO, 0.01 to 0.05 weight percent of Nb2O5, 0.01 to 0.05 weight percent of ZrO2, 0.2 to 0.4 weight percent of Co2O3, 0.02 to 0.05 weight percent of YIG (Yttrium Iso Glycol) and 0.01 to 0.04 weight percent of SnO2 on the basis of the weight of the pre-sintered main components. According to the invention, through synergistic doping of nano YIG particles and SnO2 and optimization of sintering process design, synergistic improvement of thermal conductivity and densification of the manganese-zinc ferrite material is realized on the premise of ensuring electromagnetic performance.

The application relates to a ceramic wave-absorbing metamaterial and a preparation method thereof, which comprises at least three layers of ceramic base loss unit layers, ceramic base impedance regulation unit layers and metal mesh layers which are alternately stacked; the ceramic base loss unit layer comprises a ceramic matrix A and wave-absorbing agent A dispersed in the ceramic matrix A, wherein the wave-absorbing agent A is composed of a composite powder of nano silicon carbide with a particle size of 50-200 nm and a nickel-zinc ferrite ceramic powder; the ceramic base impedance regulation unit layer comprises a ceramic matrix B and wave-absorbing agent B dispersed in the ceramic matrix B, wherein the wave-absorbing agent B is composed of a composite powder of barium titanate with a particle size of 100-500 nm and tin oxide. The ceramic wave-absorbing metamaterial has a reflection loss of less than or equal to -10 dB in a 1-8 GHz frequency band, and a reflection loss of less than or equal to -25 dB in an 8-18 GHz frequency band.

This invention discloses an X-band high-power lithium-zinc ferrite material and its preparation method, belonging to the technical field of high-power lithium-zinc ferrite material preparation, including a main material and additives, wherein the main material is Li. (0.605‑0.5x) Zn 0.05 Co x Ti 0.26 Mn 0.06 Fe (2.025‑0.5x) O 4‑δ The additives, based on the mass of the main material, include: 0.05–0.4 wt% Sb₂O₃, 0.4–1.2 wt% Bi₂O₃, and 0.01–0.02 wt% Dy₂O₃. A two-step sintering method is used: first, sintering at 910–930℃ for 1–2 h, then sintering at 950–1050℃ for 2–5 h, yielding an X-band high-power lithium-zinc ferrite material with high spin linewidth, high remanence ratio, and low ferromagnetic resonance linewidth.

The application belongs to the technical field of electromagnetic shielding materials, and particularly relates to a manufacturing method of a conductive foam and ferrite composite shielding structure. The application discloses a conductive foam-ferrite composite shielding structure and a manufacturing method thereof. The structure is formed by pre-compressing a conductive foam base body (compression rate 50-70%), dipping a nickel-zinc ferrite slurry (D50=2-3 microns), step curing (80 DEG C to 120 DEG C), magnetron sputtering a NiCu transition layer (150-250 nm), electroplating a SnBi alloy layer (3-8 microns), and laser cutting to form a 28-32% open porosity grid. The structure realizes a shielding effectiveness of 92 dB at a frequency of 10 GHz (84% higher than that of pure foam), an interfacial shear strength of 15 MPa, a thermal expansion coefficient of 8*10 ‑6 / ℃, resistance to 260 DEG C reflow soldering for 3 times, an oxidation resistance time of >5000 hours, and is suitable for electromagnetic shielding of high-frequency electronic equipment.

Provided in the present application are a nickel-zinc ferrite material, and a preparation method therefor and the use thereof. The nickel-zinc ferrite material comprises a main material, a functional additive and a correcting agent, wherein the main material comprises Fe2O3, Ni2O3, ZnO and CuO; the functional additive comprises a combination of any three or at least four of Mn3O4, TiO2, Ta2O5, Co2O3 or Sm2O3; and the correcting agent comprises Fe2O3 and Ni2O3. In the present invention, an appropriate main formula correction process is used, and a suitable and inexpensive correcting agent and a functional additive are added to a ferrite material, such that the power loss of the prepared nickel-zinc ferrite material at 13.56 MHz can be significantly reduced.