32results about How to "Bs high" patented technology

The invention discloses a 4-element formula ultra-high Bs manganese zinc ferrite material and a preparation method. It includes the main components of ferric oxide, manganese oxide, zinc oxide and nickel oxide, and the auxiliary components are mainly calcium carbonate and zirconium dioxide, and the auxiliary components include tungsten trioxide, molybdenum trioxide and niobium pentoxide. One or more, the raw materials composed of Fe2O3, MnO, ZnO, NiO are mixed in a sand mill, after drying, they are pressed into a round cake under a pressure of 10Mpa, and then pre-fired; the quality of the powder after pre-burning As a benchmark, add the corresponding amount of auxiliary components for secondary sanding, and dry the secondary sanding slurry for particle size testing; add PVA and spray granulation, and shape it into a standard ring magnetic core for sintering. The beneficial effect of the present invention is that its high Bs characteristic can be fully utilized, and the temperature rise can also be satisfied; at the same time, the material cost is far lower than that of the magnetic powder core material, which can better meet the performance of high-power high-power-density power transformer design and cost requirements.

The present invention provides a method for preparing Fe-Si-Al soft magnetic alloy powder capable of self-passivation and insulation, that is, during the alloy smelting process, the element P is rapidly cooled and cast to obtain crystal materials; The element P migrates to the crystal interface and is enriched on the crystal surface; followed by ammonia decomposition and annealing, the trace amount of H in the atmosphere 2 O combines with element P on the surface of the powder to make the powder self-passivated to form a phosphating layer. The passivated sendust powder has good insulating properties. The self-insulation of the powder prepared by the method of the present invention does not require a phosphating process, and can be pressed directly by adding resin and lubricant, thereby avoiding environmental protection and safety problems caused by the phosphating process while reducing production costs. The sendust magnetic core produced by this powder has extremely low magnetic loss characteristics, high Bs value of the magnetic core, and excellent DC superposition characteristics; the molding pressure is reduced, and the life of the press and mold is extended.

The invention discloses a MnZn ferrite magnetic core with double characteristics and a manufacture method. The magnetic core consists of main components and auxiliary components. The main components consist of Fe2O3 54-56 mol%, ZnO 5-10 mol% and the balance manganese oxide, wherein the sum of the Fe2O3, the ZnO and the manganese oxide is 100 mol%. The auxiliary components comprise a first auxiliary material, a second auxiliary material, a third auxiliary material and a selectable fourth auxiliary material, wherein the first auxiliary material is an oxide of Co, the second auxiliary material is one of Ni2O3, NiO or Li2CO3, the third auxiliary material is selected from CaCO3 and Nb2O5, and the fourth auxiliary material is selected from SiO2, V2O5 and ZrO2. The shortcoming that a common MnZn power ferrite material cannot integrate multiple characteristics is overcome, the MnZn ferrite magnetic core has the double characteristics of high temperature and Bs and wide temperature and low loss, the unit volume loss Pcv (100kHz, 200mT) of the magnetic core at the temperature of 25 DEG C to 120 DEG C is smaller than 350 kW / m<3>, the lowest loss at the temperature of about 90 DEG C is 300 kW / m<3>, and the saturation magnetic flux density can reach to 450 mT at the temperature of 100 DEG C.

The invention provides a magnetic isolation sheet for wireless charging and a preparation method thereof. The present invention prepares high Bs and low-loss powders through tunnel kiln debinding, bell furnace sintering and slicing after raw material batching, tabletting, low-temperature pre-firing, adding trace auxiliary materials and other substances, spray granulation, and compression molding. Magnetic isolation sheet. At the same time, the preparation method of the magnetic isolation sheet for wireless charging provided by the present invention can prepare the magnetic isolation sheet in batches to meet production requirements.

The present invention proposes a preparation method of a high Bs value, low power loss soft ferrite material and magnetic core, optimizes the main formula and effective doping, develops a high Bs, low power consumption soft ferrite material, and the final product The grain size is 3-4μm, the initial magnetic permeability ui reaches more than 2200, and the power loss is 380-420kW / m at 80℃~120℃, 100kHz, 200mTBs value 3 , and the Bs value at 100°C is above 450mT; the multi-stage balanced atmosphere sintering method is adopted to control the density, grain size, porosity and their distribution inside and between the grains of the ferrite material, so that the soft magnetic ferrite The microstructure of the material is more effectively controlled, thereby ensuring that the main characteristic parameters of the material are harmoniously unified; the quality of the final product is high, and the production cost is reduced by more than 20%.

The invention belongs to the field of magnetically soft alloy and particularly discloses a low-angle-difference nanocrystalline magnetically soft alloy magnetic core for an intelligent electric meter and a preparation method thereof. The molecular formula of the magnetic core is shown as follows: Fe100-a-b-c-d-eSiaBbMcCudNbeM'f, wherein a, b, c, d, e and f are atomic percents, 8<=a<=14, 2<=b<=10, 0.8<=c<=3, 1<=d<=4, 0.5<=e<=2, 0.02<=f<=0.5, the balance is Fe and unavoidable impurities, M is Al or Zn, and M' is one or more of Y, Gd, V, Mo, Mn, Ge, Er, Ga and Sn. The magnetic core which is prepared through a resultant magnetic field annealing treatment method and is excellent in soft magnetic property is further provided, and the requirement for high-precision measurement with a low-angle-difference mutual inductor for the intelligent electric meter is met.