Hebei Messi Biology Co., Ltd. stated that with the rapid development of miniaturization and high frequency of electronic devices, higher requirements have been put forward for soft magnetic materials, which require high magnetic permeability and low high-frequency loss at the same time. Magnetic composite material, also known as magnetic powder core, combines the advantages of metal and ferrite soft magnetic materials. Its resistivity is significantly higher than that of soft magnetic metal, which can effectively reduce eddy current losses and has higher saturation than soft ferrite. Magnetization strength, let’s learn about the application of magnesium oxide in soft magnetic composite materials.
Provided is a method for preparing an oxide-coated iron-silicon-cadmium soft magnetic composite material. The preparation method involves thermal decomposition of metal powder and magnesium acetate solution to obtain semi-finished metal powder coated with magnesium oxide; and then the semi-finished product is The metal powder is mixed with an organic binder to obtain an oxide-coated iron-silicon-cadmium soft magnetic composite material with a moderate thickness of the magnesium oxide coating and a low magnetic permeability reduction ratio under the superposition of a DC electric field.
Using iron-silicon-cadmium metal alloy powder to prepare soft magnetic composite materials, compared with the existing technology that uses iron-silicon-aluminum metal alloy powder to prepare soft magnetic composite materials, can obtain a dense magnesium oxide protective film after heating and decomposition, effectively improving It has the advantage of improving the resistivity and reducing the loss under high-frequency magnetic field; then the magnesium acetate solution is mixed with the metal powder and heated and decomposed because the magnesium acetate solution has the advantages of easy decomposition and low price. It is used in semi-finished metal products. After the powder is coated with magnesium oxide, the magnetic properties of the soft magnetic composite material can be significantly improved; finally, the semi-finished metal powder is mixed with an organic binder, which can improve the magnetic properties of the product oxide-coated iron-silicon-cadmium soft magnetic composite material. The resistivity, on the other hand, is also conducive to the further pressing and molding of the produced product to facilitate subsequent processing and use.
Hebei Messi Biology Co., Ltd. stated that the preparation method is simple to operate, and the obtained magnesium oxide-coated soft magnetic composite material has excellent performance. Under the superposition of a DC electric field, the magnetic permeability decrease rate can reach less than 22.7%. Under optimal conditions, , the magnetic permeability reduction ratio can reach below 6.9%, which is suitable for large-scale promotion and application; the magnesium oxide-coated soft magnetic composite material obtained by the preparation method of the oxide-coated iron-silicon-cadmium soft magnetic composite material provided by the invention Compared with magnetic rings of the same specifications made of other soft magnetic materials, the density of magnetic rings can reach more than 5.58g/cm3. Under optimal circumstances, the density can reach more than 6.09g/cm3, that is, the density per unit volume The high content of magnetic powder is beneficial to its wide application in small electronic devices.