Magnetic powder substances can be used to make magnetic plastics
Magnetic powder substances can be used to make magnetic plastics
At present, the commercialized magnetic powder materials are divided into two categories: ferrite and rare earth. Ferrite magnetic powder is a ceramic powder made by grinding, drying, calcining and regrinding by adding ferric oxide as the main raw material and adding an appropriate amount of oxides or carbonates of metals such as zinc, magnesium, barium, strontium, and lead. . The commonly used ferrite magnetic powder is barium ferrite, especially strontium ferrite with large single domain particle radius and large magnetic anisotropy constant. The magnetic powder particles are in the shape of a hexagonal plate, which is perpendicular to the axial direction of the hexagonal plane, that is, the NS direction.
Rare earth magnetic powder is affected by price and resources, and the usage amount is less than one tenth of that of ferrite magnetic powder, but it has stronger magnetic properties and better processing performance when used to make magnetic plastics.
The rare earth magnetic powders currently used are mainly 1 to 5 type and 2 to 17 type, that is, the composition ratio of rare earth elements and transition elements is 1:5 and 2:17 respectively, the former is mainly Smz (Co, Fe, Cu, M)17 (M = Zr, Hf, Nb, Ni, Mn, etc.). Masterbatch Granulator
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