3D Printing of Ferrite with High Magnetic Performance and Its Applications

Abstract

Abstract: It is difficult or even unable for traditional ceramic processing methods to prepare complex structures with high performance. To overcome this, a direct ink writing based three-dimensional (3D) printing technology was used to near net-shape ceramic structures by the preparation of printable ceramic pastes. In this work, the influence of zinc content on the properties of nickel zinc ferrite was investigated in terms of microstructures, crystal structures, and magnetic properties. The results show that the saturation magnetization (M_s) of nickel zinc ferrite reaches 76.3 emu/g, when zinc content x is 0.4 in Ni_1-xZn_xFe₂O₄, because Zn²⁺ occupies the tetrahedral (A) position due to the cation distribution effect. Moreover, through the preparation of ceramic pastes, nickel zinc ferrite with complex mesh structures can be shaped using the direct writing 3D printing approach. The results show that 3D printed soft magnetic nickel zinc ferrite with a dense mesh structure is obtained after sintering. In the following, the 3D printed magnetic mesh is used to separate magnetic particles under a relatively low magnetic field. Overall, the ferrite mesh structures can be served as a magnetic medium to significantly enhance the magnetic flux density and magnetic field gradient, and therefore is capable of effectively improving the separation efficiency of magnetic particles. Finally, the high gradient magnetic separation is simulated and verified by finite element numerical COMSOL simulation.

Key words: NiZn ferrite, 3D printing, mesh structure, sintering temperature, magnetic separation

CLC Number:

TB321

WEI Xiangxia, XIE Yanan. 3D Printing of Ferrite with High Magnetic Performance and Its Applications[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 1972-1978.

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