Microstructure, magnetic and mechanical properties of Ni–Zn ferrites prepared by powder injection moulding

Abstract

Keywords: PIM Ni-Zn ferrites Mechanical properties Magnetic propertiesNowadays, the electronic industry demands small and complex parts as a consequence of the miniaturization of electronic devices. Powder injection moulding (PIM) is an emerging technique for the manufacturing of magnetic ceramics. In this paper, we analyze the sintering process, between 900 °C and 1300 °C, of Ni-Zn ferrites prepared by PIM. In particular, the densification behaviour, microstructure and mechanical properties of samples with toroidal and bar geometry were analyzed at different temperatures. Additionally, the magnetic behaviour (complex permeability and magnetic losses factor) of these compacts was compared with that of samples prepared by conventional powder compaction. Finally, the mechanical behaviour (elastic modulus, flexure strength and fracture toughness) was analyzed as a function of the powder loading of feedstock. The final microstructure of prepared samples was correlated with the macroscopic behaviour. A good agreement was established between the densities and population of defects found in the materials depending on the sintering conditions. In general, the final mechanical and magnetic properties of PIM samples were enhanced relative those obtained by uniaxial compaction.

Co-Ni-Zn Ferrites Fabricated by Spark Plasma Sintering

“…70 % improvement could be observed as compared to relative density. The achieved higher K IC values of 2.5 MPam −1/2 is also significantly higher as compared with ferrites sintered by conventional (0.85 MPam −1/2 ) or other special (1.24 MPam −1/2 ) method [19,20].…”

Study of the densification, mechanical and magnetic properties of Ni–Zn ferrites sintered in a solar furnace

“…6). Gutiérrez-López et al [18] demonstrated that in EF samples, small (approximately 1 ȝm) holes and cavities of a size in the range of 20-25 ȝm appear between the grains. Therefore, the fracture was mainly intergranular because the grains were not well linked, with each grain being surrounded by micropores.…”

Fabrication of micron-sized Al/Ni tetrapod particles with self-propagating exothermic function

“…The injection molding technique has several common advantages, such as the absence of material loss, easy 3D-complex-shape forming, and easy dimension control (dimensional precision = ±0.5%). [19][20][21][22] Al powders with diameters of 3 and 30 µm (Toyo Aluminium 11-0050 and 11-0052, respectively) were used as starting materials. Three different types of organic compounds with different melting points were blended to prepare a binder because cracks are introduced very often after degreasing when using an organic binder with one melting point.…”