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Title: Ferrite-based soft and hard magnetic structures by extrusion free-forming
Authors: Peng, E 
Wei, X
Herng, T.S 
Garbe, U
Yu, D
Ding, J 
Keywords: Ceramic materials
Magnetic materials
Magnetic structure
Metal extrusion
Metallic compounds
Powder metals
Praseodymium compounds
Solid state reactions
Bulk magnetization
Functional ceramics
Hard magnetic material
High temperature solid-state reaction
Metal oxide powders
Polycrystalline microstructure
Printed structures
Three dimensional morphology
Saturation magnetization
Issue Date: 2017
Citation: Peng, E, Wei, X, Herng, T.S, Garbe, U, Yu, D, Ding, J (2017). Ferrite-based soft and hard magnetic structures by extrusion free-forming. RSC Advances 7 (43) : 27128-27138. ScholarBank@NUS Repository.
Abstract: Functional ceramic materials, especially those with unique magnetic properties, with complex geometries have become increasingly important for various key technologies in industry. Herein, ferrite-based soft (NiFe2O4) and hard (BaFe12O19) bulk magnetic structures with three-dimensional morphologies are successfully fabricated from inexpensive metal oxide powder (NiO/Fe2O3 and BaCO3/Fe2O3) precursors through a simple extrusion free-forming (EFF) technique coupled with a high temperature solid-state reaction process. Dense polycrystalline microstructures with negligible porosity are observed for samples sintered above 1200 °C and highly crystalline NiFe2O4 and BaFe12O19 phases are successfully formed. The printed structures also exhibit either soft or hard magnetic material behavior with (i) saturation magnetization values up to approximately 86% and 95% of the NiFe2O4 and BaFe12O19 theoretical bulk magnetization values, respectively, and (ii) high densities up to ?93% of their respective theoretical bulk density. Bulk magnetic structures with unique geometries (e.g. mesh, gear, ring and cylinder) are successfully fabricated. The EFF technique demonstrated in this work can be readily extended to other functional ferrite or titanate ceramic materials simply by changing the metal oxide powder precursors. © 2017 The Royal Society of Chemistry.
Source Title: RSC Advances
ISSN: 20462069
DOI: 10.1039/c7ra03251j
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