Net-shaped barium and strontium ferrites by 3D printing with enhanced magnetic performance from milled powders

Net-shaped hexagonal barium and strontium ferrites with desirable shapes have been successfully fabricated by the extrusion-based three-dimensional (3D) printing. The influence of milling and calcination conditions on magnetic properties of as-printed hexaferrites are systematically investigated by...

Full description

Saved in:
Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-01, Vol.493, p.165664, Article 165664
Main Authors: Wei, Xiangxia, Liu, Yinhua, Zhao, Dongjie, Mao, Xuewei, Jiang, Wanyue, Ge, Shuzhi Sam
Format: Article
Language:English
Subjects:
3-D printers
3D printing
Barium
Coercivity
Extrusion
Ferrites
Ferromagnetism
Grain growth
Heat treatment
Hysteresis loops
Magnetic materials
Magnetic measurement
Magnetic properties
Magnetic saturation
Magnetic separation
Magnetism
Mechanical milling
Milled powders
Nanoparticles
Net-shaping without residues
Strontium
Three dimensional printing
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Net-shaped hexagonal barium and strontium ferrites with desirable shapes have been successfully fabricated by the extrusion-based three-dimensional (3D) printing. The influence of milling and calcination conditions on magnetic properties of as-printed hexaferrites are systematically investigated by vibrating sample magnetometry (VSM). The typical ferromagnetic hysteresis loops are observed, revealing that the resulting bulk ferrites derived from the preliminary milled powders are prefect hard magnetic materials. In particular, it is clear that the saturation magnetization is very close to the theoretical values after calcinations. Moreover, the coercivity can be effectively enhanced in the range of 4–6 kOe upon thermal treatment, which is a much higher value compared to ferrites prepared by the conventional ceramic processing. More importantly, the maximum energy product can be significantly improved to as high as around 2.5 MGOe for the 3D-printed strontium ferrites. This is attributed not only to fine precursor powders subjected to mechanical milling, but also to the optimized annealing for grain growth with sizes near the critical single domain limit. Overall, the fabrication of bulk ferrites derived from milled powders using the 3D printing is attractive for the large-scale applications, and may also pave the way for some specific applications, for instance, magnetic separation for nanoparticles.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.165664