Ferrite-based soft and hard magnetic structures by extrusion free-forming

Peng, Erwin; Wei, Xiangxia; Herng, Tun Seng; Garbe, Ulf; Yu, Dehong; Ding, Jun

doi:10.1039/c7ra03251j

Cited by 74 publications

(47 citation statements)

References 44 publications

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“…Incorporation of magnetic materials into a printable matrix enables printing of complex 3D shapes and structures with magnetic properties and fabrication of actuators, sensing devices, reinforced structures, and medical devices …”

Section: Magnetic Materialsmentioning

confidence: 99%

Hybrid Materials for Functional 3D Printing

Cooperstein

Keneth

Shukrun-Farrell

et al. 2018

Adv Materials Inter

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This review focuses on the development of hybrid materials based on inorganic–organic compositions with improved and new functionalities, and their utilization for 3D printing of various devices: magnetic materials, flexible and stretchable materials for conductive and shape‐memory devices, materials for photonics and optics, materials with enhanced mechanical properties, and dielectric and piezoelectric materials. Various methods of functional 3D printing are briefly discussed.

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Section: Magnetic Materialsmentioning

confidence: 99%

Hybrid Materials for Functional 3D Printing

Cooperstein

Keneth

Shukrun-Farrell

et al. 2018

Adv Materials Inter

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“…for more than five decades . Nowadays, it has been applied to various aspects of practical engineering areas such as energy harvesting, automobile, aircraft, and information storages, due to unique properties including but not limited to electrical, magnetic, and optical properties . Among the electrical properties, ferroelectric materials have been widely used in the modern technology aforementioned.…”

Section: Introductionmentioning

confidence: 99%

“…Currently there are several conventional methods used for processing bulk BT ceramics, which press BT powders in a mold and fire them at high temperature, such as slip casting, compaction (uniaxial or isostatic), tape casting, extrusion, and, filter pressing, drying casting, injection molding . They have a couple of disadvantages on demolding and subsequent handling without shape deformation during process and limitations to varying geometric shapes, complexity, and microstructural control due to expansive molds …”

Section: Introductionmentioning

confidence: 99%

“…Selective laser sintering and binder jetting techniques, which are using a laser beam to fuse materials selectively and coating ceramic powders onto the printing bed, respectively, have been studied for printing BaFe 12 O 19 , PZT, and BaTiO 3 bulk ceramic materials . Some researchers reported that the printed structures are rather porous and not suitable for fabrication of dense structure as well as requiring expensive equipment . Among other AM techniques, paste extrusion (PE) 3D printing (ie, robocasting and direct ink writing) has been widely studied due to its advantages such as flexibility and low cost due to inexpensive equipment .…”

Section: Introductionmentioning

confidence: 99%

“…DMF, which is used to dissolve PVDF, also has a property of plasticizer which is an additive to decrease viscosity of the material. Proper binder and plasticizer ensure the proper rheology of the colloidal suspensions for extrusion . Therefore, the combination of these solutions plays multiple roles of binder, plasticizer, and dispersant on the ceramic suspensions as well as increasing volume density of ceramic powder due to high density of PVDF.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of bulk piezoelectric and dielectric BaTiO₃ ceramics using paste extrusion 3D printing technique

et al. 2018

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A simple and facile method was developed to fabricate functional bulk barium titanate (BaTiO3, BT) ceramics using the paste extrusion 3D printing technique. The BT ceramic is a lead‐free ferroelectric material widely used for various applications in sensors, energy storage, and harvesting. There are several traditional methods (eg, tape casting) to process bulk BT ceramics but they have disadvantages such as difficult handing without shape deformation, demolding, complex geometric shapes, expansive molds, etc. In this research, we utilized the paste extrusion 3D printing technique to overcome the traditional issues and developed printable ceramic suspensions containing BT ceramic powder, polyvinylidene fluoride (PVDF), N,N‐dimethylformamide (DMF) through simple mixing method and chemical formulation. This PVDF solution erformed multiple roles of binder, plasticizer, and dispersant for excellent manufacturability while providing high volume percent and density of the final bulk ceramic. Based on empirical data, it was found that the maximum binder ratio with good viscosity and retention for desired geometry is 1:8.8, while the maximum BT content is 35.45 vol% (77.01 wt%) in order to achieve maximum density of 3.93 g/cm3 (65.3%) for 3D printed BT ceramic. Among different sintering temperatures, it was observed that the sintered BT ceramic at 1400°C had highest grain growth and tetragonality which affected high performing piezoelectric and dielectric properties, 200 pC/N and 4730 at 103 Hz respectively. This paste extrusion 3D printing technique and simple synthesis method for ceramic suspensions are expected to enable rapid massive production, customization, design flexibility of the bulk piezoelectric and dielectric devices for next generation technology.

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