Magnetic slip casting for dense and textured ceramics: A review of current achievements and issues

Abstract

Ceramic materials are ubiquitous in technologies operating under high mechanical, thermal or chemical constrains. Research in ceramic processing aims at creating ceramics with properties that are still challenging to obtain, such as toughness, transparency, conductivity, among others. Magnetic slip casting is a ceramic process where an external magnetic field is used to align the ceramic grains along preferential crystallographic directions, thereby creating controlled texture. Over the past 20 years of research on magnetic slip casting, ceramics of multiple chemistry were found to exhibit enhanced properties as a result from the texturation. This paper reviews the progress in the field of magnetic slip casting, details the processing parameters, the textures obtained for a diverse range of ceramic materials. The achieved mechanical and functional properties of the magnetically textured parts are presented. This overview of the magnetic slip casting process allows to identify critical directions for future advancement in advanced technical ceramics.

Magnetically assisted drop-on-demand 3D printing of microstructured multimaterial composites

“…As ϕ f increased, the alignment of the microplatelets improved. When ϕ f increased beyond 14 vol%, the xirallic platelets become well aligned to the target alignment with a misalignment less than 18°, which is similar to what is obtained in other magnetically-oriented vertical structures 21 . It is interesting to note that this trend in platelet alignment is only dependent on ϕ f regardless of the substrate used.…”

Controlled local orientation of 2D nanomaterials in 3D devices: methods and prospects for multifunctional designs and enhanced performance

“…60,220,221 This approach utilizes external magnetic fields to align particles with anisotropic magnetic susceptibility suspended in a liquid matrix. 222,223 As 2D nanomaterials are often diamagnetic, extremely high magnetic fields are usually required for alignment. 222,224 To solve this problem, superparamagnetic nanoparticles such as iron oxide nanoparticles can be coated on the surface of the nanosheets to make them more responsive to magnetic fields.…”

“…After positioning the particles, the fluid is consolidated to fix the orientation, which can be achieved by solvent evaporation, light or temperature-controlled curing, depending on the solvent type. 42,223,226–228 To create complex local assemblies, virtual magnetic molds can be used. 319 These molds consist in placing a ferromagnetic material above a magnet.…”

Improvement of Thermoelectric Properties via Texturation Using a Magnetic Slip Casting Process–The Illustrative Case of CrSi2

“…However, the random nature of the Brownian motion may also interfere with the proper alignment of small particles. Indeed, the magnitude of the magnetic torque T m that rotates the individual particles upon application of a magnetic field B is given by the relation 42 :…”

“…Here, an efficient texturation process is proposed which consists in slip casting a dispersion of CrSi 2 particles under a strong magnetic field (12 T). This process takes advantage of the diamagnetic anisotropy of the materials to align the freely moving particles in suspension along their easy magnetization axis 42 . In addition, slip casting processes make possible the fabrication of large scale near net-shape parts which is of uttermost importance for efficient industrialization.…”