Removal of SiC inclusions in molten aluminium using a 12 T static magnetic field

Abstract

The analysis of particles trajectories in a vertical cylindrical coil shows that the magnetization force acting on paramagnetic particles has predominantly axial component which aims upwards and opposite to the gravitational force. In case of superconducting coil and depending on the value of the particle susceptibility, the axial force component can exceed several times the force of gravity. As a result, a motion of the particles in vertical upward direction appears. This effect was utilized to realize a magnetic separator, the main advantage of which is the high effectivity of separation process. A NbTi SC coil generates the magnetization force with a flux density field up to 12 T. Experiments with SiC inclusions in molten Aluminium have been performed to confirm the feasibility of this segregation concept.

Non-stationary magnetized axially symmetric equilibrium from the fluid equations of motion

“…]. We consider this force an important effect neglected in the usual analysis of plasma equilibrium despite its experimental applications in fusion [ [23]], magnetic fluids [ [24,25,26]], biophysics [ [27,28,29,30,31]], and materials science [ [32,33,34,35,36,37,38,39,40,41,42,43]] and addressed for the case of a stationary equilibrium elsewhere [ [22]]. In the evaluation of Equations ( 10) and ( 11), we take F M ± ≡ F M i ± F M e where F M s = −µ 0 ∇M s H. There remains to incorporate any effects arising from the intrinsic spin of the particles, requiring a properly quantum mechanical treatment of plasma magnetization.…”

Stationary axial plasma equilibrium in light of the magnetic polarization force

“…The full effect of plasma magnetization remains poorly understood. From early explorations (Grad and Rubin, 1958;Rose and Clark, 1961;Shafranov, 1966;Roth, 1967;Vlasov, 1968;Hall, 1972) through modern developments (Hazeltine and Meiss, 2003;Hazeltine and Waelbroeck, 2004), we contend that an important effect has been neglected in the analysis of plasma equilibrium, the magnetic polarization force, despite its experimental applications in fusion (Hayes et al, 1985), magnetic fluids (Zahn and Pioch, 1999;Rinaldi and Zahn, 2002;El-Dib and Moatimid, 2002), biophysics (Qi et al, November 2001;Ataka and Wakayama, 2002;Wang and Wakayama, 2003;Tzirtzilakis, 2005;Ramachandrana and Leslieb 2005) and materials science (Cantor and O'Reilly, 2002;Colli et al, 2003;Takagi et al, 2003;Kozuka et al, 2003;Asai, 2004;Maki and Ataka, 2005;Ma et al, 2006;Ono et al, 2007;Keil, 2007;Jin et al, 2008). Its nonlinear nature is often cited when neglecting plasma magnetization in the usual introductory equilibrium equation (Chen, 1984;Dendy, 1993;Stacey, 2005), which treats the combined bound and free current densities as a single entity; however, we find that the reciprocal relationship between M and H leads to simplifications, rather than complications, in the treatment of stationary equilibrium in a strongly magnetized plasma.…”

Study on the as-cast microstructure and mechanical properties of 35CrMo steel based on electric field control

“…At present, the research hotspots controlling the microstructure and properties of the metal solidification process using an external field mainly focus on: (1) electric current control, (2) magnetic field control, (3) ultrasonic control, (4) microgravity field and high-pressure field control, etc. Among them, electric and magnetic field control technology has gradually attracted researchers' attention due to its low energy consumption, significant effect, convenient application, strong universality, and ability to ensure metal cleanliness [4][5][6][7].…”