Abstract
A strong magnetic field, e.g., >10 T, is considered an important tool in the process of small nonmetallic inclusions removal and related anisotropic materials preparation. In the present paper, a model system of aluminum containing alumina particles is used to investigate the strong magnetic field effects. Considerable segregation is induced by the applied gradient magnetic field, whereas no segregation is observed in a gravity field because of the convection. A high gradient magnetic field, together with the particle size and treatment time, is an important factor in generating the segregation. At the same time, magnetic alignment is detected after the strong magnetic field treatment. The (00l) crystal planes of alumina are found to be aligned to the strong magnetic field direction. Experimental results agree with the theoretical calculations based on the theory of magnetic energy. Additionally, the rotation time for the alignment is estimated and the time for alumina particles of 15 μm is found to be <1 s. However, the alignment is easily disturbed by the convection during the quenching outside of the strong magnet, especially for small particles where the rotation time is much shorter. The present results offer a better understanding of the strong magnetic field effects on the behavior of nonmagnetic particles in a conductive fluid.
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