Symposium on Extraction and Processing Division held at the TMS 2009 Annual Meeting and Exhibition, Date: 2009/02/15 - 2009/02/19, Location: San Francisco, CA, US
Proc. EPD Congress 2009
Author:
Keywords:
Science & Technology, Technology, Physical Sciences, Materials Science, Multidisciplinary, Metallurgy & Metallurgical Engineering, Materials Science, Characterization & Testing, Mineralogy, Materials Science, Strong magnetic field, Particle, Migration, Interaction, METAL
Abstract:
Magnetic fields have been used for inclusions removal from melt and preparation of materials with gradient compositions. Fundamental in these applications is that the induced magnetic forces on the particles/melt can enhance migration and change the interaction behavior. In the present paper, migration and interaction behavior of electrical-insulating particles in a conductive melt under strong magnetic field are theoretically analyzed. It is found that the migration can be considerably enhanced for micrometer sized particles by applying a strong magnetic field. In addition, two forces are involved in the interaction between two particles: the interparticle magnetic dipole-dipole attractive force due to magnetization and the repulsive force induced by flow of the melt. This theoretical analysis renders a better understanding of recent experimental results. Additionally, a new method by using strong magnetic field can be proposed to control the particle size distribution for the preparation of metal-matrix composites.