The Structural and Mechanical Properties of Al 2 O 3 -Ni Composites Obtained by Magnetic Field-Assisted Centrifugal Slip Casting.

This study investigates the influence of a magnetic field on the microstructure and properties of Al 2 O 3 -Ni composites fabricated via centrifugal slip casting at 1500 rpm. Al 2 O 3 and Ni powders were combined with water and deflocculants, homogenized, and then cast into a porous plaster mold surrounded by Nd-Fe-B magnets. The resulting composites, sintered in a reducing atmosphere, exhibited a three-zone structure with varying Ni content due to the combined effects of the magnetic field and centrifugal force. SEM, EDX, and XRD analyses confirmed the distribution and composition of the phases. Hardness tests revealed the highest values at the outermost zone, with a gradual decrease toward the inner zones. Compression tests employing digital image correlation revealed high internal stresses and a significant improvement in compressive strength compared to non-magnetic field methods. This study confirms that magnetic field-assisted centrifugal slip casting significantly enhances the structural, hardness, and compressive strength properties of Al 2 O 3 -Ni composites, indicating promising potential for advanced applications.