Gradient composites Al2O3-Ni obtained via the CSC technique in a magnetic field - microstructure and mechanical properties

This article presents the formation of composite microstructures by combining two established concepts: centrifugal slip casting and the utilization of a magnetic field to control the distribution of magnetic particles. The integration of these methodologies offers the potential to create zones within the composite with distinct hardness values. The study introduces a novel method for fabricating ceramic-metal composites, with a key focus on determining the feasibility of manipulating the location of the metallic phase using a magnetic field. Through this innovative approach, the research aims to produce composite hollow cylinders with a gradient distribution of metallic particles. The relative density of the composites was 97 %. The hardness values for the samples range from 970 HV to 2700 HV, displaying variability based on the metallic phase content within the material. The compressive strength for Al 2 O 3 -Ni samples was equal to 128.92 MPa. The Al 2 O 3 grains in zone III after the sintering process have an average size of 1.27 ± 0.68 µm. The Al 2 O 3 -Ni composites indicate a smaller heat capacity of the material compared to pure Al 2 O 3 samples. • Gradient composite obtained by centrifugal slip casting with a magnetic field. • FGM composites. • Mechanical properties of Al2O3-Ni.