The work deals with the study of functionally graded Al₂O₃ – Ni composites characterization. Functionally graded materials (FGM) show promising hypothesized applications such as joints between different types of materials, thermoelectric converters, graded surface coatings, graded solid oxide fuel cells, thermal barrier materials.

    Al₂O₃ – Ni composites were prepared by slip casting method using powders of α-Al₂O₃ (of average particle diameter 0,4 μm and density of 3,93 g/cm³) and nickel (of average particle diameter 2,13 μm and density of 8,9 g/cm³). The gradient concentrations of Ni particles were obtained by gravity sedimentation of metal particles and by additional forcing the movement of Ni particles in magnetic field.

    The microstructures of composites were characterised by scanning electron microscopy (SEM). Observations confirmed gradient concentration of Ni particles. The hardness test revealed the distribution of hardness in function of Ni particles gradient.

Acknowledgement:

The paper were party supported by Faculty of Materials Science and Engineering Warsaw University of Technology (project No 504G/1090/6360/007) and Faculty of Chemistry Warsaw University of Technology (project No 504G/1020/0787

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