The influence of the metallic phase on the microstructure and properties of Al2O3/Ti/Ni composites, taking into account environmental influences related to their production

Abstract

The performed tests showed that obtaining a finished product from the Al2O3/Ti/Ni system in the shape of a sleeve is possible using the Centrifugal Slip Casting method. A gradient arrangement of the metallic phase characterized the produced samples. The content of the metallic phase did not influence the rheological properties. Research has shown that the density of composites decreases with the increase in the content of the metallic phase. Using an air atmosphere made producing a spinel phase (NiAl2O4) in molded composites possible. The increase in the content of the metallic phase in the slip used to form composites limits the growth of Al2O3 grains. The cross-sectional hardness test confirmed the gradient microstructure of the composites for both series. The life cycle analysis results indicate that the increase in the share of the Ti and Ni phases leads to an increase in the environmental footprint of the materials produced concerning acquiring and processing raw materials.