Field‐Assisted Sintering of Nb–Al ₂ O ₃ Composite Materials and Investigation of Electrical Conductivity

Field-assisted sintering technique (FAST) is used for the preparation of Nb–Al2O3 composite materials. The electrical conductivity investigated depending on particle size starting powders and under varying volume contents refractory metal in powder mixture. percolation threshold found to be influenced not only by fraction but also alumina sample preparation. For fine- coarse-grained alumina, a 17.5 10 vol% Nb estimated, respectively. Furthermore, microstructure gain basic understanding dependency between microstructural features resulting material properties macroscopic scale. Also, influence process microstructure–properties relationship considered. It could shown that are anisotropic because anisotropy effects caused FAST process.