Enhancement of sintering ability of magnesium aluminate spinel (MgAl2O4) ceramic nanopowders by shock compression

The properties of MgAl2O4 nanopowders under shock pressure up to 5.3 GPa were investigated. It was found that the lattice constants and residual stresses of shock treated MgAl2O4 nanopowders increase non-linearly with shock velocity. According to the transmission electron microscope (TEM) images, the grain size of nanopowder was found decreased significantly after shock compression. The smaller grain size and high residual stress could lead to high sintering activity, which could be extraordinarily useful to enhance the density of ceramic and make highly transparent ceramic.

The morphology of unshocked (left) and shocked (right) MgAl2O4 nanopowders were observed by the transmission electron microscope. The grain size of nanopowder was found decreased significantly after shock compression, which will be extraordinarily useful to enhance the density of ceramic and make highly transparent ceramic.Figure optionsDownload as PowerPoint slide