Elaboration and mechanical properties of monolithic and multilayer mullite-alumina based composites devoted to ballistic applications

Both monolithic and multilayer mullite-alumina ceramic composites dedicated to ballistic applications were produced by uni-axial pressing tape casting before being sintered at 1510 °C. The compositions combining andalusite kaolin in addition α-alumina exhibit the more promising mechanical properties, reaching performances of pure alumina. However, for a given bulk density value, significant improvement (Young's modulus impedance) only varying composition monoliths is limited. second approach reported this work has consisted development judicious materials based on generation internal residual stresses thinner layers. Compared materials, most efficient configurations failure stress improved +35% fracture energy increased +60%. Indeed, layers subjected compressive promote crack bifurcation during rupture.