Antiballistic armour plate includes a ceramic body including a hard material, provided, on its inner face, with a back energy-dissipating coating. The ceramic body is monolithic. The constituent material of the ceramic body includes grains of ceramic material having a Vickers hardness that is higher than 15 GPa, and a matrix binding the grains, the matrix including a silicon nitride phase and/or a silicon oxynitride phase, the matrix representing between 5 and 40% by weight of the constituent material of the ceramic body. The maximum equivalent diameter of the grains of ceramic material is smaller than or equal to 800 micrometres. The constituent material of the ceramic body has an open porosity that is higher than 5% and lower than 14%. The metallic silicon content in the material, expressed per mm of thickness of the body, is lower than 0.5% by weight.

The present disclosure relates to an anti-breaking element comprising a geopolymer, a process for preparing an anti-breaking element, the process comprising: a) providing the skeleton of an anti-breaking element; b) preparing a geopolymer formulation; c) casting the geopolymer formulation of step b) into the skeleton of the anti-breaking element of step a); and d) optionally, removing the skeleton. The present disclosure further relates to the use of a geopolymer as part of an anti-breaking element.