| abstract |
An anti-ballistic armor plate comprising a ceramic body made of a hard material, with a rear energy-dissipating coating, on its inner face, preferably made of a material having a hardness lower than that of the constituent materials of the ceramic body: , having an area greater than 150 cm 2 , a thickness greater than 12 mm and a bulk density less than 3.5 g/cm 3 ; - the component material of the ceramic body comprises particles of a ceramic material having a Vickers hardness greater than 15 GPa and a matrix binding such particles, the matrix comprising or such a silicon nitride phase and/or a silicon oxynitride phase wherein the matrix represents 5 to 40% by weight of the component material of the ceramic body; - the maximum equivalent diameter of the particles of the ceramic material is 800 micrometers or less; - the component material of the ceramic body has an open porosity of greater than 5% and less than 14%; It is characterized in that the metallic silicon content in the material, expressed per mm of the thickness of the body, is less than 0.5% by weight. |