Patent ID: 8338318

Claim:
Antiballistic armor comprising: a transparent glass-ceramic component, the glass-ceramic component comprising 50 to 70 weight percent SiO 2 , 15 to 25 weight percent Al 2 O 3 , 0.5 to 5 weight percent ZrO 2 , 0.1 to 10 weight percent Li 2 O, and 1 to 5 weight percent TiO 2 , wherein the transparent glass ceramic component has a main crystalline phase that comprises keatite mixed crystal having a composition of LiAlSi x O y , wherein x is in a range of 2 to 4 and y is in a range of 6 to 10, and wherein the transparent glass ceramic component has a mean crystallite size of less than 0.1 micrometers.