Patent ID: 7107793
Filing Date: 2006-09-19
Classification: C03C

Abstract:
1. A method for the manufacture of a lithium-aluminosilicate glass ceramic comprising at least 70 vol.-% of keatite mixed crystals, the method comprising the following steps: casting a lithium-aluminosilicate base glass comprising (in wt.-%):  into a mold; annealing the base glass for nucleation at a nucleation temperature of about 600 to 900° C.; annealing for keatite formation at a temperature of 800 to 1300° C., wherein the temperature and the duration of annealing for keatite formation is selected so as to yield a glass ceramic comprising at least 70 vol.-% of keatite mixed crystals and having a coefficient of thermal expansion between 1.5×10 cooling to room temperature.