Patent ID: 6919289

Claim:
A method of making a ceramic body comprising: (a) forming a green body from an intimate mixture of vehicle, ceramic precursors and a eutectic composition wherein said eutectic composition has the following analysis by weight: 3% to 4% Li 2 O, 9.5% to 11.5% MgO, 50% to 60% SiO 2 , 16% to 18% Al 2 O 3 , 0% to 5% P 2 O 5 , 0% to 4% CaO, 2% to 6% Na 2 O, 0% to 8% MnO 2 , less than 1.5% Fe 2 O 3 and less than 3% other impurities; and (b) sintering said green body to produce a ceramic body.