Inventors:
Dennis M. VerDow - Lancaster OH
Assignee:
Anchor Hocking Corporation - Lancaster OH
International Classification:
C04B 3324
Abstract:
A ceramic body having the oxide composition, SiO. sub. 2 : 33-46 wt. % Al. sub. 2 O. sub. 3 : 37-57 wt. % MgO: 5. 5-15 wt. % ZnO: 0. 4-1. 7 wt. % Na. sub. 2 O+K. sub. 2 O: 1. 0-3. 0 wt. % ZrO. sub. 2 : 0-5 wt. % The sum of these oxides (including ZrO. sub. 2, if present) should preferably be at least 97% of the total. The remainder of the composition may comprise those ingredients such as CaO, Fe. sub. 2 O. sub. 3 and/or TiO. sub. 2, which are normally present in conventional ceramic batch raw materials. Essentially no Li. sub. 2 O should be present. The fired body, in which cordierite is the perdominant crystal phase, has a modulus of rupture greater than 10,000 psi and often higher than 14,000 psi, and is suitable for freezer-to-oven utensils and for dinnerware. It is glazable with a wide range of glazes including non-Li. sub. 2 O containing glazes.