| 摘要 |
A ceramic body having the oxide composition, SiO2: 33-46 wt. % Al2O3: 37-57 wt. % MgO: 5.5-15 wt. % ZnO: 0.4-1.7 wt. % Na2O+K2O: 1.0-3.0 wt. % ZrO2: 0-5 wt. % The sum of these oxides (including ZrO2, if present) should preferably be at least 97% of the total. The remainder of the composition may comprise those ingredients such as CaO, Fe2O3 and/or TiO2, which are normally present in conventional ceramic batch raw materials. Essentially no Li2O 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-Li2O containing glazes. The composition from which the ceramic is made has a firing tolerance which is unusually wide for a cordierite ceramic.
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