High strength cordierite ceramic

Details High strength cordierite ceramic High strength cordierite ceramic

C - Chemistry, Metallurgy

04

B

261/33

C04B 33/24 (2006.01)

Patent

CA 1133952

HIGH STRENGTH CORDIERITE CERAMIC Abstract A ceramic body having the oxide composition, SiO2 33 - 46 wt. % A1203 37 - 57 MgO 5.5 - 15 ZnO .4 - 1.7 Na2O + K2O 1.0 - 3.0 ZrO2 0 - 5 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.

370540

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