| 摘要 |
Disclosed is sintered ceramic article that exhibits a primary crystalline phase of cordierite and analytical oxide composition, in weight percent, of 49-53 % SiO2, 33-38 % Al2O3, 12-16 % MgO and exhibits a coefficient of thermal expansion no greater than about 4.0x10<-7>/ DEG C over the temperature range of about 25 DEG C to about 800 DEG C and a transverse-I ratio of not less than about 0.92. Also disclosed is a method for producing a sintered cordierite ceramic article involving preparing a plasticizable raw material, comprising a magnesium source, a SiO2-forming source and an additional component of either: (a) a clay-free, Al2O3-forming source having a surface area of greater than about 5m<2>/g; or, (b) a clay and Al2O3-forming source combination wherein the clay comprises no greater than about 30 % by weight, of the total inorganic mixture, and the Al2O3-forming source exhibits a surface area of greater than about 40m<2>/g. The mixture is formed into a green body substrate of the desired configuration and subsequently dried and fired for a time and at temperature sufficient to form a structure having the aforementioned CTE and I-ratio properties. |
