Abstract
Abstract The thermal and electrical properties of alkoxy-derived cordierite ceramics are estimated. These properties are discussed in relation to the homogeneity and purity of the ceramics. The cordierite ceramics were prepared by sintering fine and homogeneous precursor powders. Previous papers demonstrate the high purity and homogeneity of the precursor powders and therefore, the cordierite ceramics should have the superior properties. It was found that the properties of the alkoxy-derived cordierite changed remarkably with sintering temperature or the crystalline phases. Because of residual stress and micro-cracking, the cordierite ceramics cannot have high flexural strength. However, the cordierite ceramics sintered at 1300°C had some superior properties, such as high thermal shock resistance (critical temperature difference of about 600°C), low thermal expansion and high electrical resistivity. This behavior is ascribed to the high purity and homogeneity of the resulting ceramics.
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