Abstract
Syntheses of high-thermal-expansion ceramics from NaAlSiO4 were investigated. NaAlSiO4 has two crystal polymorphic forms; nepheline and carnegieite. Mean axial thermal expansion coefficients of nepheline and carnegieite were 16.9×10-6/°C (from room temperature to 800°C) and 15.2×10-6/°C (from room temperature to 600°C), respectively. High density ceramics of nepheline and carnegieite were fabricated from a carnegieite powder calcined from 1300°to 1350°C followed by sintering at 1250°C and at 1300°C, respectively. They had the bending strength of ca. 100MPa and linear thermal expansion coefficients of 16.4×10-6/°C and 15.0×10-6/°C, respectively.
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