A process of producing low thermal expansion lithium aluminosilicate ceramics

Process for preparing low thermal expansion ceramics in lithium alumino-silicate system is disclosed. The process includes the preparation of an intermediate product in the hydroxy-hydrogel form which is in a reactive state. The process involves incorporation of nucleating materials such as zirconia in the composition which increases the product quality and reduces overall sintering temperature. The coefficient of thermal expansion of the material is -48 to 27.8 × 10 -7 /°C measured at temperature from room temperature to 800°C. The sintered product is used in the area of electronic devices, heat engine components, spark plug or as hot plate tops, domestic cooking ware and other engineering and technological applications where zero to a moderate thermal expansion coefficients and higher mechanical strength are required.