Low-expansion ceramics and method of producing the same

Details Low-expansion ceramics and method of producing the same Low-expansion ceramics and method of producing the same

C - Chemistry, Metallurgy

04

B

261/26

C04B 35/04 (2006.01) C04B 35/195 (2006.01) C04B 35/478 (2006.01)

Patent

CA 1135727

Abstract of the Disclosure The present invention relates to low-expansion ceramics, characterized in that chemical composition of the ceramics consists of 1.2 to 20% by weight of magnesia (MgO), 6.5 to 68% by weight of alumina (A?2O3 ), 19 to 80% by weight of titanium in terms of titanium oxide (TiO2), 1 to 20% by weight of silica (SiO2), and 0.5 to 20% by weight of iron in terms of ferric oxide (Fe2O3); that major component of crystalline phase thereof is a solid solution of magnesium oxide-aluminum oxide-titanium dioxide-silicon oxide-iron oxide; and that the ceramics has a coefficient of thermal expansion of not more than 20x10-7 (l/°C) in a temperature range of 25°C to 800°C, a four-point flexural strength of not smaller than 50 kg/cm2 at room temperature, and a melting point of not lower than 1,500°C, and a method of producing low-expansion ceramics comprising the steps of preparing a batch of compounds so as to provide a chemical composition of 1.2 to 20% by weight of magnesia (MgO), 6.5 to 68% by weight of alumina (A?2O3), 19 to 80% by weight of titanium in terms of titanium oxide (TiO2), 1 to 20% by weight of silica (SiO2), and 0.5 to 20% by weight of iron in terms of ferric oxide (Fe2O3); plasticizing the batch if necessary and shaping the batch; drying the body thus shaped; and firing the shaped body at 1,300°C to 1,700°C, thereby having a coefficient of thermal expansion of not more than 20x10-7 (l/°C) in a temperature range of 25°C to 800°C, a four-point flexural strength of not smaller than 50 kg/cm2 at room temperature, and a melting point of not lower than 1,500°C, wherein the shape of ceramics is a honeycomb structure.

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