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 35/10 (2006.01) C04B 35/478 (2006.01)

Patent

CA 1131262

Abstract of the Disclosure The present invention relates to low-expansion ceramics essentially consisting of 1.5 to 20% by weight of magnesia (MgO), 8 to 68% by weight of alumina (A?2O3), 24 to 80% by weight of titanium in terms of titanium oxide (TiO2), and 0.5 to 20% by weight of iron in terms of ferric oYide (Fe2O3), that major component of crystalline phase thereof is a solid solution of magnesium oxide- aluminum oxide-titanium dioxide-iron oxide, and that the ceramics has a coefficient of thermal expansion of not more than 20x10 7 (1/°C) in a temperature range of 25°C to 800°C and a melting point of not lower than 1,500°C, said coefficient of thermal expansion being maintained even after exposure 1,100°C for 1,000 hours, and a method of producing low-expansion ceramics comprising steps of preparing a batch of compounds so as to provide a chemical composition of 1.5 to 20% by weight of magnesia (MgO), 8 to 68% by weight of alumina (A?2O3), 24 to 80% by weight of titanium in terms of titanium oxide, and 0.5 to 20% by weight of iron in terms of ferric oxide (Fe2O3); plasti- cizing the batch if necessary and shaping the batch; drying the body thus formed and firing the formed body at 1,300°C to 1,700°C for 0.5 -to 48 hours, thereby having a coefficient of thermal expansion of less than 20x10-7 (1/°C) in a temperature range of 25°C to 800°C and a melting point of not lower than 1,500°C, said coefficient of thermal expansion being maintained even after exposure at 1,100°C for 1,000 hours, wherein the shape of ceramics is a honeycomb structure.

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