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 1131261

Abstract of the Disclosure The present invention relates to low-expansion ceramics having a chemical composition of the ceramics consisting essentially of 2 to 20% by weight of magnesia (MgO), 10 to 68% by weight of alumina (A?2O3), and 30 to 80% by weight of titanium in terms of titanium oxide (TiO2), wherein the major component of crystalline phase thereof is magnesium-aluminum-titanate phase, and the ceramics have 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, wherein the magnesium-aluminum-titanate phase as the maor component of the crystalline phase thereof is given by a chemical formula Mg10xA?8yTi5(l-x-y)O(10 +2y)' 0.02<x<0.20, 0.10<y<0.68, and 0.20<(x+y)<0.70, and a method of producing low-expansion ceramics, said method comprising steps of preparing a batch of compounds so as to provide a chemical composition of 2 to 20% by weight of magnesia, 10 to 68% by weight of alumina, and 30 to 80% by weight of titanium in terms of titanium oxide (TiO2); plasticizing the batch if necessary and shaping the batch by a means selected from the group consisting of extrusion, pressing, slip casting, and injection molding; drying the body thus formed; and firing the shaped body at 1,300°C to 1,700°C for 0.5 to 48 hours, whereby ceramics have a magnesium-aluminum-titanate phase as main component of crystalline phase thereof, 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. The ceramics of the invention can be widely used as ceramics material in the fields where high degree of heat-resistance, thermal shock-resistance, wear-resistance and corrosion-resistance are required.

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