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

1980-05-22

1981-12-22

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

501126, 501127, 501132, 501135, 501153, C04B 3504

Patent

active

043069096

ABSTRACT:
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 (Al.sub.2 O.sub.3), 24 to 80% by weight of titanium in terms of titanium oxide (TiO.sub.2), and 0.5 to 20% by weight of iron in terms of ferric oxide (Fe.sub.2 O.sub.3), 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 20.times.10.sup.-7 (1/.degree. C.) in a temperature range of 25.degree. C. to 800.degree. C. and a melting point of not lower than 1,500.degree. C., said coefficient of thermal expansion being maintained even after exposure 1,100.degree. 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 (Al.sub.2 O.sub.3), 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 (Fe.sub.2 O.sub.3); plasticizing the batch if necessary and shaping the batch; drying the body thus formed and firing the formed body at 1,300.degree. C. to 1,700.degree. C. for 0.5 to 48 hours, thereby having a coefficient of thermal expansion of less than 20.times.10.sup.-7 (1/.degree. C.) in a temperature range of 25.degree. C. to 800.degree. C. and a melting point of not lower than 1,500.degree. C., said coefficient of thermal expansion being maintained even after exposure at 1,100.degree. C. for 1,000 hours, wherein the shape of ceramics is a honeycomb structure.

REFERENCES:
patent: 2776896 (1957-01-01), Harman et al.
patent: 3578471 (1971-05-01), Lachman
patent: 3625717 (1971-12-01), Grubba et al.
patent: 4017347 (1977-04-01), Cleveland

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