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

1982-02-23

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

252477R, 501119, 501120, 501121, 501122, 501135, 501128, 501153, 501154, C04B 3504, C04B 3518, C04B 3544, C04B 3546

Patent

active

043169651

ABSTRACT:
The invention relates to low-expansion ceramics, the chemical composition of which consists of 1.2 to 20% by weight of magnesia (MgO), 6.5 to 68% by weight of alumina (Al.sub.2 O.sub.3), 19 to 80% by weight of titanium in terms of titanium oxide (TiO.sub.2), 1 to 20% by weight of silica (SiO.sub.2), and 0.5 to 20% by weight of iron in terms of ferric oxide (Fe.sub.2 O.sub.3); the major component of crystalline phase thereof is a solid solution of magnesium oxide-aluminum oxide-titanium dioxide-silicon oxide-iron oxide; the ceramics have 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., a four-point flexural strength of not smaller than 50 kg/cm.sup.2 at room temperature, and a melting point of not lower than 1,500.degree. C.; and a method of producing low-expansion ceramics comprising the steps of preparing a batch, plasticizing the batch, if necessary, and shaping the batch; drying the body thus shaped; and firing the shaped body at 1,300.degree. C. to 1,700.degree. C., thereby producing ceramics having 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., a four-point flexural strength of not smaller than 50 kg/cm.sup.2 at room temperature, and a melting point of not lower than 1,500.degree. C., and 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
patent: 4277539 (1981-07-01), Keller et al.

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