Cordierite honeycomb ceramics and method producing the same

Details Cordierite honeycomb ceramics and method producing the same Cordierite honeycomb ceramics and method producing the same

1995-03-02

1996-10-22

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501112, 501153, 264 43, C04B 35195

Patent

active

055676634

ABSTRACT:
Cordierite honeycomb ceramics comprises a cordierite phase as a main ingredient. A value of [Fe.sub.2 O.sub.3 wt %/(MgO wt %+Fe.sub.2 O.sub.3 wt %)].times.100 is 2-10, where a ferric component is calculated as Fe.sub.2 O.sub.3. A thermal expansion coefficient of the cordierite honeycomb ceramics is less than 0.5.times.10.sup.-6 /.degree. C. within a temperature range of 40.degree.-800.degree. C. in a direction parallel to a flow passage of a honeycomb body. In the cordierite honeycomb ceramics including a ferric component, a ferric component is added from a talc as raw materials. The cordierite honeycomb ceramics having a low thermal expansion coefficient is obtained by mixing raw materials for cordierite generation to obtain a batch, extruding the batch into a honeycomb formed body, drying the honeycomb formed body, and firing the dried honeycomb formed body at a temperature range of 1350.degree.-1450.degree. C. After that, the sintered honeycomb body is immersed in an acid solution if necessary.

REFERENCES:
patent: 3885977 (1975-05-01), Lachman et al.
patent: 4476236 (1984-10-01), Inoguchi et al.
patent: 4598054 (1986-07-01), Mochida et al.
patent: 4722916 (1988-02-01), Watanabe et al.
patent: 5409870 (1995-04-01), Locker et al.
Definition of Talc, Mineralogy, (1959) pp. 507-508.

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