Porous cordierite compositions with improved thermal expansion c

Details Porous cordierite compositions with improved thermal expansion c Porous cordierite compositions with improved thermal expansion c

1990-03-02

1991-06-04

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501128, 501118, C04B 3518, C04B 3520

Patent

active

050213733

ABSTRACT:
Cordierite compositions having increased porosity and improved thermal expansion characteristics are disclosed. The cordierite compositions comprise from about 0.025 to about 1.5 percent by weight germanium dioxide and exhibit reduced CTE. The cordierite compositions are made by heating a mixture of kaolin, talc, alumina, kyanite and germanium dioxide to temperatures of between 1350.degree. and 1475.degree.C. The cordierite compositions are preferably made from a mixture which includes a calcined material, such as calcined talc, so that the mixture is more easily processed and the resulting cordierite compositions are more porous, and thus, more easily coated.

REFERENCES:
patent: 4385129 (1983-05-01), Inoguchi et al.
patent: 4403017 (1983-04-01), Bind
patent: 4435512 (1984-03-01), Ito et al.
patent: 4476236 (1984-10-01), Inoguchi et al.
patent: 4587067 (1986-05-01), Agrawal et al.
patent: 4631267 (1986-12-01), Lachman et al.
patent: 4631268 (1986-12-01), Lachman et al.
patent: 4631269 (1986-12-01), Lachman et al.
patent: 4637995 (1987-01-01), DeAngelis et al.
patent: 4657880 (1987-04-01), Lachman et al.
D. K. Agrawal; "Germanium-Modified Cordierite Ceramics with Low Thermal Expansion"; Journal of the American Ceramic Society; vol. 69, No. 12, Dec. 1986.

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