Moldings composed of cordierite and a process for producing them

Details Moldings composed of cordierite and a process for producing them Moldings composed of cordierite and a process for producing them

1989-03-10

1991-10-29

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501120, C04B 3564

Patent

active

050614215

ABSTRACT:
For producing moldings composed of cordierite, a batch, which gives the composition of cordierite and contains clay and/or kaolin as well as soapstone and/or talc and also water and an organic aid, is subjected to shear mixing. For this purpose, the batch is placed between 2 bodies, which are at a small distance and move relative to one another, and at the same time the batch is subjected to a shear stress. Preferably, the batch is filled into the gap formed by 2 almost touching cylindrical shear rollers which rotate at different speeds or run in opposite directions. The batch is then deformed to give a molding, and the molding is fired until the cordierite phase is formed.
Cordierite bodies of very low coefficients of thermal expansion (for example at most 1.1.times.10.sup.-6 /.degree.C. in all three spatial directions) can be obtained.

REFERENCES:
patent: 3824196 (1974-07-01), Benbow et al.
patent: 3885977 (1975-05-01), Lachman et al.
patent: 4851376 (1989-07-01), Asami et al.

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