Ceramic foam filters

Details Ceramic foam filters Ceramic foam filters

1991-09-20

1993-03-02

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Pore-forming

501 80, 501 89, 501128, 210506, 2105101, C04B 3806

Patent

active

051908972

ABSTRACT:
A ceramic foam filter, particularly for filtering molten iron, is formed from a composition comprising silicon carbide, alumina, silica derived from colloidal silica sol and alumino-silicate fibres, which has been fired at such a temperature that the filter has a ceramic matrix in which the alumino-silicate fibres are substantially dissolved. The filter is fired at a minimum of 1150.degree. C. and preferably within the range from 1200.degree. to 1300.degree. C. Preferably the filter is formed from an aqueous slurry having a solids content comprising by weight 20-50% silicon alumina, 20-50% alumina, 1.5-5.0% silica derived from colloidal silica sol and 1-3% alumino-silicate fibres.

REFERENCES:
patent: 4265659 (1981-05-01), Blome
patent: 4343704 (1982-08-01), Brockmeyer
patent: 4391918 (1983-07-01), Brockmeyer
patent: 4713180 (1987-12-01), Hofmann et al.
patent: 4746341 (1988-05-01), Komoda
patent: 4808558 (1989-02-01), Park et al.
patent: 4866011 (1989-09-01), Hargus et al.
patent: 4885263 (1989-12-01), Brockmeyer et al.

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