Superduty fireclay refractory brick and methods for its manufact

Details Superduty fireclay refractory brick and methods for its manufact Superduty fireclay refractory brick and methods for its manufact

1993-03-02

1995-04-18

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501130, 501133, C04B 3514, C04B 3544

Patent

active

054078750

ABSTRACT:
A superduty fireclay refractory brick with at least 33 to 43 per cent by weight Al.sub.2 O.sub.3 and 1 to 3 per cent by weight alkali oxide for use as a large-format bottom block in a solder plating bath in furnaces for manufacturing flat glass according to the float technique has a compressive strength of 35 to 60 N/mm.sup.2 and a gas permeability of less than 4 nPm. The brick possesses an open porosity of approx. 20 to 25 per cent by volume, a gas permeability of less than 3 nPm, preferably 0.5 to 2 nPm, and a hydrogen diffusion of less than 150 mm H.sub.2 O, preferably 30 to 100 mm H.sub.2 O.

REFERENCES:
patent: 3348597 (1967-10-01), Chaklader et al.
H. Leupold, K. Santowski, K. Wieland, "Improvement of Resistance to Alkali Attack of Refractory Materials . . . ", Nov. 1984.

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