Superduty fireclay refractory brick and methods for its manufacture
AssigneeVGT Industriekeramik GmbH
InventorHans Petschauer
Life of this patent
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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.
Claims9
Superduty fireclay refractory brick with 33 to 43 percent by weight Al.sub.2 O.sub.3 and 1 to 3 percent by weight alkali oxide and the remainder comprised substantially of SiO.sub.2 for use as a large-format bottom block in a tin bath in furnaces for manufacturing flat glass according to the float technique, having a compressive strength of 35 to 65 N/mm.sup.2 the improvement comprising:
- the brick has an open porosity of approximately 20 to 25 percent by volume, a gas permeability of less than 3 nPm and a hydrogen diffusion of less than 150 mm H.sub.2 O.
A superduty fireclay refractory brick made of 33 to 43 percent by weight Al.sub.2 O.sub.3 and 1 to 3 percent by weight of alkali oxide and the remainder comprised substantially of SiO.sub.2 for use as a large-format bottom block in a tin bath in furnaces for manufacturing flat glass, having a compressive strength of 35 to 60 N/mm.sup.2, an elasticity of compression modulous of 3000 to 10,000 N/mm.sup.2, the improvement comprising:
- said brick having an open porosity of from 20 to 25 percent by volume, a gas permeability of less than 3 nPm and a hydrogen diffusion of less than 150 mm H.sub.2 O.
Dependencies are inferred from the claim text.