Monothilic refractory composition

Details Monothilic refractory composition Monothilic refractory composition

2007-01-23

2007-01-23

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C501S124000, C501S125000

Reexamination Certificate

active

10483070

ABSTRACT:
A subject for the invention is to provide an unshaped refractory composition having not only high thermal resistance but also improved corrosion resistance and improved unsusceptibility to slag infiltration.The invention is “an unshaped refractory composition comprising: (1) 20 to 70% by weight raw spinel material comprising an MgO—Al2O3spinel phase and containing 2 to 20% by weight magnesia and/or raw spinel/corundum material comprising an MgO—Al2O3spinel phase and a corundum phase and containing 2 to 20% by weight magnesia; (2) 3 to 12% by weight raw magnesia material having a particle diameter of 0.3 mm or smaller, containing particle sizes of 75 μm or smaller in an amount of 55 to 85% by weight, and having a magnesia purity of 90% by weight or higher; (3) 3 to 10% by weight alumina cement having a calcia content lower than 20% by weight; (4) 0.3 to 1.5% by weight ultrafine powder consisting mainly of silica; and (5) a raw alumina material as the remainder”.

REFERENCES:
patent: 4244745 (1981-01-01), Havranek et al.
patent: 5283215 (1994-02-01), Hosokawa et al.
patent: 6274525 (2001-08-01), Zborowski et al.
patent: 6-172044 (1994-06-01), None
patent: 6-345550 (1994-12-01), None
patent: 11-310471 (1999-11-01), None

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