Magneco/metrel, Inc.

George M Connors

Madjid Soofi

Shirish Shah

A slurry composition for a mold and method of use thereof. The slurry composition includes about 45-80% by weight alumina, about 10-30% by weight silicon carbide, and about 10-50% by weight colloidal silica. In one aspect, the alumina component comprises a material selected from the group consisting of brown fused alumina, white fused alumina, tabular alumina, calcined alumina, and mixtures thereof. In another aspect, the composition includes fumed silica at 2-5% by weight. The composition may also include a setting agent at 0.05-2% by weight.

Molding composition and method of use

A ladle port assembly having a longer use life than a conventional porous plug includes an inner refractory member constructed from a high-fired alumina-containing refractory material, a middle refractory member surrounding the inner member and also constructed from a high-fired alumina-containing refractory material, a plurality of channel openings at an interface between the inner and middle refractory members, an outer refractory member surrounding the middle member, and a steel housing which contains the three refractory members. The high-firing of the inner and middle members increases their durability and hardness, reduces wear during use, and reduces the clogging of the channel openings which, in conventional porous plugs, has been caused by erosion and other forms of wear.

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Chicago, IL, United States of America

George M Connors