Dresser Industries, Inc.

Harbison-Walker Refractories Company

Peter T Sutor

Edward L Erny

Leigh F Brooks

A pulverulent fiber-reinforced spray mix is disclosed in which about 0.02 to 0.3 wt. % of flexible, thermoset polymer fibers resistant to decomposition at a temperature up to about 400.degree. F. are added for each 100 wt. % of other solids in the mix to form a mix which both avoids formation of mat-like structures in the dry hopper of refractory spray apparatus and provides a sprayed lining that is resistant to cracking and peeling during dry-out and preheat. The invention also comprises sprayable compositions formed by admixing water with the mix.

Fiber reinforced spray mix

A mix and a high alumina refractory shape with high resistance to aluminum penetration comprising aluminum oxide and at least about 1% by weight of boron phosphate.

High alumina refractory shapes

An improved ladle especially adapted for holding molten metals such as steel, the ladle having an interior brick lining a major part thereof which consists essentially of a composition of from about 70 to 95 weight percent of an aluminous material having a minimum alumina content of about 60 weight percent and the balance refractory clay; and for each 100 parts by weight of said composition, from about 5 to 20 weight percent of fine silicon carbide.

Prevention of slag buildup in steel ladles

A heat-insulating board comprising a molded refractory material having substantially uniformly distributed therethrough flexible thermoset polymer fibers resistant to decomposition at a temperature up to about 400.degree. F. in an amount sufficient to increase the fracture energy of said board, and compositions for making such board.

Heat-insulating boards

Lightweight refractory monolith forming batch comprising selected high alumina materials.

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Pittsburgh, PA, United States of America

Peter T Sutor