Method of manufacturing an injection molded refractory shape...

Details Method of manufacturing an injection molded refractory shape... Method of manufacturing an injection molded refractory shape...

C - Chemistry, Metallurgy

04

B

261/25

C04B 35/634 (2006.01) B22D 41/54 (2006.01) C04B 35/01 (2006.01) C04B 35/101 (2006.01)

Patent

CA 1227504

Abstract of the Disclosure An alumina-carbon shape is manufactured from a com- position comprising 1 - 8 weight percent fine silicon, 1 - 16 weight percent reactive alumina, 1 - 30 weight percent calcined fluidized bed coke, 1 - 30 weight percent of a spalling inhibiting additive, and the balance of the mix synthetic alumina, plus the additions of 5 - 10 weight per- cent of a high carbon yielding resin as a molding vehicle and 0.5 - 4 weight percent solvent, and up to 2 weight per- cent of a low temperature curing agent, such as, paraformal- dehyde or hydrochloric acid. The mix is formed at ambient temperature into a shape through an injection molding pro- cess. Solidification is accomplished by curing in the mold at a temperature less than 100°C. After stripping the shape from the mold, the solvents are removed from the shape by drying at a temperature above 100°C. The shapes are then heated to a temperature above 550°C to coke the resin. The shapes may be tar impregnated to decrease coked porosity and to increase their resistance to mold powder.

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