Abstract
The factors that affect the uniformity of semidry press refractories were studied. Specimens were made from batches having either raw flint clay or calcined flint clay as the granular material. They were formed by uniaxial pressing in a steel mold or by hydrostatic pressing in a rubber mold. Refinements in the control of factors that affect reproducibility, including particle sizing, mixing, forming, drying, and heat‐treating, are discussed. Modulus of elasticity and strength in tension were obtained, and the average values, coefficients of variation, and strain variability within the specimen were the criteria of reproducibility. All specimens of this particular material developed pressure cracks after forming in a steel mold. Sound specimens having reasonable reproducibility were obtained by hydrostatic molding and strict control of other variables. Specimens made from calcined grog were the most reproducible.
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