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The physical properties and characteristics of unburned alumina‐carbon refractories with added spherical alumina particles were investigated. The strength of the refractories was decreased whereas the packing density, erosion resistance and thermal shock resistance were improved by the addition of the spherical alumina particles. Based on these results, the lower nozzle of the sliding nozzle for continuous casting has been made of alumina‐carbon refractories with added spherical alumina particles. The lower nozzle has shown uniform structure and reduced incidence of crack formation caused by thermal stress arising during casting. Accordingly, the durability of the lower nozzle has been considerably increased.
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NAMEISHI et al. (1986) studied this question.
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