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Adding combustible liquids to fireclay bodies to regulate the structure and increase spalling resistance

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Refractories Aims and scope

Conclusions

A simple method has been discovered and investigated to control the structure of fireclay refractories with the aim of increasing their spalling resistance by creating microcracks on the surface of the grains of grog at the boundary with the bond.

The development of microcracks is attained by first coating the grains of grog with a hydrophobic organic liquid (before mixing grog with bond clay). This increases the spalling resistance of fireclay refractories made of plastic and semidry bodies 1.5–2.0 times.

When such additives are introduced into the bond part of the batch, the microcracks are situated, not around the grains, but in the main mass and are preferentially oriented parallel to each other. Under these conditions the spalling resistance of the material deteriorates.

A reduction in the magnitudes of a number of properties (linear thermal expansion, elasticity, strength, Poisson Ratio, and thermal conductivity) takes place with both methods of treating fireclay bodies with organic liquids (covering the grog-grains or adding it to the bond). This suggests the prevailing positive influence of the structural nature (microcracks at the surface of the grains of grog) on the spalling resistance of the firebrick refractories.

It is shown that with an increase in porosity of the fireclay refractories, their spalling resistance increases (to a given level) if the pores are localized chiefly at the surface of the grains of grog and bond; it is reduced when the pores are on the bonding mass of the refractory.

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Authors and Affiliations

  1. The Khar'kov V. I. Lenin Polytechnical Institute, USSR

    G. V. Kukolev & I. I. Nemets

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  1. G. V. Kukolev
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  2. I. I. Nemets
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Kukolev, G.V., Nemets, I.I. Adding combustible liquids to fireclay bodies to regulate the structure and increase spalling resistance. Refractories 4, 86–92 (1963). https://doi.org/10.1007/BF01283239

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  • DOI: https://doi.org/10.1007/BF01283239

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