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Strength after heating of unfired refractories containing chemical bonding agents

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Refractories Aims and scope

Conclusions

Out of all the experimental bonding agents used in the production of unfired magnesite and magnesite-chromite refractories: SDW; MgSO4,· 7H2O; MgSO4·7H2O + H3BO3; (NaPO3)n, the greatest strength on heating is provided by the addition of 2% (NaPO3)n.

An addition of boric acid to the refractories using the MgSO4,·7H2O bonding agent helps to strengthen the refractories in the 500–900°C interval; at a higher temperature the refractories with the magnesium sulfate plus boric acid bonding have no advantages in their strength properties over the articles with the magnesium sulfate bonding agent only.

The magnesite-chromite articles with the chemical bonding agent have better strength in the 1000–1400°C interval than the magnesite articles. This is explained by the spinelformation reactions which occur at these temperatures.

On the basis of these studies (NaPO3)n and also MgSO4,· 7H2O with an addition of H3BO3 can be recommended as chemical bonding agents for unfired magnesite-chromite refractories.

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Literature cited

  1. A. A. Dobrokhotov, Steel-Smelting Production [in Russian], Moscow (1959).

  2. N. A. Shaposhnikov, Mechanical Testing of Metals [in Russian], Moscow-Leningrad (1954).

  3. D. Alvarez-Estrada and S. Aza Fendas, Ber. Deutsch, Keram. Ges.,43, No. 1 (1966).

  4. H. Riehardson, M. Bester, and F. T. Palin, Trans. Brit. Ceram. Soc.,68, No. 1 (1969).

  5. S. L. Golynko-Vol'fson, M. M. Sychev, A. G. Sudakas, et al., in: The Chemical Basis of the Technology and Use of Phosphate Bondings and Coatings [in Russian], Leningrad (1968).

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Authors and Affiliations

  1. Ukrainian Scientific-Research Institute of Refractories, USSR

    E. G. P'yanykh, G. I. Antonov & L. M. Yakobshuk

Authors
  1. E. G. P'yanykh
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  2. G. I. Antonov
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  3. L. M. Yakobshuk
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Translated from Ogneupory, No. 1, pp. 48–52, January, 1979.

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P'yanykh, E.G., Antonov, G.I. & Yakobshuk, L.M. Strength after heating of unfired refractories containing chemical bonding agents. Refractories 20, 48–52 (1979). https://doi.org/10.1007/BF01281923

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  • DOI: https://doi.org/10.1007/BF01281923

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