Properties dependence of castable samples from low-cement silicon carbide castable on the firing temperature and the gas atmosphere

  • P. O. Kushchenko JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
  • V. V. Primachenko JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
  • I. G. Shulyk JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
  • L. K. Savina JSC “URIR named after A. S. Berezhnoy”, Kharkiv, Ukraine
Keywords: low-cement silicon carbide castable, combined additive, firing temperature, air and reducing atmosphere, oxidation

Abstract

The influence of firing temperature of 1000, 1100, 1200, 1300, 1400, 1580 °C and atmosphere (air and reducing) on the main properties of castable samples from low-cement silicon carbide castable grade of “NKBS” with a combined additive has been investigated.

It was shown that, in air with an increase in the firing temperature in the range 1000—1580 °C, the content of silicon carbide in the castable samples decreases. Up to temperatures of 1200—1300 °C, the content of silicon carbide in the castable samples practically does not change, and oxidation slows down due to the formation of a viscous melt of a glassy phase of an alumina silicate composition on the surface of silicon carbide grains. An increase in the firing temperature above 1300 °C leads to a more intense oxidation of silicon carbide grains to SiO2, which causes a change in the porosity, density and strength of the samples. As a result of the carried out studies, it was found that, the using temperature in the air of the above mentioned low-cement silicon carbide castable should not exceed 1300 °C.

It was found that, after firing in a reducing atmosphere in the temperature range of 1000—1580 °C in the samples of silicon carbide castable, the content of silicon carbide remains almost the same, and the density and strength increase, which ensures the efficiency of its use for lining thermal units operating in a reducing atmosphere up to temperatures of 1580 °C.

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Published
2021-12-30
How to Cite
Kushchenko, P. O., Primachenko, V. V., Shulyk, I. G., & Savina , L. K. (2021). Properties dependence of castable samples from low-cement silicon carbide castable on the firing temperature and the gas atmosphere. Scientific Research on Refractories and Technical Ceramics, 121, 76-85. https://doi.org/10.35857/2663-3566.121.08

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