Refractories

, Volume 8, Issue 11–12, pp 745–751 | Cite as

Firing silicon carbide refractories in a nitrogen atmosphere

  • N. I. Voronin
  • N. I. Krasotkina
  • M. S. Fraifel'd
Research
  • 32 Downloads

Conclusions

During the firing of specimens of silicon carbide and silicon in a nitrogen atmosphere at 1200–1400°C, the silicon is converted almost completely to silicon nitride. The content of impurities of SiO2 and Si varies from 1.7 to 1%, and from 2.8 to 0.5% respectively.

The compressive strength of the specimens, depending on the firing temperature, is 2500−1750 kg/cm2, the porosity 17–18%, and the solubility in cryolite-alumina melt 10.0−2.5μ/h.

The minimum firing temperature of the specimens is 1200°C, and the soaking time at this temperature should not be less than 6 h. The maximum firing temperature is 1400°C with a 3-h soak.

Silicon carbide refractories for the linings of aluminum electrolyzers need to be fired with a staged cycle, with soaking periods at 1200 and 1400°C.

Keywords

Nitrogen Aluminum Silicon Atmosphere Porosity 

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Literature cited

  1. 1.
    I. S. Brokhin and B. F. Funke, Ogneupory, No. 12, 562 (1957).Google Scholar
  2. 2.
    D. Mirew and I. Schopow, Chem. Techn.,12, No. 12, 714 (1960).Google Scholar

Copyright information

© Consultants Bureau 1968

Authors and Affiliations

  • N. I. Voronin
    • 1
  • N. I. Krasotkina
    • 1
  • M. S. Fraifel'd
    • 1
  1. 1.All-Union Institute of RefractoriesUSSR

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