Investigation of high-temperature corrosion of graphite with SiC coating

Authors

  • I.E. Kenzhina IETP, Al Farabi Kazakh National University, Kazakhstan, Almaty
  • Ye.V. Chikhray IETP, Al Farabi Kazakh National University, Kazakhstan, Almaty
  • V.P. Shestakov IETP, Al Farabi Kazakh National University, Kazakhstan, Almaty
  • T.V. Kulsartov IETP, Al Farabi Kazakh National University, Kazakhstan, Almaty
  • S.K. Askerbekov IETP, Al Farabi Kazakh National University, Kazakhstan, Almaty
  • O.A. Kalikulov IETP, Al Farabi Kazakh National University, Kazakhstan, Almaty
  • T.K. Zholdybayev Institute of Nuclear Physics, Almaty, Kazakhstan

Keywords:

corrosion, graphite, SiC coatings, HTGR reactor, reaction rate

Abstract

The article describes the results of experiments on high-temperature corrosion of graphite with SiC coating. To ensure the safe operation of a high-temperature gas-cooled reactor (HTGR), it is necessary to investigate the behavior of fuel and graphite elements of its core in case of air and/or water ingress. Nowadays, the data on corrosion of numerous types of reactor graphites in oxygen, air and in water vapor is insufficient. In this work, experiments were conducted on high-temperature corrosion of IG-110 graphite (without and with SiC-coating) samples and the temperature dependences of kinetics of gas composition change in corrosion chamber with samples of graphite in temperature range from 750°C to 1400°C and at initial pressures of water vapor in the chamber 10-100 Pa were obatined. There is a significant difference in the rate of pressure change in corrosion chamber for various gases in experiments with graphite without coating at a fixed temperature. This fact states about different values of reaction rates and a complex mechanism of corrosion, which depends on processes having different constants. A qualitative analysis of the results of corrosion experiments was also carried out.

References

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References
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Published

2017-10-10

Issue

Vol. 61 No. 2 (2017): Recent Contributions to Physics

Section

Condensed Matter Physics and Materials Science Problems. NanoScience