Abstract
The paper presents the results of experimental studies of the arc discharge between the graphite electrodes in an argon atmosphere at a pressure of 0.1–100 kPa. The discharge was ignited after the destruction of a graphite bar heated by a fixed electric current and maintained for ~103 s at a temperature of ~3 kK. Evidence of the formation of liquid phase on the surface of the graphite electrodes at a temperature of ~3.2 kK is presented. Data on the saturated carbon vapor pressure are discussed. The pressure in the carbon triple point does not exceed ~0.1 kPa.
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ACKNOWLEDGMENTS
The authors are grateful to Academician V.E. Fortov for useful discussions of the work at the seminar of the Joint Institute for High Temperatures of the Russian Academy of Sciences. We are also grateful to G.E. Valliano, who took the electron microscope images of the electrodes.
Funding
The presented experiments were supported by the Russian Foundation for Basic Research, project no. 06-08-00056a.
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Polishchuk, V.P., Samoilov, I.S., Amirov, R.K. et al. Graphite Melting at “Low” Temperature. High Temp 58, 197–212 (2020). https://doi.org/10.1134/S0018151X20020157
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DOI: https://doi.org/10.1134/S0018151X20020157