Predominant Particles in SF₆-CO₂ Mixture at Temperatures of 300-30,000K

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  • Predominant Particles in SF<sub>6</sub>-CO<sub>2</sub> Mixture at Temperatures of 300-30,000K

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Regarding SF6-CO2 mixture gases, the equilibrium compositions in a temperature range from 300 to 30,000K at 0.6MPa were calculated to find out predominant particles with high number densities. Eighty-five particles, including 47 neutral molecules originating from SF6 and CO2, were taken into account as the component species. At the temperatures T of about 7,000K or above, S, F, C, O, their positive ions and electrons are present as the predominant particles, for almost all of the CO2 concentration, XCO2 . Not only SF, SF2, CO and CO2 but also SO and SO2 behave as the predominant particles in the temperature range from 3,000 to 7,000K, almost independent of XCO2. On the contrary, the predominant particles in the temperature range from 300 to 3,000K distinctly depend on XCO2. By way of example, for the gas of XCO2=0.1, three particles SF6, SO2F2 and CF4 have the high number densities at T below 1,000K. By way of another example, particles CO2, SO2F2, CF4 and CO2F2, for XCO2=0.6, shows the high number densities at T below 1,000K. On the basis of these results, the predominant particles present after an arc extinction are discussed as a function of XCO2.

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