Experimental Study on Compatibility of C6F12O/CO2 Gas Mixture with Eco-friendly Insulating Medium and Copper

SF
₆
is listed as a greenhouse gas that limits emissions because of its high GWP. The use of eco-friendly SF
₆
alternative gas in the power industry is of great significance for environmental protection. C
₆
F
₁₂
O has excellent environmental performance and is a hot research direction of alternative gas. At present, most of the existing research is on the insulation performance and decomposition characteristics of C
₆
F
₁₂
O and its gas mixture. Few studies have involved the compatibility of C
₆
F
₁₂
O gas mixture. Therefore, this paper builds a compatibility experiment platform to study the compatibility of C
₆
F
₁₂
O/CO
₂
gas mixture and the conductive metal material copper (Cu) in the equipment at different temperatures, and characterizes the gas decomposition products and the morphology of the Cu surface by GCMS and SEM. Studies have shown that during the interconnection of the C
₆
F
₁₂
O/CO
₂
gas mixture and the metal Cu, the color of the copper surface changes from purple to golden yellow with the gradual increase of temperature, and then to bright purple and then brown. SEM shows that a large number of crystal particles are generated on the surface of metal Cu due to corrosion, and C
₆
F
₁₂
O and metal Cu will also decompose during the interaction process, generating primary decomposition products such as C
₃
F
₆
, C
₃
F
₆
O and C
₇
F
₁₄
. The results show that the compatibility between C
₆
F
₁₂
O gas and metallic Cu materials is poor at high temperature, and anticorrosion treatment should be carried out in engineering applications. The relevant research results have guiding significance for the engineering application and online monitoring of C
₆
F
₁₂
O gas mixture.