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Mechanism of trace moisture effect on thermal decomposition characteristics of C4F7N/CO2/O2 gas mixture
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Siqi SONG1, Jiagui TAO1, Heng ZHAO1, Jinwei ZHU1, Yitian CHU2, Feng XIAO2, Fanchao YE2, *
Insulating Materials | 2026, 59(3) : 60 - 67
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Insulating Materials | 2026, 59(3): 60-67
• Special Issue on Low-carbon Environmental Protection Advanced Insulation Materials •
Mechanism of trace moisture effect on thermal decomposition characteristics of C4F7N/CO2/O2 gas mixture
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Siqi SONG1, Jiagui TAO1, Heng ZHAO1, Jinwei ZHU1, Yitian CHU2, Feng XIAO2, Fanchao YE2, *
Affiliations
  • 1State Grid Jiangsu Electric Power Research Institute, Nanjing 211103, China
  • 2Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan 430068, China
Published: 2026-03-20 doi: 10.16790/j.cnki.1009-9239.im.2026.03.007
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The C4F7N/CO2/O2 ternary gas mixture exhibits excellent environmental friendliness and insulation performance, but there is still a lack of research on the stability of C4F7N/CO2/O2 under trace moisture conditions during long-term operation of equipment. In this study, thermal decomposition experiments of C4F7N/CO2/O2 were conducted at different trace moisture concentrations. At the same time, reactive molecular dynamics simulations based on the ReaxFF force field were employed to explore the influence of moisture on the thermal decomposition characteristics of C4F7N/CO2/O2 from a microscopic perspective, and the correlation mechanisms between decomposition products and trace moisture was analyzed. The results show that the main thermal decomposition products of the gas mixture are CF4, C3F8, C3F6, C2F6, and CHF3. The increase of trace moisture concentration promotes the decomposition of C4F7N, leading to an increase in the concentration of decomposition products. However, when the trace moisture concentration further increases, the reaction pathways for generating the main decomposition products are inhibited. This inhibition leads to a downward trend in the concentrations of the main decomposition products, and promotes the formation of more secondary by-products and complex components, causing a shift in the decomposition pathways of the system.

C4F7N/CO2/O2  /  trace moisture  /  thermal decomposition  /  eco-friendly insulation gas  /  molecular dynamics
Siqi SONG, Jiagui TAO, Heng ZHAO, Jinwei ZHU, Yitian CHU, Feng XIAO, Fanchao YE. Mechanism of trace moisture effect on thermal decomposition characteristics of C4F7N/CO2/O2 gas mixture[J]. Insulating Materials, 2026 , 59 (3) : 60 -67 . DOI: 10.16790/j.cnki.1009-9239.im.2026.03.007
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Year 2026 volume 59 Issue 3
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doi: 10.16790/j.cnki.1009-9239.im.2026.03.007
  • Receive Date：2025-04-27
  • Online Date：2026-09-10
  • Published：2026-03-20
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  • Received：2025-04-27
  • Revised：2025-06-25
Affiliations
    1State Grid Jiangsu Electric Power Research Institute, Nanjing 211103, China
    2Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment, Hubei University of Technology, Wuhan 430068, China
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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