Aging Characteristics and Lifespan Assessment Methods of ETFE Insulated Wires Based on Thermogravimetric Analysis

ZHANG Fan; WANG Xiaojia; CHEN Yu; BIAN Zhi

doi:10.7643/ issn.1672-9242.2025.11.006

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (11) : 59-66. DOI: 10.7643/ issn.1672-9242.2025.11.006

Aviation and Aerospace Equipment

Aging Characteristics and Lifespan Assessment Methods of ETFE Insulated Wires Based on Thermogravimetric Analysis

ZHANG Fan, WANG Xiaojia^*, CHEN Yu, BIAN Zhi

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Abstract

Based on the thermogravimetric analysis method, the work aims to systematically investigate the thermal degradation laws of ETFE insulated wires for tin-plated and silver-plated copper alloy conductors. By combining the time-temperature equivalence principle and the Arrhenius equation, an accelerated aging model for ETFE insulated wires was constructed. A method for verifying and evaluating the aging lifespan of ETFE insulated wires was proposed, and an accelerated aging test was designed to verify the reliability of the product lifespan assessment. The thermogravimetric analysis results showed that the thermal weight loss process of ETFE insulated materials could be divided into three stages of low-temperature volatilization, high-temperature decomposition, and residual stability. Due to the thermal conduction lag effect, the increase in the heating rate significantly delayed the thermal degradation temperature. The thermal stability difference between silver-plated and tin-plated conductors was relatively small.By using the constructed aging lifespan assessment method for ETFE insulated wires, the equivalent relationship between the accelerated aging lifespan at 60 ℃ and the aging lifespan at 25 ℃ of ETFE insulated wires is obtained, and the lifespan of insulated wires at 60 ℃ is verified. The thermal stability evaluation system and lifespan verification assessment method for ETFE insulated wires proposed in this study provide a scientific method for the quality control and standardized acceptance of high-temperature cables and have certain engineering application value in fields such as aviation equipment.

Key words

copper alloy cross-linked ETFE cable / thermogravimetic analysis / time-temperature equivalence principle / Arrhenius equation / activation energy / accelerated aging test / lifespanassessment

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ZHANG Fan, WANG Xiaojia, CHEN Yu, BIAN Zhi. Aging Characteristics and Lifespan Assessment Methods of ETFE Insulated Wires Based on Thermogravimetric Analysis[J]. Equipment Environmental Engineering. 2025, 22(11): 59-66 https://doi.org/10.7643/ issn.1672-9242.2025.11.006

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