TY - GEN
T1 - The Mechanism of DC Breakdown of EP/TiO2Nanocomposites at Elevated Temperature
AU - Li, Zhen
AU - Gao, He
AU - Liu, Ji
AU - Li, Shengtao
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - The decreased breakdown strength of epoxy composites as a function of temperature poses a possible hazard to the safe functioning of electrical and power electronic equipment and hinders the downsizing of advanced equipment. In this study, the chain dynamics and carrier transport parameters were characterized by dielectric spectrum, thermal expansion coefficients, and thermally stimulated current, and the DC breakdown mechanism of epoxy resin (EP)/TiO2 nanocomposites at temperatures ranging from 303 K to 433 K was investigated using a breakdown simulation model based on charge transport and molecular chain dynamics equations. The results reveal that the temperature-dependent breakdown strength of EP/TiO2 nanocomposites is split into two zones. 1) Below the glass transition temperature, the synergistic effects of carrier migration and segmental dynamics dominate DC breakdown. 2) In the temperature range above the glasstransition temperature: the DC breakdown is governed by the free volume expansion generated from the backbone dynamics. The breakdown strength falls drastically with increasing temperature and free volume expansion. Near glass-transition temperature, the dominant mechanism of breakdown strength changes from segmental dynamics to backbone dynamics. This work results give a theoretical foundation for the development of power electronics and electronic equipment.
AB - The decreased breakdown strength of epoxy composites as a function of temperature poses a possible hazard to the safe functioning of electrical and power electronic equipment and hinders the downsizing of advanced equipment. In this study, the chain dynamics and carrier transport parameters were characterized by dielectric spectrum, thermal expansion coefficients, and thermally stimulated current, and the DC breakdown mechanism of epoxy resin (EP)/TiO2 nanocomposites at temperatures ranging from 303 K to 433 K was investigated using a breakdown simulation model based on charge transport and molecular chain dynamics equations. The results reveal that the temperature-dependent breakdown strength of EP/TiO2 nanocomposites is split into two zones. 1) Below the glass transition temperature, the synergistic effects of carrier migration and segmental dynamics dominate DC breakdown. 2) In the temperature range above the glasstransition temperature: the DC breakdown is governed by the free volume expansion generated from the backbone dynamics. The breakdown strength falls drastically with increasing temperature and free volume expansion. Near glass-transition temperature, the dominant mechanism of breakdown strength changes from segmental dynamics to backbone dynamics. This work results give a theoretical foundation for the development of power electronics and electronic equipment.
KW - EPlTiO2 nanocomposites
KW - breakdown
KW - chain dynamics
KW - charge transport
UR - https://www.scopus.com/pages/publications/85162695487
U2 - 10.1109/ICEMPE57831.2023.10139400
DO - 10.1109/ICEMPE57831.2023.10139400
M3 - 会议稿件
AN - SCOPUS:85162695487
T3 - 2023 IEEE 4th International Conference on Electrical Materials and Power Equipment, ICEMPE 2023
BT - 2023 IEEE 4th International Conference on Electrical Materials and Power Equipment, ICEMPE 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 4th IEEE International Conference on Electrical Materials and Power Equipment, ICEMPE 2023
Y2 - 7 May 2023 through 10 May 2023
ER -