TY - GEN
T1 - Thermocycling Ageing of EP/Al2O3Micron Composites
T2 - 4th IEEE International Conference on Electrical Materials and Power Equipment, ICEMPE 2023
AU - An, Dongxu
AU - Sui, Haoran
AU - Gao, Jian
AU - Zha, Xiaopeng
AU - Yang, Kai
AU - Zhou, Fusheng
AU - Wu, Kangning
AU - Li, Jianying
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - This paper studied thermocycling ageing phenomenon of EP/Al2O3 micron composites that are used as cable terminal insulation. EP/Al2O3 micron composites were prepared and thermocycling ageing tests were conducted. Microscopic changes and ageing dielectric characteristics of different ageing periods were tested. The results of scanning electron microscope (SEM) indicated that, during the thermocycling ageing, the matrix-filler interface was in a continuous stretched state under the effect of elevated temperature and alternating temperature stresses, resulting in weakening of the interfacial bond and deterioration of epoxy crosslinking network. Holes and microcracks appeared on the fracture surface of the samples, and the free volume increased. The microstructure of the samples showed obvious deterioration, which can be further supported by the dielectric and traps characteristics and lower AC breakdown strength (Eb). A 15 % decrease in Eb and a 40 % decrease in deep trap density were found after the ageing of 750 h. The trap distribution results also indicated that the ageing process was delayed by post-curing reaction of epoxy.
AB - This paper studied thermocycling ageing phenomenon of EP/Al2O3 micron composites that are used as cable terminal insulation. EP/Al2O3 micron composites were prepared and thermocycling ageing tests were conducted. Microscopic changes and ageing dielectric characteristics of different ageing periods were tested. The results of scanning electron microscope (SEM) indicated that, during the thermocycling ageing, the matrix-filler interface was in a continuous stretched state under the effect of elevated temperature and alternating temperature stresses, resulting in weakening of the interfacial bond and deterioration of epoxy crosslinking network. Holes and microcracks appeared on the fracture surface of the samples, and the free volume increased. The microstructure of the samples showed obvious deterioration, which can be further supported by the dielectric and traps characteristics and lower AC breakdown strength (Eb). A 15 % decrease in Eb and a 40 % decrease in deep trap density were found after the ageing of 750 h. The trap distribution results also indicated that the ageing process was delayed by post-curing reaction of epoxy.
KW - dielectric characteristics
KW - epoxy
KW - micron composite
KW - microscopic morphology
KW - thermocycling ageing
UR - https://www.scopus.com/pages/publications/85162716845
U2 - 10.1109/ICEMPE57831.2023.10139421
DO - 10.1109/ICEMPE57831.2023.10139421
M3 - 会议稿件
AN - SCOPUS:85162716845
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.
Y2 - 7 May 2023 through 10 May 2023
ER -