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Influence of nanoparticle surface coating on electrical conductivity of LDPE/Al2O3 nanocomposites for HVDC cable insulations

Dongming Liu ; Anh Hoang (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Amir Pourrahimi ; Love Pallon ; Fritjof Nilsson ; Stanislaw Gubanski (Institutionen för material- och tillverkningsteknik, Högspänningsteknik) ; Richard Olsson ; Mikael Hedenqvist ; Ulf Gedde
IEEE transactions on dielectrics and electrical insulation (1070-9878). Vol. 24 (2017), 3, p. 1396-1404.
[Artikel, refereegranskad vetenskaplig]

LDPE/metal oxide nanocomposites are promising materials for future high-voltage DC cable insulation. The surface coating of the nanoparticles is a key step to achieve well-balanced properties. This paper presents data on the influence of the structure of the nanoparticle coating on the electrical conductivity of LDPE/Al2O3 nanocomposites. Al2O3 nanoparticles, 50 nm in size, were coated with a series of silanes with terminal alkyl groups of different lengths (methyl, octyl and octadecyl groups). The density of the coatings in vacuum was between 200 and 515 kg m-3, indicating a porous nature on the nanoparticle surface. The dispersion of the nanoparticles in the LDPE matrix was assessed based on statistics for the nearest-neighbour particle distance. The electrical conductivity of the nanocomposites was determined at 40 and 60 °C. The results show that an appropriate surface coating on the nanoparticles maintained uniform particle dispersion up to a filler loading of 10 wt.%, with a maximum reduction in the electrical conductivity by a factor of 35. Large particle agglomerates were found to increase the electrical conductivity of the nanocomposites. The composites based on the highly porous octyl-coated nanoparticles showed the greatest reduction in electrical conductivity and the lowest temperature coefficient of electrical conductivity of the composites studied.

Nyckelord: HVDC cable insulation, LDPE/aluminum oxide nanocomposites, particle coating chemistry, particle dispersion, electrical conductivity

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Denna post skapades 2017-06-15. Senast ändrad 2017-10-03.
CPL Pubid: 249885


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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Högspänningsteknik (2005-2017)


Elektroteknik och elektronik

Chalmers infrastruktur