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Effect of micro-Si3N4–nano-Al2O3 co-filled particles on thermal conductivity, dielectric and mechanical properties of silicone rubber composites

Effect of micro-Si3N4–nano-Al2O3 co-filled particles on thermal conductivity, dielectric and mechanical properties of silicone rubber composites
Effect of micro-Si3N4–nano-Al2O3 co-filled particles on thermal conductivity, dielectric and mechanical properties of silicone rubber composites
Silicone rubber (SR) is widely used on the distribution and transmission lines of power systems owing to its excellent insulating properties, extraordinary hydrophobicity and high tensile strength. However, the thermal conductivity of pure silicone rubber is very low which restricts its application for long time due to heat formation under electric field. This research focuses on the effect of micro- and nano-sized filler mixture on thermal conductivity, dielectric and mechanical properties of the SR composites. The micro-Si3N4 and nano-Al2O3 cofilled SR composites (MNCSR) with different volume ratios of Si3N4 and Al2O3 were fabricated by simple blending and subsequently hotmolding technique. With the addition of micro-Si3N4¿¿nano-Al2O3 mixture at 30 vol. % (Si3N4/Al2O3=26/4), the composites showed high thermal conductivity of ~ 1.6 W m-1 k-1, low relative dielectric permittivity of ~ 5.3 and high breakdown strength of ~ 85 MV/m. Meanwhile, the introduction of micro-nano-sized particles resulted in improved elongation at beak and tensile strength. Besides, the MNCSR composites demonstrated good hydrophobicity with the static contact angle over 110°. The combination of these outstanding performances makes the MNCSR composites attractive in the field of insulating materials.
1989-1996
Zha, Junwei
988918c3-b4c6-4722-8dff-935625954b09
Dang, Zhimin
6ff3e294-e350-408d-8a69-1b0018876ffa
Li, Weikang
20f823d2-ea1f-4c12-b120-5550b02eefc4
Zhu, Yanhui
2e23ecf1-f2fe-421f-a833-6d91f7660e1d
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zha, Junwei
988918c3-b4c6-4722-8dff-935625954b09
Dang, Zhimin
6ff3e294-e350-408d-8a69-1b0018876ffa
Li, Weikang
20f823d2-ea1f-4c12-b120-5550b02eefc4
Zhu, Yanhui
2e23ecf1-f2fe-421f-a833-6d91f7660e1d
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Zha, Junwei, Dang, Zhimin, Li, Weikang, Zhu, Yanhui and Chen, George (2014) Effect of micro-Si3N4–nano-Al2O3 co-filled particles on thermal conductivity, dielectric and mechanical properties of silicone rubber composites. IEEE Transactions on Dielectrics & Electrical Insulation, 21 (4), 1989-1996. (doi:10.1109/TDEI.2014.004330).

Record type: Article

Abstract

Silicone rubber (SR) is widely used on the distribution and transmission lines of power systems owing to its excellent insulating properties, extraordinary hydrophobicity and high tensile strength. However, the thermal conductivity of pure silicone rubber is very low which restricts its application for long time due to heat formation under electric field. This research focuses on the effect of micro- and nano-sized filler mixture on thermal conductivity, dielectric and mechanical properties of the SR composites. The micro-Si3N4 and nano-Al2O3 cofilled SR composites (MNCSR) with different volume ratios of Si3N4 and Al2O3 were fabricated by simple blending and subsequently hotmolding technique. With the addition of micro-Si3N4¿¿nano-Al2O3 mixture at 30 vol. % (Si3N4/Al2O3=26/4), the composites showed high thermal conductivity of ~ 1.6 W m-1 k-1, low relative dielectric permittivity of ~ 5.3 and high breakdown strength of ~ 85 MV/m. Meanwhile, the introduction of micro-nano-sized particles resulted in improved elongation at beak and tensile strength. Besides, the MNCSR composites demonstrated good hydrophobicity with the static contact angle over 110°. The combination of these outstanding performances makes the MNCSR composites attractive in the field of insulating materials.

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Accepted/In Press date: 3 July 2014
Published date: August 2014
Organisations: EEE

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Local EPrints ID: 368828
URI: http://eprints.soton.ac.uk/id/eprint/368828
PURE UUID: c1b9ea01-9753-44f5-b1fa-5c4f6ce6898a

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Date deposited: 13 Sep 2014 09:35
Last modified: 16 Dec 2019 20:23

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