Analysis of the Electrical and Thermal Properties for Magnetic Fe3O4-Coated SiC-Filled Epoxy Composites

Polymers

卷:13

Boyang Shen¹  Yiran Zhang²  Yun Chen³  Kun Wang³  Jun Lin⁴  Jiale Wu⁴  Xupeng Song⁴  Shaojian He⁴  Yangzhi Gong⁴  Xingming Bian⁴ 

[1] Electrical Engineering Division, University of Cambridge, Cambridge CB3 0FA, UK;

[2] State Grid Maintenance Company Yichang Operation Maintenance Branch, Yichang 443000, China;

[3] State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute, Co., Ltd., Beijing 102211, China;

[4] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;

关键词: magnetization treatment;    orderly arrangement;    breakdown strength;    dielectric properties;    thermal conductivity;    silicon carbide;   

DOI  :  10.3390/polym13183028

来源: DOAJ

【 摘 要 】

Orderly arranged Silicon carbide (SiC)/epoxy (EP) composites were fabricated. SiC was made magnetically responsive by decorating the surface with iron oxide (Fe₃O₄) nanoparticles. Three treatment methods, including without magnetization, pre-magnetization and curing magnetization, were used to prepare SiC/EP composites with different filler distributions. Compared with unmodified SiC, magnetic SiC with core-shell structure was conducive to improve the breakdown strength of SiC/EP composites and the maximum enhancement rate was 20.86%. Among the three treatment methods, SiC/EP composites prepared in the curing-magnetization case had better comprehensive properties. Under the action of magnetic field, magnetic SiC were orderly oriented along the direction of an external field, thereby forming SiC chains. The magnetic alignment of SiC restricted the movement of EP macromolecules or polar groups to some extent, resulting in the decrease in the dielectric constant and dielectric loss. The SiC chains are equivalent to heat flow channels, which can improve the heat transfer efficiency, and the maximum improvement rate was 23.6%. The results prove that the orderly arrangement of SiC had a favorable effect on dielectric properties and thermal conductivity of SiC/EP composites. For future applications, the orderly arranged SiC/EP composites have potential for fabricating insulation materials in the power electronic device packaging field.

【 授权许可】

Unknown