Electrical and thermal performances of epoxy-based micro-nano hybrid composites at different electric fields and temperatures

Chao Dai; Xiangrong Chen; Qilong Wang; Muhammad Awais; Guangyu Zhu; Yiwen Shi; Ashish Paramane; Yasuhiro Tanaka

doi:10.1088/1361-6528/abf7ec

Electrical and thermal performances of epoxy-based micro-nano hybrid composites at different electric fields and temperatures

Nanotechnology. 2021 May 14;32(31). doi: 10.1088/1361-6528/abf7ec.

Authors

Chao Dai¹, Xiangrong Chen^{1

2}, Qilong Wang¹, Muhammad Awais¹, Guangyu Zhu¹, Yiwen Shi¹, Ashish Paramane³, Yasuhiro Tanaka⁴

Affiliations

¹ Zhejiang Provincial Key Laboratory of Electrical Machine Systems, College of Electrical Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
² Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, Zhejiang 311200, People's Republic of China.
³ Electrical Engineering Department, National Institute of Technology, Silchar, Assam 788010, India.
⁴ Measurement and Electric Machine Control Laboratory, Tokyo City University, Tamazutsumi, Setagaya 158-8557, Tokyo, Japan.

PMID: 33853051
DOI: 10.1088/1361-6528/abf7ec

Abstract

This paper investigates the electrical and thermal properties of pure epoxy resin (EP) and its micro-nano hybrid composites (20 wt% micro-AlN fillers with 1 wt% and 3 wt% nano-Al₂O₃fillers; 50% micro-AlN with 3% nano-Al₂O₃fillers) for power electronic packaging applications. Electrical properties such as space charge distribution, electrical conductivity and surface potential decay are measured. The thermal performance of the fabricated samples is estimated using thermal analysis devices. The hybrid composite consisting of 20 wt% micro-AlN and 1 wt% nano-Al₂O₃fillers exhibits the least space charge accumulation, higher thermal conductivity and better thermal stability. However, the excessive addition adversely affects space charge and electrical conductivity properties. The micro-nano hybrid composites significantly exhibit higher electrical conductivity than pure EP. The microfiller addition from 20 wt% to 50 wt% significantly improves the thermal conductivity of the EP. The reduced space charge injection and accumulation in the hybrid micro-nano composites are attributed to the enhancement of the injection barrier and reduction of the charge carrier traps in these materials. A theoretical mechanism of the charge dynamics inside the samples under different test conditions is proposed to support the experimental results.

Keywords: electrical and thermal performances; epoxy hybrid composites; packaging material; space charge characteristics.