Effect of Microsecond Pulsed Electric Field Strength on the BNNSs Orientation Degree and the Thermal Conductivity of Epoxy Resin Composites
Mi Yan1, Ge Xin1, Liu Lulu1,2, Gou Jiaxi1,3, Dai Jinyan1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. State Grid Zhenjiang Power Supply Company Zhenjiang 212001 China; 3. Technical Center of Chongqing Chuanyi Automation Co. Ltd Chongqing 401121 China
Abstract The pulsed electric field can induce the orientation and arrangement of the insulating and high thermal conductivity filler in the matrix, so that it forms an efficient heat conduction network in the direction of heat flow, which can improve the thermal conductivity of the composite material effectively. However, the influence rule of electric field strength is not clear. Therefore, this paper used the microsecond pulsed electric field to induce the orientation arrangement of boron nitride nanosheets (BNNSs), and investigated the effects of different pulsed electric field strengths on the BNNSs orientation degree and the thermal conductivity of composite materials. Additionally, the corresponding mechanism of the electric field strength on the BNNSs orientation degree and the thermal conductivity of the composites was analyzed based on the forces experienced by the BNNSs during curing. The results show that under the strength of 12kV/mm, the average orientation angle of BNNSs reaches 75.56°, and the thermal conductivity of the composite material is increased to 2.6 times that of pure epoxy resin. Both the BNNSs orientation degree and the thermal conductivity of composite materials increase with the increase of electric field strength, but the influence is not completely consistent. Under higher strength, the orientation of fillers tends to be saturated, but the increase in the thermal conductivity does not appear to be saturated. In general, this study is a preliminary exploration of microsecond pulse-induced filler orientation to improve the thermal conductivity of composites, and can provide guidance for the preparation of high thermal conductivity composites at low loadings.
Mi Yan,Ge Xin,Liu Lulu等. Effect of Microsecond Pulsed Electric Field Strength on the BNNSs Orientation Degree and the Thermal Conductivity of Epoxy Resin Composites[J]. Transactions of China Electrotechnical Society, 2022, 37(6): 1533-1541.
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2022, Vol. 37 
