Electrical Treeing Breakdown Characteristics of Epoxy/Spherical Boron Nitride with Card‐House Structure Composites

Abstract

A spherical boron nitride with a card‐house structure (sBNch) was developed to enhance the filler's thermal property. To develop a thermal conductive insulating composite material with higher thermal conductive and acceptable electrical breakdown strength, an epoxy (EP)/an sBNch composite was produced. The treeing breakdown voltage of the composite using a needle‐rod electrode and the thermal conductivity were measured. The treeing breakdown voltage of EP/sBNch composite with the sBNch content of 50 wt% was higher than that of EP without the sBNch. The protrusion on the surface of the sBNch increases the effective distance between the electrodes. The thermal conductivity of EP/sBNch composite with the sBNch content of 50 wt% was higher than that of EP. From these results, the sBNch is considered a strong candidate filler of a thermally conductive composite. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

Enhanced Anticarbonization and Electrical Performance of Epoxy Resin via Densified Spherical Boron Nitride Networks

“…The electrical tree can only “bypass” the inorganic fillers, which makes a longer breakdown path. Therefore, hindering or extending the development of the electrical trees is an essential factor affecting the breakdown strength of composite materials. , …”

“…Therefore, hindering or extending the development of the electrical trees is an essential factor affecting the breakdown strength of composite materials. 29,30 Surface potential decay is widely used to analyze charge migration in polymers. 31 The experiment on surface charge dissipation uses the needle-plate electrode corona discharge.…”