Abstract
Electrical tree growth in the insulation material is a main factor limiting the lifespan of insulation. A new method of increasing the durability and reliability of polymer dielectrics has been proposed by designing a three-phase electrical self-healing composite. SiO2 micro and nano particles were loaded in the sample which can improve the resistance to electrical tree breakdown. Materials with hydrogen bonds were synthesized and added into epoxy matrix to make the composite self-healable. It is found that both SiO2 and hydrogen-bonding self-healing material (HSM) can inhibit the electrical trees. Besides the self-healing behavior at the macro level, the incorporation of HSM can also make the micro defects such as electrical tree channel self-healable. The electrical self-healing composite will find a wide application in the field of electronic and electrical engineering.
Highlights
Dielectric materials are the indispensable elements in microelectronics and high voltage electrical devices in insulation and packaging
The HSM labelled as D23, D34 and D45 were obtained through chemical reactions of a mixture
The labelled as D23, D34 and D45 were obtained through chemical reactions of a mixture of diacidHSM
Summary
Dielectric materials are the indispensable elements in microelectronics and high voltage electrical devices in insulation and packaging. Polymer degradation and electrical tree growth arise from the creation of intense electric fields at the tips of conducting inhomogeneity, discharge channels and sites of stress concentration [1]. The intense electric field leads to localized breakdown, creating cavities and tree channels [2] which influence the long-term degradation of the polymer dielectrics. If the growth of these electrical trees could be avoided, the lifetime and reliability of the insulation could be greatly increased. The evolution toward electronics and electrical devices with high reliability of power densities with smaller feature sizes and long lifetime places high demands on a set of material properties, especially the electrical, and self-healing properties, of polymer dielectrics
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