Abstract
A new method of increasing the durability and reliability of polymer dielectrics has been proposed by designing a composite structure of the micro and nano particles. The synergistic effects of the micro particles and nano particles are found to enhance the resistance to electrical tree and extend the lifetime of polymer dielectrics for insulations. Epoxy loaded with the micro and nano SiO2 particles at different concentrations are prepared as micro-nano composites. The micro particles show the blocking effects on the electrical tree channel and the interfaces of the nano particles lead to the inhibiting effects on the tree inception and propagation. The lifetime of the micro-nano composite samples in the experiments extends to 4 times of the neat epoxy. The new type of micro-nano composites can be widely applied in future electronic and electrical energy areas.
Highlights
The reliability of electrical equipment and electronic devices becomes a big issue since once the insulating materials break down, the equipment can no longer serve on line further more
It is shown in the photograph to prove the blocking effects of the micro particles because of the bigger scale than the tree channel
It can be concluded that the inhibiting effects of the nano particles are due to the large number of polymer-particle interfaces which inhibit the charges injection and movement by enhancing the interfacial polarizations and increasing the polymer active energy and the average trap depth
Summary
The reliability of electrical equipment and electronic devices becomes a big issue since once the insulating materials break down, the equipment can no longer serve on line further more. The intense electric field leads to localized breakdown, creating cavities and tree channels[6] which influence the long term degradation of the polymer dielectrics. If the growth these electrical tree could be avoided, the lifetime and reliability of the insulation could be greatly increased. The big volume of the micro particles and the large surface area of the nano particles are both found to contribute to enhancing the resistance to electrical tree. A feasible way to combine the advantages of both micro and nano particles is to design a structure which has big volume and large surface area These two features are usually contradictory for traditional particle structures. The synergistic effects of the micro and nano particles are proposed as well as the blocking effects of the micro particles and the inhibiting effects of the nano particles, which explain the high performance of the micro-nano composites for long-term electrical insulations
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