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Effects of electrical-hydrothermal aging degradation on dielectric and trap properties of high temperature vulcanized silicone rubber materials

机译：电水热老化降解对高温硫化硅橡胶材料介电和捕集性能的影响

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摘要

In this paper, a new aging platform combined the high voltage electric field and the hydrothermal environment was built. To investigate the aging mechanism, physicochemical, dielectric and trap properties of HTV SR before and after electrical-hydrothermal aging for 24 days were discussed. The results indicated that, compared with hydrothermal aging, more cracks and holes appeared on the surface of HTV SR after electrical-hydrothermal aging, and the content of flame retardant decreased significantly. Due to the main chain and side chain scission of PDMS, lots of low weight molecular (LWM) substances and free radicals were produced. And the tensile strength and elongation at break significantly decreased. Various physical and chemical defects appeared in the HTV SR specimen in the process of electrical-hydrothermal degradation, as a result of which, the dielectric constant significantly increased and the peak trap density increased by about 2.5 times compared to the virgin sample. The increase in trap density in turn accelerated the charge accumulation and enhanced the breakdown probability, resulting in the electric field strength decrease from 21.8 kV mm ~(?1) to 16.1 kV mm ~(?1) and severe degradation of HTV SR.
机译：本文采用了一种新的老化平台，建立了高压电场和水热环境。为了研究电热热老化前后HTV SR的老化机理，物理化学，介电和捕集性能24天。结果表明，与水热老化相比，电热热老化后HTV SR表面上出现了更多的裂缝和孔，并且阻燃剂的含量显着下降。由于PDMS的主链和侧链裂变，生产了大量低重量的分子（LWM）物质和自由基。并且断裂的拉伸强度和伸长率显着降低。在电 - 水热降解过程中，在HTV SR样本中出现各种物理和化学缺陷，结果，与原始样品相比，介电常数显着增加，峰值捕获密度增加了约2.5倍。陷阱密度的增加又加速了电荷积聚，增强了击穿概率，导致电场强度从21.8kV mm〜（α1）降至16.1kVmm〜（α1）和HTV SR的严重降解。

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