Treeing Phenomena in Epoxy/Alumina Nanocomposite and Interpretation by a Multi-core Model
Treeing Phenomena in Epoxy/Alumina Nanocomposite and Interpretation by a Multi-core Model
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DOI：
10.1541/ieejfms.126.1128
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发表时间：
2006-11
影响因子：
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通讯作者：
Toshikatsu Tanaka;A. Matsunawa;Y. Ohki;M. Kozako;M. Kohtoh;S. Okabe
中科院分区：
文献类型：
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作者：
Toshikatsu Tanaka;A. Matsunawa;Y. Ohki;M. Kozako;M. Kohtoh;S. Okabe
在实验室制备了环氧树脂/氧化铝纳米复合材料，并将其制成适合树枝实验的试件。结果表明，在环氧树脂中加入5-10wt%的纳米薄水铝石等纳米填料，可以提高树脂的树枝断裂强度。随着填料含量的增加，树枝萌发时间延长。树枝状形态在基础树脂及其纳米复合材料试件中不同。发现了一种新的交叉现象，即在交流20千伏以上(针尖处1000千伏/毫米)，纳米复合材料中的细通道比纯环氧体更快地延伸到对电极，而在交流15千伏(750千伏/毫米)以下，纳米复合材料中的细通道比纯环氧体中的慢。应该注意的是，如此细的沟渠延伸到地面并不意味着崩溃，但这种形成的树木在后来阶段变宽，导致最终崩溃。用多核模型对树枝现象进行了分析和解释，以涵盖纳米复合材料树枝现象的各种发现。
Epoxy/alumina nanocomposites were prepared in laboratory to be shaped into specimens suitable for treeing experiments. It was elucidated that treeing breakdown strength would increase, if epoxy resins were nanostructured with nano-fillers such as nano boehmite alumina fillers with their loading from 5 to 10 wt%. Tree initiation time is prolonged, as the filler content increases. Tree morphology is different between base resin and its nanocomposite specimens. A new crossover phenomenon is recognized, i.e. thin channels extend more quickly to reach the opposite electrode in nanocomposites than in pure epoxy above ac 20 kV (1000 kV/mm in the tip of the needle), while they show slower growth in nanocomposites than in pure epoxy below ac 15 kV (750 kV/mm). It should be noted that the reach of such thin channels to the grounds does not mean breakdown, but such formed trees grow in width at later stage to cause final breakdown. Treeing phenomena obtained are analyzed and interpreted by a multi-core model to cover various findings of treeing phenomena in nanocomposites.