本文關(guān)鍵詞： 納米復(fù)合聚合物 聚乙烯 Zeta電位 空間電荷 電導(dǎo)　出處：《哈爾濱理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：納米復(fù)合絕緣材料具有優(yōu)良的空間電荷抑制能力和較高的直流擊穿強(qiáng)度,可以應(yīng)用于高壓直流電纜的制造。但納米復(fù)合材料改善介電性能的機(jī)理至今仍不清楚。研究者們提出了若干模型用來(lái)解釋納米電介質(zhì)的介電性能變化,普遍的共識(shí)是納米復(fù)合材料中存在著大量界面域,界面域中可能具有荷電層進(jìn)而影響復(fù)合介質(zhì)的宏觀(guān)電性能。但至今仍無(wú)直接的實(shí)驗(yàn)證據(jù)來(lái)證實(shí)納米復(fù)合介質(zhì)中存在界面荷電層。本論文通過(guò)對(duì)比不同種類(lèi)納米顆粒分散在液體石蠟中的Zeta電位,測(cè)試了不同納米填料的Zeta電位值。實(shí)驗(yàn)發(fā)現(xiàn),不同填料的Zeta電位值與其制備的復(fù)合介質(zhì)的直流電導(dǎo)率呈現(xiàn)負(fù)相關(guān)。應(yīng)用Zeta電位值較高的納米填料所制備的納米復(fù)合介質(zhì)具有更低的電導(dǎo)率。應(yīng)用靜電力顯微鏡,對(duì)比測(cè)試了納米復(fù)合材料的遠(yuǎn)程相圖。研究納米復(fù)合材料的局域電荷行為,并探究了無(wú)機(jī)納米顆粒在固態(tài)復(fù)合材料中的界面行為。實(shí)驗(yàn)發(fā)現(xiàn),SiO2/LDPE和SiC/LDPE出現(xiàn)了明顯的界面荷電分布,這兩種納米復(fù)合介質(zhì)可以更好的抑制空間電荷。同時(shí)兩種填料的Zeta電位絕對(duì)值也高于其他填料,這從一個(gè)側(cè)面說(shuō)明了Zeta電位和靜電力顯微鏡測(cè)試是互相印證的。而具有明顯界面荷電層的納米復(fù)合介質(zhì)具有更好的空間電荷抑制能力和更低的直流電導(dǎo)率。
[Abstract]:Nano-composite insulating materials have excellent space charge suppression ability and high DC breakdown strength. It can be used in the manufacture of HVDC cables, but the mechanism of improving dielectric properties of nanocomposites is still unclear. Researchers have proposed several models to explain the dielectric properties of nanocrystalline dielectrics. It is generally agreed that there are a large number of interfacial domains in nanocomposites. There may be a charge layer in the interface domain, which may affect the macroscopic electrical properties of the composite medium. However, there is no direct experimental evidence to confirm the existence of the interface charge layer in the nanocomposite medium. In this paper, we compare different kinds of nanocrystalline particles. The Zeta potential of particles dispersed in liquid paraffin. The Zeta potential of different nano-fillers was measured. The Zeta potential of different fillers is negatively correlated with the DC conductivity of the composite media prepared by different fillers, and the nano-composite media prepared with higher Zeta potential value has lower conductivity. Electrostatic microscope. The remote phase diagram of nanocomposites was tested, the local charge behavior of nanocomposites was studied, and the interface behavior of inorganic nanoparticles in solid-state composites was investigated. The interface charge distribution between SiO2/LDPE and SiC/LDPE is obvious. These two nano-composite media can better inhibit the space charge. At the same time, the absolute value of Zeta potential of the two fillers is higher than that of other fillers. This shows that the Zeta potential and the hydrostatic microscope test are mutually consistent, while the nano-composite medium with obvious interface charge layer has better space charge suppression ability and lower DC conductivity. .
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：O631.23;TB383.1

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相關(guān)期刊論文 前10條

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本文編號(hào)：1446726