低溫環(huán)境用樹脂基非線性復(fù)合材料研究
[Abstract]:When the cable is operated under the electric field, due to the influence of the non-uniform electric field, the surface and deep layer of dielectric material will be charged, and the electrons will accumulate in the dielectric material with high resistivity, which is difficult to release, which seriously affects the normal operation of the cable. In this paper, a new type of resin matrix nonlinear composites was developed. Zinc oxide and carbon black treated by silane coupling agent were added to epoxy resin matrix, and the properties of the samples were tested at room temperature and liquid nitrogen environment. At first, the feasible formula of resin was put forward. Secondly, the preparation process of resin-based nonlinear composites was studied, and the optimum design of the preparation process of resin-based nonlinear composites was determined. Finally, the curing mould of resin matrix nonlinear composites was designed according to different experimental requirements, and the test samples were prepared according to the curing process. The results show that the conductivity of the composites is linear in normal temperature and liquid nitrogen environment, and almost does not change with the field strength. The change of conductivity with field strength in liquid nitrogen environment is not as obvious as that at normal temperature, and the increase of inorganic filler concentration is beneficial to the occurrence of conductivity nonlinearity when the electric field intensity is small. The lightning shock test shows that the breakdown field strength of carbon black / epoxy resin composites decreases with the increase of carbon black content, decreases to a certain extent, and finally tends to stabilize. The breakdown voltage of ZnO / epoxy composite does not change with the increase of ZnO content. The power frequency breakdown test shows that the breakdown field strength of carbon black / epoxy resin decreases with the increase of carbon black content, and the breakdown field strength of zinc oxide / epoxy resin increases with the increase of the content of zinc oxide / epoxy resin. The mechanical properties in liquid nitrogen environment were better than those in normal temperature, and the tensile strength and elastic modulus of resin matrix composites were maintained at a constant value.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM21
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