Wyniki wyszukiwania - BazTech

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The influence of barium titanate bati03 as a filler in impregnating epoxy resin on chosen electrical parameters of obtained material.

Kasprzak W., Nadolny Z., Walczak K., Siodła K., Sikorski W., Józwiak K., Paścik G., Moron L.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2007

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Vol. 46, nr 19

165-170

EN

The paper describes the influence of barium titanate BaTiO3 used as a filler in impregnating epoxy resin on electrical parameters of obtained material. The results of computer simulation of electric filed intensity distribution in area of 220 kV AC composite insulator show, that in order to reduce the maximal value of this field it is necessary to use the rod with the highest possible permittivity. It was assumed that the increase of rod permittivity is possible by doping the epoxy resin, being one of glass-epoxy rod components, with a filler having high permittivity value. Barium titanate BaTi03 in micro- and nanograms was chosen as the filler. Presumably, such a change in material structure, may negatively influence other electrical parameters of obtained material, important in composite insulators construction. In order to check the filler dispersion in epoxy matrix, microscopical observations of obtained materials fractions were performed. In wide range of frequency, the permittivity and volume resistivity of obtained materials in were determined. The inception voltage of partial discharges on surface of materials was determined with electric, acoustic and antenna methods.

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Space charge at ldpe-clay composite interfaces.

Motyl E., Krause T., Żyłka P., Moron L.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2007

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Vol. 46, nr 19

86-90

EN

The space charge accumulation and decay at LDPE/(LDPE-MMT nanofiller composite) interfaces was investigated using the step electroacoustic (SEA) method. A three-layered specimen was polarized under dc voltage at 90 deg. C. After cooling under field, the short-circuit currents as well as SEA signals were measured during TS discharging of the sample. The MMT nanofillers affect the electrical properties, particularly conductivity of composites significantly and play an important role In charge distribution. LDPE/LDPE-MMT interfaces act as carrier traps and favors accumulation of charges at highr temperatures.

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Polarization spectra analysis for the investigation of space charge in dielectric nanocomposites

Mazurek B., Moron L.

Materials Science Poland

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2007

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Vol. 25, No. 3

899--911

EN

The aim of the study was to examine the influence of the dimension of matrix-filler interface on properties of epoxy nanocomposites. Using traditional investigation methods: dielectric spectroscopy, transient currents and thermally stimulated depolarization, as well as measurements of space charge distribution by the electroacoustic method, it was possible to evaluate the types of polarization and capability of accumulation and decay of space charge. The measurements performed made it possible to compare properties of a nanocomposite, microcomposite and pure resin. It was confirmed that the size of interface area plays a crucial role in the phenomena occurring in composites under the influence of electric fields.