The effect of both weight fraction of aluminium and frequency on dielectric properties of Al-powder reinforced polyester composite materials were investigated. We study the dielectric behaviour of composite materials reinforced with (0, 5, 15, 30 &45) weight fraction of Al and frequency ranges (50-10 6 ) Hz at room temperature. The results show the dielectric constant and dielectric losses factor were increased with increasing in weight fraction of aluminium due to high conductivity of

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... . The decrease in the dielectric constant and dielectric losses with higher frequencies can be explained by the fact that as the frequency increases, the interfacial dipoles have less time to orient themselves in the direction of the alternating field. Keyword: aluminium, polyester, dielectric and composite materials ‫اﻟﻌزل‬ ‫ﺳﻠوك‬ ‫ﻋﻠﻰ‬ ‫اﻻﻟﻣﻧﯾوم‬ ‫ﻣﺳﺣوق‬ ‫اﺿﺎﻓﺔ‬ ‫ﺗﺄﺛﯾر‬ ‫دراﺳﺔ‬ ‫اﺳﺗر‬ ‫ﻟﻠﺑوﻟﻲ‬ ‫اﻟﻛﮭرﺑﺎﺋﻲ‬ PDF created with pdfFactory Pro trial version www.pdffactory.com