Effect of micro-and nano-fillers on the properties of silicone rubber-alumina flexible microwave substrate

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Title:	Effect of micro-and nano-fillers on the properties of silicone rubber-alumina flexible microwave substrate
Authors:	Namitha, L.K. Chameswary, J Ananthakumar, S Sebastiann, M.T.
Keywords:	Hotpressing Composites Dielectricpropertie D.Al2O3 E.Substrates
Issue Date:	26-Feb-2013
Publisher:	Elsevier
Citation:	Ceramics International ;39(2013)7077–7087
Abstract:	Silicone rubbercompositesfilledwithmicro-andnano-aluminawerepreparedandtheeffectoffillercontentsonthemicrowave dielectric, mechanical,thermalandmoistureabsorptionpropertieswereinvestigated.Thecompositewith0.45volumefraction(Vf) of micro aluminahasarelativepermittivity(er ) of5.89anddielectricloss(tan d) of9 10–3 whereas 0.05volumefractionofnano-alumina has er of 3.52andtan d of 1.97 10–2, respectivelyat5GHz.Theexperimental er and tan d values ofsiliconerubber-micro-alumina composites werecomparedwiththatoftheoreticalmodels.AmongthetheoreticalmodelsModifiedLichteneckerandParallelmodelare in goodagreementwithexperimentalvaluesof er and tan d respectively. Thesiliconerubbernano-aluminacompositeshavebetter mechanical properties.Thecoefficientofthermalexpansion(CTE)ofcompositesdecreasedandthemoistureabsorptionincreasedwith increasing amountoffillerloading.Theimprovedpropertiesindicatethatthesiliconerubber-micro-aluminacompositeisagood candidate foraflexiblemicrowavesubstrateapplication. & 2013 ElsevierLtdandTechnaGroupS.r.l.Allrightsreserved.
URI:	http://hdl.handle.net/123456789/2465
Appears in Collections:	2013

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