High orientation degree of graphene nanoplatelets in silicon nitride composites prepared by spark plasma sintering

Tapasztó, Orsolya and Tapasztó, Levente and Lemmel, Hartmut and Puchy, Victor and Dusza, Jan and Balázsi, Csaba and Balázsi, Katalin (2016) High orientation degree of graphene nanoplatelets in silicon nitride composites prepared by spark plasma sintering. CERAMICS INTERNATIONAL, 42 (1). pp. 1002-1006. ISSN 0272-8842

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Abstract

Abstract The sinteringprocessofceramiccompositesisknowntosignificantly alterthedistributionofthenanoscale fillers withinthematrix.Graphene nanoplatelets reinforcedceramiccompositessinteredunderuniaxialpressureconditions(e.g.,sparkplasmasintering,hotpressing)display anisotropic mechanical,electricalandthermalproperties.Thisanisotropycanbeattributedtothepreferentialalignmentofthegraphene nanoplatelets perpendiculartothedirectionoftheuniaxialpressure.Here,weprovideadetailedstructuralcharacterizationofthegraphene nanoplatelet distributionbyscanningelectronmicroscopyandultra-smallangleneutronsscatteringinvestigationsofsparkplasmasinteredSi3N4/ graphene nanoplateltscomposites.Toquantifytheeffect,wecompareour findings forsamplessinteredbythesparkplasmasinteringwith uniaxial pressure(SPS)tothesamecompositesinteredbyhotisostaticpressingemployingisotropicpressure(HIP).WefoundthatforSPS sintered compositesmorethan80%ofthegraphenenanoplatelets(GNPs)areorientedwithin 7151 of thedominantorientationdirection,in striking contrasttotherandomlyorientatedGNPsfoundinthesamplessinteredbyHIP.Theseresultscancontributetothequantitative understanding ofthevariousanisotropicphysicalpropertiesreportedinGNPreinforcedcompositespreparedbymethodsemployinguniaxial pressure. & 2015 ElsevierLtdandTechnaGroupS.r.l.Allrightsreserved.

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