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Browsing by Subject "Ceramic matrix composites"

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    Enhancing the properties of yttria-stabilized zirconia composites with zeolitic imidazolate framework-derived nanocarbons
    (American Chemical Society, 2023-12-09) Cakan, N.; Issa, A. A.; Alsalman, H.; Aliyev, Emin; Duden, E. I.; Gurcan Bayrak, K.; Caglar, M.; Turan, S.; Erkartal, M.
    Ceramicmatrixcomposites(CMCs)reinforcedwithnanocarbonhaveattractedsignificantinterestdue to theirpotentialto enhancemechanical,thermal,andelectricalproperties.Althoughthe investigationof carbon-basedmaterialssuchas grapheneandcarbonnanotubesas additivesfor advancedceramicshasbeenwidespread,theutilizationof metal−organicframework(MOF)-derivednanocarbonsin CMCsremainslargelyunexplored.We extendedour previousproof-of-conceptinvestigationsby demonstratingthe effectivenessofa differenttypeof MOF-derivedcarbonas a reinforcingphasein an alternativeceramicmatrix.We employedsparkplasmasintering(SPS)to consolidateyttria-stabilizedzirconia(YSZ)andzeoliticimidazolateframework(ZIF-67)powderblendsat 1300°C and a uniaxialpressureof 50 MPa.YSZservesas the ceramicmatrix,whereasZIF-67servesas the nanocarbonsource.Thecompositeexhibitsa highlysignificantimprovementin fracturetoughnesswithan increaseof up to13%comparedto thatof the YSZmonolith.Theformationof ZIF-derivednanocarboninterlayersis responsiblefor the observedenhancementin ductility,whichcan be attributedto theirabilityto facilitateenergydissipationduringcrackpropagationand inhibitgraingrowth.Furthermore,the room-temperatureelectricalconductivityof the sinteredsamplesdemonstratesa substantialimprovement,primarilydue to the in situ formationof nanocarbon-basedfillers,reachingan impressive27 S/mwith10 wt % ZIF-67content.Basedon the results,it can be inferredthatthe incorporationof in situ MOF-derivednanocarbonsintoCMCsleadsto asubstantialimprovementin boththe mechanicaland electricalproperties.

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