Volcanic ash as flux in clay based triaxial ceramic materials, effect of the firing temperature in phases and mechanical properties

MARIA FLORENCIA SERRA; MARÍA SUSANA CONCONI; G. SUAREZ; E.F. AGLIETTI; N. RENDTORFF

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 41 p. 6169 - 6177

0272-8842

The studyofpossibleincorporationofnontraditionalstartingpowdersisacontributiontotherationalutilizationofrawmaterialsintheceramicindustry. Thetechnologicalpropertiesofsolidwasteproblems(bothurbanandindustrial)inmanycasesarenotcorrectlystudiedandreported.The mainobjectiveofthepresentworkistostudyanddemonstratetheapplicabilityofthevolcanicashforthefabricationofclaybasedceramicmaterials asthe flux fractionforreplacingfeldspar.Thispaperdealswithaparticularrawmaterial(volcanicash)buttheresultscanbeextendedto materialsresultingfromsimilarsourcesandproperties.Themilledvolcanicashwascharacterizedandemployedasa flux agentreplacingfeldspar inamodeltriaxialceramicmaterial(clay?quartz?flux) formulation.Previously,thevolcanicashwascharacterized.DifferentialThermalAnalysis andtermogravimetry(DTA?TG) inordertoestablishthe firing conditionswerealsocarriedout.Afterwards,thethermaltreatments(900?1300 1C) conditionswerestudied:the firing temperatureswerecorrelatedwiththeshrinkage?porosity?density evolution.The crystallinephasethermalevolutionwasalsoestablishedandcomparedtotheoneobservedinthemodelfeldsparbasedmaterial.Finallythe mechanicalpropertiesoftheobtainedmaterials(flexural strengthanddynamicelasticmodulus)wereevaluated.Theresultspermittedtocorroborate theapplicabilityandestablishsomeofthetechnologicalpropertiesofashbasedceramicmaterial.