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1、材料学外文资料翻译DCresistivityofaluminaandzirconiasinteredwithTiCCentralGlassandCeramicResearchInstituteKolkata700032,IndiaCollegeofCeramicTechnologyKolkata700010,IndiaMSreceived20October2003;revised11February2005Abstract:PurealuminaandzirconiapowdersweresinteredseparatelywithincreasingamountofTiCupto65vol.
2、%,asaconductingsecondphasewithanaimtoprepareconductingstructuralceramicswhichcanbepreciselymachinedbyEDMtechnique.TiCdidnothelpinsinteringtheparentphasebutitdecreasedthed.c.resistivityofthecompositeto1ohm.cmat30vol.%loading.Theconductivityisexplainedbytheeffectivemediaandpercolationtheories.Keywords
3、.Alumina;zirconia;titaniumcarbide;composite;electricalconductivity;electricalresistivity1.introductionAttemptshavebeenmadeindifferentdirectionstoimprovethemechanicalpropertiesofthestructuralceramics.Promisingamongthemisasecondphasereinforcementintheparentmatrix.Theceramicsofsuperiormechanicalpropert
4、iesinturngiverisetotimeconsumingfinishingprocesseswhicharequiteexpensive.Asasolutiontothisproblem,anewertechniqueoffinishingthecomponentsatafasterrateandatarelativelyreducedcostviz.electrodischargemachining(EDM)techniquehasbeenappliedinsomecases.Thetechniqueessentiallyneedsthecomponentstobeelectrica
5、llyconducting(resistance5%,avg.particlesize,5mm,IndianAluminiumCo.,Kolkata),pureZrO2(99.9%,avg.particlesize,10mm,IndianRareEarthsLtd.,Thiruvananthapuram)andTiC(99.0%,avg.particlesize,16mm,H.C.Starck,Goslar,Germany)weretakenforpreparationofthecomposites.Eachcomposition(table1)wasmixedinpureisopropyla
6、lcoholfor3h.Thepelletsof18mmdiameterweredrypresseduniaxiallyat300MPaandsinteredat160Cinpureargoninagraphiteresistanceheatedfurnacefor1030,90and180min.Bulkdensityofthesinteredpelletsweremeasuredbywaterdisplacementmethod.X-raydiffractographofthesamplesweretakentodetectthemajorphasesandtoknowiftherewasanyreaction.Thesampleswithlowporositywerepolishedprogressivelywith60mm,10mm,6mm,3mmand1mm
