超细碳氮化钛基金属陶瓷的微波烧结工艺与性能

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1、万方数据ABSTRACTBecauseoftheirhighhardness，excellentwearresistance，red-hardness，thennaIconductivity’chemicalstabilityandbondresisitanceability，TiCNmatrixce珊etsareconsideredasanextremelypotentialcuttingmaterial．Inthispaper’theultra-6neTiCNpowderswerepr印aredbyballmillingmethod．Thesizedistributiono

2、fTiCNparticlesmilledfordif．ferenttimeswastestedandtheef诧ctofball-powdersratioandmillingtimeontheaVerageparticlesizeofTiCNpowderswasa11alyzed．Ultra-fineTiCNmatrixcemetsreforcedbynano-paniclewerepfeparedbyamicrowavesintering．Theef＆ctofsinteringtemperature，holdingtime狮dtheadditionofnanoparticle

3、onthemicrostructureandmechanicalpropeniesofultra-fineTiCNmatrixcemetswerestudied．Simultaneously'boththemicrogr叩hsofTiCNpowdersandthemicrostructufesanddistributionofelementsoffracturesurfaceofultra-fineTiCNmatrixcemetsandtheirnanocompositece咖etswereobserVedandinVestigatedbyscanningelectronmic

4、roscope(SEM)withEDS．Theresultsareshownasf．oUows：1．Theultra·fineTiCNpowderswereef{bctivelypreparedbybanmilling．Withtheincreasingofball-powdersratioandmillingtime，theaverageparticlesizereducesfirstandtllenrises，andwhenmilledfor50hwithball·powdersratioof8：1，theultrafinespheroidalpowdersofTiCNwi

5、ththeaVeragesizeof0．84IImcanbeobtained．2．Ultra·fineTiCNmatrixcemetswerepreparedbyamicrowaVesintering．Withtheincreasingofsinteringtemperature，theshrinkagerate，relatiVedensity，bendingstrengthandhardnessofthecemetsallrisefirstandthenreduce．Andtheultra—fineTiCNmatrixcemetssinteredat1500℃for30min

6、utesshowssmallgrains，homogeneousmicrostructures，andexcellentpropertieswith1547MPaofbendingstrengthand90．6HRAofhardness，whichareincreased24．0％and0．7％，respectiVely，comparedwiththatofthecermetspreparedbyconVentionsintering．3．Withtheincreasingofsinteringtemperature，theshrinkagerate，relativedensi

7、ty'bendingstrengthandhardnessofthece瑚etsref．orcedbynano．A1203allrise万方数据ABSTRACTfirstandthenreduce，themaximalValueappearedwhenthetemperatureisl500℃，andthesuitablemicrowaVetechn0109yis1500℃for30min．Inthisexperiment，也eadditionofnano-A1203reducestheme