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1、J.Am.Ceram.Soc.,91[6]1888–1897(2008)DOI:10.1111/j.1551-2916.2008.02350.xr2008TheAmericanCeramicSocietyJournalMechanismofAlumina-EnhancedSinteringofFineZirconiaPowder:InfluenceofAluminaConcentrationontheInitialStageSinteringwKojiMatsuiTokyoResearchLaboratory,TosohCorporation,Kanagawa252-1123,Japan
2、TakanoriYamakawa,MasatoUehara,NaoyaEnomoto,andJunichiHojo*DepartmentofAppliedChemistry,FacultyofEngineering,KyushuUniversity,Fukuoka819-0395,JapanTheisothermalshrinkagebehaviorof2.9mol%Y2O3-dopedderivedthesintering-rateequationthatcanquantitativelyanalyzeZrO2powderswith0–1mass%Al2O3wasinvestigate
3、dtoclar-densificationattheinitialsinteringstagebyconstantratesifytheeffectofAl2O3concentrationontheinitialsinteringofheating(CRH)measurement,andreportedthattheinitialstage.TheshrinkageofthepowdercompactwasmeasuredatsinteringstageofY-TZPpowderwasexplainedbyagrain-constanttemperaturesintherangeof950
4、1–10501C.TheAl2O3boundarydiffusion(GBD)mechanism.WangandRaj2,3alsoadditionincreasedthedensificationratewithincreasingtemper-derivedthesintering-rateequationapplicableforthequantita-ature.Thevaluesofapparentactivationenergy(nQ)andap-tiveanalysisofshrinkagedatameasuredbytheCRHtechnique,parentfrequen
5、cy-factorterm(bn),wherenistheorder0andestimatedtheactivationenergyattheintermediatesinteringdependingonthediffusionmechanism,wereestimatedatthestageofZrO2(withY2O3)andAl2O3/ZrO2(withY2O3)com-initialsinteringstagebyapplyingasintering-rateequationtoposites.Inthepreviouspapers,theauthorskineticallya
6、nalyzedtheisothermalshrinkagedata.Thediffusionmechanismchan-theinitialsinteringbehaviorofY-TZPpowderswithandwith-gedfromgrain-boundarydiffusion(GBD)tovolumediffusionoutca.0.25mass%Al2O3,andreportedthattheadditionof(VD)byAlOadditionandbothnQandbnincreasedwithin-230Al2O3changesthediffusionmechanism
7、fromGBDtovolumecreasingAl2O3concentration.Thekineticanalysisofthesinte-diffusion(VD)attheinitialsinteringstageandatthisAl2O3ringmechanismsuggestedthattheincreaseofdensificationrateconcentration,thedensificationisenhanced
