资源描述：
《钙稳定氧化锆陶瓷的制备及其导电性能研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、AbstractAbstractCalciastabilizedzirconia(CSZ)ceramicshavebeenwidelyusedinoxygensensors,oxygenpumpsandhightemperatureheatgeneratorduetotheirrelativelyhighionicconductivity,lowheatconductivity,hightemperaturechemicalstability,andoutstandingthermalshockresistance.Inthiswork,usingzirconiaan
2、dcalciumnitrateasrawmaterials,aseriesofCSZceramicswerepreparedviapressurelesssinteringmethod,andtestedtherelativedensitiesandopenporosityofthesinteredsamples.TheparticlesizeofCSZpowderwasanalyzed.PhasetransformationwascharacterizedbyXRDandRamanspectroscopy;microstructurewasrepresentedby
3、SEM;electricalpropertywastestedbyACimpedancetechnology.Inaddition,theeffectofCaOadditiveamount,sinteringtemperature,phases,andmicrostructureontheelectricalpropertiesarediscussedemphatically.Theresultsareasfollowing.Thesinteredsampleshavehighrelativedensity.WiththeincreaseofCaOadditiveam
4、ount,therelativedensityfirstlyincreaseandthendecrease.Elevatingthesinteringtemperature,theopenporositydeclines.ThemainphasesofsinteredsamplesiscubicZrO2(c-ZrO2)andtetragonalZrO2(t-ZrO2).Asmallamountofmonocliniczirconia(m-ZrO2)ispresentinafewofsamples.Byincreasingeitherthesinteringtemper
5、atureorCaOadditiveamount,thephasesgraduallyturnfromc-ZrO2,t-ZrO2andm-ZrO2intoc-ZrO2andt-ZrO2,finallyonlyc-ZrO2left.GrainboundarywasclearinthesectionofCSZceramics,andgrainsizeisrelativelyuniform.ThemainfracturemodeofCSZceramicsisintergranularfracture.TheionicconductivityofCSZceramicsisde
6、terminedbytheconcentrationandmobilityofoxygenvacancies.VaryingtheCaOadditiveamount,the5.0wt%sinteredsamplesisfoundtoownthehighestionicconductivity,inwhichtheconcentrationofoxygenvacanciesstayatanappropriatelevel.Thesinteringtemperaturealsoaffectstheconductivityviachangingthephasesandgra
7、in.TheconductivityisrelatedtothephaseratiosofCSZceramics;andtheratiosofc-ZrO2andt-ZrO2shouldrangeinanappropriateregion.Smallanduniformgrain,aswellaslargerquantitiesofgrainIII万方数据硕士学位论文boundary,contributetooxygenvacancytransferandbetterconductivityofCSZceramicsasaresult.Ascalcul
